ALTERNATING CURRENT AND VOLTAGE QUIZ

A signal with a 400 s period has a frequency of

25,000 Hz

250 Hz

2,500 Hz

400 Hz

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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°

0°

45°

None of these

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A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is

1.6 V

11 V

4.6 V

4 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 lags wave B by 15°.

Wave A lags wave B by 105°.

Wave A leads wave B by 15°.

Wave A leads wave B by 105°.

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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

10.60 V

1.65 V

16.54 V

5.93 V

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How many degrees are there in /3 rad?

27°

6°

180°

60°

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

50 Hz

10 Hz

100 Hz

1,000 Hz

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

20 s

2 s

4 s

100 s

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If the peak of a sine wave is 13 V, the peak-to-peak value is

26 V

6.5 V

None of these

13 V

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If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is

8 V

54.4 V

7.07 V

5.44 V

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