Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
As compared to diesel, the heating value and exhaust emissions such as CO, CO₂ and smoke density of biodiesel when used in compression ignition engine are
Options:
(A) Lower and higher respectively
(B) Higher and lower respectively
(C) Lower and lower respectively
(D) Higher and higher respectively
Official Answer Key:
C
Step-by-Step Solution & Explanation
Biodiesel has a lower calorific/heating value than diesel (≈37–40 MJ/kg vs ≈45 MJ/kg) due to its oxygen content, but that same oxygen content promotes more complete combustion, so CO, CO₂ and smoke/particulate emissions are lower. Answer: Lower and lower respectively.
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