ALTERNATING CURRENT AND VOLTAGE QUIZ

A signal with a 400 s period has a frequency of

250 Hz

400 Hz

25,000 Hz

2,500 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

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

2 s

100 s

20 s

4 s

TRUE ANSWER : ?
YOUR ANSWER : ?

How many degrees are there in /3 rad?

27°

6°

180°

60°

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

26 V

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

2 ms

3,000 s

0.0045 s

1.5 ms

TRUE ANSWER : ?
YOUR ANSWER : ?

If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is

8 V

7.07 V

54.4 V

5.44 V

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

16.54 V

10.60 V

1.65 V

TRUE ANSWER : ?
YOUR ANSWER : ?

When a sine wave has a frequency of 100 Hz in 12 s it goes through

120 cycles

1/100 cycle

1,200 cycles

12 cycles

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

15 mA

1.5 mA

TRUE ANSWER : ?
YOUR ANSWER : ?

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