What is the significance of an extension line in an engineering drawing? A.
the line shows the limits of a dimension
B.
the line shows dimensions not used in fabrication
C.
the line is perpendicular to the dimension line used to show a feature
D.
the line shows visible features of the figure
E.
the line shows hidden features of the figure

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?