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 purely inductive or capacitive circuit is
A) One
B) Unity
C) Negative
D) Zero
✅ Correct Answer: D
Explanation: Power factor is zero in such circuits as current and voltage are 90° out of phase
Q: The SI unit of magnetic flux density is
A) Weber
B) Henry
C) Farad
D) Tesla
✅ Correct Answer: D
Explanation: Tesla is the standard unit of magnetic flux density (B)
Q: A triac is used to
A) Rectify DC
B) Control AC power
C) Store data
D) Detect voltage
✅ Correct Answer: B
Explanation: Triacs control power flow in AC circuits, often used in dimmers and motor speed controls
Q: A diode allows current flow
A) Only under DC
B) In one direction
C) In both directions
D) Only under AC
✅ Correct Answer: B
Explanation: Diodes conduct current in one direction and block it in the reverse direction
Q: Transformer efficiency increases with
A) Higher temperature
B) Higher frequency
C) Smaller size
D) Lower losses
✅ Correct Answer: D
Explanation: Reducing core and copper losses improves transformer efficiency