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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
  40 A.
 44 A.
 400 A.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
 320 Amp.
  0.5 Amp.
 800 Amp.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 compensating winding
All of these
 pole chamfering
 pole stacking

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 increase.
 decrease.
None of these
 remains constant.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
 10 %.
  15 %.
  20 %.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will remain the same
None of these
 will become lagging

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