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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 decreases.
None of these
 increases.
 remains same.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  three phase winding.
  heavy copper or aluminium bars placed in rotor slots.
  single phase winding.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
 both A and B.
None of these
 static induced emf.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
  about 75°.
 0°.
 about 115°.

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Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
  low viscosity.
 low BDV.
 high viscosity.

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 all of these.
 applied voltage.
 resistance of armature culture.

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MORE MCQ ON Electrical Machines

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