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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 1
 4 ang 1
 2 and 2

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1470 rpm
 30 rpm
 1500 rpm
 zero

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  transformer with short-circuited secondary.
  repulsion motor type starting.
  capacitor run IM.
  synchronous motor.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 heavily loaded and over excited
 heavily loaded and underexcited
 lightly loaded and underecited

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Electrical Machines
Which motor used in Lathe machine?

  D.C. shunt motor.
  D.C . series motor.
  D.C. cumulative compound motor.
None of these

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Electrical Machines
What is the full form of MNP?

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

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MORE MCQ ON Electrical Machines

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