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Alternating Current and Voltage

Alternating Current and Voltage
A phasor represents

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

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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 1%
is 100%
cannot be determined
is 30%

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Alternating Current and Voltage
A sawtooth wave has a period of 10 ms. Its frequency is

50 Hz
1,000 Hz
100 Hz
10 Hz

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Alternating Current and Voltage
A signal with a 400 s period has a frequency of

400 Hz
25,000 Hz
2,500 Hz
250 Hz

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Alternating Current and Voltage
When a sine wave has a frequency of 100 Hz in 12 s it goes through

1/100 cycle
120 cycles
1,200 cycles
12 cycles

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Alternating Current and Voltage
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 leads wave B by 105°.
Wave A leads wave B by 15°.
Wave A lags wave B by 15°.
Wave A lags wave B by 105°.

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