A $3$ star$-$connected salient$-$pole synchronous alternator, when feeding a lagging

load $($pf $0\mathrm{.}8),$ mimics the regulation profile of an alternator with synchronous

impedance Zs $=0\mathrm{.}1+$ j$1$ while feeding a pure inductive load it reflects the

regulation profile of an alternator Zs $=0\mathrm{.}1+$ j$2.$ Find out the regulation when

the machine is feeding a leading load that draws $1\mathrm{.}2$ pu current at $0\mathrm{.}8$ while

maintaining the rated terminal voltage.