Quiz Questions and Answers on Process Capability Cp & Cpk

This exercise includes commonly asked exam and interview questions and answers on Process Capability Indices Cp & Cpk in Six Sigma. We recommend you read this article on process capability before this exercise.

This exercise and list of Questions and answers will help you in your exam and interview and build your understanding of Process Capability and you can apply this in your design and manufacturing to deliver quality products.

Please note, Negative marking is applicable. Please do not attempt question where you are in doubt.

Quiz Questions and Answers on Process Capability Cp & Cpk

Welcome to your Quiz interview Questions and Answers on Process Capability Cp & Cpk

1. 
Which of the following are Process Capability Measurement tools?

2. 
What are possible cause of variations on manufacturing or Assembly line?

3. 
Which of the following statements are not True?

4. 
Specified diameter of a metal part is 10 ± 1mm and supplier shipped part variation lies between 9.8 to 10.7mm. Select the correct statement.

5. 
Which of the following Statements are true for process capability indices?

6. 
Calculate the Cp (Process Capability) of a process if upper specification limit is 30.5mm, Lower specification limit is 29.5mm, Process Standard deviation is 0.06 and mean is 30.1mm.

Hint
7. 
Calculate the Cpk (Process Capability Index) of a process if upper specification limit is 30.5mm, Lower specification limit is 29.5mm, Process Standard deviation is 0.06 and mean is 30.1mm.

Hint
8. 
Calculate the Standard Deviation of a process if observed values are 21, 20, 21, 21, 22

Hint
9. 
Which of following statements are not true?

10. 
What will be the value of Cpk for normally distributed centered process if the specification limits are within ±3σ from the center?

11. 
What is the value of Cpk for 6 Sigma Process?

If all of your answers are not correct, we recommend to again read this article on Process Capability Indices Cp & Cpk in Six Sigma.

2 Responses

  2. Tyler

    Your answer for question 4 is incorrect. It is impossible to know what the process width is without sufficient data to calculate process capability and establish upper and lower control limits.
    The simple fact that a batch of parts ranges from 9.8 to 10.7 does mean that the process width is 0.9.

    Your answer for number 5 is also incorrect. Normal Distribution is not a requirement for calculating process capability. Also, data is not taken from a random sample, it should be taken from a stratified sample throughout the production run. Taking a random sample would skew the data.

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