ALTERNATING CURRENT AND VOLTAGE QUIZ

A phasor represents

the phase angle

the width of a quantity

the magnitude of a quantity

the magnitude and a quantity direction

TRUE ANSWER : ?
YOUR ANSWER : ?

A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is

35 V

6 V

30 V

0 V

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YOUR ANSWER : ?

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

6.37 V

14.14 V

25.48 V

50.96 V

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

0 V

7.64 V

1.27 V

6.37 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 leads wave B by 105°.

Wave A lags wave B by 15°.

Wave A lags wave B by 105°.

Wave A leads wave B by 15°.

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

is 30%

is 100%

is 1%

cannot be determined

TRUE ANSWER : ?
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If the rms current through a 4.7 k resistor is 4 mA, the peak voltage drop across the resistor is

18.8 V

2.66 V

26.6 V

4 V

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

4 s

20 s

2 s

100 s

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A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

12 kHz

18 kHz

25 kHz

1.3 MHz

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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

None of these

40°

0°

45°

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