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Compared to petrol, CNG combustion produces 25% less of what gas?

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in Automotive Engine Design by (137k points)
Compared to petrol, CNG combustion produces 25% less of what gas?

(a) NOx

(b) H

(c) CO

(d) CO2

I have been asked this question at a job interview.

The question is from Alternative Fuels in chapter Fuels, Intake System & Leakage Preventers of Automotive Engine Design

1 Answer

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Best answer
Right answer is (d) CO2

Explanation: Compared to petrol, compressed natural gas produces about 25% less CO2 and due to high levels of methane, it gives the highest HC emission.

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