Paper 1 · People, Development and Environment
UGC NET December 2022 (01.03.2023) Shift-II
What is a flex-fuel engine in motor vehicles?
AEngines which run exclusively on biofuels
BEngines which are compatible with only 50 percent biofuel and 50 percent gasoline
CEngines in which biofuel and gasoline can be put in any ratio ✓ Correct
DEngines which run on both diesel and CNG
Correct answer: (C) Engines in which biofuel and gasoline can be put in any ratio — A flex-fuel engine can take biofuel and gasoline in any ratio, so that is the answer.
Explanation
★A flex-fuel engine can take biofuel and gasoline in any ratio, so that is the answer.
★A flex-fuel engine is built to run on more than one fuel blend.
★It can use biofuel and gasoline mixed together in any proportion.
★This is why it is also called an alternative-fuel engine.
★So it is not limited to a fixed 50-50 blend or to biofuel alone.
★The mixture is typically petrol blended with ethanol.
★So the answer is engines in which biofuel and gasoline can be put in any ratio.
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