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Electrical Machines

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

 1/V
 supply voltage V
 V²
 1/V²

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Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 eddy current loss.
 copper loss.
 both 2 and 3.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, unshaded
 shaded, shaded
 unshaded, shaded
 shaded, unshaded

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Electrical Machines
In case of IM the torque is

  inversely proportional to √slip.
  directly proportional to slip2.
  directly proportional to slip.
  inversely proportional to slip.

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Electrical Machines
An IM cannot run at synchronous speed because

  induction motor will become synchronous motor.
  air friction will prevent it.
  none of above.
  rotor torque will not be produced.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 4
 1, 3
 2, 4
 2, 3

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