Electrical Engineering MCQs
Electrical Engineering MCQs for PPSC, FPSC, NTS, and competitive exams cover power systems, electronics, circuits, machines, and electromagnetism. Practice these questions to master concepts, improve time management, and excel in electrical engineering tests in Pakistan.
Q: Power factor in an ideal purely resistive circuit is
A) Negative
B) Zero
C) One
D) Infinity
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Correct Answer: C
Explanation: In purely resistive circuits, voltage and current are in phase, so power factor is 1.
Q: Inductive reactance increases with
A) Increasing resistance
B) Decreasing frequency
C) Increasing frequency
D) Constant voltage
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Correct Answer: C
Explanation: Inductive reactance XL = 2ฯfL increases as frequency increases.
Q: A three-phase system is preferred over single-phase because it
A) Has less current
B) Provides constant power
C) Requires fewer wires
D) Is simpler
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Correct Answer: B
Explanation: Three-phase power is more efficient and provides constant power delivery.
Q: Current in a conductor is due to
A) Electron flow
B) Hole movement
C) Neutron movement
D) Proton flow
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Correct Answer: A
Explanation: Free electrons are responsible for current in conductors.
Q: Power in a resistive circuit is calculated as
A) V/I
B) VI
C) V^2/I
D) I^2/R
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Correct Answer: B
Explanation: Power is voltage multiplied by current: P = VI.