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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
All of these
 conduction.
  convection.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -1.92
 1.92
 -0.08
 0.08

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Electrical Machines
During no load test, an induction motor draws power

  for copper loss and windage friction loss.
  for core loss and windage and friction loss.
  for core loss and copper loss.
  only for the small copper loss.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.125 p.u
  0.75 p.u
  0.25 p.u

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.4.
  1.2.
 1.8.
 1.5.

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Electrical Machines
The shaft of induction motor should be

  any of these.
  stiff.
  hollow.
  flexible.

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