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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
All of these
 conduction.
  convection.

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Electrical Machines
Which of the following generators are used in arc welding?

 differential compound generators
 shunt generators
 series generators
 cumulative compound generators

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Electrical Machines
A compound motor has

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

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 0.
 1000.
 2000.

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  maintaining constant excitation.
  running the motor on leading power factors.
  oscillation cannot be damped.
  providing damper bars in the rotor pole faces.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable frequency.
  variable load.
  windage friction.
  variable supply voltage.

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MORE MCQ ON Electrical Machines

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