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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 demagnetization
 magnetization
 cross magnetization

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase synchronous machine.
  None of these.
  Poly-phase induction motor.
  Single phase induction motor.

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Electrical Machines
Synchronous reactance of an alternator represents

All of these
 a reactance operating at synchronous speed
 field winding reactance
 armature reactance and leakage reactance

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  less costly motor is not required.
  low starting torque.
 power factor is less.
  high starting torque.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 both eddy current and hysteresis loss.
 ohmic loss.
  hysteresis loss.
 eddy current loss.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On armature.
None of these
 On yoke in the inter pole gap.
  On yoke in the pole faces.

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