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Mechanical Engineering · Q246

Internal Combustion Engines (I.C. Engines)

Engineering and GATE · Mechanical Engineering · question 246

Q246

The knocking tendency in spark ignition engines may be decreased by

A.
Controlling the air-fuel mixture
B.
Controlling the ignition timing
C.
Controlling the exhaust temperature
D.
Reducing the compression ratio
Answer

Answer: Option D

Solution

Answer: Option D
Solution:
The knocking tendency in spark ignition engines may be decreased by Reducing the compression ratio. -A lean mixture reduced the knocking tendency, allowing to operate the CFR engine at higher CCR. -The high concentration of nitrogen in the mixture increased the ignition delay time of the end gas, thus reducing the knocking tendency of the engine.
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