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

Explanation

A flex-fuel engine can run on biofuel and gasoline blended in any proportion.

A sensor detects the blend and adjusts the engine automatically.

Running exclusively on biofuel describes a dedicated, not a flex-fuel, engine.

Being fixed at a 50-50 blend contradicts the flexible nature of these engines.

Running on diesel and CNG describes a dual-fuel engine, a different system.

Ethanol-blended petrol is the common fuel for flex-fuel vehicles in India.

Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.