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: Transistor is used as a
A) Filter
B) Switch or amplifier
C) Rectifier
D) Sensor
✅ Correct Answer: B
Explanation: Transistors are fundamental components in switching and amplification.
Q: Electrolysis is a process related to
A) Thermal conduction
B) Magnetism
C) Electrical conduction
D) Chemical decomposition
✅ Correct Answer: D
Explanation: Electrolysis decomposes compounds using electricity.
Q: In star connection, line voltage is
A) 3 × phase voltage
B) √3 × phase voltage
C) Half phase voltage
D) Equal to phase voltage
✅ Correct Answer: B
Explanation: In a star connection, line voltage = √3 × phase voltage.
Q: An ideal voltage source has
A) High resistance
B) Zero voltage
C) Infinite current
D) Zero resistance
✅ Correct Answer: D
Explanation: Ideal voltage sources have zero internal resistance.
Q: Power in a three-phase system is calculated using
A) P = I^2 × R
B) P = √3 × VL × IL × pf
C) P = V × pf
D) P = VL × IL
✅ Correct Answer: B
Explanation: Total power in 3-phase systems is calculated with the given formula.