FOR ROAL FINAL EXAM

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1. (TCO 1) The signal is 5 sin (2 pi 2000 t + 60 degrees). The amplitude of this signal is(Points : 5)

5 VPP 3.535 VPP 3.535 VRMS 3.535 VPK

Question 2.2. (TCO 1) The signal is 5 sin (2 pi 2000 t + 60 degrees). The frequency of this signal is(Points : 5)

2000 Hz 1000 Hz 6280 Hz 10 kHz

Question 3.3. (TCO 1) The signal is 1 sin (2 pi 500 t - 45 degrees). The phase shift of this signal is(Points : 5)

-60 degrees +45 degrees -45 degrees -90 degrees

Question 4.4. (TCO 1) The signal is 10 sin (2 pi 1000 t + 30 degrees). The voltage displayed on the DMM is (Points : 5)

10 V PP 7.07 V PP 7.07 VRMS 10 VPK

Question 5.5. (TCO 1) Inductive reactance XL is (Points : 5)

directly related to only frequency. directly related to only inductance. directly related to the product of 2 , times the inductance L and frequency f. No correct answer listed

Question 6.6. (TCO 2) In an AC circuit with reactance XC in series with a resistor the circuit current(Points : 5)

leads the applied voltage. lags the applied voltage. voltage and the current are in phase. No correct answer is listed

Question 7.7. (TCO 2) For the following series AC circuit, the angle of the circuit impedance is

(Points : 5)

0 degrees +90 degrees -45 degrees +45 degrees

Question 8.8. (TCO 2) For the following series AC circuit, the phase angle of the circuit current is

(Points : 5)

0 degrees +90 degrees +45 degrees -45 degrees

Question 9.9. (TCO 2) For the following series AC circuit, the total circuit impedance is:

(Points : 5)

200 - j 100 200 + j 100 200 - j 200 200 + j 300

Question 10.10. (TCO 3) For the parallel AC circuit shown below, find the circuit current IS . Note thatVin AC is mislabeled, it should be 10V, NOT 10 sin(ω t).

(Points : 5)

0.1 + j 0.1 A 0.1 - j 0.1 A 0.1 A j 0.1 A

Question 11.11. (TCO 3) The total admittance for the following circuit is Hint: YT = G + j (BC - BL) siemens; G = 1/R siemens; BC = C siemens and BL = 1/[ L ] Siemens

(Points : 5)

0.005 - j 0.015 siemens 0.005 + j 0.015 siemens 0.01 - j 0.005 siemens 0.01 + j 0.005 siemens

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Final Exam - Page 2

Question 1.1. (TCO 4) Determine the resonance frequency of the following circuit to the nearest integer value.

(Points : 5)

563 Hz 1125 Hz 281 Hz 1000 Hz

Question 2.2. (TCO 4) We need to purchase an inductor coil for a resonance circuit resonating at 600 kHz; the operating bandwidth is 20 kHz. What is the quality factor Q of the coil?(Points : 5)

600 20 30 1200

Question 3.3. (TCO 5) The superposition theorem is used (Points : 5)

to calculate the short circuit current at the output of a circuit. to analyze any circuit with multiple sources using one at a time. for analyzing DC circuits only. for analyzing AC circuits only.

Question 4.4. (TCO 6) In an audio system we need to feed the audio signal to a mid-range (2 kHz to 5 kHz) speaker. This can be accomplished by using a ______. (Points : 5)

band pass filter low pass filter high pass filter band stop filter

Question 5.5. (TCO 6) The band pass/band stop filter has _____ cut off frequencies (Points : 5)

2 1 3 Has no cut off frequencies

Question 6.6. (TCO 7) We need to bring down the voltage from 1200 V to 120 V. The transformer turns ratio is ______. (Points : 5)

1:10 1:100 10:1 5:1

Question 7.7. (TCO 7) The role of a capacitor at the output of the bridge rectifier in an AC to DC converter is (Points : 5)

to regulate the DC voltage. for smoothing the ripple. to eliminate the transformer. to double up the DC voltage.

Question 8.8. (TCO 1) What does the number "10" in the description of the sine wave 10sin(100 t) represent? (Points : 5)

Question 9.9. (TCO 2) How do you find the total reactance of multiple capacitive reactances connected in series? (Points : 5)

Question 1.1. (TCO 3) What is the phase angle of a inductive susceptance? (Points : 5)

Question 2.2. (TCO 4) Can we calculate the inductor value given the circuit resonance frequency? If your answer is no, explain why. (Points : 5)

Question 3.3. (TCO 5) What is Kirchhoff's current law? (Points : 5)

Question 4.4. (TCO 6) A low pass filter has a cut-off frequency of 8 kHz and a high pass filter has a cut-off frequency of 5 kHz. These two circuits are connected back to back in cascade to form an input-output system. How does this combination work, band pass or band stop?(Points : 5)

Question 5.5. (TCO 7) Name the principal component that is used to regulate the DC voltage in a DC power supply unit. (Points : 10)

Question 6.6. (TCO 8) What is the turns ratio for an isolation transformer? (Points : 10)

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Final Exam - Page 4

Question 1.1. (TCOs 1,9) Describe the relationship between peak current, peak-to-peak current, and rms current. Include in the discussion which values can be demonstrated with the laboratory test equipment. (Points : 35)

Question 2.2. (TCO 2) Describe the operation of the series RC circuit. The discussion must address phase angle relationships of current and voltage. The answer must include the effect of source frequency on the voltage drops across the resistor and the capacitor at very low and very high frequency values. (Points : 40)

Question 3.3. (TCOs 6,9) Describe the characteristics of the series RC filter circuit with the output across the resistive component. Distinguish the pass and stop bands with reference to the cutoff frequency. Also, state what happens to the circuit complex impedance at the cutoff frequency. (Points : 35)

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