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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

  Commutator.
 Radiator.
 Conservator tank.
 Tap changer.

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  none.
  larger bore diameter.
  larger output.
  both.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Applied voltage.
 All of these.
 Armature current.
 Field flux.

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

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

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
  DC series motor.
  DC series generator.
 DC shunt motor.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same phase sequence
 same prime mover speed
 same voltage magnitude
 same frequency

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