Practice Test: Question Set - 05
1. Which of the following applications always have some load whenever switched on?
- (A) Vacuum cleaners
- (B) Fan motors
- (C) Pistol drills
- (D) All of the above
2. The motor used for the compressors is
- (A) D.C. series motor
- (B) Shaded pole motor
- (C) Capacitor-start capacitor-run motor
- (D) Reluctance motor
3. Which of the following statements regarding reluctance-start motor is incorrect?
- (A) It is similar to reluctance motor
- (B) It is basically an induction motor and not a
synchronous one
- (C) So far as its basic working principle is
concerned, it is similar to shaded pole motor
- (D) The air-gap between rotor and salient poles
is nonuniform
4. If a D.C. series motor is operated on A.C. supply, it will
- (A) Spark excessively
- (B) Have poor efficiency
- (C) Have poor power factor
- (D) All of the above
5. Hysteresis motor is particularly useful for high-quality record players and tape-recorders because
- (A) It revolves synchronously
- (B) It is not subject to any magnetic or
mechanical vibrations
- (C) It can be easily manufactured in extremely
small sizes of up to 1 W output
- (D) It develops hysteresis torque which is
extremely steady both in amplitude and phase
6. Burning out of windings is due to
- (A) Short circuited capacitor
- (B) Capacitor value hiving changed
- (C) Open circuiting of capacitor
- (D) None of the above
7. If a particular application needs high speed and high starting torque, then which of the following motor will be preferred?
- (A) Universal motor
- (B) Shaded pole type motor
- (C) Capacitor start motor
- (D) Capacitor start and run motor
8. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
- (A) Improve power factor
- (B) Increase overload capacity
- (C) Reduce fluctuations in torque
- (D) To improve torque
9. In split-phase motor auxiliary winding is of
- (A) Thick wire placed at the bottom of the slots
- (B) Thick wire placed at the top of the slots
- (C) Thin wire placed at the top of the slots
- (D) Thin wire placed at the bottom of the slots
10. Which type of load is offered by cranes and hoists?
- (A) Gradually varying load
- (B) Non-reversing, no-load start
- (C) Reversing, light start
- (D) Reversing, heavy start
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