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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

None of these
  rotor shaft.
  stator frame.
  pole faces.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 238.2 V.
 271.7 V.
 240 V.
  256.4 V.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 175 V
 120 V
 240 V
 140 V

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.
  1 mg of KOH / gm.
 2 mg of KOH / gm.

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Electrical Machines
An IM cannot run at synchronous speed because

  induction motor will become synchronous motor.
  none of above.
  rotor torque will not be produced.
  air friction will prevent it.

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Electrical Machines
The condition for maximum running torque is

 R = S.X
 unity
 0.707 lagging
 0.5 lagging
 zero

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MORE MCQ ON Electrical Machines

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