Correct Answer:
The analysis of the change in reliability over time
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What is reliability centered maintenance (RCM) analysis?
Answer
Correct Answer:
A structured framework for analyzing the functions and potential failure modes for a physical asset
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What is the probability of an item operating for a given amount of time without failure?
Answer
Correct Answer:
Reliability
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Reliability is the probability of an item operating for a given amount of time without ____.
Answer
Correct Answer:
Failure
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What is the meaning of quality?
Answer
Correct Answer:
The non-quantifiable point-level excellence of a product or process
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What is the proportional hazards model?
Answer
Correct Answer:
A model that can account for multiple non-thermal stresses as acceleration factors
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How many process characteristics does a process flow diagram record?
Answer
Correct Answer:
It records the product and process characteristics that are important to keep under control.
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Which of the following is NOT a characteristic of a process flow diagram?
Answer
Correct Answer:
A high level chart
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What is probability plotting paper used for?
Answer
Correct Answer:
Plotting failure time vs. unreliability
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Which of the following is not a requirement for a probability plot?
Answer
Correct Answer:
The plotted points fall on a relatively straight line
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What is the mathematical model that describes the probability of events occurring over time called?
Answer
Correct Answer:
Probability density function
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What is the probability of an unlikely event?
Answer
Correct Answer:
Close to 0
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What is the reliability of the system if at least one path is available?
Answer
Correct Answer:
The system has not failed.
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What is the Occurrence rating?
Answer
Correct Answer:
Qualitative ratings used to estimate the likelihood of occurrence for each cause of failure.
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What is the purpose of occurrence ratings?
Answer
Correct Answer:
To estimate the likelihood of occurrence for each cause of failure
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What is the name of the mathematician who developed the normal distribution?
Answer
Correct Answer:
C. F. Gauss
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What is the main advantage of nonparametric analysis?
Answer
Correct Answer:
It avoids potentially large errors brought about by making incorrect assumptions about the distribution.
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What are the confidence bounds associated with nonparametric analysis?
Answer
Correct Answer:
Wider
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What does NHPP stand for?
Answer
Correct Answer:
Non-homogeneous Poisson process
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Which of the following is NOT a characteristic of a non-homogeneous Poisson process?
Answer
Correct Answer:
Constant failure recurrence rate
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What does "MTTR" stand for?
Answer
Correct Answer:
Mean time to repair
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What does MTTF stand for?
Answer
Correct Answer:
"mean time to failure"
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What does "MTBF" stand for in the case of repairable systems?
Answer
Correct Answer:
Mean time between failures
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What is Monte Carlo simulation?
Answer
Correct Answer:
A method of generating values from a known distribution for the purposes of experimentation.
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What is the Correct answer?
Answer
Correct Answer:
Modified Gompertz model
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What is the mode ratio?
Answer
Correct Answer:
The probability that the item's failure will be due to the failure mode under consideration.
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What represents the percentage of all failures for the item that will be due to the given mode?
Answer
Correct Answer:
Mode Ratio
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What is the purpose of a mixed Weibull distribution?
Answer
Correct Answer:
To model data with distinct subpopulations that may represent different failure characteristics over the lifetime of a product.
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What is the best estimate for unreliability based on median ranks?
Answer
Correct Answer:
50%
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What is another name for "Mean Life"?
Answer
Correct Answer:
Average Life
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What is the expected value of the failure times for a failure distribution?
Answer
Correct Answer:
Mean life
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What is the best parameter estimate obtained by MLE?
Answer
Correct Answer:
The parameter values that maximize the value of the likelihood equation for a particular data set.
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What is the definition of "Maintenance tasks"?
Answer
Correct Answer:
Activities intended to repair or maintain a system
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What is the definition of Maintainability?
Answer
Correct Answer:
The probability that a failed unit will be repaired within a given amount of time.
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What is the primary failure mode that the lognormal distribution is used to model?
Answer
Correct Answer:
Physical fatigue
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What is the Lloyd-Lipow model?
Answer
Correct Answer:
A reliability growth model based on the number of trials and successes at each stage of product development.
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What is the ratio of a likelihood function for an unknown parameter vector to the likelihood function calculated at the estimated parameter vector called?
Answer
Correct Answer:
Likelihood ratio
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What is the Maximum likelihood estimation technique?
Answer
Correct Answer:
Maximize the likelihood function to determine the best parameter estimates.
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What is the term for a relationship that describes how stress levels affect the reliability of a product?
Answer
Correct Answer:
Life-stress relationship
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What is the main purpose of life data analysis?
Answer
Correct Answer:
To mathematically model the reliability and failure characteristics of a product.
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What is left censored data?
Answer
Correct Answer:
A type of interval censored data where the failure is only known to have occurred before a specific time.
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What is the Kaplan-Meier estimator?
Answer
Correct Answer:
An estimator used to calculate the estimates of the unreliability for probability plotting purposes.
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What is the Kaplan-Meier estimator used for?
Answer
Correct Answer:
To calculate the estimates of the unreliability for probability plotting purposes
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What is an accelerated life testing model?
Answer
Correct Answer:
A model commonly used when the accelerating factor is a single, non-thermal stress.
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What is interval censored data?
Answer
Correct Answer:
Data that represents a range of time within which the unit is known to have failed
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What is the importance measure of a component?
Answer
Correct Answer:
A measure of the relative contribution of a component’s contribution to the overall system’s reliability.
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What does HALT stand for?
Answer
Correct Answer:
Highly accelerated life testing
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What does the Gompertz model produce?
Answer
Correct Answer:
S-shaped reliability growth curve
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What is the ability of the generalized gamma distribution?
