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Electrical Machines

Electrical Machines
Compensating winding is placed in the

 main field
 armature core
 pole shoe
All of these

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

  Kef2Kf2Bm2.
 Kef2KfBm2.
 KefKf2Bm2.
 Kef2Kf2Bm.

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

  18.
 50.
 80.
 36.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
 0.7.
 0.3.
  0.54.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
 condition of cork gaskets used in transformer.

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

 maximum
 zero
 minimum
All of these

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