A gasoline engine has a compression ratio of 7.00 and uses a gas for which = 1.4

Question

A gasoline engine has a compression ratio of 7.00 and uses a gas for which = 1.40. (a) What is the efficiency of the engine if itoperates in an idealized Otto cycle?

(b) If the actual efficiency is 16.0%, what fraction of thefuel is wasted as a result of friction and energy losses by heatthat could by avoided in a reversible engine? (Assume completecombustion of the air-fuel mixture.)
(a) What is the efficiency of the engine if itoperates in an idealized Otto cycle?

(b) If the actual efficiency is 16.0%, what fraction of thefuel is wasted as a result of friction and energy losses by heatthat could by avoided in a reversible engine? (Assume completecombustion of the air-fuel mixture.)

Explanation / Answer

a) the efficiency of the engine if it operates in anidealized Otto cycle is            e= 1- 1/(r-1) Here r =7.00           = 1.40 Substitute the values for e. b) the efficiency of the engine if it operates in anidealized Otto cycle is          e= 1-1/(r-1) Here e = 0.16           =1.40 Find r.          e= 1-1/(r-1) Here e = 0.16           =1.40 Find r.

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