Mathematical problems related to the use of telemetry systems in
aircraft data transmission, along with their answers:: Mathematical
Problems on Aircraft Telemetry Systems
1. If an aircraft transmits data at a rate of 256 kbps, how many megabytes of data can be transmitted
in 5 minutes?
A) 9.6 MB B) 76.8 MB C) 96 MB D) 7.68 MB
Answer: B) 76.8 MB
2. A ground station receives telemetry data from 12 aircraft simultaneously. If each aircraft transmits
at 128 kbps, what is the total data rate received by the ground station?
A) 1.536 Mbps B) 15.36 Mbps C) 153.6 Mbps D) 1,536 Mbps
Answer: A) 1.536 Mbps
3. An aircraft's telemetry system samples 10 different parameters every 0.1 seconds. If each
parameter requires 16 bits to encode, what is the minimum data rate required for transmission?
A) 1.6 kbps B) 16 kbps C) 160 kbps D) 1,600 kbps
Answer: B) 16 kbps
4. A telemetry packet contains 1024 bytes of data and 32 bytes of overhead. What percentage of the
total packet size is actual data?
A) 96.9% B) 97.0% C) 98.0% D) 99.0%
Answer: A) 96.9%
5. If a ground station can process 2 million telemetry samples per second, how many aircraft can it
monitor simultaneously if each aircraft sends 5,000 samples per second?
A) 40 B) 400 C) 4,000 D) 40,000
Answer: B) 400
6. An aircraft transmits telemetry data using QPSK modulation with a symbol rate of 1 Msps. What is
the maximum achievable data rate?
A) 1 Mbps B) 2 Mbps C) 4 Mbps D) 8 Mbps
Answer: B) 2 Mbps
7. A telemetry system uses a (255,223) Reed-Solomon code for error correction. What is the code
rate?
A) 0.874 B) 0.914 C) 0.944 D) 0.975
Answer: A) 0.874
8. If an aircraft's telemetry system has a bit error rate (BER) of 10^-6, approximately how many errors
can be expected in a 1 MB transmission?
A) 1 B) 8 C) 10 D) 80
Answer: B) 8
9. A ground station antenna has a gain of 20 dBi. What is the linear power gain?
A) 10 B) 20 C) 100 D) 200
Answer: C) 100
10. An aircraft transmits telemetry data at 5 W. If the transmission experiences a path loss of 130 dB,
what is the received power at the ground station (ignoring antenna gains)?
A) 5 pW B) 50 pW C) 500 pW D) 5 nW
Answer: B) 50 pW
11. A telemetry system uses 8-bit ADCs to sample analog signals. What is the theoretical maximum
signal-to-quantization noise ratio (SQNR)?
A) 37.5 dB B) 49.9 dB C) 56.0 dB D) 98.1 dB
Answer: B) 49.9 dB
12. If an aircraft's telemetry system has a range of 300 km, what is the maximum time delay for the
signal to reach the ground station?
A) 0.5 ms B) 1.0 ms C) 1.5 ms D) 2.0 ms
Answer: B) 1.0 ms
13. A ground station uses a dish antenna with a diameter of 3 meters to receive telemetry data at 2.4
GHz. What is the antenna's beamwidth (in degrees)?
A) 2.9° B) 3.6° C) 4.3° D) 5.0°
Answer: C) 4.3°
14. An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
Answer: C) 1.6
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
An aircraft transmits telemetry data using BPSK modulation with a bit rate of 1 Mbps. What is the
minimum required bandwidth according to Nyquist's theorem?
A) 0.5 MHz B) 1.0 MHz C) 1.5 MHz D) 2.0 MHz
Answer: B) 1.0 MHz
15. If a telemetry system uses a convolutional code with a rate of 1/2 and a constraint length of 7,
how many states are in the decoder's trellis diagram?
A) 32 B) 64 C) 128 D) 256
Answer: B) 64
16. A ground station receives telemetry data from an aircraft with a carrier-to-noise ratio (C/N) of 15
dB. What is the corresponding linear ratio?
