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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1/(1-S)
 S
 1-S

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor start.
  Capacitor run.
  Shaded pole.
  Split phase.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral pole.
  Magnetic neutral pole.
  Magnetic neutral plane.
  Magnetic field neutral plane.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 remain the same
 increase
 become zero
 decrease

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  218.5 volt.
  None of these.
  120 volt.
 220.4 volt.

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
None of these
 two winding transformer with secondary short circuited.
 auto transformer.

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