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Electrical Engineering Mcqs – MCQs

110 questions. Click to practice.

Correct options are highlighted when revealed.

1.In a series R-C circuit, what is the predominant behavior observed at extremely low frequencies?

2.What is the standard frequency of the household electrical power supply in Pakistan?

3.Why is a floating neutral considered problematic in a three-phase power system?

4.If the RMS value of a half-wave rectified sine wave is 200 V, what would be the RMS value of the corresponding full-wave rectified AC signal?

5.Among the following waveforms, which one exhibits the greatest peak factor?

6.Which of the following methods effectively increases the inductance of a coil?

7.Which pair of phosphors exhibits a 180° phase difference in VL, VC, and VR signals?

8.What is the root mean square (r.m.s.) value of a pure cosine wave relative to its peak amplitude?

9.How do series and parallel resonance in an L-C circuit differ in terms of the source resistance required for a pronounced effect?

10.What does the frequency of an alternating current represent?

11.Which of the following quantities is not measured in ohms?

12.What is the equation of a 50 Hz sinusoidal current wave with an rms value of 60 A?

13.What is the power factor value in a direct current (DC) circuit?

14.In a circuit consisting solely of an inductor, what happens to the current if the frequency of the supply is decreased to half its original value?

15.In a circuit containing only a capacitor, what happens to the current if the supply frequency is decreased to half its original value?

16.An alternating voltage is applied across a 3.5-ohm pure resistor connected in parallel with a pure inductor having an impedance of 3.5 ohms. What can be said about the currents through the resistor and the inductor?

17.What is the term for the product of apparent power and the cosine of the phase difference between voltage and current in an electrical circuit?

18.A pure capacitor is connected to an alternating current (AC) source and is said to consume 50 watts of power. What is the reason for this observation?

19.What type of electrical power is transformed into heat when alternating current flows through an ohmic resistor?

20.A three-phase generator induces an alternating voltage with an RMS value of 220 V in each of its three coils. What voltage reading will the voltmeters display?