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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

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

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Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
 Series motor with interpoles.
  Series motor without interpoles.
 Cummulative compound motor with interpoles.

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Electrical Machines
The frame of an induction motor is made of

  aluminium.
  stainless steel.
  closed grained cast iron.
  silicon steel.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Delta - star
 Star - delta
 Star - star

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 slip rings.
 solid connection.
 commutator.
 none of above.

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 Armature flux distorts the main field flux.
 None of the options.
 Armature flux weakens the main field flux.

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