ALTERNATING CURRENT AND VOLTAGE QUIZ

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

16.54 V

5.93 V

1.65 V

10.60 V

TRUE ANSWER : ?
YOUR ANSWER : ?

The average half-cycle value of a sine wave with a 40 V peak is

6.37 V

14.14 V

25.48 V

50.96 V

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

2 ms

1.5 ms

3,000 s

0.0045 s

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 : ?

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

6.5 V

None of these

13 V

26 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 lags wave B by 15°.

Wave A leads wave B by 105°.

Wave A leads wave B by 15°.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

100 Hz

50 Hz

10 Hz

1,000 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is

indeterminable

40 Hz

100 Hz

400 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

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

cannot be determined

is 1%

is 30%

is 100%

TRUE ANSWER : ?
YOUR ANSWER : ?

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

30 V

6 V

35 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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