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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 25° to 30°
 0°
 90°

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  single phase induction motor.
  high speed motor.
  low horse power motor.
  high torque motor.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Compound Wound DC Motor
 DC Series Motor
 DC Shunt Motor
 Separately Excited DC Motor

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 None of above.
 decrease.
 increase.

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Electrical Machines
The condition for maximum running torque is

 unity
 0.707 lagging
 zero
 0.5 lagging
 R = S.X

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Electrical Machines
High starting torque and low starting current is the advantage of

  slip ring induction motor.
  hysteresis motor.
  squirrel cage induction motor.
  stepper motor.

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MORE MCQ ON Electrical Machines

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