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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 74
 37
 72
 36

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 8.
 16.
  4.
 32.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 shunt generator
 cumulatively compounded generator
 series generator
 differentially compounded generator

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

  16.67%.
 18.25%.
 15.30%.
 14.28%.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in short circuit.
  Nothing will happen.
  Fail to start.
  Will results in open circuit.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.25.
 0.62.
 1.24.
 0.72.

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