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Modules / Lectures
M5Q1: Does process capability refer to the uniformity of the process?
ANS: Yes.
M5Q2: State the two reasons for poor process capability.
ANS: The two reasons for poor process capability are poor process centering and excess process variability.
M5Q3: What is the advantage of probability plot over histogram in assessing process capability?
ANS: The probability plot requires relatively small data, while the histogram requires relatively large data to assess process capability.
M5Q4: What are the measures of process capability?
ANS: The measures of process capability are Cp, Cpu, Cpl, Cpk, Cpm, Cpmk.
M5Q5: is it so that the higher is the process capability ratio the lower is the process fall out?
ANS: Yes
M5Q6: Can Cp and Cpk be negative?
ANS: Cp cannot be negative, but Cpk can be negative.
M5Q7: What is the merit of Cpm over Cp or Cpmk over Cpk?
ANS: Cp and Cpk are not the adequate measures of process centering, whereas Cpm and Cpmk are known to be the adequate measures of process centering.
M5Q8: Is it required to check the normality character of a process before finding the process capability?
ANS: Yes, otherwise the capability of the process may be misinterpreted.
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