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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  low.
  zero.
  high.
  medium.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

 increases.
  decreases.
  increases upto a limit and then remains almost constant.
  remains constant.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 decreases.
 increases.
 remains constant.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 rough commutator surface.
 severe sparking.
 any of above.

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Electrical Machines
Tap changer is generally provided in

 voltage transformer.
  power transformer.
 current transformer.
 earthing transformer.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC series motor.
 DC compound motor.
 DC Shunt motor.
 Separately excited DC motor.

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