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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 less than 50%.
 between 50% and 90%.
 same.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 winding of transformer.
 transformer insulating oil.
 iron made tank of transformer.
 steel core in transformer.

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  phosphor bronze.
  stainless steel.
  aluminium.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at over load.
  copper loss at any load.
 copper loss at half load.

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

 not changed
None of these
 decrease
 increase

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
All of these
 maximum
 zero

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