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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?

 5%
 40%
 10%
 19%

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 None of above.
 decrease.
 increase.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 over load.
 zero or very low voltage supply.
 high filed circuit resistance.

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 no voltage.
 maximum voltage.
 maximum current.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
 increase
 decrease
None of these

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  shunt generator.
  level compound.
  short - shunt generator.
 series generator.

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