ALTERNATING CURRENT AND VOLTAGE QUIZ

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

18 kHz

1.3 MHz

25 kHz

12 kHz

TRUE ANSWER : ?
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

40°

None of these

0°

45°

TRUE ANSWER : ?
YOUR ANSWER : ?

How many degrees are there in /3 rad?

60°

6°

180°

27°

TRUE ANSWER : ?
YOUR ANSWER : ?

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

2.66 V

18.8 V

26.6 V

4 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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

26 V

None of these

6.5 V

13 V

TRUE ANSWER : ?
YOUR ANSWER : ?

A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

50%

25%

1%

100%

TRUE ANSWER : ?
YOUR ANSWER : ?

A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of

0.0045 s

1.5 ms

2 ms

3,000 s

TRUE ANSWER : ?
YOUR ANSWER : ?

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

6.37 V

7.64 V

1.27 V

0 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 lags wave B by 105°.

Wave A leads wave B by 105°.

Wave A leads wave B by 15°.

Wave A lags wave B by 15°.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

100 s

4 s

20 s

2 s

TRUE ANSWER : ?
YOUR ANSWER : ?

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