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Electrical Machines

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

 120°.
 90°.
 30°.
 60°.

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

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

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 directly.
 inversely.
 has no relation.

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Electrical Machines
The torque developed in IM is nearly proportional to

 1 / V2.
  1 / V.
  V.
  V2.

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 constant magnetic flux.
 alternating electric flux.
 alternating magnetic lux.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

 cooling the armature.
  reducing the load voltage.
  increasing the input to the prime mover.
  increasing the excitation.

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