Question

White smoke indicates -

• A. Lubricating oil burning in cylinder
• B. Presence of water in fuel
• C. Excessive load on engine
• D. Rich fuel-air mixture Correct Answer: (B) Presence of water in fuel

Hint:

Engine Smoke Summary: - White Smoke: Water/moisture in fuel or coolant leak. - Black Smoke: Incomplete combustion / Excess fuel (Rich mixture). - Blue Smoke: Engine oil burning in the cylinder.

Answer 1

The Correct Option is B

Step 1: Smoke colour as a clue.
The colour of exhaust smoke tells you what is going wrong inside an engine.

Step 2: Reason out white smoke.
White smoke shows up when water or moisture gets into the fuel and turns to vapour in the hot cylinder. Blue smoke would mean oil is burning, and black smoke would mean too much fuel.

Step 3: Pick the match.
White smoke points to water in the fuel.
\[ \boxed{\text{Presence of water in fuel}} \]