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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  zero.
  220 V.
  about 50 V.
  about 2 V.

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

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

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

  Kef2Kf2Bm2.
 Kef2KfBm2.
 KefKf2Bm2.
 Kef2Kf2Bm.

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Electrical Machines
Which of the DC Motor use flywheel?

 Shunt motor.
 Series motor.
 Differently compared motor.
 Cumulatively compound motor.

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 slip ring induction motor.
 dc shunt motor.
 synchronous motor.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 damping winding.
 compensating winding.
 tertiary winding.

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