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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - star
 Star - delta
 Delta - delta

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Electrical Machines
In escalator which motor is used?

  Universal motor.
  3 - φ IM.
  DC shunt motor.
  1 - φ IM.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

None of these
 same in both methods
 armature resistance control
 field weakening method

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to provide better flux linkage.
  to reduce eddy current loss.
  to reduce hysteresis loss.
  to reduce mechanical losses.

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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?

  2.
 6.
  data provided is insufficient.
  4.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia
 1/Ia
 I/Ia2
 Ia2

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