Task $2$

$(20$ points$)$

A step$-$down transformer with rating of $1000-$VA $240/120$ has undergone an open$-$circuit test and a short$-$circuit test. The test results are summarized as follows:$-$

Answer the following questions:

$($a$)$ State the purposes of the above$-$mentioned open$-$circuit and short$-$circuit tests.

$(2$ pts$)$

$($b$)$ Obtain the equivalent circuit referred to the low voltage side of the transformer.

$($d$)$ Calculate the efficiency at rated conditions and $0\mathrm{.}8$ power factor lagging.

$($e$)$ Calculate the terminal voltage at the high voltage side.