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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 armature.
  magnetic field poles.
 core.
 none of these.

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 Synchronous impedance method.
 MMf method.
 ZPF method.

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Electrical Machines
An induction motor is, in general analogous to

None of these
 two winding transformer with secondary short circuited.
 two winding transformer with secondary open circuited.
 auto transformer.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
  4 Ω.
  2 Ω.
 8 Ω.

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Electrical Machines
The use of higher flux density in the transformer design

None of these
 reduces the weigh per KVA
 increases the weigh per KVA
 has no relation with the weight of transformer

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 45 ppm.
 25 ppm.
 20 ppm.

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