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Reliability and Failure Analysis MCQs

**Correct Answer:
The analysis of the change in reliability over time **

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A structured framework for analyzing the functions and potential failure modes for a physical asset **

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Reliability **

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Failure **

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The non-quantifiable point-level excellence of a product or process **

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A model that can account for multiple non-thermal stresses as acceleration factors **

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It records the product and process characteristics that are important to keep under control. **

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A high level chart **

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Plotting failure time vs. unreliability **

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The plotted points fall on a relatively straight line **

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Probability density function **

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Close to 0 **

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The system has not failed. **

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Qualitative ratings used to estimate the likelihood of occurrence for each cause of failure. **

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To estimate the likelihood of occurrence for each cause of failure **

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C. F. Gauss **

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It avoids potentially large errors brought about by making incorrect assumptions about the distribution. **

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Wider **

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Non-homogeneous Poisson process **

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Constant failure recurrence rate **

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Mean time to repair **

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"mean time to failure" **

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Mean time between failures **

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A method of generating values from a known distribution for the purposes of experimentation. **

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Modified Gompertz model **

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The probability that the item's failure will be due to the failure mode under consideration. **

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Mode Ratio **

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To model data with distinct subpopulations that may represent different failure characteristics over the lifetime of a product. **

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50% **

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Average Life **

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Mean life **

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The parameter values that maximize the value of the likelihood equation for a particular data set. **

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Activities intended to repair or maintain a system **

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The probability that a failed unit will be repaired within a given amount of time. **

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Physical fatigue **

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A reliability growth model based on the number of trials and successes at each stage of product development. **

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Likelihood ratio **

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Maximize the likelihood function to determine the best parameter estimates. **

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Life-stress relationship **

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To mathematically model the reliability and failure characteristics of a product. **

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A type of interval censored data where the failure is only known to have occurred before a specific time. **

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An estimator used to calculate the estimates of the unreliability for probability plotting purposes. **

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To calculate the estimates of the unreliability for probability plotting purposes **

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A model commonly used when the accelerating factor is a single, non-thermal stress. **

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Data that represents a range of time within which the unit is known to have failed **

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A measure of the relative contribution of a component’s contribution to the overall system’s reliability. **

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Highly accelerated stress screening **

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Highly accelerated life testing **

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S-shaped reliability growth curve **

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To mimic the attributes of other distributions **

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The ability to mimic the attributes of other distributions **

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A model that can account for multiple non-thermal stresses as acceleration factors **

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**Correct Answer:
Select a life-stress relationship for each stress **

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The variability of estimated parameter values **

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To determine confidence bounds when using maximum likelihood estimation (MLE) techniques. **

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Failures per unit time among surviving units **

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Failure modes, effects and criticality analysis **

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Criticality analysis **

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Failure modes and effects analysis **

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**Correct Answer:
Failure modes and reliability analysis **

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Failure mode and effects analysis **

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Failure effect categorization **

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Failure distribution **

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A mathematical model that describes the probability of failures occurring over time. **

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An accelerated life testing model based on quantum mechanics **

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A lifetime statistical distribution that assumes a constant failure rate for the product being modeled. **

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A constant failure rate for the product being modeled. **

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A method for determining the reliability of complex systems. **

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A reliability growth profile **

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The amount of time during which a repairable unit is not operating. **

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To estimate the likelihood of prior detection for each cause of failure. **

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To estimate the likelihood of detecting a problem before it reaches the end user or customer. **

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Design reviews based on failure mode **

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To ensure the product is reliable **

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A Failure Modes and Effects Analysis **

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To improve the design of a subsystem or component. **

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To predict the point at which each unit in the sample is expected to fail. **

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A method for determining the reliability of complex systems **

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A function obtained by integrating the failure distribution pdf. **

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To prioritize issues that takes into account the probability of failure for the item **

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Cumulative damage model **

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Keeping track of characteristics that affect a product during the manufacturing process **

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A graphical representation of the possible solutions to the likelihood ratio equation. **

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A measure of the precision of a statistical estimate **

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Conditional reliability **

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A block diagram that cannot be reduced to series and/or parallel systems. **

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Data that consists of only exact failure times. **

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A failure mode **

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Data in which not all of the data points represent exact failure times. **

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Censored data **

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A diagram that represents how the components, represented by "blocks," are arranged and related reliability-wise in a larger system. **

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The time at which 10% of the population will have failed **

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The time at which X% of the units in a population will have failed **

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An accelerated life testing model used in accelerated life testing to establish a relationship between absolute temperature and reliability. **

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**Correct Answer:
Estimated completion dates **

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**Correct Answer:
Analysis of Variance **

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Army Material Systems Analysis Activity **

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AMSAA maturity prediction model **

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The ratio of the product’s life at the use stress level to its life at an accelerated stress level. **

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To obtain reliability information about a product in a shorter time. **

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**Correct Answer:
To infer (an unknown) from something that is known **

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