A diesel engine is usually more efficient than a spark ignition engine because ___________
A. Diesel being a heavier hydrocarbon, release more heat per kg than gasoline
B. The air standard efficiency of diesel engine is higher than the otto cycle, at a fixed compression ratio
C. The compression ratio of diesel engine is higher than petrol engine
D. Self ignition temperature of diesel engine is higher than that of gasoline
Answer:C
A diesel engine is usually more efficient than a spark ignition engine because ___________
A. Diesel being a heavier hydrocarbon, release more heat per kg than gasoline B. The air standard efficiency of diesel engine is higher than the otto cycle, at a fixed compression ratio C. The compression ratio of diesel engine is higher than petrol engine D. Self ignition temperature of diesel engine is higher than that of gasoline