_ The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and ≈í‚â• = Ratio of specific heats)$?

_ The air standard efficiency of an I.C. engine is given by (where r =

1.	_ The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and ≈í‚â• = Ratio of specific heats)$?
A.	1 - r≈í‚â• - 1
B.	1 + r≈í‚â• - 1
C.	1 - (1/r≈í‚â• - 1)
D.	None of these
Answer» D. None of these