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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 3 or 4
 2
 1

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Inversely proportional to the armature current.
 Proportional to the square of armature current.
 Proportional to the armature current.
 None of above.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 66.3%
 57.7%
 33.3%

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 where greater load is connected.
  high current and low voltage applications.
 high voltage and low current applications.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 2.5Hz
 1 Hz
 2HZ

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

 cumulative compound generators
 series generators
 shunt generators
 differential compound generators

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