ALTERNATING CURRENT AND VOLTAGE QUIZ

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°

45°

40°

None of these

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

16 mA

22.6 mA

39.6 mA

45.12 mA

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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

54.4 V

5.44 V

8 V

7.07 V

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

2 s

20 s

4 s

100 s

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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

4 V

4.6 V

1.6 V

11 V

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

1,600 rps

400 rps

200 rps

800 rps

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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

5.93 V

1.65 V

10.60 V

16.54 V

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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

0 V

35 V

30 V

6 V

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A phasor represents

the phase angle

the magnitude of a quantity

the width of a quantity

the magnitude and a quantity direction

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

10 mA

1.5 mA

15 mA

1 mA

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