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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
The armature shaft must be able to withstand

All of these
 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Both rotor and stator winding.
  Rotor mmf wave.
  Rotor winding.
  Stator winding.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
  region under main pole.
 throughout the air gap.
 interpole region.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction by slowly.
 motor will not run.
 it will run in same direction.
 it will run in opposite direction.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 16KVA
 4KVA
 20KVA

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