In the illustration, the intake valve closes...

Question 1 / 2707066636eef28f7522a1c51fceb

Question 1 of 2707066636eef28f7522a1c51fceb

In the illustration, the intake valve closes at what point on the four-stroke cycle engine diagram shown? Illustration MO-0084

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Question 1 of 27070

In the illustration, the intake valve closes at what point on the four-stroke cycle engine diagram shown? Illustration MO-0084

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Carefully identify which colored band or shaded area in the diagram represents the intake valve open period versus the exhaust and fuel events. • Note the direction of crankshaft rotation shown by the arrow, and how angles are measured before and after TDC/BDC. • Recall that on a four-stroke engine, the intake valve typically opens before TDC and closes after BDC to use inlet air inertia (valve timing and overlap).

💭 Think About

• Which circular band (outer, middle, or inner) is labeled with the intake stroke, and where along that band does the shading stop as the crank rotates? • Starting from TDC at the beginning of the intake stroke, follow the rotation arrow through BDC: at what angle past BDC does the intake band end? • How do the angle labels (45°, 55°, 75°, 85°) on the diagram line up with the point where the intake shading ends relative to BDC and TDC?

✅ Before You Answer

• Make sure you are reading angles in the same direction as engine rotation, not backwards. • Confirm whether the relevant angle is measured from BDC or TDC; check the text next to the arrow in the diagram. • Verify that the point you pick is where the intake valve just finishes closing (end of the shaded intake band), not where it opens or where another valve event begins.

Question 1 of 27070

In the illustration, the intake valve closes at what point on the four-stroke cycle engine diagram shown? Illustration MO-0084

45 degrees after BDC

55 degrees before BDC

75 degrees before TDC

85 degrees after TDC

Question 1 / 2707066636eef28f7522a1c51fceb

Question 1 of 2707066636eef28f7522a1c51fceb

In the illustration, the intake valve closes at what point on the four-stroke cycle engine diagram shown? Illustration MO-0084

Back

Question 1 of 27070

In the illustration, the intake valve closes at what point on the four-stroke cycle engine diagram shown? Illustration MO-0084

If the question has a related picture, it will appear here.