Alternating Current And Voltage MCQ Questions & Answers | Electrical Engineering

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21.
A square wave has a period of 60 µs. The first odd harmonic is

A. 5 kHz

B. 50 kHz

C. 500 kHz

D. 33.33 kHz

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22.
Periodic is characterized by a repetition at fixed time intervals.

A. True

B. False

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23.
The designation rms means repetitions measured per second.

A. True

B. False

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24.
A saw-tooth wave has a period of 10 ms. Its frequency is

A. 10 Hz

B. 50 Hz

C. 100 Hz

D. 1,000 Hz

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25.
The average value of a 12 V peak sine wave over one complete cycle is

A. 0 V

B. 1.27 V

C. 7.64 V

D. 6.37 V

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26.
The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

A. True

B. False

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27.
If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is

A. 15 mA

B. 1.5 mA

C. 10 mA

D. 1 mA

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28.
The angular position of a phasor represents the angle of the sine wave with respect to a reference.

A. True

B. False

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29.
The unit of frequency is the hertz.

A. True

B. False

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30.
How many degrees are there in p/3 rad?

A. 6°

B. 60°

C. 180°

D. 27°

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