Behavior and Applications of Ionized Gases: MCQ Set for Liberty
University
(Including Fusion Energy Research and Mathematical Problems)
1. What is the primary characteristic of an ionized gas?
a) It contains only neutral atoms
b) It contains a significant number of charged particles
c) It is always solid
d) It has no electrical conductivity
Answer: b) It contains a significant number of charged particles
2. Which of the following is another term for ionized gas?
a) Plasma
b) Vapor
c) Condensate
d) Supercritical fluid
Answer: a) Plasma
3. In a typical fusion reactor, what is the approximate temperature required to achieve fusion?
a) 1,000°C
b) 100,000°C
c) 15,000,000°C
d) 1,000,000,000°C
Answer: c) 15,000,000°C
4. Which of the following is NOT a method of plasma confinement used in fusion research?
a) Magnetic confinement
b) Inertial confinement
c) Gravitational confinement
d) Electrostatic confinement
Answer: c) Gravitational confinement
5. What is the Debye length in a plasma?
a) The average distance between ions
b) The distance over which electric fields are screened
c) The mean free path of electrons
d) The radius of the plasma container
Answer: b) The distance over which electric fields are screened
6. If the Debye length in a plasma is 0.1 mm and the electron temperature is 10 eV, what is the
approximate electron density? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-₀
23 J/K)
a) 10^15 m^-3
b) 10^17 m^-3
c) 10^19 m^-3
d) 10^21 m^-3
Answer: c) 10^19 m^-3
7. Which of the following is a common application of plasma in industry?
a) Food preservation
b) Etching in semiconductor manufacturing
c) Water purification
d) Oil refining
Answer: b) Etching in semiconductor manufacturing
8. What is the primary fuel used in most current fusion reactor designs?
a) Uranium-235
b) Plutonium-239
c) Deuterium and Tritium
d) Helium-3
Answer: c) Deuterium and Tritium
9. Which of the following is NOT a characteristic of plasma?
a) Collective behavior
b) Quasi-neutrality
c) Debye shielding
d) Incompressibility
Answer: d) Incompressibility
10. In a fully ionized hydrogen plasma, what is the ratio of electrons to ions?
a) 1:1
b) 2:1
c) 1:2
d) Depends on the temperature
Answer: a) 1:1
11. What is the primary mechanism of energy loss in a fusion plasma?
a) Bremsstrahlung radiation
b) Synchrotron radiation
c) Conduction
d) Convection
Answer: a) Bremsstrahlung radiation
12. Which of the following fusion reactions has the highest cross-section at achievable
temperatures?
a) D + D
b) D + T
c) D + He-3
d) p + B-11
Answer: b) D + T
13. What is the Lawson criterion in fusion research?
a) A measure of plasma purity
b) A condition for plasma ignition
c) A limit on plasma temperature
d) A measure of fusion efficiency
Answer: b) A condition for plasma ignition
14. If the fusion triple product nTτ is 10^21 m^-3 · keV · s, and the density n is 10^20 m^-3, what
is the confinement time τ if the temperature T is 10 keV?
a) 0.1 s
b) 1 s
c) 10 s
d) 100 s
Answer: b) 1 s
15. Which of the following is NOT a type of plasma instability?
a) Kink instability
b) Sausage instability
c) Rayleigh-Taylor instability
d) Coulomb instability
Answer: d) Coulomb instability
16. What is the primary purpose of a divertor in a tokamak fusion reactor?
a) To heat the plasma
b) To remove impurities and helium ash
c) To generate electricity
d) To inject fuel
Answer: b) To remove impurities and helium ash
17. In plasma physics, what does MHD stand for?
a) Magneto-Hydro Dynamics
b) Multi-Harmonic Discharge
c) Micro-Hall Device
d) Magnetic Heat Diffusion
Answer: a) Magneto-Hydro Dynamics
18. What is the typical electron temperature in a laboratory glow discharge plasma?
a) 0.1 eV
b) 1 eV
c) 10 eV
d) 100 eV
Answer: b) 1 eV
19. Which of the following is NOT a plasma diagnostic technique?
a) Langmuir probe
b) Thomson scattering
c) Magnetic resonance imaging
d) Spectroscopy
Answer: c) Magnetic resonance imaging
20. What is the cyclotron frequency of an electron in a magnetic field of 1 Tesla? (Use e = 1.6 ×
10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 17.6 MHz
b) 176 MHz
c) 1.76 GHz
d) 17.6 GHz
Answer: d) 17.6 GHz
21. Which of the following is a common application of non-thermal plasmas?
a) Fusion energy production
b) Plasma display panels
c) Plasma cutting
d) Plasma propulsion in space
Answer: b) Plasma display panels
22. What is the primary mechanism for plasma formation in a lightning strike?
a) Photoionization
b) Electron impact ionization
c) Thermal ionization
d) Surface ionization
Answer: b) Electron impact ionization
23. In a plasma with electron density n_e = 10^18 m^-3 and temperature T_e = 100 eV, what is
the Debye length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 7.4 × 10^-6 m
b) 7.4 × 10^-5 m
c) 7.4 × 10^-4 m
d) 7.4 × 10^-3 m
Answer: b) 7.4 × 10^-5 m
24. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
25. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Hall effect thruster
b) Magnetoplasmadynamic thruster
c) Pulsed plasma thruster
d) Fission fragment thruster
Answer: d) Fission fragment thruster
26. What is the primary difference between fusion and fission reactions?
a) Fusion releases more energy per reaction
b) Fission produces less radioactive waste
c) Fusion requires lighter elements
d) Fission occurs spontaneously in nature
Answer: c) Fusion requires lighter elements
27. In a tokamak, what is the purpose of the toroidal field coils?
a) To heat the plasma
b) To confine the plasma
c) To drive current in the plasma
d) To measure plasma parameters
Answer: b) To confine the plasma
28. What is the typical ionization fraction in a weakly ionized plasma?
a) Less than 1%
b) 10-50%
c) 50-90%
d) Greater than 99%
Answer: a) Less than 1%
29. Which of the following is NOT a method of plasma heating in fusion devices?
a) Ohmic heating
b) Neutral beam injection
c) Radio frequency heating
d) Gravitational heating
Answer: d) Gravitational heating
30. What is the primary challenge in achieving sustained nuclear fusion for energy production?
a) Fuel availability
b) Plasma confinement
c) Neutron activation
d) Waste disposal
Answer: b) Plasma confinement
31. In a plasma with equal electron and ion temperatures, what is the ratio of electron to ion
thermal velocities? (Assume singly ionized hydrogen)
a) 1:1
b) √(m_i/m_e):1
c) m_i/m_e:1
d) 1:√(m_i/m_e)
Answer: b) √(m_i/m_e):1
32. What is the primary purpose of the bootstrap current in a tokamak?
a) To heat the plasma
b) To drive plasma rotation
c) To sustain the plasma current
d) To control plasma instabilities
Answer: c) To sustain the plasma current
33. Which of the following is NOT a common plasma processing technique in the semiconductor
industry?
a) Plasma etching
b) Plasma-enhanced chemical vapor deposition
c) Plasma immersion ion implantation
d) Plasma chromatography
Answer: d) Plasma chromatography
34. What is the primary advantage of inertial confinement fusion over magnetic confinement
fusion?
a) Higher energy gain
b) Simpler reactor design
c) Lower fuel requirements
d) Continuous operation
Answer: b) Simpler reactor design
35. In a plasma with electron temperature T_e = 10 eV, what is the most probable speed of
electrons? (Use m_e = 9.1 × 10^-31 kg, k = 1.38 × 10^-23 J/K)
a) 1.3 × 10^6 m/s
b) 1.9 × 10^6 m/s
c) 2.6 × 10^6 m/s
d) 3.2 × 10^6 m/s
Answer: b) 1.9 × 10^6 m/s
36. What is the primary function of a scrape-off layer in a tokamak?
a) To heat the plasma
b) To control plasma instabilities
c) To protect the reactor walls
d) To generate fusion reactions
Answer: c) To protect the reactor walls
37. Which of the following is NOT a type of plasma waves?
a) Alfvén waves
b) Ion acoustic waves
c) Langmuir waves
d) Gravitational waves
Answer: d) Gravitational waves
38. What is the primary advantage of using deuterium as a fusion fuel compared to normal
hydrogen?
