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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 50 Hz
 60 Hz
 40 HZ
 25 Hz

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Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
  low viscosity.
 low resistivity.
 high viscosity.

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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
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 20%
 increased by 10%
 reduced by 20%
 reduced by 10%

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
  Both option B and C.
 None of the options.
 Armature flux weakens the main field flux.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 both A and B
 low at light loads only
 low at rated load only

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