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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
 0.9103 KW.
 5.46 KW.
  2.73 KW.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 In case of any sparking they will be less damaged than copper brushes
 They are self lubricating in nature
 They are not hard as copper brush
All of these

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 DC series generator.
 None of these.
 Compounded DC generator.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  Synchronous motor.
  AC slip ring motor.
  Single phase induction motor.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature voltage control.
 Any of above.
 Shunt field resistance control.
 Armature resistance control.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  high starting torque.
  low starting torque.
  less costly motor is not required.
 power factor is less.

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