#### 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 points#### If the rms voltage drop across a 15 k resistor is 16 V, the peak current through the resistor is

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##### 2. Question

1 points#### 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

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##### 3. Question

1 points#### To produce an 800 Hz sine wave, a four-pole generator must be operated at

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##### 4. Question

1 points#### 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

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##### 5. Question

1 points#### A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

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##### 6. Question

1 points#### A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle

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##### 7. Question

1 points#### If the peak of a sine wave is 13 V, the peak-to-peak value is

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##### 8. Question

1 points#### A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

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##### 9. Question

1 points#### A signal with a 400 s period has a frequency of

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##### 10. Question

1 points#### A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

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##### 11. Question

1 points#### The average value of a 12 V peak sine wave over one complete cycle is

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##### 12. Question

1 points#### When a sine wave has a frequency of 100 Hz in 12 s it goes through

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##### 13. Question

1 points#### A sawtooth wave has a period of 10 ms. Its frequency is

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##### 14. Question

1 points#### 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

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##### 15. Question

1 points#### 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?

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##### 16. Question

1 points#### A phasor represents

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##### 17. Question

1 points#### A 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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##### 18. Question

1 points#### A 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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##### 19. Question

1 points#### The average half-cycle 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 points#### In both induction and synchronous ac motors

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##### 2. Question

1 points#### Most practical alternators generate electricity from

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##### 3. Question

1 points#### A half-cycle average voltage of 12 V is equal to what rms voltage?

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##### 4. Question

1 points#### What is the instantaneous peak voltage at 250° on a 6 V peak sine wave?

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##### 5. Question

1 points#### A rectangular wave that has a duty cycle of 50% could be called a

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##### 6. Question

1 points#### The effective value of a sine wave is equal to

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##### 7. Question

1 points#### What is the fourth harmonic of a fundamental frequency of 400 Hz?

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##### 8. Question

1 points#### A single-phase induction motor

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##### 9. Question

1 points#### What is the average voltage when a rectangular wave’s base line voltage is 20 V, its peak-to-peak voltage is 50 V, and its duty cycle is 20%?

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