This set of Total Quality Management Multiple Choice Questions & Answers (MCQs) focuses on “Process Capability”.
1. In the jargon of statistical process control, USL and LSL are known as _______ and _____ respectively.
a) Upper specification limit, Lower specification limit
b) Upper specification limit, Limit specification limit
c) Up specification limit, Limit specification limit
d) Up specification limit, Lower specification limit
View Answer
Explanation: In the jargon of statistical process control, USL and LSL are known as Upper specification limit and Lower specification limit respectively. Specification limits are usually determined from customer requirements.
2. Specification limits are also known as ________ of the product.
a) Mode
b) Median
c) Tolerances
d) Allowances
View Answer
Explanation: Specification limits are also known as tolerances of the product. There are two types of specification limits known as upper specification limit and lower specification limit.
3. If a product falls in the range of USL-LSL then it is meeting the expectation of the customer.
a) True
b) False
View Answer
Explanation: If a product falls in the range of USL-LSL then it is meeting the expectation of the customer. Specification limits are also known as the tolerance of the product. There is not much we can do about the specification limits but we can monitor the control limits.
4. Tolerance limits are the voice of the customer.
a) True
b) False
View Answer
Explanation: Tolerance limits are the voice of the customer. While the control limits are the voice of the process. Specification limits are defined by the customer while the control limits are calculated from data.
5. Natural tolerance is also known as _______
a) Specification limits
b) Control limit
c) Process capability
d) Mean
View Answer
Explanation: Natural tolerance is also known as process capability. Process capability is also known as 6σ. It compares process output with customer specification limits.
6. The upper specification limit of a product is 20.05 mm and the lower specification limit of the same product is 19.95 mm. The standard deviation is 0.25 mm. What is the value of the process capability index Cp?
a) 0.0424
b) 0.8324
c) 0.0234
d) 0.0667
View Answer
Explanation: The process capability index Cp is given by the formula Cp=(USL-LSL)/6σ. So, Cp=(20.05-19.95)/(6*0.25)=0.0667. It is widely utilized in product design phase and pilot production phase.
7. What is the interpretation of Cp>1?
a) The process cannot meet the specification
b) The process will meet the specification
c) The process is just meeting the specification
d) No interpretation is possible
View Answer
Explanation: The interpretation of Cp>1 is that the process will meet the specification. The numerator shows the specification limits determined from the customer and the denominator is the process capability. The ratio, greater than 1 implies that process capability lies within the specification limits.
8. Find the correct order of matching from the option given below.
| A) Cp> 1 | i) The process will meet the specification |
| B) Cp=1 | ii) The process will just meet the specification |
| C) Cp< 1 | iii) The process will not meet the specification |
a) A-i, B-ii, C-iii
b) A-i, B-iii, C-ii
c) A-ii, B-i, C-iii
d) A-ii, B-iii, C-i
View Answer
Explanation: The correct order of matching is given by option a). Larger the value of process capability index, better is the quality. The Process Capability needs to improve and realistic Specification Limits must be set.
9. What is the interpretation of Cpk=Cp?
a) The process is out of control
b) The process is customer-centric
c) The process is centered
d) The process is costly
View Answer
Explanation: The interpretation of Cpk=Cp is that the process is centered. In addition to this, the value of Cpk is always less than or equal to Cp.
Sanfoundry Global Education & Learning Series – Total Quality Management.
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