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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 5%
 40%
 10%

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Electrical Machines
Which of the following bearings and their uses are correct

 both A and B
 neither 1 nor 2
 roller bearings → large machines
 ball bearings → small machines

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KVA.
  Output power at the shaft.
 Gross power.
 Power drawn in KW.

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Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Lift.
  Traction.
  Food mixer.

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Electrical Machines
Open circuit in a transformer is prefered with

 high frequency supply
 rated transformer voltage
 rated transformer current
 direct current

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Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
  both cooling and insulation.
 lubrication.
  insulating.

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