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Mechanical Engineering · Q144

Internal Combustion Engines (I.C. Engines)

Engineering and GATE · Mechanical Engineering · question 144

Q144

The knocking tendency in compression ignition engines for a given fuel will be

A.
Enhanced by decreasing compression ratio
Answer
B.
Enhanced by increasing compression ratio
C.
Dependent on other factors
D.
None of the above

Answer: Option A

Solution

Answer: Option A
Solution:
The knocking tendency in compression ignition engines for a given fuel will be Enhanced by decreasing compression ratio. In SI engine, knocking tendency increases with increase in compression ratio. ... In CI engine, knocking tendency decreases with increase in compression ratio. If compression ratio is low in CI engine, there will not be enough temperature generation for ignition of the fuel air mixture.
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