13.
The function of conservator in a transformer is

14.
The function of breather in a transformer is

15.
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

16.
The value of flux involved m the e.m.f. equation of a transformer is

17.
In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are

18.
The changes in volume of transformer cooling oil due to variation of atmospheric tem-perature during day and night is taken care of by which part of transformer

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