Question

In a Otto cycle engine, combustion occurs at __________

(a) Constant pressure

(b) Constant temperature

(c) Constant volume

(d) Constant heat

The question was asked during a job interview.

My doubt is from Development of IC Engines topic in section Internal Combustion Engines of Automobile Engineering

Answer 1

Correct answer is (c) Constant volume

The best I can explain: Combustion process in an Otto cycle engine occurs at constant volume. Otto cycle has two isentropic processes and two constant volume processes. This cycle is mostly used for petrol engines.