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Reliability Engineering MCQ

The Weibull distribution can be used to model what type of data?

Time

Sample size

Continuous data

Sampled data

Distinct subpopulations

Answer

Correct Answer: Distinct subpopulations

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The failure characteristics of a product may be represented by which type of distribution?

Mixed Weibull distribution

Poisson distribution

Pareto distribution

Normal distribution

Answer

Correct Answer: Mixed Weibull distribution

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What is the best estimate of unreliability based on?

A solution of the binomial equation

The degree of freedom

A statistical test

The standard deviation

A decision tree

Answer

Correct Answer: A solution of the binomial equation

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What is the term for the expected value of failure times for a failure distribution?

Mean Life

Mean Time to Failure

Standard Deviation

Cumulative Frequency

Probability

Answer

Correct Answer: Mean Life

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What is the general name of a method of parameter estimation?

Maximum likelihood estimation with bias correction

Bayesian inference

Nonparametric estimation

Maximum likelihood estimation

Answer

Correct Answer: Maximum likelihood estimation

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Maximum likelihood estimation involves the maximization of what?

The joint density function

A probability distribution

The variance equation

The likelihood equation

A statistic

Answer

Correct Answer: The likelihood equation

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Maintenance tasks are intended to repair or maintain what?

A product

A system

The user interface

Equipment

Answer

Correct Answer: A system

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What is the probability that a failed unit will be repaired within a given amount of time?

It is a measure of how reliable a process or system is

The number of defects that occur within a unit during its production life

The term is also used to denote the discipline of studying and improving the maintainability of products

It depends on the severity of the failure

Answer

Correct Answer: The term is also used to denote the discipline of studying and improving the maintainability of products

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What type of distribution is often used to model products that have physical fatigue as their prominent contributor?

Poisson distribution

Lognormal distribution

Uniform distribution

Gaussian distribution

Normal distribution

Answer

Correct Answer: Lognormal distribution

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A lognormal distribution is often used to model what products?

Products with a long life expectancy

Cancer treatments

Electronic components

Products that experience high variation in usage

Products in which physical fatigue is the prominent contributor to the primary failure mode

Answer

Correct Answer: Products in which physical fatigue is the prominent contributor to the primary failure mode

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What type of growth model does Lloyd-Lipow use?

Fixed Threats

Growth

Scaling

Reliability

Performance

Answer

Correct Answer: Reliability

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What type of model is the Lloyd-Lipow model?

Reliability growth model

Capacity growth model

Output growth model

Life cycle model

Answer

Correct Answer: Reliability growth model

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What is the ratio of a likelihood function for an unknown parameter vector compared to the likelihood function calculated at the estimated parameter vector?

Probability

Likelihood ratio squared

Likelihood ratio

Information

Likelihood ratio cubed

Answer

Correct Answer: Likelihood ratio

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What is the name of a technique that maximizes the likelihood function?

Bayesian inference

Maximum a posteriori estimation

Maximum likelihood estimation

Answer

Correct Answer: Maximum likelihood estimation

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What kind of data can also be present in a data set?

Samples that are not representative

Suspended or censored

Outlier data

Sampled data

Random data

Answer

Correct Answer: Suspended or censored

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The Arrhenius model is used to describe a product's relationship with what?

Temperature relationship

Pressure-stress relationship

Life-stress relationship

Pressure relationship

Temperature-stress relationship

Answer

Correct Answer: Life-stress relationship

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What does the term "life-stress relationship" describe?

A relationship that describes how stress levels affect the quality of a product

A relationship that describes how stress levels affect the reliability of a product

A relationship in which one partner consistently puts more stress on the other

A relationship that describes how stress levels affect the performance of a product

A relationship between a customer and a salesperson where the customer is always unhappy

Answer

Correct Answer: A relationship that describes how stress levels affect the reliability of a product

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What is used to mathematically model the reliability and failure characteristics of a product?

