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

25.48 V

14.14 V

50.96 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 15°.

Wave A leads wave B by 105°.

Wave A lags wave B by 15°.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

50 kHz

33.33 kHz

500 kHz

5 kHz

TRUE ANSWER : ?
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The average value of a 12 V peak sine wave over one complete cycle is

1.27 V

7.64 V

0 V

6.37 V

TRUE ANSWER : ?
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A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

12 kHz

1.3 MHz

18 kHz

25 kHz

TRUE ANSWER : ?
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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

40 Hz

100 Hz

indeterminable

400 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

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

120 cycles

12 cycles

1/100 cycle

1,200 cycles

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

1 mA

10 mA

1.5 mA

15 mA

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

5.44 V

7.07 V

54.4 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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