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Electrical Machines

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

 44 A.
 440 A.
 400 A.
 40 A.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
 reduced starting torque.
 low noise.
  a large starting torque.

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Electrical Machines
Field weakening method is also called as-----------?

 constant power control
 constant current control
 constant torque control
 constant voltage control

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Electrical Machines
The functions of inter poles are

 both 1 and 2
None of these
 reduce cross magnetization effect and improve commutation
 nullify reactance voltage and improve the commutation.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 dependent upon the load.
 180o.
 90o.

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Electrical Machines
The shaft of induction motor should be

  hollow.
  any of these.
  flexible.
  stiff.

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MORE MCQ ON Electrical Machines

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