The failure rate

Failure data only

The reliability function

Usage data only

Failure and usage data

Answer

Correct Answer: Failure and usage data

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What kind of data did Toyota use in the creation of the statistical models to calculate product reliability?

Failure and usage

Failure and mileage

Usage and mode of operation

Market share and age

Failure and mode of operation

Answer

Correct Answer: Failure and usage

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What is the scientific name for the process of analyzing failure and usage data?

Failure analysis

Life data analysis

Usage data analysis

Answer

Correct Answer: Life data analysis

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When might a failure be left censored in data?

A data set with less than 10 valid results

500 hours of operation

30 days of operation

A failure that is not corrected

A data set that is not completely accurate

Answer

Correct Answer: 500 hours of operation

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What is the term for data that is only known to have failed before a specific time?

Bad data

Out of range data

Left censored data

Failed data

Unused data

Answer

Correct Answer: Left censored data

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What are the results of the Kaplan-Meier estimator used for?

Determining the time to first failure of a material

Reliability estimates for nonparametric data analysis

Estimating survival curves

Estimating the relative survival of groups

Estimates of the rate and probability of events

Answer

Correct Answer: Reliability estimates for nonparametric data analysis

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The median ranks method is used for calculating the what?

The number of observations

Estimates of the unreliability

Frequency of data occurrence

Measures of central tendency

The amount of data

Answer

Correct Answer: Estimates of the unreliability

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What is used to determine reliability estimates for nonparametric data analysis?

Bootstrap

Cumulative frequency

Correlation coefficient

Resampling

Kaplan-Meier estimator

Answer

Correct Answer: Kaplan-Meier estimator

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What does an inverse power law model look like when the stress is non-thermal?

Oversized parts model

Reduced life testing model

No change in life testing model

Accelerated life testing model

Oversimplified design model

Answer

Correct Answer: Accelerated life testing model

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What type of data could possibly be Interval censored?

Data that represents a range of time

Data that represents a range of prices

Data that represents a range of numeric values

Data that has missing values

Data that is not measured continuously

Answer

Correct Answer: Data that represents a range of time

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What does interval censored data represent?

A data collection method

A numerical value

A category of data

A measure of variability

A range of time

Answer

Correct Answer: A range of time

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What does the importance measure of a component equal?

The reliability of the component

The variance of the component

The first partial derivative of the component reliability with respect to the system reliability

The mean square error of the component

The mean time between failures for the component

Answer

Correct Answer: The first partial derivative of the component reliability with respect to the system reliability

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How does the importance measure of a component compare to the first partial derivative of the component's reliability with respect to the system reliability?

Higher

Lower

Equivalent

Less important

More important

Answer

Correct Answer: Equivalent

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What does HASS testing do during production?

Detect if a product has been recalled

Check the quality of an item before it is shipped

Prevent the shipment of defective items

Check to see if the item has expired

Detect when an item has been damage

Answer

Correct Answer: Prevent the shipment of defective items

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What does the acronym HASS stand for?

Highly accelerated secure storage

Health and safety screening

Highly accelerated stress screening

Health and Safety at Schools

Head, Arms, Shoulders, Spine

Answer

Correct Answer: Highly accelerated stress screening

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What is an abbreviation for Highly accelerated life testing?

HALT-X

HALT-2

HALT II

HALT III

HALT

Answer

Correct Answer: HALT

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What does HALT testing reveal?

When a product should be serviced

The effectiveness of the product

Probable failure modes for the product

The need for further design or testing

Probable causes of malfunctions

Answer

Correct Answer: Probable failure modes for the product

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Gompertz model produces an S-shaped curve for what value?

Efficiency

Reliability

Mortality

Morbidity

Answer

Correct Answer: Reliability

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Gompertz model produces an S-curve that models what?

How much effort is needed to maintain a project

Costs incurred during different stages of development

How long it will take for a project to complete

Reliability values at different stages of development

Rates of change for costs and reliability

Answer

Correct Answer: Reliability values at different stages of development

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Gompertz model produces what shape for reliability growth?

