$4\mathrm{.}33$ A dc shunt machine $(23$ kW$,230$ V$,1500$ rpm$)$ has Ra $=0\mathrm{.}11.1.$ The de machine is connected to a $230$ V supply. It runs at $1500$ rpm at no$-$load and $1480$ rpm at full$-$load armature current. $($a$)$ Determine the generated voltage at full load. $($b$)$ Determine the percentage reduction of flux in the machine due to armature reaction at full$-$load condition. $2.$ The de machine now operates as a separately excited generator and the field current is kept the same as in part $1.$ It delivers full load at rated voltage. $($a$)$ Determine the generated voltage at full load. $($b$)$ Determine the speed at which the machine is driven. $($c$)$ Determine the terminal voltage i the load is thrown off.