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Electrical Machines

Electrical Machines
Stepper motor is used in

 traction
All of these
 food processing
 computer printers

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

None of these
 Good voltage regulation
 High voltage regulation
 Low short circuit current

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

 cumulatively compounded generator
 differentially compounded generator
 series generator
 shunt generator

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing input power of the prime mover.
 increasing armature cooling.
  increasing terminal voltage.
  increasing armature resistance.

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Electrical Machines
In DC generators brushes are used for

 convert ac armature current in to dc
 reduce eddy current loss
 collecting of voltage
 collecting of current without any sparkings

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
 Torque and field current.
  Armature current and field current.
 Armature current and torque.

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