WorksheetsAnalysing Failure (SPC) - Unit 11: Maintenance
Total questions: 36
Worksheet time: 18mins
What does the term 'SPC' stand for?
Statistical Process Control
Standard Process Control
Systematic Process Control
Scientific Process Control
SPC is an acronym for Statistical Process Control. True or False?
True
False
What is an abbreviation?
A type of abbreviation where a new word is formed from the first letters of a series of words
A shortened or contracted form of a word or phrase
A long form of a word
A type of sentence.
What is the purpose of measuring data over a period of time in Statistical Process Control?
To find out how the data varies over-time
To ignore data variations
To increase data complexity
To reduce data size
In Statistical Process Control, measuring data over time is basically _________.
condition-based monitoring
random sampling
data ignoring
data simplification
What is the mean in a data set?
The highest value
The lowest value
An average value of the data set which accounts for all values
A random value
Variance is a statistical measurement of the ______ between numbers in a data set.
average
spread
sum
difference
Standard deviation is a quantity expressing how much members of a group differ from the ______ value.
median
mode
mean
range
What does 'n' represent in statistical terms?
Number of data points
Population standard deviation
Mean of the data
Upper control limit.
Fill in the blank: The symbol 'μ' represents the ______ of the data.
Upper control limit
Mean
Population standard deviation
Lower control limit
What is the meaning of UCL in statistical terms?
Lower control limit
Upper control limit
Mean of the data
Population standard deviation
Fill in the blank: LCL stands for ______ control limit.
Upper
Lower
Mean
Population
What does the population standard deviation represent?
Number of data points
Variability within a population
Mean of the data
Control limits.
What is the main difference between a population and a sample in statistics?
A) A population includes all members of a group, while a sample includes only a part of the group.
B) A sample includes all members of a group, while a population includes only a part of the group.
C) A population and a sample are the same.
D) A sample is larger than a population.
In the context of statistics, a _______ is a subset of a population used to represent the entire group.
sample
population
individual
group
What is the formula for calculating the mean (x̄) of a set of data points?
x̄ = Σxi / n
x̄ = Σxi * n
x̄ = Σxi + n
x̄ = Σxi - n
Fill in the blank: The mean (μ) of a population is calculated by dividing the sum of all data points by the ______.
total number of data points
sum of the data points
difference of the data points
product of the data points
Fill in the blank: In the formula for calculating the standard deviation of a sample, 'n-1' is used instead of 'n' to account for the ______.
Sample Bias
Population Size
Sample Size
Population Bias
What does UCL stand for in a control chart?
Upper Control Limit
Under Control Line
Uniform Control Level
Ultimate Control Limit
In a control chart, the control limits are typically set at +/- how many standard deviations from the mean value? Fill in the blank: The control limits are set at +/- ___ standard deviations.
One
Two
Three
Four
What does UCL stand for in statistical process control?
Upper Control Limit
Under Control Level
Upper Calculation Line
Uncontrolled Limit
Fill in the blank: In statistical process control, LCL stands for ______.
A) Lower Control Limit
B) Lowest Calculation Level
C) Limit Control Line
D) Lower Calculation Limit
What is the purpose of continually tracking a process and updating the SPC chart?
To make a visual representation of the process
To ignore the process
To complicate the process
To hide the process
By continually tracking our process and updating the SPC chart, we can identify when the process is ______.
in control
out of control
irrelevant
perfect
What is the primary function of ball bearings in machinery?
To reduce friction
To increase friction
To generate heat
To cool down the system.
Ball bearings are used to _______ friction in rotating parts.
increase
reduce
maintain
ignore
What does the term 'CNC' stand for?
Computer Numerical Control
Central Numeric Control
Computer Network Control
Central Network Control
What is a spindle bearing specifically designed to support?
Rotational motion of a spindle
Linear motion of a spindle
Vibrational motion of a spindle
None of the above.
Spindles are used in various machines and equipment to hold and rotate ______.
Cutting tools
Measuring tools
Fastening tools
Painting tools
What is an important KPI influencing machining precision?
Spindle speed
Spindle temperature field
Cutting force
Geometric alignment.
What percentage of these errors are thermal?
50%
60%
70%
80%
What is one of the effects of temperature gradients in machine tool structures?
Increased speed
Expansion and contraction of machine parts
Reduced noise
Enhanced color
Temperature gradients in machine tool structures result in _______ and contraction of machine parts.
expansion
reduction
cooling
heating
What happens to the bearing friction heat production when the bearing speed increases?
It decreases
It remains the same
It is intensified
It disappears
Which of the following is a cause of spindle fault?
Insufficient lubrication
Excessive lubrication
Proper alignment
Regular maintenance
Fill in the blank: One of the causes of spindle fault is _________.
A) Bearing degradation
B) Regular maintenance
C) Proper alignment
D) Excessive lubrication
