Single phase Induction Motor Questions and Answers - Set 03 - ObjectiveBooks

Single phase Induction Motor Questions and Answers - Set 03

Practice Test: Question Set - 03


1. As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for
    (A) Fans
    (B) Blowers
    (C) Sound equipment
    (D) Mixer grinders

2. The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
    (A) Improves the efficiency
    (B) Helps the rotor teeth to remain under the stator teeth
    (C) Helps in reducing the tendency of the rotor teeth to remain under the stator teeth
    (D) Improves the power factor

3. Most of the fractional horsepower motors have either
    (A) Hard and annealed bearings
    (B) Ball or roller bearings
    (C) Soft and porous bearings
    (D) Plain or sleeve bearings

4. The capacitors used in single-phase capacitor motors have no
    (A) Voltage rating
    (B) Dielectric medium
    (C) Polarity marking
    (D) Definite value

5. Which of the following statements regarding single-phase induction motors correct?
    (A) It requires only one winding
    (B) It can rotate in one direction only
    (C) It is self-starting
    (D) It is not self-starting

6. If the capacitor of a single-phase motor is short-circuited
    (A) The motor will not start
    (B) The motor will run
    (C) The motor will run in reverse direction
    (D) The motor will run in the same direction at reduced r.p.m.

7. A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will
    (A) Start and then stop
    (B) Start and run slowly
    (C) Start and run at rated speed
    (D) Not start at all

8. For which of the applications a reluctance motor is preferred?
    (A) Electric shavers
    (B) Refrigerators
    (C) Signaling and timing devices
    (D) Lifts and hoists

9. Which of the following motors has highest starting torque?
    (A) Repulsion motor
    (B) Shaped pole motor
    (C) Capacitor-start motor
    (D) Split-phase motor

10. The rotor of a hysteresis motor is made of
    (A) Aluminium
    (B) Cast iron
    (C) Chrome steel
    (D) Copper

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