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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 S.Ns
 Nr
 Ns

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same frequency
 same prime mover speed
 same voltage magnitude
 same phase sequence

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and interpolar axis
 direct axis and interpolar axis
 quadrature axis and direct axis
 direct axis and indirect axis

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Electrical Machines
Armature reaction in DC generators will result in

 short circuit.
 reduction in generated emf.
 increase in slip.
 open circuit.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Series motor.
 Shunt motor.
 Cummulative compound motor.
 Differential compound motor.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high torque motor.
  low horse power motor.
  high speed motor.
  single phase induction motor.

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MORE MCQ ON Electrical Machines

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