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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 maximum current.
 maximum voltage.
 no voltage.

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Electrical Machines
The reduced air gap results in an increase

  breaking torque.
  cost of operation.
  power factor.
  starting torque.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia remains constant but ωm increase
 both armature current Ia and speed ωm increase
 both decrese
 Ia increases and ωm decreses

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  balance the rotor dynamically.
  none of these.
  eliminate noise.
  facilitate cooling of rotor.

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Electrical Machines
Series generators are used in which of the following applications?

 Used as boosters in dc distribution or transmission.
All of these
 Air crafts.
 Arc welding.

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 damping winding.
  common winding.
 compensating winding.

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