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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
 total value.
 average value.
  maximum value.

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Electrical Machines
Dummy coils are used for

 reducing armature reaction.
 increasing efficiency.
 mechanical balancing.
All of these

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

 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
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Field control.
 Armature control.
 Multiple voltage control.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.
 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
  permanent magnets.
None of these
 armature reaction.

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