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Electrical Machines

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

 conduction.
All of these
 radiation.
  convection.

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Electrical Machines
Transformer action requires a

 constant magnetic flux.
 increasing magnetic flux.
 alternating electric flux.
 alternating magnetic lux.

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Electrical Machines
Dynamic braking is very effective for

 shunt motors.
 differential compound motors.
 series motors.
 separately excited motors.

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Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  carbon.
  stainless steel.
  aluminium.

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as Xs2
 inversely as 1/Xs
 directly as synchronous reactances Xs
All of these

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 series generator
 differentially compounded generator
 cumulatively compounded generator
 shunt generator

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