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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  stator frame.
  pole faces.
  rotor shaft.
None of these

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Electrical Machines
Methods of synchronizing of alternator may be done by

 all dark lamp method.
 all bright lamp method.
  all of these.
 one dark two bright.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - star
 Star - delta
 Delta - delta

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Electrical Machines
An induction motor is, in general analogous to

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

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 38.5 Nm.
 74 Nm.
  65.8 Nm.
 27.73 Nm .

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in normal operation.
  Either short circuit or open circuit occurs.
  Fail to start.
  It will rotates in reverse direction.

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