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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 more.
 same.
 between 50% and 90%.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 175 V
 140 V
 120 V
 240 V

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 30°
 72°
 36°

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  provide return path for the flux.
  ventilate the armature.
  hold armature stamping in position.

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

None of these
  Cast iron bearings.
  Bush bearings.
  Ball bearings.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 increase starting torque.
 reduce chance of cogging.
  reduce magnetizing current.
 reduce chance of crawling.

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