25+ MCQs about single-phase induction motors:

1. Which of the following is not a type of single-phase induction motor?
A. Shaded pole motor
B. Capacitor start motor
C. Capacitor run motor
D. Split-phase motor
Answer: (C)

2. Which of the following types of single-phase induction motors has the highest starting torque?
A. Shaded pole motor
B. Capacitor start motor
C. Capacitor run motor
D. Split-phase motor
Answer: (B)

3. The starting capacitor in a capacitor start motor is connected in:
A. series with the main winding
B. parallel with the main winding
C. series with the rotor winding
D. parallel with the rotor winding
Answer: (A)

4. The run capacitor in a capacitor run motor is connected in:
A. series with the main winding
B. parallel with the main winding
C. series with the rotor winding
D. parallel with the rotor winding
Answer: (B)

5. The power factor of a single-phase induction motor is typically:
A. unity
B. lagging
C. leading
D. zero
Answer: (B)

6. The speed of a single-phase induction motor is:
A. directly proportional to the supply voltage
B. inversely proportional to the supply voltage
C. directly proportional to the frequency
D. inversely proportional to the frequency
Answer: (C)

7. The rotor of a single-phase induction motor is:
A. squirrel cage type
B. wound type
C. Both squirrel cage and wound type
D. none of the above
Answer: (A)

8. The starting current of a single-phase induction motor is:
A. lower than the running current
B. equal to the running current
C. higher than the running current
D. zero
Answer: (C)

9. The synchronous speed of a single-phase induction motor is:
A. equal to the supply frequency
B. twice the supply frequency
C. half the supply frequency
D. none of the above
Answer: (A)

10. The slip of a single-phase induction motor is:
A. zero
B. less than 1
C. greater than 1
D. equal to the supply frequency
Answer: (B)

11. The torque produced by a single-phase induction motor is:
A. directly proportional to the slip
B. inversely proportional to the slip
C. directly proportional to the square of the slip
D. inversely proportional to the square of the slip
Answer: (A)

12. The starting torque of a single-phase induction motor can be increased by:
A. increasing the supply voltage
B. decreasing the supply voltage
C. Using a larger capacitor
D. using a smaller capacitor
Answer: (C)

13. The power factor of a single-phase induction motor can be improved by:
A. increasing the supply voltage
B. decreasing the supply voltage
C. using a larger capacitor
D. using a smaller capacitor
Answer: (D)

14. The efficiency of a single-phase induction motor is typically:
A. high
B. medium
C. low
D. very low
Answer: (C)

15. Single-phase induction motors are used in a wide variety of applications, including:
A. fans
B. pumps
C. compressors
D. all of the above
Answer: (D)

16. The starting torque of a shaded pole motor is produced by:
A. The shading coil
B. The main winding
C. Both the shading coil and the main winding
D. none of the above
Answer: (A)

17. The shaded pole motor is the simplest type of single-phase induction motor.
A. True
B. False
Answer: (A)

18. The reluctance motor is a type of single-phase induction motor that uses the principle of reluctance torque to produce starting torque.
A. True
B. False
Answer: (A)

19. The reluctance motor has a higher starting torque than a shaded pole motor.
A. True
B. False
Answer: (False)

20. The reluctance motor has a higher efficiency than a shaded pole motor.
A. True
B. False
Answer: (True)

21. The reluctance motor has a lower power factor than a shaded pole motor.
A. True
B. False
Answer: (True)

22. The reluctance motor is more expensive than a shaded pole motor.
A. True
B. False
Answer: (False)

23. The reluctance motor is used in a wider variety of applications than a shaded pole motor.
A. True
B. False
Answer: (False)

24. The reluctance motor is a better choice for applications that require high starting torque and low power factor.
A. True
B. False
Answer: (True)

25. The reluctance motor is a better choice for applications that require low starting torque and high power factor.
A. True
B. False
Answer: (False)