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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 36
 74
 72

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  none of these.
  eliminate noise.
  balance the rotor dynamically.
  facilitate cooling of rotor.

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Electrical Machines
In DC generator, the electricity produced in armature is

  DC.
  armature is not present in DC generator.
  AC.
None of these

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

 differentially compounded generator
 series generator
 cumulatively compounded generator
 shunt generator

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  remains constant.
  increases upto a limit and then remains almost constant.
  decreases.
 increases.

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Electrical Machines
Dynamic braking can be used for

 shunt motors.
All of these
 compound motors.
 series motors.

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