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Alternating Current and Voltage

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

14.14 V
25.48 V
50.96 V
6.37 V

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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

100%
50%
25%
1%

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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 15°.
Wave A leads wave B by 105°.
Wave A lags wave B by 15°.
Wave A lags wave B by 105°.

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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
12 cycles
1,200 cycles

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Alternating Current and Voltage
If the rms voltage drop across a 15 k resistor is 16 V, the peak current through the resistor is

1.5 mA
10 mA
15 mA
1 mA

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