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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

  All of this.
 Blowers and fans.
 Centrifugal pumps
 Lathes.

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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 voltage magnitude
 same frequency
 same prime mover speed

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetization as well as demagnetization.
  cross-magnetisation.
  none of above.
 demagnetisation.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
 32°C.
 27°C.
  45°C.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 2000.
 0.
 500.
 1000.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Saddle shape.
 Peaky in nature.
 Triangular and directed towards main pole.
 Triangular and directed towards brush axis.

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