In a $220$ V compound generator, the resistances of the armature, shunt and series windings are $0\mathrm{.}09$ ohms, $35$

ohms and $0\mathrm{.}06$ ohms respectively. The load current is $150$ A at $220$ V$.$ Find the induced e$.$m$.$f$.$ and the

armature current when the machine is connected as$$a$.$long$-$shunt and as$$b$.$short$-$shunt. How will the ampere$-$

turns of the series field be changed in a and b if a diverter of $0\mathrm{.}2$ ohm be connected in parallel with the series

winding? Neglect brush contact drop and ignore armature reaction.