Which of the following statements describes...

🔍 Key Concepts

• Cam profile and motion – a steep change in cam radius produces rapid movement; a gradual change produces slower, smoother movement. • Direction of rotation – use the arrow on figure "B" to decide which flank of the cam causes valve opening and which causes valve closing (reseating). • Valve opening vs reseating behavior – relate the shape of the opening and closing flanks to whether motion is abrupt or gradual, and where "full opening" occurs.

💭 Think About

• Starting from the base circle where the valve is shut, follow the cam in the direction of the arrow. Does the radius increase quickly or gradually as it first leaves the base circle? What does that say about how the valve lifts? • Once the highest radius (full lift) is reached, look at how the cam radius returns to the base circle. Is the drop steep or gentle, and what does that imply about how the valve reseats? • Compare how long the cam stays near maximum radius (flat or gently curved area). Would that make full valve opening occur quickly and briefly, or slowly and over a longer rotation angle?

✅ Before You Answer

• Identify which flank of figure "B" corresponds to valve opening in the direction of rotation shown by the arrow. • Decide whether the opening flank is steeper or more gradual than the closing flank, and what that means for abrupt vs slow motion. • Confirm which of the answer choices best matches the overall behavior you see from closed → full open → closed for figure "B", not the other figures.

Which of the following statements describes the operational characteristics of figure "B" in the illustration? See illustration MO-0045.

The valve will lift abruptly.

Full valve opening will occur slowly.

The valve will reseat abruptly.

The valve gear will not bounce.

🔍 Key Concepts

💭 Think About

✅ Before You Answer