ALTERNATING CURRENT AND VOLTAGE QUIZ

A phasor represents

the magnitude of a quantity

the magnitude and a quantity direction

the width of a quantity

the phase angle

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

5 kHz

33.33 kHz

50 kHz

500 kHz

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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

40°

45°

None of these

0°

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

12 cycles

1/100 cycle

1,200 cycles

120 cycles

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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

400 Hz

40 Hz

indeterminable

100 Hz

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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

16.54 V

1.65 V

5.93 V

10.60 V

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

1,000 Hz

50 Hz

10 Hz

100 Hz

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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 15°.

Wave A lags wave B by 105°.

Wave A leads wave B by 105°.

Wave A leads wave B by 15°.

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

100 s

4 s

20 s

2 s

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

is 1%

cannot be determined

is 100%

is 30%

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