Answer
Correct Answer:
To mimic the attributes of other distributions
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Which of the following is not a characteristic of the generalized gamma distribution?
Answer
Correct Answer:
The ability to mimic the attributes of other distributions
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What is the General log-linear model?
Answer
Correct Answer:
A model that can account for multiple non-thermal stresses as acceleration factors
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What does the general log-linear model allow the user to do?
Answer
Correct Answer:
Select a life-stress relationship for each stress
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What is the Fisher matrix used to determine?
Answer
Correct Answer:
The variability of estimated parameter values
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What is the Fisher matrix used for?
Answer
Correct Answer:
To determine confidence bounds when using maximum likelihood estimation (MLE) techniques.
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What are the units of the failure rate function?
Answer
Correct Answer:
Failures per unit time among surviving units
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What does FMECA stand for?
Answer
Correct Answer:
Failure modes, effects and criticality analysis
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What does the FMECA methodology include?
Answer
Correct Answer:
Criticality analysis
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What is the full form of FMEA?
Answer
Correct Answer:
Failure modes and effects analysis
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What is the full name for FMRA?
Answer
Correct Answer:
Failure modes and reliability analysis
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What does FMEA stand for?
Answer
Correct Answer:
Failure mode and effects analysis
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What is the meaning of FEC?
Answer
Correct Answer:
Failure effect categorization
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What is the mathematical model that describes the probability of failures occurring over time called?
Answer
Correct Answer:
Failure distribution
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What is the probability density function?
Answer
Correct Answer:
A mathematical model that describes the probability of failures occurring over time.
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What is the Eyring model?
Answer
Correct Answer:
An accelerated life testing model based on quantum mechanics
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What is the Exponential distribution?
Answer
Correct Answer:
A lifetime statistical distribution that assumes a constant failure rate for the product being modeled.
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What does an exponential distribution assume?
Answer
Correct Answer:
A constant failure rate for the product being modeled.
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What is the event space method?
Answer
Correct Answer:
A method for determining the reliability of complex systems.
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What does the Duane model predict?
Answer
Correct Answer:
A reliability growth profile
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What is the definition of "Downtime"?
Answer
Correct Answer:
The amount of time during which a repairable unit is not operating.
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What are detection ratings used for?
Answer
Correct Answer:
To estimate the likelihood of prior detection for each cause of failure.
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What is the purpose of detection ratings?
Answer
Correct Answer:
To estimate the likelihood of detecting a problem before it reaches the end user or customer.
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What is DRBFM?
Answer
Correct Answer:
Design reviews based on failure mode
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What is the purpose of Design for reliability?
Answer
Correct Answer:
To ensure the product is reliable
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What is an FMEA?
Answer
Correct Answer:
A Failure Modes and Effects Analysis
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What is the main objective of a Design FMEA?
Answer
Correct Answer:
To improve the design of a subsystem or component.
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What is the purpose of degradation analysis?
Answer
Correct Answer:
To predict the point at which each unit in the sample is expected to fail.
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What is the decomposition method?
Answer
Correct Answer:
A method for determining the reliability of complex systems
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What is a cumulative distribution function?
Answer
Correct Answer:
A function obtained by integrating the failure distribution pdf.
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What is the purpose of criticality analysis?
Answer
Correct Answer:
To prioritize issues that takes into account the probability of failure for the item
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What is the name of the model used to analyze data with multiple stress types?
Answer
Correct Answer:
Cumulative damage model
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What is a Control Plan used for?
Answer
Correct Answer:
Keeping track of characteristics that affect a product during the manufacturing process
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What is a contour plot?
Answer
Correct Answer:
A graphical representation of the possible solutions to the likelihood ratio equation.
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What is a confidence bound?
Answer
Correct Answer:
A measure of the precision of a statistical estimate
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What is the probability that an item that has survived for 100 hours will survive for an additional 100 hours?
Answer
Correct Answer:
Conditional reliability
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What is a complex system?
Answer
Correct Answer:
A block diagram that cannot be reduced to series and/or parallel systems.
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What is the definition for complete data?
Answer
Correct Answer:
Data that consists of only exact failure times.
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In a competing failure mode model, what does each block represent?
Answer
Correct Answer:
A failure mode
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What is the definition of censored data?
Answer
Correct Answer:
Data in which not all of the data points represent exact failure times.
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What is the name for data in which not all of the data points represent exact failure times?
Answer
Correct Answer:
Censored data
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What is a block diagram?
Answer
Correct Answer:
A diagram that represents how the components, represented by "blocks," are arranged and related reliability-wise in a larger system.
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What is B10 life?
Answer
Correct Answer:
The time at which 10% of the population will have failed
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What is BX% life?
Answer
Correct Answer:
The time at which X% of the units in a population will have failed
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What is the Arrhenius model?
Answer
Correct Answer:
An accelerated life testing model used in accelerated life testing to establish a relationship between absolute temperature and reliability.
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Which of the following is not a part of an analysis plan?
Answer
Correct Answer:
Estimated completion dates
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What does ANOVA stand for?
Answer
Correct Answer:
Analysis of Variance
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What does "AMSAA" stand for?
Answer
Correct Answer:
Army Material Systems Analysis Activity
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What does "AMPM" stand for?
Answer
Correct Answer:
AMSAA maturity prediction model
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What is the acceleration factor?
Answer
Correct Answer:
The ratio of the product’s life at the use stress level to its life at an accelerated stress level.
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What is the main purpose of accelerated life testing?
Answer
Correct Answer:
To obtain reliability information about a product in a shorter time.
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What is the meaning of extrapolates in the definition?
Answer
Correct Answer:
To infer (an unknown) from something that is known
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