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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T ∝ V
 T∝ V²
 T ∝ 1/V²

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sp²
 PZL/4S
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Eddy current loss.
 Hysteresis loss.
 Stray loss.
 Copper loss.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  constant.
  variable.
  maximum.
  minimum.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  none.
  always opened.
  always closed.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 both A and B
 below rated speed
None of these

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