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ELECTRICAL MACHINES

Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag delta connected.
 zig - zag star connected.
 star connected.
  delta connected.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to carry extra load.
None of these
  to suppress harmonic and unbalance in voltage.
 to interconnect three voltage systems.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 such that actual impedance of all transformers would be same.
  same.
 proportionate to MVA rating of transformers.
 inversely proportional to MVA rating of transformers.

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Electrical Machines
Tap changer is generally provided in

 earthing transformer.
 current transformer.
  power transformer.
 voltage transformer.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
All of these
  convection.
 conduction.

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