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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T ∝ V
 T∝ V²
 T ∝ 1/V²

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Electrical Machines
Which type of motors are preferred in lifts?

None of these
 DC series motors.
 DC compound motors.
 DC shunt motors.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  cage.
  none of these.
  wound.

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

  cogging.
  skewing.
  slip.
  crawling.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Armature.
  Commutator.
 Yoke.
 Brush.

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

 series generator
 shunt generator
 differentially compounded generator
 cumulatively compounded generator

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