- (A) 30 to 40
- (B) 70 to 80
- (C) 80 to 90
- (D) 100
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- (A) Induction motor
- (B) Three-phase series motor
- (C) Schrage motor
- (D) Hysteresis motor
- (A) Hysteresis motor
- (B) Schrage motor
- (C) Universal motor
- (D) Reluctance motor
- (A) brush axis is 45° electrical to field axis
- (B) brush axis coincides with the field axis
- (C) brush axis is 90° electrical to field axis
- (D) both
- (A) d.c. series motor
- (B) shaded pole motor
- (C) capacitor-start capacitor-run motor
- (D) reluctance motor
- (A) provide mechanical balance
- (B) improve power factor and provide better speed regulation
- (C) prevent hunting in the motor
- (D) eliminate armature reaction
- (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
- (A) secondary winding surrounds the primary winding
- (B) primary winding surrounds the secondary winding
- (C) both are usual arrangements
- (D) none of the above
- (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
- (A) become unstable
- (B) draw excessive armature current and may burn out
- (C) fall out of synchronism and come to stand still
- (D) run as induction motor
