Final answer:
Tech A and Tech B are both correct regarding the inspection and machining of valve lock grooves. Tech A stresses the importance of inspection, while Tech B suggests machining when imperfections are present. Therefore , the correct answer options is c)
Step-by-step explanation:
The student's question pertains to the inspection and potential machining of valve lock grooves. Specifically, Tech A's assertion is that valve lock grooves must be inspected for rounded shoulders, which is a crucial step in maintaining the integrity of the valve mechanism.
On the other hand, Tech B believes that valve stems with rounded or uneven shoulders require machining. This statement implies that Tech B thinks that inspection alone might not be sufficient if the flaw is found, suggesting a corrective action through machining.
However, the context you provided about testing different types of valves for pressure tolerances seems irrelevant to the question about valve lock grooves. So, focusing solely on the original question about inspections and machining of valve grooves, the answer would be Both Tech A and Tech B are correct.
Tech A is correct in stating that inspections are necessary, while Tech B is right in suggesting that valves with imperfections require machining. This professional insight is pertinent to the field of mechanical engineering or automotive technology, where valve maintenance is an important factor for optimal engine performance.