Q48
In order to eliminate knocking in compression ignition engines, there should be
A.
Short delay period
AnswerB.
Late auto-ignition
C.
Low compression ratio
D.
High self ignition temperature of fuel
Answer: Option A
Solution
Answer: Option A
Solution:
In order to eliminate knocking in compression ignition engines, there should be short delay period.- Add 1% of ethyl nitrate or any nitrate to accelerate the combustion of fuel. This process is known as “Doping” and reduce delay period considerably and hence prevent diesel knock.
- For spontaneous ignition of the fuel, we require much higher temperature this can be achieved by raising the compression ratio.