Question

Sienna made a chart listing the steps that describe how a four-stroke heat engine operates. Which best describes Sienna’s error?

Answer 1

C. "Compression happens before ignition, so it should be step 2."

Step-by-step explanation:

The correct order of a four-stroke heat engine is:

Step 1: Intake - The engine intakes a fuel-air mixture and the piston moves down

Step 2: Compression - The piston moves up, compressing the fuel-air mixture and causing a temperature increase due to the reduced space

Step 3: Ignition - The high temperature causes a spark plug to fire, making the already-compressed gas combust and pushes the piston down.

Step 4: Exhaust - The piston moves up, pushing the gas through the exhaust valve of the engine

Answer 2

compression happens before ignition so it would be step 2