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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 sinδ
 sin2δ
 cos2δ

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Electrical Machines
In a transformer which of the following losses are zero?

 Copper loss
 Rotational loss
 Iron loss
All of these

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  shunt generator.
 series generator.
  level compound.
  short - shunt generator.

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Electrical Machines
In synchronous motor the torque is proportional to

 P²
 Power P
 1/P
 1/P²

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

 either increase or decrease
None of these
 increase
 decrease

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 4, 5, 6
 1, 2, 5
 3, 4, 5
 2, 3, 6

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