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Electrical Machines

Electrical Machines
A motor operates in stable region at which of the following slip?

 low slip region
 high slip region
 unity slip
 both 1 and 2

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

  more than that of second transformer.
 less than that of second transformer.
 equal to that of second transformer.
 none of these.

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Partial motor.
 DC shunt motor.
 Universal motor.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  data provided is insufficient.
  4.
 6.
  2.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 30.
 45.
 180.

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 electromechanical energy conversion.
 generation of voltage.
 commutation.
 development of torque.

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