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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
Commutator in DC generator is used for

 collecting of current
 reduce losses
 increase efficiency
 convert AC armature current in to DC

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thin
 less and thick
 less and thin
 large and thick

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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
What are the starters used for starting of cage motors?

 DOL starter.
 Star-delta starter.
 Auto transformer starter.
  All of these.

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Electrical Machines
Induction motors have the advantage of

  all of below.
  less cost.
  simple in construction.
  less maintenance.

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