a) Higher fusion cross-section
b) Lower ignition temperature
c) Easier to extract from water
d) Produces less neutron radiation
Answer: a) Higher fusion cross-section
39. In a plasma with density n = 10^20 m^-3 and temperature T = 10 keV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 28 GHz
b) 56 GHz
c) 89 GHz
d) 112 GHz
Answer: c) 89 GHz
40. Which of the following is NOT a method of plasma diagnostics?
a) Langmuir probe
b) Interferometry
c) Mass spectrometry
d) X-ray crystallography
Answer: d) X-ray crystallography
41. What is the primary purpose of a magnetic mirror in plasma confinement?
a) To reflect plasma particles
b) To heat the plasma
c) To measure magnetic fields
d) To generate fusion reactions
Answer: a) To reflect plasma particles
42. Which of the following is NOT a type of plasma sheath?
a) Debye sheath
b) Magnetic sheath
c) Child-Langmuir sheath
d) Bohm sheath
Answer: b) Magnetic sheath
43. What is the primary advantage of using superconducting magnets in fusion reactors?
a) Higher magnetic fields
b) Lower power consumption
c) Easier maintenance
d) Better plasma stability
Answer: b) Lower power consumption
44. In a plasma with electron temperature T_e = 100 eV and ion temperature T_i = 10 eV, what
is the ratio of electron to ion thermal velocities? (Assume singly ionized hydrogen)
a) 1:1
b) √10:1
c) 10:1
d) √(1836/10):1
Answer: d) √(1836/10):1
45. Which of the following is NOT a type of plasma torch?
a) DC plasma torch
b) RF plasma torch
c) Microwave plasma torch
d) Gamma-ray plasma torch
Answer: d) Gamma-ray plasma torch
46. What is the primary purpose of a pellet injector in a fusion reactor?
a) To fuel the plasma
b) To cool the plasma
c) To measure plasma density
d) To remove impurities
Answer: a) To fuel the plasma
47. Which of the following is NOT a common application of atmospheric pressure plasmas?
a) Surface treatment
b) Sterilization
c) Waste treatment
d) Nuclear fusion
Answer: d) Nuclear fusion
48. What is the primary advantage of stellarators over tokamaks in fusion research?
a) Higher plasma density
b) Lower construction cost
c) Potential for steady-state operation
d) Higher fusion reaction rate
Answer: c) Potential for steady-state operation
49. In a plasma with density n = 10^19 m^-3 and magnetic field B = 5 T, what is the electron
cyclotron frequency? (Use e = 1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 44 GHz
b) 88 GHz
c) 140 GHz
d) 176 GHz
Answer: c) 140 GHz
50. Which of the following is NOT a method of plasma surface modification?
a) Plasma nitriding
b) Plasma carburizing
c) Plasma oxidation
d) Plasma fission
Answer: d) Plasma fission
51. What is the primary purpose of a limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
52. Which of the following is NOT a type of plasma instability in fusion devices?
a) Kink instability
b) Ballooning instability
c) Tearing mode
d) Coulomb instability
Answer: d) Coulomb instability
53. What is the primary advantage of using helium-3 as a fusion fuel?
a) Higher fusion cross-section
b) Lower ignition temperature
c) Aneutronic fusion reactions
d) Easier to extract from natural resources
Answer: c
54. In a plasma with electron temperature T_e = 5 keV, what is the Bohm velocity? (Assume
singly ionized hydrogen, m_i = 1.67 × 10^-27 kg)
a) 3.1 × 10^4 m/s
b) 4.9 × 10^4 m/s
c) 6.9 × 10^4 m/s
d) 9.8 × 10^4 m/s
Answer: c) 6.9 × 10^4 m/s
55. Which of the following is NOT a type of plasma deposition technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma spray coating
c) Plasma electrolysis deposition
d) Plasma-assisted molecular beam epitaxy
Answer: c) Plasma electrolysis deposition
56. What is the primary purpose of a magnetic nozzle in plasma propulsion?
a) To accelerate the plasma
b) To cool the plasma
c) To measure plasma velocity
d) To generate fusion reactions
Answer: a) To accelerate the plasma
57. Which of the following is NOT a common plasma sterilization mechanism?
a) UV radiation
b) Reactive species
c) Heat
d) X-ray emission
Answer: d) X-ray emission
58. What is the primary advantage of using negative ion beams for neutral beam injection in
fusion reactors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
59. In a plasma with density n = 10^20 m^-3 and temperature T = 15 keV, what is the Debye
length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 2.9 × 10^-5 m
b) 5.8 × 10^-5 m
c) 8.7 × 10^-5 m
d) 1.2 × 10^-4 m
Answer: b) 5.8 × 10^-5 m
60. Which of the following is NOT a type of plasma accelerator?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma wakefield accelerator
d) Plasma centrifugal accelerator
Answer: d) Plasma centrifugal accelerator
61. What is the primary purpose of electron cyclotron resonance heating in fusion devices?
a) To heat ions directly
b) To heat electrons directly
c) To drive plasma current
d) To control plasma instabilities
Answer: b) To heat electrons directly
62. Which of the following is NOT a common application of low-temperature plasmas?
a) Plasma TVs
b) Fluorescent lamps
c) Plasma-assisted combustion
d) Plasma fusion reactors
Answer: d) Plasma fusion reactors
63. What is the primary advantage of using lithium as a first wall material in fusion reactors?
a) High melting point
b) Low atomic number
c) High thermal conductivity
d) Neutron multiplication
Answer: b) Low atomic number
64. In a plasma with magnetic field B = 2 T, what is the Larmor radius of a proton with kinetic
energy 10 keV? (Use m_p = 1.67 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 1.6 cm
b) 3.2 cm
c) 4.8 cm
d) 6.4 cm
Answer: b) 3.2 cm
65. Which of the following is NOT a type of plasma etching process?
a) Reactive ion etching
b) Sputter etching
c) Deep reactive ion etching
d) Plasma arc etching
Answer: d) Plasma arc etching
66. What is the primary purpose of a plasma antenna?
a) To generate plasma
b) To heat plasma
c) To transmit and receive radio waves
d) To measure plasma density
Answer: c) To transmit and receive radio waves
67. Which of the following is NOT a type of plasma spectroscopy technique?
a) Optical emission spectroscopy
b) Laser-induced breakdown spectroscopy
c) X-ray photoelectron spectroscopy
d) Plasma chromatography spectroscopy
Answer: d) Plasma chromatography spectroscopy
68. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
69. In a plasma with electron temperature T_e = 20 eV, what is the electron thermal velocity?
(Use m_e = 9.1 × 10^-31 kg)
a) 1.9 × 10^6 m/s
b) 2.7 × 10^6 m/s
c) 3.8 × 10^6 m/s
d) 5.4 × 10^6 m/s
Answer: b) 2.7 × 10^6 m/s
70. Which of the following is NOT a type of plasma confinement scheme?
a) Magnetic confinement
b) Inertial confinement
c) Electrostatic confinement
d) Gravitational confinement
Answer: d) Gravitational confinement
71. What is the primary purpose of a plasma focus device?
a) To generate X-rays and neutrons
b) To heat fusion plasmas
c) To measure plasma density
d) To control plasma instabilities
Answer: a) To generate X-rays and neutrons
72. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Gridded ion thruster
b) Hall effect thruster
c) Magnetoplasmadynamic thruster
d) Plasma combustion thruster
Answer: d) Plasma combustion thruster
73. What is the primary advantage of using radio frequency heating in fusion plasmas?
a) Lower equipment cost
b) Higher heating efficiency
c) Better plasma stability
d) More localized power deposition
Answer: d) More localized power deposition
74. In a plasma with density n = 10^18 m^-3 and temperature T = 5 eV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 2.8 GHz
b) 5.6 GHz
c) 8.9 GHz
d) 11.2 GHz
Answer: a) 2.8 GHz
75. Which of the following is NOT a type of plasma discharge?
a) Glow discharge
b) Corona discharge
c) Arc discharge
d) Quantum discharge
Answer: d) Quantum discharge
76. What is the primary purpose of a magnetic beach in plasma heating?
a) To reflect plasma waves
b) To absorb plasma waves
c) To generate plasma waves
d) To measure plasma waves
Answer: b) To absorb plasma waves
77. Which of the following is NOT a common application of thermal plasmas?
a) Plasma cutting
b) Plasma spraying
c) Waste treatment
d) Plasma displays
Answer: d) Plasma displays
78. What is the primary advantage of using negative ion sources in neutral beam injectors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
