AG Mechanics CDE Practice Exam

If a valve has a 45 degree face, then the seat would be:

1. 30 degrees

2. 31 degrees

3. 45 degrees

4. 46 degrees

The correct answer is: 30 degrees

If a valve has a 45 degree face, then the seat would typically be designed to have a 30-degree angle. This is because the valve and the seat need to create a seal when closed to prevent leakage in the system. The 30-degree angle for the seat complements the 45-degree angle on the valve, allowing for a proper seal to be formed when they come into contact. Option A is the correct answer because it represents the most common angle for the seat to match a valve with a 45-degree face. Options B, C, and D are incorrect because they do not provide the appropriate angle for the seat to create a proper seal with a valve having a 45-degree face.