A) 15 B) 31.6 C) 45 D) 316
Answer: B) 31.6
17. An aircraft's telemetry system uses frequency hopping with 100 channels. If each hop lasts 10 ms,
what is the hopping rate?
A) 10 Hz B) 100 Hz C) 1 kHz D) 10 kHz
Answer: B) 100 Hz
18. A telemetry system uses OQPSK modulation with a symbol rate of 5 Msps. What is the occupied
bandwidth if the roll-off factor of the pulse-shaping filter is 0.35?
A) 5.0 MHz B) 6.75 MHz C) 7.5 MHz D) 10.0 MHz
Answer: B) 6.75 MHz
19. If an aircraft's telemetry system has an EIRP of 20 dBW and the free-space path loss to the
ground station is 150 dB, what is the received power at a ground station with an antenna gain of 30
dBi?
A) -100 dBW B) -110 dBW C) -120 dBW D) -130 dBW
Answer: A) -100 dBW
20. A telemetry system uses a frame structure with 1000 bits per frame, including 20 bits for
synchronization. What percentage of the frame is used for actual data?
A) 97.0% B) 97.5% C) 98.0% D) 98.5%
Answer: C) 98.0%
21. If an aircraft's telemetry system has a bit rate of 2 Mbps and uses QPSK modulation, what is the
symbol rate?
A) 500 ksps B) 1 Msps C) 2 Msps D) 4 Msps
Answer: B) 1 Msps
22. A ground station uses a parabolic antenna with a diameter of 5 meters to receive telemetry data
at 5.6 GHz. What is the antenna's gain (assuming 55% efficiency)?
A) 36.5 dBi B) 41.5 dBi C) 46.5 dBi D) 51.5 dBi
Answer: C) 46.5 dBi
23. An aircraft's telemetry system uses a (127,99) BCH code for error correction. How many errors
can this code correct per codeword?
A) 2 B) 3 C) 4 D) 5
Answer: C) 4
24. If a telemetry system uses 16-QAM modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: D) 40 Mbps
25. A ground station receives telemetry data with an Eb/N0 of 12 dB. What is the corresponding
linear ratio?
A) 12 B) 15.8 C) 20 D) 25.1
Answer: B) 15.8
26. An aircraft's telemetry system uses a spread spectrum technique with a processing gain of 20 dB.
If the data rate is 100 kbps, what is the chip rate?
A) 1 Mcps B) 2 Mcps C) 5 Mcps D) 10 Mcps
Answer: D) 10 Mcps
27. If a telemetry system uses 8B/10B encoding, what is the efficiency of the encoding scheme?
A) 75% B) 80% C) 85% D) 90%
Answer: B) 80%
28. A ground station uses a tracking antenna with a slew rate of 10°/s. How long does it take for the
antenna to rotate 180°?
A) 9 s B) 18 s C) 27 s D) 36 s
Answer: B) 18 s
29. An aircraft's telemetry system transmits data at 1 Mbps. If the system uses a (255,223) Reed-
Solomon code, what is the effective data rate?
A) 749 kbps B) 819 kbps C) 874 kbps D) 914 kbps
Answer: C) 874 kbps
30. If a telemetry system uses GMSK modulation with BT=0.3, what is the approximate 99%
bandwidth occupancy for a bit rate of 2 Mbps?
A) 1.8 MHz B) 2.4 MHz C) 3.0 MHz D) 3.6 MHz
Answer: B) 2.4 MHz
31. A ground station receives telemetry data from an aircraft at a distance of 500 km. If the signal
travels at the speed of light, what is the propagation delay?
A) 0.83 ms B) 1.67 ms C) 2.50 ms D) 3.33 ms
Answer: B) 1.67 ms
32. An aircraft's telemetry system uses a convolutional code with a rate of 2/3. If the uncoded bit rate
is 3 Mbps, what is the coded bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 4.5 Mbps
Answer: D) 4.5 Mbps
33. If a telemetry system uses 64-QAM modulation with a symbol rate of 5 Msps, what is the raw bit
rate?
