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Electrical Machines

Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 3.76%.
 4.76%.
 2.56 %.
 2.57 %.

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Electrical Machines
In a synchronous motor, damper windings are provided on

  pole faces.
  rotor shaft.
  stator frame.
None of these

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

  demagnetizing.
 magnetizing.
 cross – magnetizing.
 ineffective.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 1000 rpm
 500 rpm
 250 rpm
 2000 rpm

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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 provide better flux linkage.
  to reduce hysteresis loss.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 173 A.
 240 A.
 127 A.
  190 A.

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MORE MCQ ON Electrical Machines

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