PAST PAPER Assistant Electric Inspector PPSC [SOLVED]

1. : What is the unit of electrical resistance?
(A) Ohm
(B) Watt
(C) Volt
(D) Ampere

2. : Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
(A) Kirchhoff’s Law
(B) Ohm’s Law
(C) Faraday’s Law
(D) Ampere’s Law

3. : In a series circuit, the total resistance is:
(A) Equal to the sum of individual resistances
(B) The product of individual resistances
(C) The reciprocal of the sum of reciprocals
(D) Zero

4. : What is the main function of a transformer?
(A) To increase voltage
(B) To generate power
(C) To decrease resistance
(D) To increase current

5. : What is the power factor of an ideal resistive circuit?
(A) 0
(B) 1
(C) 0.5
(D) ∞

6. : Which of the following is a semiconductor?
(A) Gold
(B) Silicon
(C) Copper
(D) Aluminum

7. : The magnetic field around a current-carrying conductor can be determined by:
(A) Right-hand rule
(B) Left-hand rule
(C) Biot–Savart law
(D) Ampere’s circuital law

8. : The basic unit of capacitance is:
(A) Farad
(B) Henry
(C) Ohm
(D) Volt

9. : What is the function of a diode?
(A) To convert AC to DC
(B) To amplify signals
(C) To store energy
(D) To measure current

10. : Which component is used to store electrical energy in an electric field?
(A) Inductor
(B) Capacitor
(C) Transformer
(D) Resistor

11. : The frequency of the AC supply in Pakistan is:
(A) 50 Hz
(B) 60 Hz
(C) 100 Hz
(D) 120 Hz

12. : What does the term “kVA” stand for?
(A) Kilo Volt Amperes
(B) Kilo Watt Amperes
(C) Kilo Volt Amperes Reactive
(D) Kilowatt Amperes

13. : Which device is used to measure electrical current?
(A) Ohmmeter
(B) Ammeter
(C) Voltmeter
(D) Wattmeter

14. : The total power in a parallel circuit is equal to:
(A) The sum of individual powers
(B) The sum of individual voltages
(C) The product of resistances
(D) The sum of currents

15. : What type of circuit is used to protect electrical circuits from overload?
(A) Inductor
(B) Transformer
(C) Capacitor
(D) Fuse

16. : The phenomenon of electromagnetic induction was discovered by:
(A) Nikola Tesla
(B) Michael Faraday
(C) James Clerk Maxwell
(D) Thomas Edison

17. : The primary function of an inductor is to:
(A) Store magnetic energy
(B) Store electrical energy
(C) Convert mechanical energy
(D) Generate heat

18. : The efficiency of an electric motor is defined as:
(A) Output power ÷ Input power
(B) Input power ÷ Output power
(C) Input – Output
(D) Output + Input

19. : Which type of machine converts electrical energy into mechanical energy?
(A) Transformer
(B) Generator
(C) Motor
(D) Rectifier

20. : The unit of electrical energy is:
(A) Joule
(B) Watt
(C) Volt
(D) Ampere