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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
 high viscosity.
 low resistivity.
  low viscosity.

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Electrical Machines
The emf induced in the dc generator armature winding is

 AC
 AC and DC
 DC
None of these

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increase proportional.
 reduce slightly.
 increased slightly.
 remains constant.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of oil in transformer.
  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.
 condition of cork gaskets used in transformer.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid over heating.
All of these
 to avoid locking of the armature.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  delta or star according to need.
  delta.
  star.

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MORE MCQ ON Electrical Machines

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