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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Ns
 Nr
 S.Ns
 Zero

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

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Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 total iron losses
 eddy current loss
 copper loss

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Electrical Machines
A 3 - Φ slip ring motor has

  any of the above.
  short-circuited rotor.
  wound rotor.
  double cage rotor.

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Electrical Machines
Generators work on the principle of production of

 dynamically induced emf.
 dynamically and statically induced emf.
 statically induced emf.
None of these

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 3 only
 1, 2 and 3
 1, 3
 1, 2, 3 and 4

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