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Electrical Machines

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

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

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

  Shunt.
 Cummulative compound.
 Differential compound.
 Series.

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Electrical Machines
Ward Leonard control provides speed control

 above rated speed.
 in one direction only.
 below rated speed.
 in both direction.

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Electrical Machines
Dynamic braking is employed to brake

 reversing drive
None of these
 both 1 and 2
 non reversing drive

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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

 2.57 %.
 3.76%.
 4.76%.
 2.56 %.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

  region under main pole.
 throughout the air gap.
None of these
 interpole region.

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