The Following Section consists of Multiple Choice Questions on Alternating Current and Voltage.
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Alternating Current and Voltage MCQ
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Question 1 of 19
1. Question
1 pointsIf the rms voltage drop across a 15 k resistor is 16 V, the peak current through the resistor is
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Question 2 of 19
2. Question
1 pointsThe conductive loop on the rotor of a simple twopole, singlephase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is
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Question 3 of 19
3. Question
1 pointsTo produce an 800 Hz sine wave, a fourpole generator must be operated at
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Question 4 of 19
4. Question
1 pointsOne sine wave has a positivegoing zero crossing at 15° and another sine wave has a positivegoing zero crossing at 55°. The phase angle between the two waveforms is
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Question 5 of 19
5. Question
1 pointsA pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
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Question 6 of 19
6. Question
1 pointsA 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle
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Question 7 of 19
7. Question
1 pointsIf the peak of a sine wave is 13 V, the peaktopeak value is
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Question 8 of 19
8. Question
1 pointsA sinusoidal current has an rms value of 14 mA. The peaktopeak value is
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Question 9 of 19
9. Question
1 pointsA signal with a 400 s period has a frequency of
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Question 10 of 19
10. Question
1 pointsA sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
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Question 11 of 19
11. Question
1 pointsThe average value of a 12 V peak sine wave over one complete cycle is
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Question 12 of 19
12. Question
1 pointsWhen a sine wave has a frequency of 100 Hz in 12 s it goes through
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Question 13 of 19
13. Question
1 pointsA sawtooth wave has a period of 10 ms. Its frequency is
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Question 14 of 19
14. Question
1 pointsTwo 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
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Question 15 of 19
15. Question
1 pointsSine wave A has a positivegoing zero crossing at 45°. Sine wave B has a positivegoing zero crossing at 60°. Which of the following statements is true?
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Question 16 of 19
16. Question
1 pointsA phasor represents
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Question 17 of 19
17. Question
1 pointsA waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is
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Question 18 of 19
18. Question
1 pointsA sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is
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Question 19 of 19
19. Question
1 pointsThe average halfcycle value of a sine wave with a 40 V peak is
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Alternating Current and Voltage MCQ 2
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Question 1 of 9
1. Question
1 pointsIn both induction and synchronous ac motors
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Question 2 of 9
2. Question
1 pointsMost practical alternators generate electricity from
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Question 3 of 9
3. Question
1 pointsA halfcycle average voltage of 12 V is equal to what rms voltage?
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Question 4 of 9
4. Question
1 pointsWhat is the instantaneous peak voltage at 250° on a 6 V peak sine wave?
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Question 5 of 9
5. Question
1 pointsA rectangular wave that has a duty cycle of 50% could be called a
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Question 6 of 9
6. Question
1 pointsThe effective value of a sine wave is equal to
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Question 7 of 9
7. Question
1 pointsWhat is the fourth harmonic of a fundamental frequency of 400 Hz?
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Question 8 of 9
8. Question
1 pointsA singlephase induction motor
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Question 9 of 9
9. Question
1 pointsWhat is the average voltage when a rectangular wave’s base line voltage is 20 V, its peaktopeak voltage is 50 V, and its duty cycle is 20%?
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