Single Phase Induction Motor Interview Questions - Set 04 - ObjectiveBooks

Single Phase Induction Motor Interview Questions - Set 04

Practice Test: Question Set - 04


1. In a ceiling-fan employing capacitor run motor
    (A) Secondary winding surrounds the primary winding
    (B) Primary winding surrounds the secondary winding
    (C) Both are usual arrangements
    (D) None of the above

2. Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
    (A) It is comparatively cheaper
    (B) It has almost non-destructible capacitor
    (C) It has low starting as well as running currents at relatively high power factor
    (D) It is quiet in operation

3. A repulsion motor is equipped with
    (A) Slip rings
    (B) Commutator
    (C) Both (A) and (B)
    (D) None of the above

4. The speed of a universal motor is usually reduced by using
    (A) Gearing
    (B) Belts
    (C) Brakes
    (D) Chains

5. In capacitor start single-phase motors
    (A) Current in the starting winding leads the voltage
    (B) Current in the starting winding lags the voltage
    (C) Current in the starting winding is in phase with voltage in running winding
    (D) None of the above

6. A centrifugal switch is used to disconnect starting winding when motor has
    (A) Run for about 1 minute
    (B) Run for about 5 minutes
    (C) Picked up about 50 to 70 percent of rated speed
    (D) Picked up about 10 to 25 percent of rated speed

7. Direction of rotation of a split phase motor can be reversed by reversing the connection of
    (A) Running winding only
    (B) Starting winding only
    (C) Either (A) or (B)
    (D) Both (A) and (B)

8. A Schrage motor can run on
    (A) Zero slip
    (B) Negative slip
    (C) Positive slip
    (D) All of the above

9. In case of a shaded pole motor the direction of rotation of the motor is
    (A) From main pole to shaded pole
    (B) From shaded pole to main pole
    (C) Either of the above depending on voltage
    (D) Either of the above depending on power factor

10. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of
    (A) High inductance of field and armature circuits
    (B) Induced current in rotor due to variations of flux
    (C) Fine copper wire winding
    (D) None of the above

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