This set of Industrial Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Control Charts and their Applications”.
1. Which of the following are the causes for the variation of spindle diameters during the manufacturing on a general lathe?
(i) Tool wear
(ii) Non-homogeneity of the bar stock
(iii) Changes in machine settings
a) i only
b) i and ii only
c) i and iii only
d) i, ii and iii only
View Answer
Explanation: Variations in the diameters of the spindles that are manufacturing on a lathe can be due to tool wear, non-homogeneity of the bar stock, changes in machine settings. Control charts are used to detect these changes in dimensions.
2. What is a graphical presentation of the information collected through the measurement of items or samples?
a) Single sampling plan
b) Double sampling plan
c) Control chart
d) Work sampling
View Answer
Explanation: Control chart is a graphical presentation of the information collected through measurement of items or samples i.e., information about the items or samples is collected through measurement is represented on a graph for analyzing the quality levels of the items or samples.
3. A control chart is not dynamic in nature.
a) True
b) False
View Answer
Explanation: Control chart is dynamic in nature. A control chart has to be kept up-to-date as per the changes in processing conditions.
4. Control charts are revised and plotted successively since the start of the production to depict the undesired variations in the products.
a) True
b) False
View Answer
Explanation: Successively revised and plotted control charts inform about the undesired variations and helps in exploring the cause and eliminating manufacturing troubles.
5. Match the following according to their confidence levels.
p) 1σ i) 99.73% q) 2σ ii) 68.27% r) 3σ iii) 95.45%
a) p-iii, q-ii, r-i
b) p-ii, q-i, r-iii
c) p-ii, q-iii, r-i
d) p-i, q-ii, r-iii
View Answer
Explanation: The control limits of a control chart can be 1σ, 2σ, or 3σ, depending upon whether the confidence level is 68.27%, 95.45%, or 99.73% respectively.
6. Normally a control chart has 6σ spread for plotting which is referred to as the basic spread.
a) True
b) False
View Answer
Explanation: Usually for plotting control charts 3σ limits are taken, and (3σ + 3σ) i.e., 6σ spread. 6σ spread is also known as the basic spread.
7. What is the warning limits for a control chart that indicates and warns the manufacturer when the samples are approaching the danger level?
a) 1σ limits
b) 4σ spread
c) 3σ limits
d) 6σ spread
View Answer
Explanation: For a control chart with 3σ limits, warning limits are placed at 4σ spread. They inform the manufacturer about the process going out of control, in before and insist him to take necessary actions to prevent the consequences.
8. A control chart indicates whether the process is in control or out of control.
a) True
b) False
View Answer
Explanation: A control chart indicates whether the process is in control or out of control. If the plot is beyond the control limits, then the process is out of control.
9. Which of the following is/are the advantages of using a control chart for inspection?
(i) A control chart indicates whether the process is in control or out of control.
(ii) A control chart determines process variability.
(iii) A control chart ensures product quality.
(iv) Scrap or percentage reduction can be reduced by taking the necessary actions in time against the warnings indicated by control charts.
(v) Control charts build up the reputation of the organization through customer’s satisfaction.
(vi) The control chart can detect the unusual variations taking place in a process.
a) i, ii, iii only
b) i, iv, v only
c) i, ii, iii, iv, v and vi
d) iv, v and vi
View Answer
Explanation: Control charts have several advantages. They are as follows.
(i) A control chart indicates whether the process is in control or out of control.
(ii) A control chart determines process variability.
(iii) A control chart ensures product quality.
(iv) Scrap or percentage reduction can be reduced by taking the necessary actions in time against the warnings indicated by control charts.
(v) Control charts build up the reputation of the organization through customer’s satisfaction.
(vi) The control chart can detect the unusual variations taking place in a process.
10. What is an example of an attribute chart?
a) p chart
b) x – chart
c) R chart
d) σ chart
View Answer
Explanation: Control charts are of two types namely,
i. Variables or Measurement charts
ii. Attributes charts
More MCQs on Control Charts:
Sanfoundry Global Education & Learning Series – Industrial Engineering.
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