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Alternating Current and Voltage

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

800 rps
1,600 rps
200 rps
400 rps

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

is 30%
is 1%
is 100%
cannot be determined

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Alternating Current and Voltage
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

0°
None of these
45°
40°

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Alternating Current and Voltage
A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

16 mA
39.6 mA
45.12 mA
22.6 mA

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Alternating Current and Voltage
A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

50%
1%
25%
100%

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Alternating Current and Voltage
A phasor represents

the magnitude of a quantity
the width of a quantity
the magnitude and a quantity direction
the phase angle

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