Piston Rings for an Automotive Engine Are Produced by a Forging

question 6

Multiple Choice

Piston rings for an automotive engine are produced by a forging process.We wish to monitor the inside diameter of the rings manufactured by this process using an and an s control chart.Samples of size 4 are to be taken at regular intervals,and the sample means and standard deviations are computed and plotted on the charts in time order.The target values for the inside diameter are a mean of  = 75 millimeters and a standard deviation of  = 0.02 millimeters.The control chart constants are (partially) reproduced below. What is the lower control limit for the s chart?

• A)-0.04 millimeters
• B)0 millimeters
• C)0.018 millimeters
• D)0.02 millimeters

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Definitions:

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