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: In a series RLC circuit, resonance occurs when
A) R = 0
B) XL = XC
C) R = XL
D) R = XC
✅ Correct Answer: B
Explanation: Resonance occurs when inductive and capacitive reactances are equal and cancel out
Q: The function of a Zener diode is to
A) Filter noise
B) Rectify current
C) Amplify signal
D) Regulate voltage
✅ Correct Answer: D
Explanation: Zener diodes are used in reverse bias for voltage regulation
Q: Superposition theorem applies to
A) Non-linear circuits
B) All circuits
C) Magnetic circuits
D) Linear circuits
✅ Correct Answer: D
Explanation: Superposition is valid only for linear networks with multiple sources
Q: Current through a capacitor
A) Lags voltage
B) Is always zero
C) Equals voltage
D) Leads voltage
✅ Correct Answer: D
Explanation: In capacitors, current leads voltage by 90°
Q: A synchronous motor runs at
A) Lower than synchronous speed
B) Variable speed
C) Zero speed
D) Constant speed
✅ Correct Answer: D
Explanation: Synchronous motors maintain a constant speed regardless of load