ALTERNATING CURRENT AND VOLTAGE QUIZ

If a sine wave goes through 10 cycles in 20 s, the period is

2 s

4 s

20 s

100 s

TRUE ANSWER : ?
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A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle

cannot be determined

is 30%

is 1%

is 100%

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

100 Hz

10 Hz

50 Hz

1,000 Hz

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A square wave has a period of 60 s. The first odd harmonic is

5 kHz

33.33 kHz

500 kHz

50 kHz

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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

5.93 V

16.54 V

1.65 V

10.60 V

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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?

Wave A lags wave B by 105°.

Wave A leads wave B by 105°.

Wave A lags wave B by 15°.

Wave A leads wave B by 15°.

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

800 rps

200 rps

1,600 rps

400 rps

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The average half-cycle value of a sine wave with a 40 V peak is

50.96 V

6.37 V

25.48 V

14.14 V

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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

40 Hz

100 Hz

indeterminable

400 Hz

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

0 V

1.27 V

7.64 V

6.37 V

TRUE ANSWER : ?
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