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All of the following causes are valid for hydrocarbon emissions from SI engine, except
- a)throttling
- b)crevice volumes and flow in crevices
- c)leakage past the exhaust valve
- d)Valve overlap
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
All of the following causes are valid for hydrocarbon emissions from S...
Following are the causes for hydrocarbon emissions from SI engine:
(i) Incomplete combustion
(ii) Crevice volumes and flow in crevices
(iii) Leakage past the exhaust valve
(iv) Valve overlap
(v) Deposits on walls
(vi) Oil on combustion chamber walls
(i) Incomplete combustion
(ii) Crevice volumes and flow in crevices
(iii) Leakage past the exhaust valve
(iv) Valve overlap
(v) Deposits on walls
(vi) Oil on combustion chamber walls
Most Upvoted Answer
All of the following causes are valid for hydrocarbon emissions from S...
Throttling:
Throttling in a SI engine refers to the restriction of air intake during part load operation. This can lead to incomplete combustion of fuel, resulting in increased hydrocarbon emissions.
Crevice volumes and flow in crevices:
Crevice volumes refer to the small gaps or spaces between components in the engine where air-fuel mixture can get trapped and not completely burn. This unburned mixture can contribute to hydrocarbon emissions.
Leakage past the exhaust valve:
Leakage past the exhaust valve can occur due to wear or damage, allowing unburned fuel to escape into the exhaust system and increase hydrocarbon emissions.
Valve overlap:
Valve overlap occurs when both the intake and exhaust valves are open simultaneously during a portion of the engine cycle. This can lead to the mixing of fresh air-fuel mixture with exhaust gases, resulting in increased hydrocarbon emissions.
Throttling (Invalid):
Throttling does not directly cause hydrocarbon emissions from a SI engine. Throttling affects the air intake but does not directly impact the combustion process or the release of hydrocarbons.
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All of the following causes are valid for hydrocarbon emissions from SI engine, excepta)throttlingb)crevice volumes and flow in crevicesc)leakage past the exhaust valved)Valve overlapCorrect answer is option 'A'. Can you explain this answer?
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