Electrical Engineering MCQs
Electrical Engineering MCQs are essential for aspirants preparing for engineering exams and job tests conducted by PPSC, FPSC, NTS, and other testing services. This section includes questions from power systems, basic electronics, circuit analysis, machines, measurements, and electromagnetism. Whether you're revising for an academic test or preparing for professional assessments, these multiple-choice questions are tailored to cover the entire Electrical Engineering syllabus. The content is designed to reflect current trends in competitive exams and industry requirements. Practicing these MCQs will help you strengthen your concepts, improve time management, and increase your chances of scoring high in electrical engineering exams in Pakistan.
Q: The unit of electrical resistance
A) Ampere
B) Watt
C) Ohm
D) Volt
✅ Correct Answer: C
Explanation: Resistance is measured in ohms, denoted by the Greek letter Ω.
Q: A transformer primarily functions to
A) Change power
B) Change resistance
C) Change frequency
D) Change voltage
✅ Correct Answer: D
Explanation: Transformers are used to increase or decrease voltage levels in AC circuits.
Q: Ohm’s law relates
A) Power, current, resistance
B) Voltage, current, resistance
C) Voltage, power, capacitance
D) Current, resistance, capacitance
✅ Correct Answer: B
Explanation: Ohm’s Law states V = IR, relating voltage, current, and resistance.
Q: Kirchhoff’s voltage law is based on the principle of
A) Mass conservation
B) Power conservation
C) Energy conservation
D) Charge conservation
✅ Correct Answer: C
Explanation: It states that the total voltage around a closed loop equals zero, reflecting energy conservation.
Q: The function of a diode in a circuit is to
A) Control resistance
B) Allow current in one direction
C) Block current
D) Amplify signals
✅ Correct Answer: B
Explanation: A diode allows current flow in one direction only, acting as a rectifier.
Q: A capacitor stores energy in the form of
A) Electric field
B) Radiation
C) Magnetic field
D) Heat
✅ Correct Answer: A
Explanation: Capacitors store potential energy in their electric field.
Q: In AC analysis, impedance replaces
A) Voltage
B) Capacitance
C) Resistance
D) Inductance
✅ Correct Answer: C
Explanation: Impedance is the AC equivalent of resistance, combining resistive and reactive effects.
Q: Capacitance is measured in
A) Henry
B) Ohm
C) Volt
D) Farad
✅ Correct Answer: D
Explanation: The SI unit of capacitance is the farad (F).
Q: The purpose of grounding in an electrical system is to
A) Prevent shock
B) Increase voltage
C) Reduce power
D) Store energy
✅ Correct Answer: A
Explanation: Grounding ensures safety by preventing electrical shock.
Q: The frequency of standard AC supply in Pakistan is
A) 60 Hz
B) 50 Hz
C) 100 Hz
D) 25 Hz
✅ Correct Answer: B
Explanation: Pakistan follows the 50 Hz frequency standard for AC power.