Single Phase Induction Motor Viva Questions - Set 05 - ObjectiveBooks

Single Phase Induction Motor Viva Questions - Set 05

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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