An $18\mathrm{.}65$ kW$,4-$pole, $50$ Hz$,3-$phase induction

motor has friction and windage losses of $2\mathrm{.}5\%$ of

the output. The full load slip is $4\%.$ Compute for

full load $($a$)$ the rotor copper loss $($b$)$ the rotor

input $($c$)$ the shaft torque $($d$)$ the gross

electromagnetic torque