ALTERNATING CURRENT AND VOLTAGE QUIZ

A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

16 mA

39.6 mA

22.6 mA

45.12 mA

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

1.65 V

16.54 V

5.93 V

10.60 V

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

400 Hz

indeterminable

100 Hz

40 Hz

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 15°.

Wave A leads wave B by 15°.

Wave A leads wave B by 105°.

Wave A lags wave B by 105°.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

13 V

None of these

6.5 V

26 V

TRUE ANSWER : ?
YOUR ANSWER : ?

A phasor represents

the magnitude and a quantity direction

the magnitude of a quantity

the width of a quantity

the phase angle

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

6 V

35 V

30 V

0 V

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 : ?

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

200 rps

400 rps

800 rps

1,600 rps

TRUE ANSWER : ?
YOUR ANSWER : ?

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

is 1%

cannot be determined

is 30%

is 100%

TRUE ANSWER : ?
YOUR ANSWER : ?

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