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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?

 10%
 5%
 40%
 19%

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Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 armature current(Ia)
 both A and B
 flux(φ)

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 aprroach infinity.
 remain unchanged.
 approach zero.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 heavily loaded and over excited
 heavily loaded and underexcited
 lightly loaded and over excited

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 power factor and dc excitation at constant load
 supply voltage and field current at constant excitation
 power factor and supply voltage during hunting

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 50 V.
 399 V.
 100 V.

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MORE MCQ ON Electrical Machines

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