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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 -1.92
 0.08
 1.92

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  equalizing coils.
  external star-connected resistors.
  3 - Φ AC supply.
  DC supply.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 increase starting torque.
  reduce magnetizing current.
 reduce chance of cogging.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  crossmagnetising.
  magnetising.
  none of above.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 series motor
 differentially compounded motor
 comulatively compounded motor
 permanent magnet 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.
 increase.
 decrease.

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