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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 8 pole.
  2 pole.
 4 pole.
 6 pole.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  reversed.
  none of these.
  modified.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Reluctance motor.
  Slip ring induction motor.
  Universal motor.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Repulsion.
  Split phase.
  Universal.
  Capacitor run.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  star.
  delta.
  delta or star according to need.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P/2*ωm
 ωe = P*ωm
 ωe = ωm
 ωe = 2/P*ωm

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