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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 10
 1

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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
Regenerative braking is not found in which motor?

 Induction motor.
 DC shunt.
  DC series.
 DC compound.

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Electrical Machines
Induction motor operation depends on

 rotating magnetic field.
 either of these.
None of these
 stationary magnetic field.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
All of these
 to achieve a stronger magnetic field.
 to avoid over heating.

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Electrical Machines
Swinburne's test is applicable to

 DC series motor.
 DC Shunt motor.
 DC compound motor.
 DC shunt and level Compound motor.

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