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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 180.
 45.
 30.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  None of above.
  Ward Leonard control.
  Rheostatic control.
  Any of above method.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  speed can not be increased.
  increasing of frequency.
  decreasing of frequency.
  increasing number of poles.

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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.

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

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Electrical Machines
Which of the following is not a part of transformer?

 Radiator.
 Tap changer.
  Commutator.
 Conservator tank.

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

 wave winding
 both 1 and 2
 lap winding
None of these

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