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Alternating Current and Voltage MCQs
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Alternating Current and Voltage MCQs
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25 Questions

1. Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.
2. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?
3. To produce an 800 Hz sine wave, a four-pole generator must be operated at
4. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.
5. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is
6. If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is
7. A 20 kHz pulse waveform consists of pulses that are 15 μs wide. The duty cycle
8. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
9. Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is
10. If a sine wave goes through 10 cycles in 20 μs, the period is
11. A ramp is the type of waveform characterized by a non-linear increase or decrease in voltage or current.
12. The designation rms means repetitions measured per second.
13. The average half-cycle value of a sine wave with a 40 V peak is
14. A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is
15. When a sine wave has a frequency of 100 Hz in 12 s it goes through
16. The unit of frequency is the hertz.
17. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
18. The length of a phasor represents the amplitude.
19. A saw-tooth wave has a period of 10 ms. Its frequency is
20. A 1 kHz signal has a period of 1 ms.
21. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
22. The angular position of a phasor represents the angle of the sine wave with respect to a reference.
23. Periodic is characterized by a repetition at fixed time intervals.
24. Average value of a sine wave is 0.707 times the peak value.
25. If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is

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