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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
None of these
 Xd = Xq.
 Xd < Xq.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 increasing the number of turns.
 using soft material for winding.
 using transformer oil of better quality.

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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 chance of crawling.
  reduce the magnetizing current.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 45°.
  load angle is 0°.
  load angle is equal to internal angle θ.
  input power factor is unity.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
  Output power at the shaft.
 Power drawn in KVA.
 Gross power.

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

 T ∝ 1/V²
 T ∝ V
 T∝ V²
 T ∝ 1/V

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