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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 cast iron.
 fibre.
 silicon steel.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Both 1 and 2
 Eddy current losses
 Copper losses

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Delta side leads by 30°.
  Delta side lags by -30°.
 Star side leads by 30°.
 Star side lags by -30°.

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Electrical Machines
The reduced air gap results in an increase

  breaking torque.
  starting torque.
  cost of operation.
  power factor.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 to an AC source.
 in reverse.
  to a DC source.
 to earth.

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Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
 lap winding
None of these
 wave winding

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