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The valve seat performs two functions: It provides a seal for the valve in the combustion chamber, and it provides a cool surface to carry heat away from the valve. Most valves use a _______-degree seating angle. A. 30 B. 60 C. 45 D. 15

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In automobile machines, the valve seat usually has a 45° angle. This is the optimum angle opening for the valve seat to maintain a straight lever head. Other designs include a 30° angle cut behind the valve seat for smoother transition. The answer is C. 45°.

Answer:

45 degrees

Explanation: