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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 short circuit.
 reduction in generated emf.
 open circuit.

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Electrical Machines
Which type motors are preferred for lathes?

 DC shunt motors.
 Squirrel Cage induction motor.
 Synchronous motor.
 Either A or B.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetization as well as demagnetization.
  cross-magnetisation.
  none of above.
 demagnetisation.

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Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  any of these.
  over excitation.
  heating.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2

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