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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 50 ohm.
 100 ohm.
  0.1 ohm.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Slip ring induction motor.
  Stepper motor.
  Synchronous motor.
  DC differential compound motor.

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Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  DC shunt motor.
  Universal motor.
  3 - φ IM.

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
All of these
 Used as boosters in dc distribution or transmission.
 Air crafts.

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Electrical Machines
Which of the following is the largest conversion device?

All of these
 Synchronous machine
 DC machine
 Induction machine

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  air gap flux.
  magnetizing current.
  speed.
  power factor.

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