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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