79. In a plasma with magnetic field B = 3 T, what is the electron cyclotron frequency? (Use e =
1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 52.8 GHz
b) 84.0 GHz
c) 105.6 GHz
d) 126.8 GHz
Answer: b) 84.0 GHz
80. Which of the following is NOT a type of plasma diagnostics technique?
a) Langmuir probe
b) Thomson scattering
c) Reflectometry
d) Plasma chromatography
Answer: d) Plasma chromatography
81. What is the primary purpose of a plasma actuator in aerodynamics?
a) To generate thrust
b) To control boundary layer
c) To measure air speed
d) To heat the airflow
Answer: b) To control boundary layer
82. Which of the following is NOT a type of plasma instability in space plasmas?
a) Two-stream instability
b) Firehose instability
c) Weibel instability
d) Plasma condensation instability
Answer: d) Plasma condensation instability
83. What is the primary advantage of using alpha particle heating in fusion reactors?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) Self-sustaining fusion reactions
Answer: d) Self-sustaining fusion reactions
84. In a plasma with ion temperature T_i = 10 keV, what is the most probable speed of
deuterium ions? (Use m_D = 3.34 × 10^-27 kg)
a) 4.9 × 10^5 m/s
b) 6.9 × 10^5 m/s
c) 9.8 × 10^5 m/s
d) 1.4 × 10^6 m/s
Answer: b) 6.9 × 10^5 m/s
85. Which of the following is NOT a type of plasma-based water treatment method?
a) Plasma oxidation
b) Plasma electrolysis
c) Plasma cavitation
d) Plasma distillation
Answer: d) Plasma distillation
86. What is the primary purpose of a plasma limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
87. Which of the following is NOT a type of plasma-based propulsion system?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma sail
d) Plasma combustion engine
Answer: d) Plasma combustion engine
88. What is the primary advantage of using electron cyclotron current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: d) More localized current generation
89. In a plasma with electron density n_e = 10^20 m^-3 and temperature T_e = 10 keV, what is
the electron plasma beta? (Use B = 5 T, μ = 4π × 10^-7 H/m)₀
a) 0.8%
b) 1.6%
c) 3.2%
d) 6.4%
Answer: c) 3.2%
90. Which of the following is NOT a type of plasma-based materials synthesis technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma polymerization
c) Plasma electrolysis
d) Plasma spray pyrolysis
Answer: c) Plasma electrolysis
91. What is the primary purpose of a plasma window?
a) To separate vacuum from atmosphere
b) To heat the plasma
c) To measure plasma density
d) To generate fusion reactions
Answer: a) To separate vacuum from atmosphere
54. In a plasma with electron temperature T_e = 5 keV, what is the Bohm velocity? (Assume
singly ionized hydrogen, m_i = 1.67 × 10^-27 kg)
a) 3.1 × 10^4 m/s
b) 4.9 × 10^4 m/s
c) 6.9 × 10^4 m/s
d) 9.8 × 10^4 m/s
Answer: c) 6.9 × 10^4 m/s
55. Which of the following is NOT a type of plasma deposition technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma spray coating
c) Plasma electrolysis deposition
d) Plasma-assisted molecular beam epitaxy
Answer: c) Plasma electrolysis deposition
56. What is the primary purpose of a magnetic nozzle in plasma propulsion?
a) To accelerate the plasma
b) To cool the plasma
c) To measure plasma velocity
d) To generate fusion reactions
Answer: a) To accelerate the plasma
57. Which of the following is NOT a common plasma sterilization mechanism?
a) UV radiation
b) Reactive species
c) Heat
d) X-ray emission
Answer: d) X-ray emission
58. What is the primary advantage of using negative ion beams for neutral beam injection in
fusion reactors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
59. In a plasma with density n = 10^20 m^-3 and temperature T = 15 keV, what is the Debye
length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 2.9 × 10^-5 m
b) 5.8 × 10^-5 m
c) 8.7 × 10^-5 m
d) 1.2 × 10^-4 m
Answer: b) 5.8 × 10^-5 m
60. Which of the following is NOT a type of plasma accelerator?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma wakefield accelerator
d) Plasma centrifugal accelerator
Answer: d) Plasma centrifugal accelerator
61. What is the primary purpose of electron cyclotron resonance heating in fusion devices?
a) To heat ions directly
b) To heat electrons directly
c) To drive plasma current
d) To control plasma instabilities
Answer: b) To heat electrons directly
62. Which of the following is NOT a common application of low-temperature plasmas?
a) Plasma TVs
b) Fluorescent lamps
c) Plasma-assisted combustion
d) Plasma fusion reactors
Answer: d) Plasma fusion reactors
63. What is the primary advantage of using lithium as a first wall material in fusion reactors?
a) High melting point
b) Low atomic number
c) High thermal conductivity
d) Neutron multiplication
Answer: b) Low atomic number
64. In a plasma with magnetic field B = 2 T, what is the Larmor radius of a proton with kinetic
energy 10 keV? (Use m_p = 1.67 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 1.6 cm
b) 3.2 cm
c) 4.8 cm
d) 6.4 cm
Answer: b) 3.2 cm
65. Which of the following is NOT a type of plasma etching process?
a) Reactive ion etching
b) Sputter etching
c) Deep reactive ion etching
d) Plasma arc etching
Answer: d) Plasma arc etching
66. What is the primary purpose of a plasma antenna?
a) To generate plasma
b) To heat plasma
c) To transmit and receive radio waves
d) To measure plasma density
Answer: c) To transmit and receive radio waves
67. Which of the following is NOT a type of plasma spectroscopy technique?
a) Optical emission spectroscopy
b) Laser-induced breakdown spectroscopy
c) X-ray photoelectron spectroscopy
d) Plasma chromatography spectroscopy
Answer: d) Plasma chromatography spectroscopy
68. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
69. In a plasma with electron temperature T_e = 20 eV, what is the electron thermal velocity?
(Use m_e = 9.1 × 10^-31 kg)
a) 1.9 × 10^6 m/s
b) 2.7 × 10^6 m/s
c) 3.8 × 10^6 m/s
d) 5.4 × 10^6 m/s
Answer: b) 2.7 × 10^6 m/s
70. Which of the following is NOT a type of plasma confinement scheme?
a) Magnetic confinement
b) Inertial confinement
c) Electrostatic confinement
d) Gravitational confinement
Answer: d) Gravitational confinement
71. What is the primary purpose of a plasma focus device?
a) To generate X-rays and neutrons
b) To heat fusion plasmas
c) To measure plasma density
d) To control plasma instabilities
Answer: a) To generate X-rays and neutrons
72. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Gridded ion thruster
b) Hall effect thruster
c) Magnetoplasmadynamic thruster
d) Plasma combustion thruster
Answer: d) Plasma combustion thruster
73. What is the primary advantage of using radio frequency heating in fusion plasmas?
a) Lower equipment cost
b) Higher heating efficiency
c) Better plasma stability
d) More localized power deposition
Answer: d) More localized power deposition
74. In a plasma with density n = 10^18 m^-3 and temperature T = 5 eV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 2.8 GHz
b) 5.6 GHz
c) 8.9 GHz
d) 11.2 GHz
Answer: a) 2.8 GHz
75. Which of the following is NOT a type of plasma discharge?
a) Glow discharge
b) Corona discharge
c) Arc discharge
d) Quantum discharge
Answer: d) Quantum discharge
76. What is the primary purpose of a magnetic beach in plasma heating?
a) To reflect plasma waves
b) To absorb plasma waves
c) To generate plasma waves
d) To measure plasma waves
Answer: b) To absorb plasma waves
77. Which of the following is NOT a common application of thermal plasmas?
a) Plasma cutting
b) Plasma spraying
c) Waste treatment
d) Plasma displays
Answer: d) Plasma displays
78. What is the primary advantage of using negative ion sources in neutral beam injectors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
79. In a plasma with magnetic field B = 3 T, what is the electron cyclotron frequency? (Use e =
1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 52.8 GHz
b) 84.0 GHz
c) 105.6 GHz
d) 126.8 GHz
Answer: b) 84.0 GHz
80. Which of the following is NOT a type of plasma diagnostics technique?
a) Langmuir probe
b) Thomson scattering
c) Reflectometry
d) Plasma chromatography
Answer: d) Plasma chromatography
81. What is the primary purpose of a plasma actuator in aerodynamics?
a) To generate thrust
b) To control boundary layer
c) To measure air speed
d) To heat the airflow
Answer: b) To control boundary layer
82. Which of the following is NOT a type of plasma instability in space plasmas?
a) Two-stream instability
b) Firehose instability
c) Weibel instability
d) Plasma condensation instability
Answer: d) Plasma condensation instability
83. What is the primary advantage of using alpha particle heating in fusion reactors?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) Self-sustaining fusion reactions
Answer: d) Self-sustaining fusion reactions
84. In a plasma with ion temperature T_i = 10 keV, what is the most probable speed of
deuterium ions? (Use m_D = 3.34 × 10^-27 kg)
