Question

Which of the following factors affecting combustion in the CI engine?

(a) intake pressure

(b) engine speed

(c) load and air to fuel ratio

(d) all of the mentioned

I had been asked this question in an interview.

The doubt is from Combustion in C.I. Engine topic in division Combustion and Combustion Chambers of IC Engine

Answer 1

The correct answer is:

(d) all of the mentioned

Explanation: All the listed factors affect combustion in a Compression Ignition (C.I.) engine:

• Intake pressure: The pressure of the air entering the engine affects the air-fuel mixture and the combustion process. Higher intake pressure can improve air density, leading to better combustion efficiency and power output.

• Engine speed: Engine speed (RPM) influences the time available for fuel injection and combustion. At higher speeds, the combustion process must occur more rapidly, affecting efficiency and emissions.

• Load and air-to-fuel ratio: The engine load determines how much fuel is injected and how much air is required. A proper air-to-fuel ratio ensures efficient combustion. If the mixture is too rich or too lean, it can lead to incomplete combustion, reduced performance, and higher emissions.

Thus, all of these factors play a role in optimizing combustion and engine performance.