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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
 leading.
 zero.
  lagging.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 dielectric losses.
 copper losses.
 stray losses.
 core losses.

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL − NfL.
 NnL/NfL.
 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  Ia2.
  √Ia.
  1/Ia.

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Electrical Machines
Flux density under leading pole tips in case of generator will

None of these
 decrease
 either increase or decrease
 increase

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
 On armature.
  On yoke in the pole faces.
 On yoke in the inter pole gap.

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