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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 neither the voltage nor the torque
 voltage but not the torque
 torque but not the voltage
 both the torque and voltage

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Electrical Machines
A DC compound motor has

 only series field winding.
 tertiary winding.
 both shunt and series field winding.
 only shunt field winding.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 200 V
 460 V
 230 V

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 2.
 4.
  8.
 1.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Starting torque.
 Operating speed.
  Full load current.
 Starting torque, operating speed, full load current.

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MORE MCQ ON Electrical Machines

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