Card 15 / 35: A reciprocating, spark ignition engine takes in an air-fuel mixture at 20°C. It has a compression ratio of 12. The air-to-fuel ratio is 14, and the heating value of the fuel is 70,000 kJ/kg. For an air standard cycle analysis, what is the thermal efficiency? You may assume Cv is approximately 0.7 kJ/kg K and that k=Cp/Cv = 1.4.
A)
50%
B)
66%
C)
63%
D)
75%
E)
89%
Answer:
C) 63%
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