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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  both A and B.
  star delta.
  DOL.
None of these

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 1
 2
 4

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  breaking torque.
  starting torque.
  cost of operation.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant V, Tst increases
 either of these
None of these
 constant supply voltage V, starting torque Tst decreases

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

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

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with armature resistance.
 DC shunt motor with field weaking control.
 DC compound motor.
 DC series motor.

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