Consider the following statements:
Diesel knock can be reduced by
1. Increasing the compression ratio.
2. Increasing the engine speed.
3. Increasing the injection retard.
4. Decreasing the inlet air temperature.
Which of the statements given above are correct?
Option (A)
2 and 4 only
Option (B)
1, 2 and, only
1 and 3 only
1, 2, 3 and 4
Correct Option:
Question Solution:
Factors tending to reduce knocking is SI and CI engine
S.No. Factors S.I. Engine C.E. engine
1. Self-ignition temperature of fuel High Low
2. Time lag or delay period for fuel Low High
3. Compression ratio Low High
4. Inlet temperature Low High
5. Inlet pressure Low High
6. Combustion chamber wall temperature Low High
7. Speed High Low
8. Cylinder size Small Large