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
Final Words
These questions are excellent for interviews, competitive exams, and foundational understanding. Make sure to regularly practice MCQs to strengthen your concepts and spot knowledge gaps.
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