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Electrical Machines

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

All of these
 minimum
 maximum
 zero

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 cylindrical.
  salient.
 non uniform cylindrical.
 none of these.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  decreasing of frequency.
  increasing number of poles.
  speed can not be increased.
  increasing of frequency.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

None of these
 Synchronous speed
 Slip speed
 Zero

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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.
 using transformer oil of better quality.
 increasing the number of turns.
 using soft material for winding.

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Electrical Machines
The emf induced in the dc generator armature winding is

 DC
 AC
None of these
 AC and DC

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