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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?

 45.
 30.
 180.
  270.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 heavily loaded and over excited
 lightly loaded and over excited
 heavily loaded and underexcited
 lightly loaded and underecited

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Cumulative compound motor.
  Series motor.
  Differential compound motor.
  Shunt motor.

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Electrical Machines
Compensating winding is placed in the

 pole shoe
 armature core
All of these
 main field

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 shunt field connections.
 armature or field connections.
 series field connections.
 armature connections.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 800 Amp.
 320 Amp.
  400 Amp.
  0.5 Amp.

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