ALTERNATING CURRENT AND VOLTAGE QUIZ

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

is 100%

is 30%

is 1%

cannot be determined

TRUE ANSWER : ?
YOUR ANSWER : ?

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

6.5 V

13 V

26 V

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

800 rps

200 rps

1,600 rps

400 rps

TRUE ANSWER : ?
YOUR ANSWER : ?

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

18 kHz

12 kHz

25 kHz

1.3 MHz

TRUE ANSWER : ?
YOUR ANSWER : ?

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

10 mA

1 mA

1.5 mA

15 mA

TRUE ANSWER : ?
YOUR ANSWER : ?

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

33.33 kHz

50 kHz

5 kHz

500 kHz

TRUE ANSWER : ?
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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

45°

0°

None of these

40°

TRUE ANSWER : ?
YOUR ANSWER : ?

A phasor represents

the magnitude and a quantity direction

the phase angle

the magnitude of a quantity

the width of a quantity

TRUE ANSWER : ?
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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

16.54 V

10.60 V

TRUE ANSWER : ?
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 leads wave B by 15°.

Wave A lags wave B by 15°.

Wave A lags wave B by 105°.

TRUE ANSWER : ?
YOUR ANSWER : ?

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