1. A universal motor is a type of motor that can operate on:
A. Both AC and DC
B. AC only
C. DC only
D. None of the above
Answer. (A)
2. The speed of a universal motor is proportional to:
A. The voltage applied
B. The current applied
C. The square of the voltage applied
D. The square of the current applied
Answer. (B)
3. The direction of rotation of a universal motor can be reversed by:
A. Reversing the polarity of the voltage applied
B. Reversing the direction of the current applied
C. Reversing both the polarity of the voltage applied and the direction of the current applied
D. None of the above
Answer. (A)
4. The speed of a universal motor can be controlled by:
A. Varying the voltage applied
B. Varying the current applied
C. Varying the resistance in the armature circuit
D. All of the above
Answer. (D)
5. The most common type of universal motor is the:
A. Series motor
B. Shunt motor
C. Compound motor
D. Permanent magnet motor
Answer. (A)
6. Universal motors are used in a variety of applications, including:
A. Electric drills
B. Vacuum cleaners
C. Hand mixers
D. Sewing machines
Answer. (A, B, C, D)
7. The main advantage of universal motors is their:
A. High starting torque and small size
B. High efficiency
C. Low cost
D. High speed
Answer. (A)
8. The main disadvantage of universal motors is their:
A. High speed and low power factor
B. High maintenance requirements
C. Low efficiency
D. Low cost
Answer. (A)
9. The armature winding of a universal motor is made of:
A. Copper
B. Aluminum
C. Steel
D. None of the above
Answer. (A)
10. The field winding of a universal motor is made of:
A. Copper
B. Aluminum
C. Steel
D. None of the above
Answer. (A)
11. The brushes in a universal motor are made of:
A. Carbon
B. Copper
C. Silver
D. None of the above
Answer. (A)
12. The commutator in a universal motor is made of:
A. Carbon
B. Copper
C. Silver
D. None of the above
Answer. (B)
13. The speed of a universal motor increases as the load increases.
A. True
B. False
Answer. (B)
14. The torque of a universal motor increases as the load increases.
A. True
B. False
Answer. (True)
15. The efficiency of a universal motor decreases as the load increases.
A. True
B. False
Answer. (True)
16. Universal motors are less efficient than induction motors.
A. True
B. False
Answer. (True)
17. Universal motors are more expensive than induction motors.
A. True
B. False
Answer. (False)
18. Universal motors are more common than induction motors.
A. True
B. False
Answer. (False)
19. Universal motors are used in high-power applications.
A. True
B. False
Answer. (False)
20. Universal motors are used in low-power applications.
A. True
B. False
Answer. (True)
21. Universal motors are used in applications where high starting torque is required.
A. True
B. False
Answer. (True)
22. Universal motors are used in applications where high efficiency is required.
A. True
B. False
Answer. (False)
23. Universal motors are used in applications where low maintenance is required.
A. True
B. False
Answer. (True)
24. Universal motors are used in applications where small size is required.
A. True
B. False
Answer. (True)
25. Universal motors are used in applications where high speed is required.
A. True
B. False
Answer. (True)