A) 15 Mbps B) 20 Mbps C) 25 Mbps D) 30 Mbps
Answer: D) 30 Mbps
34. A ground station antenna has a 3 dB beamwidth of 2°. What is the approximate antenna gain?
A) 25 dBi B) 30 dBi C) 35 dBi D) 40 dBi
Answer: C) 35 dBi
35. An aircraft's telemetry system uses a turbo code with a rate of 1/3. If the coded bit rate is 6
Mbps, what is the information bit rate?
A) 1 Mbps B) 2 Mbps C) 3 Mbps D) 4 Mbps
Answer: B) 2 Mbps
36. If a telemetry system uses OFDM with 1024 subcarriers and a total bandwidth of 20 MHz, what is
the subcarrier spacing?
A) 9.77 kHz B) 19.53 kHz C) 39.06 kHz D) 78.13 kHz
Answer: B) 19.53 kHz
37. A ground station receives telemetry data with a carrier frequency of 2.4 GHz. If the aircraft is
moving at 900 km/h directly towards the station, what is the maximum Doppler shift?
A) 1.0 kHz B) 2.0 kHz C) 3.0 kHz D) 4.0 kHz
Answer: B) 2.0 kHz
38. An aircraft's telemetry system uses a (31,26) Hamming code. What is the code rate?
A) 0.774 B) 0.806 C) 0.839 D) 0.871
Answer: C) 0.839
39. If a telemetry system uses π/4-DQPSK modulation with a symbol rate of 2 Msps, what is the raw
bit rate?
A) 2 Mbps B) 3 Mbps C) 4 Mbps D) 5 Mbps
Answer: C) 4 Mbps
40. A ground station uses a tracking antenna with a half-power beamwidth of 3°. What is the
approximate tracking accuracy required to keep the signal within 1 dB of the peak gain?
A) 0.45° B) 0.65° C) 0.85° D) 1.05°
Answer: B) 0.65°
41. An aircraft's telemetry system uses a PCM encoder with 12-bit resolution. How many unique
quantization levels are possible?
A) 2048 B) 3072 C) 4096 D) 8192
Answer: C) 4096
42. If a telemetry system uses 8-PSK modulation with a symbol rate of 10 Msps, what is the raw bit
rate?
A) 10 Mbps B) 20 Mbps C) 30 Mbps D) 40 Mbps
Answer: C) 30 Mbps
43. A ground station receives telemetry data with a signal-to-noise ratio (SNR) of 20 dB. What is the
corresponding linear ratio?
A) 20 B) 50 C) 100 D) 200
Answer: C) 100
44. An aircraft's telemetry system uses a frame structure with 2000 bits per frame, including 40 bits
for error detection. What is the frame efficiency?
A) 96.0% B) 97.0% C) 98.0% D) 99.0%
Answer: C) 98.0%
45. If a telemetry system uses LDPC coding with a code rate of 4/5, what percentage of the
transmitted bits are parity bits?
A) 10% B) 15% C) 20% D) 25%
Answer: C) 20%
46. A ground station antenna has a gain of 25 dBi and an efficiency of 60%. What is the antenna's
effective aperture at a frequency of 3 GHz?
A) 0.53 m² B) 1.06 m² C) 1.59 m² D) 2.12 m²
Answer: B) 1.06 m²
47. An aircraft's telemetry system samples analog data at 100 kHz with 16-bit resolution. What is the
resulting data rate?
A) 800 kbps B) 1.2 Mbps C) 1.6 Mbps D) 2.0 Mbps
Answer: C) 1.6 Mbps
48. If a telemetry system uses QPSK modulation with a roll-off factor of 0.25, what is the bandwidth
efficiency in bits/s/Hz?
A) 1.2 B) 1.4 C) 1.6 D) 1.8
49. A ground station receives telemetry data from an aircraft at an