a) 4.9 × 10^5 m/s
b) 6.9 × 10^5 m/s
c) 9.8 × 10^5 m/s
d) 1.4 × 10^6 m/s
Answer: b) 6.9 × 10^5 m/s
85. Which of the following is NOT a type of plasma-based water treatment method?
a) Plasma oxidation
b) Plasma electrolysis
c) Plasma cavitation
d) Plasma distillation
Answer: d) Plasma distillation
86. What is the primary purpose of a plasma limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
87. Which of the following is NOT a type of plasma-based propulsion system?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma sail
d) Plasma combustion engine
Answer: d) Plasma combustion engine
88. What is the primary advantage of using electron cyclotron current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: d) More localized current generation
89. In a plasma with electron density n_e = 10^20 m^-3 and temperature T_e = 10 keV, what is
the electron plasma beta? (Use B = 5 T, μ = 4π × 10^-7 H/m)₀
a) 0.8%
b) 1.6%
c) 3.2%
d) 6.4%
Answer: c) 3.2%
90. Which of the following is NOT a type of plasma-based materials synthesis technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma polymerization
c) Plasma electrolysis
d) Plasma spray pyrolysis
Answer: c) Plasma electrolysis
91. What is the primary purpose of a plasma window?
a) To separate vacuum from atmosphere
b) To heat the plasma
c) To measure plasma density
d) To generate fusion reactions
Answer: a) To separate vacuum from atmosphere
54. In a plasma with electron temperature T_e = 5 keV, what is the Bohm velocity? (Assume
singly ionized hydrogen, m_i = 1.67 × 10^-27 kg)
a) 3.1 × 10^4 m/s
b) 4.9 × 10^4 m/s
c) 6.9 × 10^4 m/s
d) 9.8 × 10^4 m/s
Answer: c) 6.9 × 10^4 m/s
55. Which of the following is NOT a type of plasma deposition technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma spray coating
c) Plasma electrolysis deposition
d) Plasma-assisted molecular beam epitaxy
Answer: c) Plasma electrolysis deposition
56. What is the primary purpose of a magnetic nozzle in plasma propulsion?
a) To accelerate the plasma
b) To cool the plasma
c) To measure plasma velocity
d) To generate fusion reactions
Answer: a) To accelerate the plasma
57. Which of the following is NOT a common plasma sterilization mechanism?
a) UV radiation
b) Reactive species
c) Heat
d) X-ray emission
Answer: d) X-ray emission
58. What is the primary advantage of using negative ion beams for neutral beam injection in
fusion reactors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
59. In a plasma with density n = 10^20 m^-3 and temperature T = 15 keV, what is the Debye
length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 2.9 × 10^-5 m
b) 5.8 × 10^-5 m
c) 8.7 × 10^-5 m
d) 1.2 × 10^-4 m
Answer: b) 5.8 × 10^-5 m
60. Which of the following is NOT a type of plasma accelerator?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma wakefield accelerator
d) Plasma centrifugal accelerator
Answer: d) Plasma centrifugal accelerator
61. What is the primary purpose of electron cyclotron resonance heating in fusion devices?
a) To heat ions directly
b) To heat electrons directly
c) To drive plasma current
d) To control plasma instabilities
Answer: b) To heat electrons directly
62. Which of the following is NOT a common application of low-temperature plasmas?
a) Plasma TVs
b) Fluorescent lamps
c) Plasma-assisted combustion
d) Plasma fusion reactors
Answer: d) Plasma fusion reactors
63. What is the primary advantage of using lithium as a first wall material in fusion reactors?
a) High melting point
b) Low atomic number
c) High thermal conductivity
d) Neutron multiplication
Answer: b) Low atomic number
64. In a plasma with magnetic field B = 2 T, what is the Larmor radius of a proton with kinetic
energy 10 keV? (Use m_p = 1.67 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 1.6 cm
b) 3.2 cm
c) 4.8 cm
d) 6.4 cm
Answer: b) 3.2 cm
65. Which of the following is NOT a type of plasma etching process?
a) Reactive ion etching
b) Sputter etching
c) Deep reactive ion etching
d) Plasma arc etching
Answer: d) Plasma arc etching
66. What is the primary purpose of a plasma antenna?
a) To generate plasma
b) To heat plasma
c) To transmit and receive radio waves
d) To measure plasma density
Answer: c) To transmit and receive radio waves
67. Which of the following is NOT a type of plasma spectroscopy technique?
a) Optical emission spectroscopy
b) Laser-induced breakdown spectroscopy
c) X-ray photoelectron spectroscopy
d) Plasma chromatography spectroscopy
Answer: d) Plasma chromatography spectroscopy
68. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
69. In a plasma with electron temperature T_e = 20 eV, what is the electron thermal velocity?
(Use m_e = 9.1 × 10^-31 kg)
a) 1.9 × 10^6 m/s
b) 2.7 × 10^6 m/s
c) 3.8 × 10^6 m/s
d) 5.4 × 10^6 m/s
Answer: b) 2.7 × 10^6 m/s
70. Which of the following is NOT a type of plasma confinement scheme?
a) Magnetic confinement
b) Inertial confinement
c) Electrostatic confinement
d) Gravitational confinement
Answer: d) Gravitational confinement
71. What is the primary purpose of a plasma focus device?
a) To generate X-rays and neutrons
b) To heat fusion plasmas
c) To measure plasma density
d) To control plasma instabilities
Answer: a) To generate X-rays and neutrons
72. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Gridded ion thruster
b) Hall effect thruster
c) Magnetoplasmadynamic thruster
d) Plasma combustion thruster
Answer: d) Plasma combustion thruster
73. What is the primary advantage of using radio frequency heating in fusion plasmas?
a) Lower equipment cost
b) Higher heating efficiency
c) Better plasma stability
d) More localized power deposition
Answer: d) More localized power deposition
74. In a plasma with density n = 10^18 m^-3 and temperature T = 5 eV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 2.8 GHz
b) 5.6 GHz
c) 8.9 GHz
d) 11.2 GHz
Answer: a) 2.8 GHz
75. Which of the following is NOT a type of plasma discharge?
a) Glow discharge
b) Corona discharge
c) Arc discharge
d) Quantum discharge
Answer: d) Quantum discharge
76. What is the primary purpose of a magnetic beach in plasma heating?
a) To reflect plasma waves
b) To absorb plasma waves
c) To generate plasma waves
d) To measure plasma waves
Answer: b) To absorb plasma waves
77. Which of the following is NOT a common application of thermal plasmas?
a) Plasma cutting
b) Plasma spraying
c) Waste treatment
d) Plasma displays
Answer: d) Plasma displays
78. What is the primary advantage of using negative ion sources in neutral beam injectors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
79. In a plasma with magnetic field B = 3 T, what is the electron cyclotron frequency? (Use e =
1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 52.8 GHz
b) 84.0 GHz
c) 105.6 GHz
d) 126.8 GHz
Answer: b) 84.0 GHz
80. Which of the following is NOT a type of plasma diagnostics technique?
a) Langmuir probe
b) Thomson scattering
c) Reflectometry
d) Plasma chromatography
Answer: d) Plasma chromatography
81. What is the primary purpose of a plasma actuator in aerodynamics?
a) To generate thrust
b) To control boundary layer
c) To measure air speed
d) To heat the airflow
Answer: b) To control boundary layer
82. Which of the following is NOT a type of plasma instability in space plasmas?
a) Two-stream instability
b) Firehose instability
c) Weibel instability
d) Plasma condensation instability
Answer: d) Plasma condensation instability
83. What is the primary advantage of using alpha particle heating in fusion reactors?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) Self-sustaining fusion reactions
Answer: d) Self-sustaining fusion reactions
84. In a plasma with ion temperature T_i = 10 keV, what is the most probable speed of
deuterium ions? (Use m_D = 3.34 × 10^-27 kg)
a) 4.9 × 10^5 m/s
b) 6.9 × 10^5 m/s
c) 9.8 × 10^5 m/s
d) 1.4 × 10^6 m/s
Answer: b) 6.9 × 10^5 m/s
85. Which of the following is NOT a type of plasma-based water treatment method?
a) Plasma oxidation
b) Plasma electrolysis
c) Plasma cavitation
d) Plasma distillation
Answer: d) Plasma distillation
86. What is the primary purpose of a plasma limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
87. Which of the following is NOT a type of plasma-based propulsion system?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma sail
d) Plasma combustion engine
Answer: d) Plasma combustion engine
88. What is the primary advantage of using electron cyclotron current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: d) More localized current generation
89. In a plasma with electron density n_e = 10^20 m^-3 and temperature T_e = 10 keV, what is
the electron plasma beta? (Use B = 5 T, μ = 4π × 10^-7 H/m)₀
a) 0.8%
b) 1.6%
c) 3.2%
d) 6.4%
Answer: c) 3.2%
90. Which of the following is NOT a type of plasma-based materials synthesis technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma polymerization
