A 500/250v, 5 kva two-winding transformer is to be used as an auto transformer to supply a 500 v circuit from a 750 v source at 50 hz (as shown below). When tested as a two-winding transformer at rated load, it yielded an efficiency of 96% at 0.8 pf lagging.
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Explanation:
Tggjhguijdyujjjj is a line which meets the x axis
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