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Electrical Machines

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

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

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
 armature reaction.
None of these
  permanent magnets.

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Electrical Machines
which of the following type of brush and their application is/are correct

 electro graphite → large ratings
All of these
 copper graphite → low voltage high current density
 carbon brush → normal ratings

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Electrical Machines
Resistance commutation is used generally in case of

  fractional kW DC machines.
 DC machines above 10 kW.
 DC machines bellow 5 kW.
None of these

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 unity
 0.2 lag
 0.9 lag

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 cogging.
 plugging.
 crawling.
 locking.

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