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Electrical Machines

Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  speed.
  air gap flux.
  power factor.
  magnetizing current.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
  Series motor without interpoles.
 Cummulative compound motor with interpoles.
 Series motor with interpoles.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 six.
 two.
 four.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  results in sparking trouble.
  reduces generator emf.
  reduces inter poles flux density.
  increases armature speed.

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
 Draw more current without producing sufficient torque.
 Not develop starting torque.
  Run at dangerously high speed.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the motor will come to stop.
 the armature current will reduce.
 the motor will attain dangerously high speed.

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