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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

None of these
 decrease
 not changed
 increase

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Electrical Machines
During no load test, an induction motor draws power

  for copper loss and windage friction loss.
  for core loss and windage and friction loss.
  only for the small copper loss.
  for core loss and copper loss.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

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

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Electrical Machines
Transformer action requires a

 alternating magnetic lux.
 constant magnetic flux.
 increasing magnetic flux.
 alternating electric flux.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 reversing the terminals of starting winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
All of these

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta.
  delta or star according to need.
  star.
None of these

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MORE MCQ ON Electrical Machines

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