Choose the correct answer. in a symmetrical aerofoil the mean camber line is & why? (a) a line joining points of mean camber along the wing. (b) a line joining points of maximum camber along the wing.(c) a curve co-incident with the top surface of the aerofoil. (d) a straight line co-incident with the chord line.

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?