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 higherI 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

Which of the following is true for the HCCI engine?(a) Emits high NOx

1.	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 higherI 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» 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.

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