What is the purpose of a pressure relief valve? What is a sequence valve? What is it purpose? What is a pressure compensated flow control valve? What is a servo valve? How does it work?
An engineer has designed a valve that will regulate water
pressure on an automobile engine. The valve was tested
on 220 engines and the mean pressure was 5.8 lbs/square
inch. Assume the standard deviation is known to be
0.6. If the valve was designed to produce a mean
pressure of 5.7 lbs/square inch, is there sufficient evidence at
the 0.02 level that the valve does not perform to the
specifications?