During which stroke is full air charge drawn into the cylinder of a four-stroke Diesel engine?

During which stroke is full air charge drawn into the cylinder of a four-stroke Diesel engine?

• A. Power
• B. Compression
• C. Intake
• D. Exhaust

Answer: (C)

In a four-stroke Diesel engine, the intake stroke is the phase during which the piston moves down in the cylinder, creating a vacuum that allows air to be drawn in through the intake valve. This is when a full charge of air enters the cylinder, filling it to prepare for the subsequent compression stroke. During this stroke, the intake valves are open, and the atmospheric pressure outside the cylinder forces air into it, allowing the engine to fill with the appropriate amount of air necessary for combustion. This process is crucial because the efficiency and power output of the engine depend heavily on having the correct air charge for proper combustion of the fuel that will be injected later. Other strokes, such as the power stroke, compression stroke, and exhaust stroke, serve different purposes in the engine cycle and do not involve drawing in air into the cylinder. The power stroke utilizes the energy from combustion, the compression stroke compresses the air to a high pressure and temperature before fuel injection, and the exhaust stroke expels the burnt gases from the cylinder.

In a four-stroke Diesel engine, the intake stroke is the phase during which the piston moves down in the cylinder, creating a vacuum that allows air to be drawn in through the intake valve. This is when a full charge of air enters the cylinder, filling it to prepare for the subsequent compression stroke.

During this stroke, the intake valves are open, and the atmospheric pressure outside the cylinder forces air into it, allowing the engine to fill with the appropriate amount of air necessary for combustion. This process is crucial because the efficiency and power output of the engine depend heavily on having the correct air charge for proper combustion of the fuel that will be injected later.

Other strokes, such as the power stroke, compression stroke, and exhaust stroke, serve different purposes in the engine cycle and do not involve drawing in air into the cylinder. The power stroke utilizes the energy from combustion, the compression stroke compresses the air to a high pressure and temperature before fuel injection, and the exhaust stroke expels the burnt gases from the cylinder.