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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

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

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Electrical Machines
In DC generator, armature reaction refers to what?

  Effect of armature flux on the main field flux.
 Effect of armature flux on the load.
None of these
 Effect of field flux on the armature flux.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field diverter control.
 Field control.
 Armature voltage control.
 Armature resistance control.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

  to a DC source.
 to an AC source.
 to earth.
 in reverse.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
 low noise.
  a large starting torque.
 reduced starting torque.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  cogging.
  skewing.
  crawling.

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