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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 120°.
 60°.
 90°.
 30°.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce eddy current loss.
  to provide better flux linkage.
  to reduce hysteresis loss.
  to reduce mechanical losses.

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Electrical Machines
Armature reaction in dc motor results

  short circuit.
  decrease in speed.
  increase in speed.
  open circuit.

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Electrical Machines
DC series motor is best suited for electric traction as

 It consume less power.
 It runs at very high speed at light load.
 It is cheaper in cost.
  It develops high starting torque.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 load angle
 excitation
 both 1and 2

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Electrical Machines
Tap changer is generally provided in

  power transformer.
 current transformer.
 earthing transformer.
 voltage transformer.

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MORE MCQ ON Electrical Machines

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