Practice Test: Question Set - 07
1. To reverse the direction of rotation of a capacitor start motor while it is running we should
- (A) Disconnect motor from the supply till it
stops then reconnect it to supply with reversed connection of main or auxiliary
winding
- (B) Disconnect motor from supply and immediately
reconnect it to supply with reversed connections of the main winding
- (C) Reverse the direction of connection of the
auxiliary winding and after motor comes to rest then connect auxiliary winding to
the supply
- (D) Reverse the direction of connections of the
auxiliary winding and immediately connect it to supply
2. Locked rotor current of a shaded pole motor is
- (A) Equal to full load current
- (B) Less than full load current
- (C) Slightly more than full load current
- (D) Several times the full load current
3. In a capacitor start motor, the phase displacement between starting and running winding can be nearly
- (A) 10°
- (B) 30°
- (C) 60°
- (D) 90°
4. Which of the following motors is used in mixes?
- (A) Repulsion motor
- (B) Reluctance motor
- (C) Hysteresis motor
- (D) Universal motor
5. A single-phase induction motor is
- (A) Inherently self-starting with high torque
- (B) Inherently self-starting with low torque
- (C) Inherently non-self-starting with low torque
- (D) Inherently non-self-starting with high
torque
6. The wattage of motor for driving domestic sewing machine will be around
- (A) 100 to 150 W
- (B) 40 to 75 W
- (C) 10 to 30 W
- (D) 5 to 10 W
7. A reluctance motor
- (A) Is self-starting
- (B) Is constant speed motor
- (C) Needs no D.C. excitation
- (D) All of the above
8. The shaded pole motor is used for
- (A) High starting torque
- (B) Low starting torque
- (C) Medium starting torque
- (D) Very high starting torque
9. If a single phase induction motor runs slower than normal, the most likely defect is
- (A) Worn bearings
- (B) Short-circuit in the winding
- (C) Open-circuit in the winding
- (D) None of the above
10. A.C. series motor as compared to D.C. series motor has
- (A) Smaller brush width
- (B) Less number of field turns
- (C) More number of armature turns
- (D) All of the above
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