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Electrical Machines

Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 60
 600
 660

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

 Conservator tank.
 Radiator.
 Tap changer.
  Commutator.

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Electrical Machines
The crawling in the induction motor is caused by

 improper design of stator laminations
 harmonics developed in the motor
 high loads
 low voltage supply

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

 cooling the armature.
  increasing the input to the prime mover.
  increasing the excitation.
  reducing the load voltage.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
None of these
 rotor resistance
 supply frequency

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Electrical Machines
In DC generators brushes are used for

 collecting of current without any sparkings
 reduce eddy current loss
 collecting of voltage
 convert ac armature current in to dc

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