ALTERNATING CURRENT AND VOLTAGE QUIZ

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 leads wave B by 105°.

Wave A leads wave B by 15°.

Wave A lags wave B by 15°.

Wave A lags wave B by 105°.

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

4 V

26.6 V

18.8 V

2.66 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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

120 cycles

1,200 cycles

1/100 cycle

12 cycles

TRUE ANSWER : ?
YOUR ANSWER : ?

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

16 mA

45.12 mA

22.6 mA

39.6 mA

TRUE ANSWER : ?
YOUR ANSWER : ?

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

18 kHz

12 kHz

1.3 MHz

25 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is

1.6 V

4.6 V

4 V

11 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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

33.33 kHz

5 kHz

50 kHz

500 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

None of these

40°

45°

0°

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

7.07 V

54.4 V

5.44 V

8 V

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

35 V

6 V

30 V

0 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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