ALTERNATING CURRENT AND VOLTAGE QUIZ

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 : ?
YOUR ANSWER : ?

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

50 kHz

33.33 kHz

5 kHz

500 kHz

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 : ?

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

6.37 V

14.14 V

50.96 V

25.48 V

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

2.66 V

18.8 V

26.6 V

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

4 V

1.6 V

11 V

4.6 V

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 100%

is 30%

TRUE ANSWER : ?
YOUR ANSWER : ?

How many degrees are there in /3 rad?

180°

27°

6°

60°

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

0°

40°

None of these

45°

TRUE ANSWER : ?
YOUR ANSWER : ?

A phasor represents

the width of a quantity

the magnitude of a quantity

the magnitude and a quantity direction

the phase angle

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