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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  open circuit.
  increase in speed.
  decrease in speed.
  short circuit.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 1/S
 S
 1-S

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 cumulatively compounded generator
 series generator
 shunt generator
 differentially compounded generator

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  harmonics.
  crawling.
  cogging.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid locking of the armature.
All of these
 to avoid over heating.

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

 10%
 19%
 40%
 5%

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