ALTERNATING CURRENT AND VOLTAGE QUIZ

A phasor represents

the magnitude and a quantity direction

the magnitude of a quantity

the phase angle

the width of a quantity

TRUE ANSWER : ?
YOUR ANSWER : ?

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

10.60 V

1.65 V

16.54 V

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YOUR ANSWER : ?

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°

None of these

40°

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YOUR ANSWER : ?

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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YOUR ANSWER : ?

A square wave has a period of 60 s. The first odd harmonic is

33.33 kHz

5 kHz

500 kHz

50 kHz

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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

TRUE ANSWER : ?
YOUR ANSWER : ?

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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YOUR ANSWER : ?

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 leads wave B by 15°.

Wave A lags wave B by 105°.

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YOUR ANSWER : ?

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

39.6 mA

45.12 mA

22.6 mA

16 mA

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YOUR ANSWER : ?

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