Question

What is the efficiency of compressed charge engine?

(a) 40%

(b) 20%

(c) 30%

(d) 10%

The question was asked in examination.

I'd like to ask this question from I.C Engine in section Internal Combustion Engine of Farm Machinery

Answer 1

Correct answer is (c) 30%

For explanation I would say: As engine RPM rises, the speed of the flame front does not change so the spark point is advanced earlier in the cycle to allow greater proportions of the cycle for the charge to combust before the power stroke commences. Efficiency of compressed charge engine is 30%.