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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 copper
 brass
 hard-drawn copper

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  designing the motor for adequate synchronizing power.
  providing damper winding in the rotor pole faces.
  any of above methods.
  using a flywheel.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of hydro generator.
  none of these.
 equal to that of the effective length of the line.
 greater than that of turbo alternator.

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Electrical Machines
Synchronising power of a synchronous motor varies

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

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

 cumulatively compounded generator
 series generator
 differentially compounded generator
 shunt generator

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Both Compensating and Commutating pole winding.
 Commutating pole winding.
 Compensating winding.
 Auxiliary winding.

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