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Electrical Machines

Electrical Machines
The speed regulation of a DC motor is given as

 NnL/NfL.
 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL − NfL.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  greater than one.
  approx to one.
  less than one.
  very low

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 proportional to square of rotor speed.
  proportional to rotor speed.
 constant independent of speed.
 zero.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  none of above.
  only field terminals are changed.
  only armature terminals are reversed.
  either field terminals are reversed or armature terminals are reversed.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 unity
 0.2 lag
 0.2 lead

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Electrical Machines
At slip s = 1 torque developed in machine is

  none.
  starting torque.
  electromagnetic torque.
  maximum torque.

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MORE MCQ ON Electrical Machines

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