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Electrical Machines

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

  270.
 45.
 180.
 30.

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing the field current.
 increasing field current.
 reversing field electric current as well as direction of rotation.
 any of above.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  repulsion motor.
  transformer.
  asynchronous motor.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 both A and B
 constant loss
 variable loss

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On armature.
  On yoke in the pole faces.
None of these
 On yoke in the inter pole gap.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 230 V
 115 V
 460 V

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