T-shaped

V-shaped

S-shaped

U-shaped

Answer

Correct Answer: S-shaped

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The generalized gamma distribution can mimic the attributes of what other distribution?

Normal

T-distribution

Weibull or lognormal

Answer

Correct Answer: Weibull or lognormal

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What is not as frequently used for modeling life data as other life distributions?

The generalized gamma distribution

The binomial distribution

The Pareto distribution

The Weibull distribution

Answer

Correct Answer: The generalized gamma distribution

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What can account for multiple non-thermal stresses?

Hydrostatic pressure

Thermal expansion

A product that has a high variation in physical characteristics

A process with unstable inputs

An accelerated life testing model

Answer

Correct Answer: An accelerated life testing model

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What is an example of a model that can't be accounted for by an accelerated life testing model?

A model with a nonlinear response

Radiological exposures

Thermal stresses

A model with an unknown structure

Mechanical stresses

Answer

Correct Answer: Thermal stresses

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What technique does MLE use?

Data-driven methods

Bayesian inference

Maximum likelihood estimation

Nonlinear regression

Answer

Correct Answer: Maximum likelihood estimation

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What is a function that describes the number of failures that can be expected to take place over a given unit of time?

Failure rate

Probability

Rate of occurrence

Probability of failure

Chance of failure

Answer

Correct Answer: Failure rate

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What does FMECA include besides a FMEA?

Criticality analysis

Hazard analysis

Establishing risks

Determining cause and effect

Cause and effect diagram

Answer

Correct Answer: Criticality analysis

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FMECA is similar to what other methodology?

PEST

DMA

Gantt chart

FMEA

PSM

Answer

Correct Answer: FMEA

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FMRA is the starting point for what?

Reliability/availability analyses and cost calculations

Frequency planning

Regulatory environment analysis

Technical support

Regulatory approvals

Answer

Correct Answer: Reliability/availability analyses and cost calculations

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FMRA starts with information from what?

Sustainability reports

Sales forecasts

What is the purpose of failure mode and effects analysis?

To figure out how to prevent failure

To determine the effects of failure on a product or process

To identify potential failure modes for a product or process

To identify corrective actions that should be taken in the event of a failure mode

To determine the effects of a possible failure mode on product or process performance

Answer

Correct Answer: To identify potential failure modes for a product or process

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What is the name of the FMEA methodology?

Pre-failure review

Fault tree analysis

Failure mode and criticality analysis

Failure mode and effects analysis

Answer

Correct Answer: Failure mode and effects analysis

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What type of failure is FEC?

Functional

Physical

Communication

Logic

Hardware

Answer

Correct Answer: Functional

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What is a process that analyzes the effects of system failures?

Failure Modes and Effects Analysis

Root Cause Analysis

Failure effect categorization

Fault localization

Answer

Correct Answer: Failure effect categorization

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The pdf is integrated to obtain the probability that a what?

Voltage

Failure time

Random variable

Frequency

Sample space

Answer

Correct Answer: Failure time

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What is the name of the An accelerated life testing model based on quantum mechanics that is typically used when temperature or humidity is the accelerated stress?

Shepp-Logan Accelerated Life Test

Eyring model

Mount Rushmore model

Eshelby model

Ramsauer mode

Answer

Correct Answer: Eyring model

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What does the 'exponential distribution' assume for the product being modeled?

A Poisson distribution

A constant failure rate

A uniform distribution

A Bernoulli distribution

Answer

Correct Answer: A constant failure rate

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The event space method is used to determine what?

The ability of a system to produce stable output

The distribution of weather patterns

The organization of knowledge within a system

The spatial distribution of a population

The reliability of complex systems

Answer

Correct Answer: The reliability of complex systems

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What is the probability of the union of all mutually exclusive events that yield a system failure?

Frequencies

Unreliability

Probability

Answer

Correct Answer: Unreliability

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What type of model does the Duane model use?