c) Plasma electrolysis
d) Plasma spray pyrolysis
Answer: c) Plasma electrolysis
91. What is the primary purpose of a plasma window?
a) To separate vacuum from atmosphere
b) To heat the plasma
c) To measure plasma density
d) To generate fusion reactions
Answer: a) To separate vacuum from atmosphere
54. In a plasma with electron temperature T_e = 5 keV, what is the Bohm velocity? (Assume
singly ionized hydrogen, m_i = 1.67 × 10^-27 kg)
a) 3.1 × 10^4 m/s
b) 4.9 × 10^4 m/s
c) 6.9 × 10^4 m/s
d) 9.8 × 10^4 m/s
Answer: c) 6.9 × 10^4 m/s
55. Which of the following is NOT a type of plasma deposition technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma spray coating
c) Plasma electrolysis deposition
d) Plasma-assisted molecular beam epitaxy
Answer: c) Plasma electrolysis deposition
56. What is the primary purpose of a magnetic nozzle in plasma propulsion?
a) To accelerate the plasma
b) To cool the plasma
c) To measure plasma velocity
d) To generate fusion reactions
Answer: a) To accelerate the plasma
57. Which of the following is NOT a common plasma sterilization mechanism?
a) UV radiation
b) Reactive species
c) Heat
d) X-ray emission
Answer: d) X-ray emission
58. What is the primary advantage of using negative ion beams for neutral beam injection in
fusion reactors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
59. In a plasma with density n = 10^20 m^-3 and temperature T = 15 keV, what is the Debye
length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 2.9 × 10^-5 m
b) 5.8 × 10^-5 m
c) 8.7 × 10^-5 m
d) 1.2 × 10^-4 m
Answer: b) 5.8 × 10^-5 m
60. Which of the following is NOT a type of plasma accelerator?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma wakefield accelerator
d) Plasma centrifugal accelerator
Answer: d) Plasma centrifugal accelerator
61. What is the primary purpose of electron cyclotron resonance heating in fusion devices?
a) To heat ions directly
b) To heat electrons directly
c) To drive plasma current
d) To control plasma instabilities
Answer: b) To heat electrons directly
62. Which of the following is NOT a common application of low-temperature plasmas?
a) Plasma TVs
b) Fluorescent lamps
c) Plasma-assisted combustion
d) Plasma fusion reactors
Answer: d) Plasma fusion reactors
63. What is the primary advantage of using lithium as a first wall material in fusion reactors?
a) High melting point
b) Low atomic number
c) High thermal conductivity
d) Neutron multiplication
Answer: b) Low atomic number
64. In a plasma with magnetic field B = 2 T, what is the Larmor radius of a proton with kinetic
energy 10 keV? (Use m_p = 1.67 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 1.6 cm
b) 3.2 cm
c) 4.8 cm
d) 6.4 cm
Answer: b) 3.2 cm
65. Which of the following is NOT a type of plasma etching process?
a) Reactive ion etching
b) Sputter etching
c) Deep reactive ion etching
d) Plasma arc etching
Answer: d) Plasma arc etching
66. What is the primary purpose of a plasma antenna?
a) To generate plasma
b) To heat plasma
c) To transmit and receive radio waves
d) To measure plasma density
Answer: c) To transmit and receive radio waves
67. Which of the following is NOT a type of plasma spectroscopy technique?
a) Optical emission spectroscopy
b) Laser-induced breakdown spectroscopy
c) X-ray photoelectron spectroscopy
d) Plasma chromatography spectroscopy
Answer: d) Plasma chromatography spectroscopy
68. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
69. In a plasma with electron temperature T_e = 20 eV, what is the electron thermal velocity?
(Use m_e = 9.1 × 10^-31 kg)
a) 1.9 × 10^6 m/s
b) 2.7 × 10^6 m/s
c) 3.8 × 10^6 m/s
d) 5.4 × 10^6 m/s
Answer: b) 2.7 × 10^6 m/s
70. Which of the following is NOT a type of plasma confinement scheme?
a) Magnetic confinement
b) Inertial confinement
c) Electrostatic confinement
d) Gravitational confinement
Answer: d) Gravitational confinement
71. What is the primary purpose of a plasma focus device?
a) To generate X-rays and neutrons
b) To heat fusion plasmas
c) To measure plasma density
d) To control plasma instabilities
Answer: a) To generate X-rays and neutrons
72. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Gridded ion thruster
b) Hall effect thruster
c) Magnetoplasmadynamic thruster
d) Plasma combustion thruster
Answer: d) Plasma combustion thruster
73. What is the primary advantage of using radio frequency heating in fusion plasmas?
a) Lower equipment cost
b) Higher heating efficiency
c) Better plasma stability
d) More localized power deposition
Answer: d) More localized power deposition
74. In a plasma with density n = 10^18 m^-3 and temperature T = 5 eV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 2.8 GHz
b) 5.6 GHz
c) 8.9 GHz
d) 11.2 GHz
Answer: a) 2.8 GHz
75. Which of the following is NOT a type of plasma discharge?
a) Glow discharge
b) Corona discharge
c) Arc discharge
d) Quantum discharge
Answer: d) Quantum discharge
76. What is the primary purpose of a magnetic beach in plasma heating?
a) To reflect plasma waves
b) To absorb plasma waves
c) To generate plasma waves
d) To measure plasma waves
Answer: b) To absorb plasma waves
77. Which of the following is NOT a common application of thermal plasmas?
a) Plasma cutting
b) Plasma spraying
c) Waste treatment
d) Plasma displays
Answer: d) Plasma displays
78. What is the primary advantage of using negative ion sources in neutral beam injectors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
79. In a plasma with magnetic field B = 3 T, what is the electron cyclotron frequency? (Use e =
1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 52.8 GHz
b) 84.0 GHz
c) 105.6 GHz
d) 126.8 GHz
Answer: b) 84.0 GHz
80. Which of the following is NOT a type of plasma diagnostics technique?
a) Langmuir probe
b) Thomson scattering
c) Reflectometry
d) Plasma chromatography
Answer: d) Plasma chromatography
81. What is the primary purpose of a plasma actuator in aerodynamics?
a) To generate thrust
b) To control boundary layer
c) To measure air speed
d) To heat the airflow
Answer: b) To control boundary layer
82. Which of the following is NOT a type of plasma instability in space plasmas?
a) Two-stream instability
b) Firehose instability
c) Weibel instability
d) Plasma condensation instability
Answer: d) Plasma condensation instability
83. What is the primary advantage of using alpha particle heating in fusion reactors?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) Self-sustaining fusion reactions
Answer: d) Self-sustaining fusion reactions
84. In a plasma with ion temperature T_i = 10 keV, what is the most probable speed of
deuterium ions? (Use m_D = 3.34 × 10^-27 kg)
a) 4.9 × 10^5 m/s
b) 6.9 × 10^5 m/s
c) 9.8 × 10^5 m/s
d) 1.4 × 10^6 m/s
Answer: b) 6.9 × 10^5 m/s
85. Which of the following is NOT a type of plasma-based water treatment method?
a) Plasma oxidation
b) Plasma electrolysis
c) Plasma cavitation
d) Plasma distillation
Answer: d) Plasma distillation
86. What is the primary purpose of a plasma limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
87. Which of the following is NOT a type of plasma-based propulsion system?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma sail
d) Plasma combustion engine
Answer: d) Plasma combustion engine
88. What is the primary advantage of using electron cyclotron current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: d) More localized current generation
89. In a plasma with electron density n_e = 10^20 m^-3 and temperature T_e = 10 keV, what is
the electron plasma beta? (Use B = 5 T, μ = 4π × 10^-7 H/m)₀
a) 0.8%
b) 1.6%
c) 3.2%
d) 6.4%
Answer: c) 3.2%
90. Which of the following is NOT a type of plasma-based materials synthesis technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma polymerization
c) Plasma electrolysis
d) Plasma spray pyrolysis
Answer: c) Plasma electrolysis
91. What is the primary purpose of a plasma window?
a) To separate vacuum from atmosphere
b) To heat the plasma
c) To measure plasma density
d) To generate fusion reactions
Answer: a) To separate vacuum from atmosphere
54. In a plasma with electron temperature T_e = 5 keV, what is the Bohm velocity? (Assume
singly ionized hydrogen, m_i = 1.67 × 10^-27 kg)
a) 3.1 × 10^4 m/s
b) 4.9 × 10^4 m/s
c) 6.9 × 10^4 m/s
d) 9.8 × 10^4 m/s
Answer: c) 6.9 × 10^4 m/s
55. Which of the following is NOT a type of plasma deposition technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma spray coating
