For a separately$-$excited DC motor: $3\mathrm{.}1$ Compare the drop in the speed $($from the no$-$load speed$)$ with armature resistance, for a given load. $[3]3\mathrm{.}2$ Based on $3\mathrm{.}1,$ what is the effect of armature resistance on speed regulation? $[2]3\mathrm{.}3$ Compare the drop in the speed $($from no$-$load speed$)$ with field$-$flux, for a given load. $[3]3\mathrm{.}4$ Based on $3\mathrm{.}3,$ what is the effect of field weakening on speed regulation?