🔍 Key Concepts

• Observe the direction of fresh air flow from the inlet ports and the direction of exhaust gas flow out of the cylinder in the figure. • Compare the pattern you see with the standard scavenging types: cross flow, loop, and uniflow scavenging used in two-stroke diesels. • Remember that "pressurized differential" describes how air is supplied (by a blower or turbocharger), not the geometric flow pattern inside the cylinder.

💭 Think About

• Does the fresh air enter low in the cylinder and exit through valves or ports at the very top, or does it move across the cylinder from one side to the other? • Are both inlet and exhaust ports located on the same side of the cylinder forming a loop, or are they on opposite sides with flow sweeping straight through? • Ask yourself which option refers to a flow pattern inside the cylinder, and which refers instead to a method of charging/scavenging pressure.

✅ Before You Answer

• Identify the location of the exhaust outlet (top vs side ports) in the illustration. • Note whether the piston crown is deflected or shaped to turn the scavenging air (typical of one specific pattern). • Eliminate any choices that are not a flow-pattern name but rather a description of pressure or charging method.