0

Statistical Quality Control Mcqs

Q:

Control chart is a useful ______

A) manufacturing process B) process monitoring technique
C) off-line quality control tool D) part of acceptance sampling techniques
 
Answer & Explanation Answer: B) process monitoring technique

Explanation: Control chart is a very useful part of process monitoring tool, as it can only give information if the process is going out of control.

View Answer Discuss

1026
Q:

If for a process, 18 out of 20 points are plotted above the CL but below the upper control limit, and only 2 of 20 are plotted between the center line and the lower control limit, what can we say about the process state?

A) In-control B) Out-of-control
C) Data is not enough to predict D) Process state is not dependent over this data
 
Answer & Explanation Answer: B) Out-of-control

Explanation: The above question concludes a systematic pattern. For a process to be perfectly in-control state, the plotted points on the corresponding control chart should have an essentially random pattern.

View Answer Discuss

1016
Q:

Process capability generally uses __________

A) Specifications B) Control Limits
C) Process standard deviation D) Mean of any one sample
 
Answer & Explanation Answer: B) Control Limits

Explanation: Process capability studies make use of the specifications of any certain Critical-to-quality characteristic or quality characteristic to estimate the performance of any process.

View Answer Discuss

1008
Q:

A tolerance diagram is also called ____________

A) Scatter diagram B) Defect concentration diagram
C) Histogram D) Tier chart
 
Answer & Explanation Answer: D) Tier chart

Explanation: The run chart of individual observations in each sample is called the tolerance diagram for any process. The tolerance diagram is also called Tier chart of the process.

View Answer Discuss

960
Q:

The center line for a x¯¯ chart denotes ________

A) Mean of any sample B) Mean of means of the sample
C) Mean of any sample + 0.5 D) (Mean of any sample) / 0.5
 
Answer & Explanation Answer: B) Mean of means of the sample

Explanation: The center line for a x¯¯ chart is generally mean of means of all the samples taken from a process. This gives more accurate results than choosing the mean of any sample to be taken as Center line.

View Answer Discuss

731
Q:

The uncontrollable factors are the factor ___________

A) That varies according to a normal distribution B) That does not vary at all
C) That can be controlled by the user D) That cannot be changed according to the wish of the user
 
Answer & Explanation Answer: D) That cannot be changed according to the wish of the user

Explanation: There are two types of factors present with a process input while running period of a process, the controllable, and the uncontrollable input factors. The factors, which can be changed according to user’s wish, are called the uncontrollable factors.

View Answer Discuss

702
Q:

The natural variability of the process is measured by ____________

A) Process mean B) Sample standard deviation
C) Process standard deviation D) Sample mean
 
Answer & Explanation Answer: C) Process standard deviation

Explanation: The natural variability of any process is the main factor affecting the control limits of any quality characteristic while plotting a control chart. They are measured by process standard deviation, ?.

View Answer Discuss

468
Q:

The average value of the quality characteristic corresponding to in-control state is represented by _____ in the control charts.

A) CL B) UCL
C) LCL D) Sample number
 
Answer & Explanation Answer: A) CL

Explanation: The control chart contains a centre line (CL) that represents the average value of the quality characteristic corresponding to in-control state. This may be the desired value of that quality characteristic.

View Answer Discuss

399