Question:
The compression ratios for diesel engines lie in the range of :
The compression ratios for diesel engines lie in the range of :
Show Hint
Diesel engines are compression-ignition engines and require high compression ratios (\( 15 \) to \( 20 \)) to generate sufficient heat to auto-ignite the injected fuel.
In contrast, petrol engines operate at lower ratios (\( 6 \) to \( 10 \)) to avoid knocking.
In contrast, petrol engines operate at lower ratios (\( 6 \) to \( 10 \)) to avoid knocking.
Updated On: Jul 21, 2026
- 30 to 40
- 5 to 8
- 15 to 20
- 3 to 6
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
The compression ratio (\( r \)) of an internal combustion engine is the ratio of the volume of the cylinder when the piston is at Bottom Dead Center (BDC) to the volume when the piston is at Top Dead Center (TDC).
Different engine types require different compression ratios depending on their ignition mechanism.
Step 2: Detailed Explanation:
Let us compare compression ratios across engine types:
- Petrol (Spark-Ignition) engines use a spark plug to ignite a pre-mixed air-fuel mixture.
Their compression ratios are kept relatively low (typically 6 to 10) to prevent premature auto-ignition (knocking).
- Diesel (Compression-Ignition) engines do not have spark plugs.
They rely on high compression to heat the air in the cylinder to a temperature above the self-ignition point of diesel fuel.
When fuel is injected, it ignites spontaneously.
To achieve this high temperature, diesel engines must operate at high compression ratios, typically in the range of 15 to 20 (or up to 22).
Therefore, option 3 is the correct range.
Step 3: Final Answer:
The compression ratio for diesel engines lies in the range of 15 to 20.
The compression ratio (\( r \)) of an internal combustion engine is the ratio of the volume of the cylinder when the piston is at Bottom Dead Center (BDC) to the volume when the piston is at Top Dead Center (TDC).
Different engine types require different compression ratios depending on their ignition mechanism.
Step 2: Detailed Explanation:
Let us compare compression ratios across engine types:
- Petrol (Spark-Ignition) engines use a spark plug to ignite a pre-mixed air-fuel mixture.
Their compression ratios are kept relatively low (typically 6 to 10) to prevent premature auto-ignition (knocking).
- Diesel (Compression-Ignition) engines do not have spark plugs.
They rely on high compression to heat the air in the cylinder to a temperature above the self-ignition point of diesel fuel.
When fuel is injected, it ignites spontaneously.
To achieve this high temperature, diesel engines must operate at high compression ratios, typically in the range of 15 to 20 (or up to 22).
Therefore, option 3 is the correct range.
Step 3: Final Answer:
The compression ratio for diesel engines lies in the range of 15 to 20.
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