(b) Sketch carefully proportioned qualitative graphs of nm, nfis nv,and (F/A)/(F/A)stoich versus speed N at full load, and explain the reasons for the shapes of the curves. Then explain why the maximum bmep versus speed curve has the shape shown in the figure. Full load line dowy F 31 Speed (c) The minimum brake specific fuel consumption point is indicated by the asterisk (*) in the figure. Explain why brake specific fuel consumption increases with (1) increasing speed, (2) increasing bmep, (3) decreasing bmep. www