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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
  insulating.
  both cooling and insulation.
 lubrication.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Parallel.
 None of the options.
  Series.
 Compound.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 remain the same.
 increase
 be unpredictable.
 decrease.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1-S
 S
 1/S
 1/(1-S)

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Electrical Machines
From no load to full load the slip will

None of these
 slightly increase.
 slightly decrease.
 not change.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant hp drive below the base speed.
 constant torque drive below the base speed.
 constant power drive above base speed.
 constant torque drive above the base speed.

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