AG Mechanics CDE Practice Exam 2025 - Free AG Mechanics Practice Questions and Study Guide

Question: 1 / 400

What is the most common angle on a valve face?

30 degrees

Valve faces are typically cut at an angle to create a sealing surface between the valve and valve seat. The most commonly used angle is 30 degrees because it provides a good balance between flow and durability.

Options B, C, and D are incorrect because they are not as commonly used as 30 degrees. Option B of 31 degrees is only slightly different and does not offer significant advantages. Option C of 45 degrees is used for high-performance engines, but it can lead to overheating and valve failure in regular use. Option D of 46 degrees is used for drag racing engines, but it can cause loss of power and increased wear in regular use. Therefore, 30 degrees is the most common and practical angle used for valve faces.

Get further explanation with Examzify DeepDiveBeta

31 degrees

45 degrees

46 degrees

Next Question

Report this question

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy