$****$ I've noticed this question has been asked a few times, however question $($iii$)$ has various different answers. I$\text{'}$m only really interested in questions $($iii$)$ and question $($v$)$ please. I have question $($iii$)$ at being $0\mathrm{.}3$ Ohms. Grateful for the help$***$

The blades of a $20$ kW$,400$ V machine rotate at $2$ revs per second at rated wind speed.

$($i$)$ Calculate the speed of the generator if the gear box ratio is $1$:$10.$

$($ii$)$ Calculate the current generated at rated power.

$($iii$)$ This four$-$pole machine has lap wound armature consisting of $16$ coils each with a resistance of $0\mathrm{.}3$ ohms. Calculate the resistance of the armature.

$($iv$)$ Draw the circuit diagram for the generator with this armature winding resistance and the shunt resistance $50$ ohms.

$($v$)$ Calculate the winding losses and hence the efficiency of the wind turbine at rated wind speed.