c) Plasma electrolysis deposition
d) Plasma-assisted molecular beam epitaxy
Answer: c) Plasma electrolysis deposition
56. What is the primary purpose of a magnetic nozzle in plasma propulsion?
a) To accelerate the plasma
b) To cool the plasma
c) To measure plasma velocity
d) To generate fusion reactions
Answer: a) To accelerate the plasma
57. Which of the following is NOT a common plasma sterilization mechanism?
a) UV radiation
b) Reactive species
c) Heat
d) X-ray emission
Answer: d) X-ray emission
58. What is the primary advantage of using negative ion beams for neutral beam injection in
fusion reactors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
59. In a plasma with density n = 10^20 m^-3 and temperature T = 15 keV, what is the Debye
length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 2.9 × 10^-5 m
b) 5.8 × 10^-5 m
c) 8.7 × 10^-5 m
d) 1.2 × 10^-4 m
Answer: b) 5.8 × 10^-5 m
60. Which of the following is NOT a type of plasma accelerator?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma wakefield accelerator
d) Plasma centrifugal accelerator
Answer: d) Plasma centrifugal accelerator
61. What is the primary purpose of electron cyclotron resonance heating in fusion devices?
a) To heat ions directly
b) To heat electrons directly
c) To drive plasma current
d) To control plasma instabilities
Answer: b) To heat electrons directly
62. Which of the following is NOT a common application of low-temperature plasmas?
a) Plasma TVs
b) Fluorescent lamps
c) Plasma-assisted combustion
d) Plasma fusion reactors
Answer: d) Plasma fusion reactors
63. What is the primary advantage of using lithium as a first wall material in fusion reactors?
a) High melting point
b) Low atomic number
c) High thermal conductivity
d) Neutron multiplication
Answer: b) Low atomic number
64. In a plasma with magnetic field B = 2 T, what is the Larmor radius of a proton with kinetic
energy 10 keV? (Use m_p = 1.67 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 1.6 cm
b) 3.2 cm
c) 4.8 cm
d) 6.4 cm
Answer: b) 3.2 cm
65. Which of the following is NOT a type of plasma etching process?
a) Reactive ion etching
b) Sputter etching
c) Deep reactive ion etching
d) Plasma arc etching
Answer: d) Plasma arc etching
66. What is the primary purpose of a plasma antenna?
a) To generate plasma
b) To heat plasma
c) To transmit and receive radio waves
d) To measure plasma density
Answer: c) To transmit and receive radio waves
67. Which of the following is NOT a type of plasma spectroscopy technique?
a) Optical emission spectroscopy
b) Laser-induced breakdown spectroscopy
c) X-ray photoelectron spectroscopy
d) Plasma chromatography spectroscopy
Answer: d) Plasma chromatography spectroscopy
68. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
69. In a plasma with electron temperature T_e = 20 eV, what is the electron thermal velocity?
(Use m_e = 9.1 × 10^-31 kg)
a) 1.9 × 10^6 m/s
b) 2.7 × 10^6 m/s
c) 3.8 × 10^6 m/s
d) 5.4 × 10^6 m/s
Answer: b) 2.7 × 10^6 m/s
70. Which of the following is NOT a type of plasma confinement scheme?
a) Magnetic confinement
b) Inertial confinement
c) Electrostatic confinement
d) Gravitational confinement
Answer: d) Gravitational confinement
71. What is the primary purpose of a plasma focus device?
a) To generate X-rays and neutrons
b) To heat fusion plasmas
c) To measure plasma density
d) To control plasma instabilities
Answer: a) To generate X-rays and neutrons
72. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Gridded ion thruster
b) Hall effect thruster
c) Magnetoplasmadynamic thruster
d) Plasma combustion thruster
Answer: d) Plasma combustion thruster
73. What is the primary advantage of using radio frequency heating in fusion plasmas?
a) Lower equipment cost
b) Higher heating efficiency
c) Better plasma stability
d) More localized power deposition
Answer: d) More localized power deposition
74. In a plasma with density n = 10^18 m^-3 and temperature T = 5 eV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 2.8 GHz
b) 5.6 GHz
c) 8.9 GHz
d) 11.2 GHz
Answer: a) 2.8 GHz
75. Which of the following is NOT a type of plasma discharge?
a) Glow discharge
b) Corona discharge
c) Arc discharge
d) Quantum discharge
Answer: d) Quantum discharge
76. What is the primary purpose of a magnetic beach in plasma heating?
a) To reflect plasma waves
b) To absorb plasma waves
c) To generate plasma waves
d) To measure plasma waves
Answer: b) To absorb plasma waves
77. Which of the following is NOT a common application of thermal plasmas?
a) Plasma cutting
b) Plasma spraying
c) Waste treatment
d) Plasma displays
Answer: d) Plasma displays
78. What is the primary advantage of using negative ion sources in neutral beam injectors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
79. In a plasma with magnetic field B = 3 T, what is the electron cyclotron frequency? (Use e =
1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 52.8 GHz
b) 84.0 GHz
c) 105.6 GHz
d) 126.8 GHz
Answer: b) 84.0 GHz
80. Which of the following is NOT a type of plasma diagnostics technique?
a) Langmuir probe
b) Thomson scattering
c) Reflectometry
d) Plasma chromatography
Answer: d) Plasma chromatography
81. What is the primary purpose of a plasma actuator in aerodynamics?
a) To generate thrust
b) To control boundary layer
c) To measure air speed
d) To heat the airflow
Answer: b) To control boundary layer
82. Which of the following is NOT a type of plasma instability in space plasmas?
a) Two-stream instability
b) Firehose instability
c) Weibel instability
d) Plasma condensation instability
Answer: d) Plasma condensation instability
83. What is the primary advantage of using alpha particle heating in fusion reactors?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) Self-sustaining fusion reactions
Answer: d) Self-sustaining fusion reactions
84. In a plasma with ion temperature T_i = 10 keV, what is the most probable speed of
deuterium ions? (Use m_D = 3.34 × 10^-27 kg)
a) 4.9 × 10^5 m/s
b) 6.9 × 10^5 m/s
c) 9.8 × 10^5 m/s
d) 1.4 × 10^6 m/s
Answer: b) 6.9 × 10^5 m/s
85. Which of the following is NOT a type of plasma-based water treatment method?
a) Plasma oxidation
b) Plasma electrolysis
c) Plasma cavitation
d) Plasma distillation
Answer: d) Plasma distillation
86. What is the primary purpose of a plasma limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
87. Which of the following is NOT a type of plasma-based propulsion system?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma sail
d) Plasma combustion engine
Answer: d) Plasma combustion engine
88. What is the primary advantage of using electron cyclotron current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: d) More localized current generation
89. In a plasma with electron density n_e = 10^20 m^-3 and temperature T_e = 10 keV, what is
the electron plasma beta? (Use B = 5 T, μ = 4π × 10^-7 H/m)₀
a) 0.8%
b) 1.6%
c) 3.2%
d) 6.4%
Answer: c) 3.2%
90. Which of the following is NOT a type of plasma-based materials synthesis technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma polymerization
c) Plasma electrolysis
d) Plasma spray pyrolysis
Answer: c) Plasma electrolysis
91. What is the primary purpose of a plasma window?
a) To separate vacuum from atmosphere
b) To heat the plasma
c) To measure plasma density
d) To generate fusion reactions
Answer: a) To separate vacuum from atmosphere
54. In a plasma with electron temperature T_e = 5 keV, what is the Bohm velocity? (Assume
singly ionized hydrogen, m_i = 1.67 × 10^-27 kg)
a) 3.1 × 10^4 m/s
b) 4.9 × 10^4 m/s
c) 6.9 × 10^4 m/s
d) 9.8 × 10^4 m/s
Answer: c) 6.9 × 10^4 m/s
55. Which of the following is NOT a type of plasma deposition technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma spray coating
c) Plasma electrolysis deposition
d) Plasma-assisted molecular beam epitaxy
Answer: c) Plasma electrolysis deposition
56. What is the primary purpose of a magnetic nozzle in plasma propulsion?
a) To accelerate the plasma
b) To cool the plasma
c) To measure plasma velocity
d) To generate fusion reactions
Answer: a) To accelerate the plasma
57. Which of the following is NOT a common plasma sterilization mechanism?
a) UV radiation
b) Reactive species
c) Heat
d) X-ray emission
Answer: d) X-ray emission
58. What is the primary advantage of using negative ion beams for neutral beam injection in
fusion reactors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
59. In a plasma with density n = 10^20 m^-3 and temperature T = 15 keV, what is the Debye
length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 2.9 × 10^-5 m
b) 5.8 × 10^-5 m
c) 8.7 × 10^-5 m
d) 1.2 × 10^-4 m
Answer: b) 5.8 × 10^-5 m
60. Which of the following is NOT a type of plasma accelerator?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma wakefield accelerator
