Problem:

A $8-$pole lap connected DC series motor with $864$ conductors, takes a current of $110$ A at $480$ V $.$ The armature resistance and field resistance are $0\mathrm{.}18$ and $0\mathrm{.}02$ respectively. The flux per pole is $50$ mwb$.$ Calculate:

i$)$ The speed

ii$)$ ii$)$ The gross torque.