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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cos2δ
 cosδ
 sin2δ

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Electrical Machines
Series booster is a

 permanent magnet DC generator.
  series wound DC generator.
 separately excited DC generator.
 shunt wound DC generator.

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

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

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P²
 T∝ P³
 T is independent of P
 T∝ P

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant torque control
 constant voltage control
 constant power control
 constant current control

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 shunt generator
 both B and C
 over compound generator

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