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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  DOL.
  star delta.
None of these
  both A and B.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 decrease starting torque
 increase pull out torque
 reduce magnetising current and improve power factor
 improve starting torque

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  induction generator torque.
  synchronous motor torque.
  DC motor torque.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 back emf is equal to applied voltage.
 Back emf is equal.
 None of above.
  Back emf is equal to half of applied voltage.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 supply voltage V
 1/V
 V²

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

  4.
 16.
 8.
 32.

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MORE MCQ ON Electrical Machines

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