Question

Which of the following is true for the HCCI engine?

(a) Emits high NOx and soot

(b) Have a large power range

(c) Efficiency is comparatively less

(d) Pre-catalyst hydrocarbon emissions are higher

I got this question by my college director while I was bunking the class.

Origin of the question is Nonconventional Engines in portion Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

Answer 1

Right option is (d) Pre-catalyst hydrocarbon emissions are higher

The explanation: Pre-catalyst hydrocarbon emissions are higher is one of the disadvantages of the HCCI engine. The advantages of the HCCI engine are NOx and soot emissions are almost negligible.