d) Plasma centrifugal accelerator
Answer: d) Plasma centrifugal accelerator
61. What is the primary purpose of electron cyclotron resonance heating in fusion devices?
a) To heat ions directly
b) To heat electrons directly
c) To drive plasma current
d) To control plasma instabilities
Answer: b) To heat electrons directly
62. Which of the following is NOT a common application of low-temperature plasmas?
a) Plasma TVs
b) Fluorescent lamps
c) Plasma-assisted combustion
d) Plasma fusion reactors
Answer: d) Plasma fusion reactors
63. What is the primary advantage of using lithium as a first wall material in fusion reactors?
a) High melting point
b) Low atomic number
c) High thermal conductivity
d) Neutron multiplication
Answer: b) Low atomic number
64. In a plasma with magnetic field B = 2 T, what is the Larmor radius of a proton with kinetic
energy 10 keV? (Use m_p = 1.67 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 1.6 cm
b) 3.2 cm
c) 4.8 cm
d) 6.4 cm
Answer: b) 3.2 cm
65. Which of the following is NOT a type of plasma etching process?
a) Reactive ion etching
b) Sputter etching
c) Deep reactive ion etching
d) Plasma arc etching
Answer: d) Plasma arc etching
66. What is the primary purpose of a plasma antenna?
a) To generate plasma
b) To heat plasma
c) To transmit and receive radio waves
d) To measure plasma density
Answer: c) To transmit and receive radio waves
67. Which of the following is NOT a type of plasma spectroscopy technique?
a) Optical emission spectroscopy
b) Laser-induced breakdown spectroscopy
c) X-ray photoelectron spectroscopy
d) Plasma chromatography spectroscopy
Answer: d) Plasma chromatography spectroscopy
68. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
69. In a plasma with electron temperature T_e = 20 eV, what is the electron thermal velocity?
(Use m_e = 9.1 × 10^-31 kg)
a) 1.9 × 10^6 m/s
b) 2.7 × 10^6 m/s
c) 3.8 × 10^6 m/s
d) 5.4 × 10^6 m/s
Answer: b) 2.7 × 10^6 m/s
70. Which of the following is NOT a type of plasma confinement scheme?
a) Magnetic confinement
b) Inertial confinement
c) Electrostatic confinement
d) Gravitational confinement
Answer: d) Gravitational confinement
71. What is the primary purpose of a plasma focus device?
a) To generate X-rays and neutrons
b) To heat fusion plasmas
c) To measure plasma density
d) To control plasma instabilities
Answer: a) To generate X-rays and neutrons
72. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Gridded ion thruster
b) Hall effect thruster
c) Magnetoplasmadynamic thruster
d) Plasma combustion thruster
Answer: d) Plasma combustion thruster
73. What is the primary advantage of using radio frequency heating in fusion plasmas?
a) Lower equipment cost
b) Higher heating efficiency
c) Better plasma stability
d) More localized power deposition
Answer: d) More localized power deposition
74. In a plasma with density n = 10^18 m^-3 and temperature T = 5 eV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 2.8 GHz
b) 5.6 GHz
c) 8.9 GHz
d) 11.2 GHz
Answer: a) 2.8 GHz
75. Which of the following is NOT a type of plasma discharge?
a) Glow discharge
b) Corona discharge
c) Arc discharge
d) Quantum discharge
Answer: d) Quantum discharge
76. What is the primary purpose of a magnetic beach in plasma heating?
a) To reflect plasma waves
b) To absorb plasma waves
c) To generate plasma waves
d) To measure plasma waves
Answer: b) To absorb plasma waves
77. Which of the following is NOT a common application of thermal plasmas?
a) Plasma cutting
b) Plasma spraying
c) Waste treatment
d) Plasma displays
Answer: d) Plasma displays
78. What is the primary advantage of using negative ion sources in neutral beam injectors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
79. In a plasma with magnetic field B = 3 T, what is the electron cyclotron frequency? (Use e =
1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 52.8 GHz
b) 84.0 GHz
c) 105.6 GHz
d) 126.8 GHz
Answer: b) 84.0 GHz
80. Which of the following is NOT a type of plasma diagnostics technique?
a) Langmuir probe
b) Thomson scattering
c) Reflectometry
d) Plasma chromatography
Answer: d) Plasma chromatography
81. What is the primary purpose of a plasma actuator in aerodynamics?
a) To generate thrust
b) To control boundary layer
c) To measure air speed
d) To heat the airflow
Answer: b) To control boundary layer
82. Which of the following is NOT a type of plasma instability in space plasmas?
a) Two-stream instability
b) Firehose instability
c) Weibel instability
d) Plasma condensation instability
Answer: d) Plasma condensation instability
83. What is the primary advantage of using alpha particle heating in fusion reactors?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) Self-sustaining fusion reactions
Answer: d) Self-sustaining fusion reactions
84. In a plasma with ion temperature T_i = 10 keV, what is the most probable speed of
deuterium ions? (Use m_D = 3.34 × 10^-27 kg)
a) 4.9 × 10^5 m/s
b) 6.9 × 10^5 m/s
c) 9.8 × 10^5 m/s
d) 1.4 × 10^6 m/s
Answer: b) 6.9 × 10^5 m/s
85. Which of the following is NOT a type of plasma-based water treatment method?
a) Plasma oxidation
b) Plasma electrolysis
c) Plasma cavitation
d) Plasma distillation
Answer: d) Plasma distillation
86. What is the primary purpose of a plasma limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
87. Which of the following is NOT a type of plasma-based propulsion system?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma sail
d) Plasma combustion engine
Answer: d) Plasma combustion engine
88. What is the primary advantage of using electron cyclotron current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: d) More localized current generation
89. In a plasma with electron density n_e = 10^20 m^-3 and temperature T_e = 10 keV, what is
the electron plasma beta? (Use B = 5 T, μ = 4π × 10^-7 H/m)₀
a) 0.8%
b) 1.6%
c) 3.2%
d) 6.4%
Answer: c) 3.2%
90. Which of the following is NOT a type of plasma-based materials synthesis technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma polymerization
c) Plasma electrolysis
d) Plasma spray pyrolysis
Answer: c) Plasma electrolysis
91. What is the primary purpose of a plasma window?
a) To separate vacuum from atmosphere
b) To heat the plasma
c) To measure plasma density
d) To generate fusion reactions
Answer: a) To separate vacuum from atmosphere
54. In a plasma with electron temperature T_e = 5 keV, what is the Bohm velocity? (Assume
singly ionized hydrogen, m_i = 1.67 × 10^-27 kg)
a) 3.1 × 10^4 m/s
b) 4.9 × 10^4 m/s
c) 6.9 × 10^4 m/s
d) 9.8 × 10^4 m/s
Answer: c) 6.9 × 10^4 m/s
55. Which of the following is NOT a type of plasma deposition technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma spray coating
c) Plasma electrolysis deposition
d) Plasma-assisted molecular beam epitaxy
Answer: c) Plasma electrolysis deposition
56. What is the primary purpose of a magnetic nozzle in plasma propulsion?
a) To accelerate the plasma
b) To cool the plasma
c) To measure plasma velocity
d) To generate fusion reactions
Answer: a) To accelerate the plasma
57. Which of the following is NOT a common plasma sterilization mechanism?
a) UV radiation
b) Reactive species
c) Heat
d) X-ray emission
Answer: d) X-ray emission
58. What is the primary advantage of using negative ion beams for neutral beam injection in
fusion reactors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
59. In a plasma with density n = 10^20 m^-3 and temperature T = 15 keV, what is the Debye
length? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, k = 1.38 × 10^-23 J/K)₀
a) 2.9 × 10^-5 m
b) 5.8 × 10^-5 m
c) 8.7 × 10^-5 m
d) 1.2 × 10^-4 m
Answer: b) 5.8 × 10^-5 m
60. Which of the following is NOT a type of plasma accelerator?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma wakefield accelerator
d) Plasma centrifugal accelerator
Answer: d) Plasma centrifugal accelerator
61. What is the primary purpose of electron cyclotron resonance heating in fusion devices?
a) To heat ions directly
b) To heat electrons directly
c) To drive plasma current
d) To control plasma instabilities
Answer: b) To heat electrons directly
62. Which of the following is NOT a common application of low-temperature plasmas?
a) Plasma TVs
b) Fluorescent lamps
c) Plasma-assisted combustion
d) Plasma fusion reactors
Answer: d) Plasma fusion reactors
63. What is the primary advantage of using lithium as a first wall material in fusion reactors?
a) High melting point
b) Low atomic number
c) High thermal conductivity
d) Neutron multiplication
Answer: b) Low atomic number
64. In a plasma with magnetic field B = 2 T, what is the Larmor radius of a proton with kinetic
energy 10 keV? (Use m_p = 1.67 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 1.6 cm
