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IEEE (4th sem) chp 3

Terms in this set (120)

_______ does not change in transformer
frequency
in transformer the energy is conveyed from primary to secondary
by flux
a transformers core is laminated to
reduce the eddy current loss
the no-load current drawn by the transformer is usually what percent of full load current ?
2 to 5 %
the path of magnetic flux in a transformer should have
low reluctance
no-load on a transformer is carried out to determine
magnetising effect and loss
the dielectric strength of the transformer oil is expected to be
33KW
sumpners test is carried out in an transformer to determine the
temperature
the permissible flux density in case of cold rolled grain oriented steel is around
1.7 Wb / m^2
the efficiency of an transformer will be maximum when the
copper losses = iron losses
no load current in an transformer
lags behind in voltage by 75 degree
The purpose of an iron core in an transformer is
To decrease the reluctance of the magnetic path
_______ is not a part of the transformer installation
Exciter
While conducting the short circuit test on a transformer the following side is short circuited
The low voltage side
In an transformer _________ side winding has got more cross sectional area
Low voltage side
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