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: The RMS value of AC current is
A) Double peak
B) 0.5 of peak
C) 0.707 of peak
D) Equal to peak
✅ Correct Answer: C
Explanation: RMS (Root Mean Square) value is 0.707 × peak value for sine wave AC.
Q: A fuse protects against
A) Reverse polarity
B) Under voltage
C) Overcurrent
D) High power factor
✅ Correct Answer: C
Explanation: Fuses break the circuit when excessive current flows.
Q: A zener diode is mainly used for
A) Switching
B) Rectification
C) Current amplification
D) Voltage regulation
✅ Correct Answer: D
Explanation: Zener diodes regulate voltage in circuits.
Q: Inductors oppose changes in
A) Current
B) Resistance
C) Frequency
D) Voltage
✅ Correct Answer: A
Explanation: Inductors resist changes in current due to their magnetic field.
Q: Alternating current changes direction
A) Constantly
B) Never
C) Once per second
D) Randomly
✅ Correct Answer: A
Explanation: AC alternates direction periodically based on its frequency.