IC engines are classified into carburetor engine and air injection engine based on the:

Question

Question

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RRB JE CBT 2 (Mechanical Engineering) ReExam Official Paper (Held On: 04 Jun, 2025)

Answer 1

Explanation:

Internal Combustion Engines (IC Engines):

Internal Combustion (IC) engines are mechanical devices that convert chemical energy from fuel into mechanical energy by burning the fuel-air mixture inside a combustion chamber. These engines are widely used in automobiles, power plants, and other industrial applications. Depending on various parameters, IC engines are classified into different categories. One such classification is based on the method of fuel injection, which divides IC engines into carburetor engines and air injection engines.

Method of Fuel Injection

This classification is based on how the fuel is supplied to the combustion chamber:

Carburetor Engine: In this type of engine, a carburetor is used to mix air and fuel in the correct proportion before it enters the combustion chamber. The carburetor plays a crucial role in maintaining the air-fuel ratio, ensuring proper combustion. These engines are commonly found in older vehicles and smaller engines, such as motorcycles and lawnmowers. However, carburetor engines have been largely replaced by more advanced fuel injection systems in modern vehicles due to their limitations in efficiency and precision.
Air Injection Engine: In air injection engines, fuel is injected directly into the combustion chamber using a high-pressure air stream. This method ensures better atomization of fuel, leading to improved combustion efficiency and reduced emissions. Air injection engines are often used in heavy-duty applications, such as large diesel engines, where precise fuel delivery and combustion control are crucial.