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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
 flux(φ)
None of these
 both A and B

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 It will run in same direction.
 motor will become slow.
  It will run in opposite direction.
 motor will not run.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  very low
  greater than one.
  approx to one.
  less than one.

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Electrical Machines
An induction motor is, in general analogous to

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

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Both lap and wave winding
 None of above
 Lap winding
 Wave winding

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