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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 either GNA or MNA
None of these
 MNA

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of cogging.
  reduce the chance of crawling.
  reduce the magnetizing current.
  increase the starting torque.

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Electrical Machines
Open circuit test on transformer gives

 hysteresis loss
 eddy current loss
 copper loss
 both 1and 2

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 greater than the primary.
 less than primary.
 equal to primary.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Field excitaion.
  Supply voltage.
  Armature voltage.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 shunt generator
 over compound generator
 both B and C
 series generators

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