20 Multiple Choice Questions (MCQs) with Answers for Electrical Engineering Students | PART 2

Looking to sharpen your understanding of electrical engineering concepts? Here's another carefully selected set of 20 MCQs with answers to boost your knowledge in electronics, control systems, measurements, and more.

1. In a semiconductor, the majority carriers in N-type material are:

A) Holes
B) Electrons
C) Protons
D) Ions

✅ Answer: B

2. A diode allows current to flow in:

A) Both directions
B) Only reverse direction
C) Only forward direction
D) No direction

✅ Answer: C

3. The efficiency of a transformer is generally:

A) Less than 50%
B) About 60%
C) More than 90%
D) 100%

✅ Answer: C

4. Which instrument is used to measure electric current?

A) Voltmeter
B) Ohmmeter
C) Ammeter
D) Wattmeter

✅ Answer: C

5. In a DC motor, commutator is used to:

A) Increase speed
B) Reduce sparking
C) Reverse current direction
D) Control voltage

✅ Answer: C

6. What is the unit of magnetic flux?

A) Tesla
B) Henry
C) Weber
D) Newton

✅ Answer: C

7. A Zener diode is used for:

A) Rectification
B) Amplification
C) Voltage regulation
D) Oscillation

✅ Answer: C

8. The function of a fuse is to:

A) Regulate voltage
B) Increase current
C) Prevent overcurrent
D) Store charge

✅ Answer: C

9. In a star connection, line voltage is related to phase voltage by:

A) VL = √3 × Vph
B) VL = Vph
C) VL = Vph / √3
D) VL = 3 × Vph

✅ Answer: A

10. The color code for a 1kΩ resistor with 5% tolerance is:

A) Brown, Black, Red, Gold
B) Red, Black, Brown, Gold
C) Brown, Red, Red, Silver
D) Orange, Black, Brown, Gold

✅ Answer: A

11. The SI unit of inductance is:

A) Ohm
B) Farad
C) Henry
D) Weber

✅ Answer: C

12. Which logic gate has an output that is false only when all inputs are true?

A) AND
B) OR
C) NAND
D) NOR

✅ Answer: C

13. Which of the following is a linear circuit element?

A) Transistor
B) Diode
C) Resistor
D) SCR

✅ Answer: C

14. What type of current flows in household wiring (standard mains)?

A) DC
B) Pulsating DC
C) AC
D) None

✅ Answer: C

15. In digital electronics, a bit is:

A) A voltage drop
B) A binary digit
C) A resistor value
D) A current pulse

✅ Answer: B

16. Which component stores electrical energy?

A) Diode
B) Transistor
C) Capacitor
D) Inductor

✅ Answer: C

17. The frequency of a signal is inversely proportional to its:

A) Voltage
B) Current
C) Period
D) Power

✅ Answer: C

18. Which of the following is a controlled switch?

A) Relay
B) Diode
C) Thyristor
D) Capacitor

✅ Answer: C

19. A synchronous motor operates at:

A) Variable speed
B) Below synchronous speed
C) Synchronous speed
D) Above synchronous speed

✅ Answer: C

20. Maximum power transfer occurs when:

A) Load resistance > Source resistance
B) Load resistance = Source resistance
C) Load resistance < Source resistance
D) Load inductance = Source resistance

✅ Answer: B