iii. The DC machine torque versus speed curve is shown in the figure below for the rated supply voltage of 36 V . On the figure, sketch the new torque versus speed curve for a supply voltage of 18 V . iv. The DC machine torque versus speed curve is shown in the figures below for the 36 V supply voltage and the values of
R_(w)
and
k
given above. When operating from this 36 V supply, sketch the new torque versus speed curves for the cases where first the value of
R_(w)
is doubled, and secondly the value of
k
is doubled (but
R_(w)
is at its original value).