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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

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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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