Question:
White smoke indicates -
White smoke indicates -
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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.
Updated On: Jun 2, 2026
- Lubricating oil burning in cylinder
- Presence of water in fuel
- Excessive load on engine
- Rich fuel-air mixture Correct Answer: (B) Presence of water in fuel
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Exhaust smoke coloration serves as an essential diagnostic indicator for internal combustion engines, directly signaling specific combustion abnormalities, fuel contamination, or structural wear within the engine block.
Step 2: Detailed Explanation:
White smoke emerges from the exhaust system when water or raw unburnt fuel vaporizes inside the high-temperature combustion chamber. The most frequent cause is the presence of water within the fuel supply line or coolant leaking into the cylinders via a blown head gasket. For comparison:
• Blue or grey smoke indicates that lubricating oil is slipping past worn piston rings and burning inside the cylinder.
• Black smoke indicates an overly rich fuel-air mixture, inadequate air supply, or excessive structural load on the engine, causing incomplete carbon combustion.
Step 3: Final Answer
The discharge of white smoke indicates the presence of water or moisture in the fuel system.
Exhaust smoke coloration serves as an essential diagnostic indicator for internal combustion engines, directly signaling specific combustion abnormalities, fuel contamination, or structural wear within the engine block.
Step 2: Detailed Explanation:
White smoke emerges from the exhaust system when water or raw unburnt fuel vaporizes inside the high-temperature combustion chamber. The most frequent cause is the presence of water within the fuel supply line or coolant leaking into the cylinders via a blown head gasket. For comparison:
• Blue or grey smoke indicates that lubricating oil is slipping past worn piston rings and burning inside the cylinder.
• Black smoke indicates an overly rich fuel-air mixture, inadequate air supply, or excessive structural load on the engine, causing incomplete carbon combustion.
Step 3: Final Answer
The discharge of white smoke indicates the presence of water or moisture in the fuel system.
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