Quality Control And Improvement

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Questions Bank

The Operations Function
Operations and Supply Chain Strategy
Product Design
Process Selection
Service Delivery System Design
Process-Flow Analysis
Lean Thinking and Lean Systems
Managing Quality
Quality Control and Improvement
Forecasting
Capacity Planning
Scheduling Operations
Project Planning and Scheduling
Independent Demand Inventory
Materials Requirements Planning and ERP
Supply Chain Management
Sourcing
Global Logistics

All Questions

Question 1

Free

Multiple Choice

Sampling inspection by attributes

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means each item sampled is classified as defective or not defective based on quality standards.

could be used together with process control and variable measurement as part of a quality control system.

utilizes a discrete scale of measurement.

a, b, and c.

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Question 2

Free

Multiple Choice

Which of the following statements about process quality control is NOT true?

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Assignable cause variation is also referred as special cause variation.

An observation outside the control limits is an example of a special cause of variation.

Common cause variation can be eliminated from the process by removing the potential causes.

The control limits will include 99.74% of the population under the normal probability distribution assuming that the process is in control.

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Question 3

Free

Multiple Choice

A Pareto diagram

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shows causes and effects of quality problems.

shows the prevalence of the various types of defects that have been found.

is not useful when first studying a quality problem.

has both upper and lower specification limits.

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Question 4

Free

Multiple Choice

A cause-and-effect diagram

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identifies common causes of quality defects .

is often used in conjunction with a Pareto chart.

is also called a fishbone diagram.

has all of the above features.

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Question 5

Free

Multiple Choice

Which of the following statements about process capability is accurate?

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C_pk is a better measure of process capability than C_p.

C_p is exactly equal to C_pk when the mean is centered in the specification limits.

Given the same process, C_pk is always less than or equal to C_p.

All of the above are accurate.

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Question 6

Multiple Choice

Suppose that a process is in a state of control and we have the following information for a human weights measurement study: Average weight of males in the study = 150 lbs.
Average range of the male weights = 100 lbs.
A₂ = .577
D₃ = 0
D₄ = 2.115
What is the upper control limit for the average (mean)chart?

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207.7 lbs

92.3 lbs

361.5 lbs

175 lbs

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Question 7

Multiple Choice

Suppose that you have taken 30 samples of 200 units each and calculated the proportion defective as p = .075.What is the upper control limit for a p-chart?

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.2192

.0191

.1309

.7500

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Question 8

Multiple Choice

Using the same data as in Question 10,what is the lower control limit for a p-chart?

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.0750

.0191

.0000

.0692

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Question 9

Multiple Choice

Of the four choices below,which is the earliest step in designing a quality control system?

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The amount of inspection to use.

Who should do the inspection.

The type of measurement to be used.

Training workers to perform inspection of their own work.

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Question 10

Multiple Choice

Which of the following is/are assumption(s)of process control?

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Random variability cannot be eliminated unless the process is redesigned.

Common causes represent random variability.

Production processes are not usually found in a state of control.

All of the above.

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Question 11

Multiple Choice

Which of the following quality control sample statistics indicates a quality characteristic that is an attribute?

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Mean

Proportion

Variance

Standard deviation

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Question 12

Multiple Choice

Which of the following techniques are used for continuous improvement?

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Pareto charts.

Cause-and-effect diagrams.

Process control charts.

All of the above

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Question 13

Multiple Choice

The ability of the process to meet,or exceed,its specifications can be determined by

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Pareto charts.

cause-and-effect diagrams.

histograms.

C_p index.

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Question 14

Multiple Choice

The chair of the Quality Department at Motorola University wants to construct a p-chart for determining whether the four faculty members teaching the course are in a state of control concerning the number of students who fail in the course.Accordingly,the chair sampled 500 final grades from last year for each instructor,and computed the number of failures per instructor as 13,11,0,and 16 respectively.Compute the upper and lower standard control limits for this chart.

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0.9500 and 0.0500.

0.0600 and 0.1400.

0.0388 and 0.0012.

None of the above.

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Question 15

Multiple Choice

A machining process is capable of producing a component with an average specification of 5 inches and a process standard deviation of 0.1 inch.Supposing the customer accepts the component as long as it falls between 4.8 inches and 5.2 inches,then the process capability is

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1.333.

1.5.

0.667.

1.0.

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Question 16

Multiple Choice

Which of the following is a critical inspection point where inspection and testing of products occur in a quality control system?

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Just prior to an irreversible operation (such as drilling).

Just prior to a masking operation (an operation that may hide a defect, such as painting or plating).

Just prior to packaging and shipping a finished product.

All of the above.

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Question 17

Multiple Choice

Generally,two types of data may be collected from sampling at an inspection point.These two types of data are

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variable and attribute data.

variable and conditional data.

constant and attribute data.

constant and conditional data.

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Question 18

Multiple Choice

Regarding the design of a quality control system,which of the following statements is correct?

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First, decide on the type of measurement required, then who will collect the data.

First, decide on the amount of inspection needed, then critical points and type of measurement needed.

First, decide who will be the inspector, then that person determines the critical points and collects the data.

Decide on the critical points first, then the type and amount of measurement needed.

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Question 19

Multiple Choice

The figure shown below represents a control chart determined from attribute data.Given this chart and the plotted observations,the most appropriate action would be

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take immediate action to identify potential causes of the variation.

decrease the confidence interval for the control chart.

do nothing because the process appears to be operating in control.

increase the confidence interval for the control chart.

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Question 20

Multiple Choice

If the population of items produced does not meet or exceed the upper and low specification limits (all items produced are well within specification limits),the process capability index,Cp,will be

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less than 0.0.

between 0.0 and 1.0.

equal to 1.0.

greater than 1.0.

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