In places with severe cold climate, the most important fuel property to be considered for running an internal combustion engine is __________.
Options:
(A) heating value
(B) flash point
(C) pour point
(D) boiling point
Official Answer Key:
C
Step-by-Step Solution & Explanation
The pour point is the lowest temperature at which a fuel still flows. In severe cold, diesel begins to form wax crystals; below the pour point it ceases to flow altogether, blocking filters and fuel lines so that the engine cannot be fed at all. It is therefore the governing property for cold-climate operation.
Why not the others:
Heating value determines the energy released per unit fuel — important for economy, but irrelevant if the fuel cannot reach the cylinder.
Flash point is a high-temperature safety property (fire and storage hazard).
Boiling point matters for volatility and distillation, not for cold flow.
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