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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  Shunt.
  Series.
  None of them.

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Electrical Machines
Which of the following generators are used in arc welding?

 series generators
 shunt generators
 cumulative compound generators
 differential compound generators

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the electrical resistivity of iron.
  increases the hysteresis loss.
  reduces the saturation magnetization.
None of these

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Electrical Machines
A compound motor has

  only series field winding.
  both shunt and series field winding.
  tertiary winding.
  only shunt field winding.

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Electrical Machines
Breadth factor is defined as the ratio of

 both 1 and 2.
None of these
 emf with distributed winding to emf with concentrated winding.
 emf with concentrated winding to emf with distributed winding.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC compound motor.
 DC Shunt motor.
 DC series motor.
 Separately excited DC motor.

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