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Electrical Machines

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

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

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  Can't be determined.
 20 N.
  15 N.
  None of these.

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Electrical Machines
DC machine is a

 conduction machine.
 both are correct.
 convection machine.
 none of above are correct.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce armature heating.
 Increase speed
 Reduce starting torque.
 Increase acceleration duration.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 38%
 68%
 40%
 60%

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 7%.
  8.9%.
 14%.
 0%.

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