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Electrical Machines

Electrical Machines
Lamination of transformer core is made of

  silicon steel.
 wrought iron.
 cast steel.
  cast iron.

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Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 demagnetization
 cross magnetization
 magnetization

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

 8
 4
 1
 2

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the armature current will reduce.
 the motor will come to stop.
 the speed of motor will be reduced.
 the motor will attain dangerously high speed.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and load
 supply voltage
 supply voltage, frequency and load
 supply voltage and frequency

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

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

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