Reliability growth model

Time-series model

Cumulative model

Cumulative distribution function

Life-cycle model

Umulative test time and number of questions

Answer

Correct Answer: Reliability growth model

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The AMSAA model uses a relationship between what two values?

Cumulative test time and cumulative pass rate

Cumulative test time and cumulative failures

Cumulative test time and average grade

Cumulative test time and percentage of students achieving a standard

Answer

Correct Answer: Cumulative test time and cumulative failures

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What is the amount of time a repairable unit is not operating?

Hours

Failures

Minutes

Downtime

Outages

Answer

Correct Answer: Downtime

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What do detection ratings attempt to estimate?

The probability of a given cause of failure leading to a detection rating

The likelihood of prior detection for each cause of failure

The likelihood of detecting a failure for each cause

The number of failures that will be detected for each type of cause

The number of potential causes of failure

Answer

Correct Answer: The likelihood of prior detection for each cause of failure

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What type of ratings are used to estimate the likelihood of prior detection?

Qualitative

Quantitative

Probabilistic

Neither

Answer

Correct Answer: Qualitative

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What methodology uses a worksheet similar to the FMEA worksheet?

DRBFM

ABCD

PERT

Answer

Correct Answer: DRBFM

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What sort of process is DFR?

A process in which a product is subjected to multiple rounds of reliability testing

A process that uses computer simulation to study the reliability of products

A process in which a product is reprocessed to improve its reliability

A process in which duplicate products are produced to establish a baseline for comparison

A process in which a set of reliability engineering practices are utilized early in a product's design

Answer

Correct Answer: A process in which a set of reliability engineering practices are utilized early in a product's design

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What is the name of a process that involves incorporating reliability engineering practices into the design process?

Design assurance

Design for reliability

Failure analysis

Reliability engineering

Answer

Correct Answer: Design for reliability

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What is the objective of an FMEA performed on a subsystem or component?

Improving the design

Determining the cause of failures

Detecting potential failures

Determining the impact of failures

Testing the component

Answer

Correct Answer: Improving the design

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An FMEA performed with the objective of improving the design of a component or subsystem is known as what?

Failure FMEA

Failure Mode and Effects Analysis

Fault Mode and Effect Analysis

Fault FMEA

Design FMEA

Answer

Correct Answer: Design FMEA

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A product that has high reliability, it is not possible to test each unit to failure under what conditions?

High risk conditions

Failed conditions

Extreme conditions

Normal conditions

Answer

Correct Answer: Normal conditions

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What is a technique that uses the performance measurements of a product to predict the point at which each unit in the sample will fail?

Statistical process control

Failure analysis

Failure mode and effects analysis

Degradation analysis

Pareto charting

Answer

Correct Answer: Degradation analysis

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What is the law of total probability used for?

Determining sample size

Determining the chance of success

Decomposition method

Determining how likely something is

Determining the probability of an event

Answer

Correct Answer: Decomposition method

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A function obtained by what?

Normalizing the input data

Taking the derivative of the failure distribution pdf

Integrating the failure distribution pdf

Exponential weighting

Computing the cumulative hazard function

Answer

Correct Answer: Integrating the failure distribution pdf

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How is the resulting prioritization used to determine corrective actions?

To prioritize corrective actions

To determine the corrective actions to take

To determine the sequence and time-frame

To communicate corrective actions to the affected stakeholders

Answer

Correct Answer: To determine the sequence and time-frame

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What type of analysis looks at probability of failure?

Cause and effect analysis

Probability analysis

Criticality analysis

Failure mode and effects analysis

Failure analysis

Answer

Correct Answer: Criticality analysis

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What does the ALC model stand for?

Accelerated life testing model

Advanced life support model

Accelerated life cycle model

Advanced locomotive control model

Advanced life support protocol

Answer

Correct Answer: Accelerated life testing model

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What is the model used to analyze data with multiple stress types and/or situations where the stress varies with time?

Response surface model

Catastrophe model

Job stress model

Time-variant response model

Cumulative damage model

Answer

Correct Answer: Cumulative damage model

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What is the plan used to keep track of characteristics that affect a product during the manufacturing process?

