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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?

 72
 37
 74
 36

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Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
 armature current(Ia)
None of these
 both A and B

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
All of these
 Used as boosters in dc distribution or transmission.
 Air crafts.

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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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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/3
 1/3, 1/√3
 1/3, 1/3
 1/√3, 1/√3

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

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

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