b) 3.2 cm
c) 4.8 cm
d) 6.4 cm
Answer: b) 3.2 cm
65. Which of the following is NOT a type of plasma etching process?
a) Reactive ion etching
b) Sputter etching
c) Deep reactive ion etching
d) Plasma arc etching
Answer: d) Plasma arc etching
66. What is the primary purpose of a plasma antenna?
a) To generate plasma
b) To heat plasma
c) To transmit and receive radio waves
d) To measure plasma density
Answer: c) To transmit and receive radio waves
67. Which of the following is NOT a type of plasma spectroscopy technique?
a) Optical emission spectroscopy
b) Laser-induced breakdown spectroscopy
c) X-ray photoelectron spectroscopy
d) Plasma chromatography spectroscopy
Answer: d) Plasma chromatography spectroscopy
68. What is the primary advantage of using helicon plasma sources in materials processing?
a) Low power consumption
b) High plasma density
c) Easy scalability
d) Low operating pressure
Answer: b) High plasma density
69. In a plasma with electron temperature T_e = 20 eV, what is the electron thermal velocity?
(Use m_e = 9.1 × 10^-31 kg)
a) 1.9 × 10^6 m/s
b) 2.7 × 10^6 m/s
c) 3.8 × 10^6 m/s
d) 5.4 × 10^6 m/s
Answer: b) 2.7 × 10^6 m/s
70. Which of the following is NOT a type of plasma confinement scheme?
a) Magnetic confinement
b) Inertial confinement
c) Electrostatic confinement
d) Gravitational confinement
Answer: d) Gravitational confinement
71. What is the primary purpose of a plasma focus device?
a) To generate X-rays and neutrons
b) To heat fusion plasmas
c) To measure plasma density
d) To control plasma instabilities
Answer: a) To generate X-rays and neutrons
72. Which of the following is NOT a type of plasma thruster used in space propulsion?
a) Gridded ion thruster
b) Hall effect thruster
c) Magnetoplasmadynamic thruster
d) Plasma combustion thruster
Answer: d) Plasma combustion thruster
73. What is the primary advantage of using radio frequency heating in fusion plasmas?
a) Lower equipment cost
b) Higher heating efficiency
c) Better plasma stability
d) More localized power deposition
Answer: d) More localized power deposition
74. In a plasma with density n = 10^18 m^-3 and temperature T = 5 eV, what is the plasma
frequency? (Use e = 1.6 × 10^-19 C, ε = 8.85 × 10^-12 F/m, m_e = 9.1 × 10^-31 kg)₀
a) 2.8 GHz
b) 5.6 GHz
c) 8.9 GHz
d) 11.2 GHz
Answer: a) 2.8 GHz
75. Which of the following is NOT a type of plasma discharge?
a) Glow discharge
b) Corona discharge
c) Arc discharge
d) Quantum discharge
Answer: d) Quantum discharge
76. What is the primary purpose of a magnetic beach in plasma heating?
a) To reflect plasma waves
b) To absorb plasma waves
c) To generate plasma waves
d) To measure plasma waves
Answer: b) To absorb plasma waves
77. Which of the following is NOT a common application of thermal plasmas?
a) Plasma cutting
b) Plasma spraying
c) Waste treatment
d) Plasma displays
Answer: d) Plasma displays
78. What is the primary advantage of using negative ion sources in neutral beam injectors?
a) Higher neutralization efficiency
b) Lower beam energy
c) Easier beam focusing
d) Lower equipment cost
Answer: a) Higher neutralization efficiency
79. In a plasma with magnetic field B = 3 T, what is the electron cyclotron frequency? (Use e =
1.6 × 10^-19 C, m_e = 9.1 × 10^-31 kg)
a) 52.8 GHz
b) 84.0 GHz
c) 105.6 GHz
d) 126.8 GHz
Answer: b) 84.0 GHz
80. Which of the following is NOT a type of plasma diagnostics technique?
a) Langmuir probe
b) Thomson scattering
c) Reflectometry
d) Plasma chromatography
Answer: d) Plasma chromatography
81. What is the primary purpose of a plasma actuator in aerodynamics?
a) To generate thrust
b) To control boundary layer
c) To measure air speed
d) To heat the airflow
Answer: b) To control boundary layer
82. Which of the following is NOT a type of plasma instability in space plasmas?
a) Two-stream instability
b) Firehose instability
c) Weibel instability
d) Plasma condensation instability
Answer: d) Plasma condensation instability
83. What is the primary advantage of using alpha particle heating in fusion reactors?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) Self-sustaining fusion reactions
Answer: d) Self-sustaining fusion reactions
84. In a plasma with ion temperature T_i = 10 keV, what is the most probable speed of
deuterium ions? (Use m_D = 3.34 × 10^-27 kg)
a) 4.9 × 10^5 m/s
b) 6.9 × 10^5 m/s
c) 9.8 × 10^5 m/s
d) 1.4 × 10^6 m/s
Answer: b) 6.9 × 10^5 m/s
85. Which of the following is NOT a type of plasma-based water treatment method?
a) Plasma oxidation
b) Plasma electrolysis
c) Plasma cavitation
d) Plasma distillation
Answer: d) Plasma distillation
86. What is the primary purpose of a plasma limiter in a tokamak?
a) To heat the plasma
b) To control plasma shape
c) To measure plasma temperature
d) To generate fusion reactions
Answer: b) To control plasma shape
87. Which of the following is NOT a type of plasma-based propulsion system?
a) Magnetoplasmadynamic thruster
b) Pulsed plasma thruster
c) Plasma sail
d) Plasma combustion engine
Answer: d) Plasma combustion engine
88. What is the primary advantage of using electron cyclotron current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: d) More localized current generation
89. In a plasma with electron density n_e = 10^20 m^-3 and temperature T_e = 10 keV, what is
the electron plasma beta? (Use B = 5 T, μ = 4π × 10^-7 H/m)₀
a) 0.8%
b) 1.6%
c) 3.2%
d) 6.4%
Answer: c) 3.2%
90. Which of the following is NOT a type of plasma-based materials synthesis technique?
a) Plasma-enhanced chemical vapor deposition
b) Plasma polymerization
c) Plasma electrolysis
d) Plasma spray pyrolysis
Answer: c) Plasma electrolysis
91. What is the primary purpose of a plasma window?
a) To separate vacuum from atmosphere
b) To heat the plasma
c) To measure plasma density
d) To generate fusion reactions
Answer: a) To separate vacuum from atmosphere
92. Which of the following is NOT a type of plasma-based space propulsion concept?
a) Variable specific impulse magnetoplasma rocket (VASIMR)
b) Electrodeless plasma thruster
c) Plasma bubble thruster
d) Plasma antimatter thruster
Answer: d) Plasma antimatter thruster
93. What is the primary advantage of using lower hybrid current drive in tokamaks?
a) Higher current drive efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized current generation
Answer: a) Higher current drive efficiency
94. In a plasma with ion temperature T_i = 15 keV, what is the ion acoustic speed for
deuterium? (Use m_D = 3.34 × 10^-27 kg, γ = 5/3)
a) 2.7 × 10^5 m/s
b) 3.8 × 10^5 m/s
c) 5.4 × 10^5 m/s
d) 7.6 × 10^5 m/s
Answer: c) 5.4 × 10^5 m/s
95. Which of the following is NOT a type of plasma-based nanotechnology application?
a) Plasma-enhanced atomic layer deposition
b) Plasma-assisted nanoparticle synthesis
c) Plasma-induced surface nanostructuring
d) Plasma nanocrystallization
Answer: d) Plasma nanocrystallization
96. What is the primary purpose of a plasma catalyst in chemical processing?
a) To increase reaction rate
b) To decrease reaction temperature
c) To improve product selectivity
d) All of the above
Answer: d) All of the above
97. Which of the following is NOT a type of plasma-based medical treatment?
a) Plasma skin regeneration
b) Plasma sterilization
c) Plasma coagulation
d) Plasma vaccination
Answer: d) Plasma vaccination
98. What is the primary advantage of using ion cyclotron resonance heating in fusion plasmas?
a) Higher heating efficiency
b) Lower equipment cost
c) Better plasma stability
d) More localized ion heating
Answer: d) More localized ion heating
99. In a plasma with magnetic field B = 4 T, what is the ion cyclotron frequency for deuterium?
(Use m_D = 3.34 × 10^-27 kg, e = 1.6 × 10^-19 C)
a) 15.3 MHz
b) 30.6 MHz
c) 45.9 MHz
d) 61.2 MHz
Answer: b) 30.6 MHz
100. Which of the following is NOT a type of plasma-based environmental remediation
technique?
a) Plasma gasification
b) Non-thermal plasma air purification
c) Plasma water treatment
d) Plasma soil decontamination
Answer: d) Plasma soil decontamination
.
