Alternating Current and Voltage Practice Exam - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. To produce an 800 Hz sine wave, a four-pole generator must be operated at
(A) 200 rps
(B) 400 rps
(C) 800 rps
(D) 1,600 rps

2. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
(A) 25%
(B) 50%
(C) 1%
(D) 100%

3. The angular position of a phasor represents the angle of the sine wave with respect to a reference.
(A) True
(B) False

4. If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is
(A) 15 mA
(B) 1.5 mA
(C) 10 mA
(D) 1 mA

5. The instantaneous value is the voltage or current value of a waveform at its peak.
(A) True
(B) False

6. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is
(A) 0°
(B) 45°
(C) 40°
(D) None of the above

7. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.
(A) True
(B) False

8. If the peak of a sine wave is 13 V, the peak-to-peak value is
(A) 6.5 V
(B) 13 V
(C) 26 V
(D) None of the above

9. Periodic is characterized by a repetition at fixed time intervals.
(A) True
(B) False

10. When a sine wave has a frequency of 100 Hz in 12 s it goes through
(A) 1/100 cycle
(B) 12 cycles
(C) 120 cycles
(D) 1,200 cycles

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