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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - star
 Delta - delta
 Star - delta

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.
  DC of slip frequency.
 DC.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 0°.
 45°.
 30°.
  75°.

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Electrical Machines
In DC generator, brushes are always placed along

 load axis.
 armature axis.
 geometrical neutral axis.
  magnetic neutral axis.

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Electrical Machines
Generators work on the principle of production of

 dynamically and statically induced emf.
 statically induced emf.
 dynamically induced emf.
None of these

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 shunt.
 cumulative compound.
 differential compound.
 series.

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