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Electrical Machines

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

  convection.
 conduction.
 radiation.
All of these

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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

 230 V
 200 V
 115 V
 460 V

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Shunt field resistance control.
 Armature resistance control.
 Armature voltage control.
 Any of above.

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 infinite value
 any of the above
 zero
 maximum

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.
  of low resistivity.
  lighter in weight.

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Electrical Machines
In DC machine yoke offers

 mechanical protection to the machine
 produce working flux
 both A and B
 flux path completion

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MORE MCQ ON Electrical Machines

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