🔍 Key Concepts
• Difference between two-stroke and four-stroke engines
• Relationship between strokes, crankshaft revolutions, and the full operating cycle (intake, compression, power, exhaust)
• How the cycle of operation is defined in internal combustion engine theory
💭 Think About
• Think about how many crankshaft revolutions are needed to complete all four events: intake, compression, power, and exhaust in common engine types.
• Ask yourself: in a two-stroke engine vs. a four-stroke engine, what actually changes in terms of the cycle and the timing of these events?
• Which option directly controls whether these events occur once every revolution, or once every two revolutions?
✅ Before You Answer
• Be clear on what a cycle of operation means: from one point in the process back to the same point again (e.g., power stroke to next power stroke).
• Identify which choice is tied to how often all four events (intake, compression, power, exhaust) repeat.
• Eliminate options that describe engine size or layout (like number of pistons or distance traveled by a piston) rather than the cycle timing itself.