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Electrical Machines

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

  2 pole.
 8 pole.
 4 pole.
 6 pole.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 1 : 1.
 none.
 N12 : N22.
 N1 : N2.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  AC slip ring IM.
  Reluctance motor.
  Capacitor type induction motors.
  DC series motor.

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Electrical Machines
The slip of an induction motor normally does not depend on

  synchronous speed.
  core loss component.
  shaft torque.
  rotor speed.

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Ampere's law.
  Fleming's left hand rule.
 Lenz's law.
 Fleming's right hand rule.

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 Armature flux distorts the main field flux.
 Armature flux weakens the main field flux.
 None of the options.

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