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: A semiconductor has conductivity between that of a
A) Transistor and battery
B) Wire and capacitor
C) Resistor and diode
D) Conductor and insulator
✅ Correct Answer: D
Explanation: Semiconductors conduct better than insulators but worse than conductors.
Q: Efficiency of a transformer is maximum when
A) Copper loss = iron loss
B) Load is zero
C) No load
D) Full load
✅ Correct Answer: A
Explanation: Transformer efficiency is best when copper and iron losses are equal.
Q: Lightning arrestors are used to protect equipment from
A) Overload
B) Low voltage
C) High voltage surges
D) Mechanical damage
✅ Correct Answer: C
Explanation: They divert surge voltages from lightning safely to ground.
Q: The dielectric strength of a material refers to its
A) Magnetic property
B) Resistance
C) Voltage withstanding ability
D) Current rating
✅ Correct Answer: C
Explanation: Dielectric strength is the maximum electric field a material can endure without breakdown.
Q: How does an inductor react to a sudden change in current
A) It acts like a resistor
B) It resists the change
C) It stores charge
D) It accelerates current flow
✅ Correct Answer: B
Explanation: Inductors oppose sudden current changes due to their stored magnetic field