Explore topic-wise MCQs in Electrical Engineering.

This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

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

A. Is 1%
B. Is 30%
C. Is 100%
D. Cannot be determined
Answer» C. Is 100%
Discussion
2.

Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.~!

A. True
B. False
Answer» C.
Discussion
3.

How many degrees are there in p/3 rad?%!

A. 6°
B. 60°
C. 180°
D. 27°
Answer» C. 180¬¨‚àû
Discussion
4.

The unit of frequency is the hertz.%!

A. True
B. False
Answer» B. False
Discussion
5.

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

A. True
B. False
Answer» B. False
Discussion
6.

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
Answer» C. 10 mA
Discussion
7.

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
Answer» C.
Discussion
8.

A signal with a 400 µs period has a frequency of%!

A. 250 Hz
B. 2,500 Hz
C. 25,000 Hz
D. 400 Hz
Answer» C. 25,000 Hz
Discussion
9.

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
Answer» B. 1.27 V
Discussion
10.

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

A. 25.48 V
B. 6.37 V
C. 14.14 V
D. 50.96 V
Answer» B. 6.37 V
Discussion
11.

The instantaneous value is the voltage or current value of a waveform at its peak.%!

A. True
B. False
Answer» C.
Discussion
12.

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
Answer» D. 1,000 Hz
Discussion
13.

Amplitude is the maximum value of a voltage or current.%!

A. True
B. False
Answer» B. False
Discussion
14.

A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of%!

A. 0.0045 s
B. 2 ms
C. 1.5 ms
D. 3,000 µs
Answer» B. 2 ms
Discussion
15.

The designation rms means repetitions measured per second.%!

A. True
B. False
Answer» C.
Discussion
16.

A ramp is the type of waveform characterized by a non-linear increase or decrease in voltage or current.%!

A. True
B. False
Answer» C.
Discussion
17.

A 1 kHz signal has a period of 1 ms.%!

A. True
B. False
Answer» B. False
Discussion
18.

Periodic is characterized by a repetition at fixed time intervals.%!

A. True
B. False
Answer» B. False
Discussion
19.

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?%!

A. Wave A leads wave B by 15°
B. Wave A lags wave B by 15°
C. Wave A leads wave B by 105°
D. Wave A lags wave B by 105°
Answer» B. Wave A lags wave B by 15¬¨‚àû
Discussion
20.

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%!

A. 16.54 V
B. 1.65 V
C. 10.60 V
D. 5.93 V
Answer» B. 1.65 V
Discussion
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
Answer» C. 500 kHz
Discussion
22.

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

A. 200 rps
B. 400 rps
C. 800 rps
D. 1,600 rps
Answer» C. 800 rps
Discussion
23.

Average value of a sine wave is 0.707 times the peak value.%!

A. True
B. False
Answer» C.
Discussion
24.

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%!

A. 0°
B. 45°
C. 40°
D. None of the above
Answer» D. None of the above
Discussion
25.

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%!

A. 6 V
B. 30 V
C. 35 V
D. 0 V
Answer» D. 0 V
Discussion
26.

The length of a phasor represents the amplitude.%!

A. True
B. False
Answer» B. False
Discussion
27.

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%!

A. 40 Hz
B. 100 Hz
C. 400 Hz
D. Indeterminable
Answer» D. Indeterminable
Discussion
28.

A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is%!

A. 25%
B. 50%
C. 1%
D. 100%
Answer» B. 50%
Discussion
29.

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

A. 6.5 V
B. 13 V
C. 26 V
D. None of the above
Answer» D. None of the above
Discussion
30.

If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is%!

A. 4 V
B. 18.8 V
C. 26.6 V
D. 2.66 V
Answer» D. 2.66 V
Discussion
31.

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

A. 45.12 mA
B. 16 mA
C. 39.6 mA
D. 22.6 mA
Answer» D. 22.6 mA
Discussion
32.

If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is%!

A. 5.44 V
B. 54.4 V
C. 7.07 V
D. 8 V
Answer» C. 7.07 V
Discussion
33.

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

A. 4 V
B. 4.6 V
C. 1.6 V
D. 11 V
Answer» B. 4.6 V
Discussion
34.

*/*_A phasor represents?

A. The magnitude and a quantity direction
B. The width of a quantity
C. The phase angle
D. The magnitude of a quantity
Answer» B. The width of a quantity
Discussion
35.

%_A phasor represents_%

A. The magnitude and a quantity direction
B. The width of a quantity
C. The phase angle
D. The magnitude of a quantity
Answer» B. The width of a quantity
Discussion
36.

__If a sine wave goes through 10 cycles in 20 µs, the period is__

A. 20 µs
B. 4 µs
C. 2 µs
D. 100 µs
Answer» D. 100 ¬¨¬µs
Discussion
37.

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

A. 1/100 cycle
B. 12 cycles
C. 120 cycles
D. 1,200 cycles
Answer» E.
Discussion