Process plan

Material flow plan

Control plan

Sequence plan

Answer

Correct Answer: Control plan

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How is the contour plot used to make comparisons between two different data sets?

To determine the trend of data

To identify outliers

To determine confidence bounds

To compare shapes

Answer

Correct Answer: To determine confidence bounds

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What does the term "contour plot" refer to?

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

A visualization technique used to depict data with varying frequency

A graphical representation of the data points within a given sample

A graphical representation of the results of a Chi-square test

A graphical representation of the variation in a population

Answer

Correct Answer: A graphical representation of the possible solutions to the likelihood ratio equation

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How many reliability tests are performed on the product?

Five

Ten

Nine

None

Eight

Answer

Correct Answer: Ten

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What is a measure of the precision of a statistical estimate referred to as?

Confidence bounds

Margin of error

Standard error

Mean

Answer

Correct Answer: Confidence bounds

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When a product has successfully operated for a certain amount of time, what is the probability that it will operate successfully for the next specified amount of time?

Conditional reliability

Sample size

Conjugate reliability

Time to failure

Predictive validity

Answer

Correct Answer: Conditional reliability

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How many hours has an item been successfully operating?

600

300

100

500

1000

Answer

Correct Answer: 100

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What can be reduced to a series and/or parallel system but is not a complex system?

Chemical equation

Thermodynamic model

Block diagram

Circuit

Flowchart

Answer

Correct Answer: Block diagram

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A block diagram that cannot be reduced to series and/or parallel systems is called what?

System with delays

Complex system

Serial system

System with feedback

Parallel system

Answer

Correct Answer: Complex system

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What does the "end of data" refer to?

The end of a project

The completion of a set of data

Exact failure times

Answer

Correct Answer: Exact failure times

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What does "complete data" mean?

Data that consists of only exact failure times

Data that has been collected in a timely manner

Data that is completely accurate

Answer

Correct Answer: Data that consists of only exact failure times

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What is represented as a series reliability system?

A system that will indicate when items are no longer needed

A system that tests items to determine how often they produce correct results

Items that fail due to more than one failure mode

Items that have a fixed number of failures

A system that will indicate when items have failed

Answer

Correct Answer: Items that fail due to more than one failure mode

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The failure modes are considered to be what to each other to see which one will cause the item to fail?

Competing

Temperature

Manufacturing

Load

Power

Answer

Correct Answer: Competing

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What do all censoring schemes have in common?

They are all susceptible to error

They all have some level of inaccuracy

Not all of the data points represent exact failure times

They all reduce freedom of expression

They all rely on human interpretation

Answer

Correct Answer: Not all of the data points represent exact failure times

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What is another name for right-censoring?

Political correctness

Left-censoring

The right-hemisphere bias

Liberal bias

The left-hemisphere bias

Answer

Correct Answer: Left-censoring

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A diagram that represents how the components, represented by "blocks," are arranged and related reliability-wise in a larger system is referred to as what?

A system diagram

A reliability block diagram or RBD

A functional block diagram

A wiring diagram

A block diagram

Answer

Correct Answer: A reliability block diagram or RBD

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What percentage of the population will have failed the item by 100 hours of operation?

50%

30%

10%

20%

25%

Answer

Correct Answer: 10%

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What is the ability of an item to function when needed?

The probability that an item will be able to function

The quality of an item that will make it able to function

The ability of an item to resist damage

The reliability of an item that will make it able to function

Answer

Correct Answer: The probability that an item will be able to function

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What does "maintainability" mean?

How easy it is to use

How quickly it can be repaired

How easy it is to modify

How often it needs to be repaired

How much work it requires

Answer

Correct Answer: How quickly it can be repaired

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What is the name of the model originally used to establish a relationship between temperature and reliability?

Arrhenius model

Carnot model

Ideal gas model

Kelvin model

Carnot heat engine model

Answer

Correct Answer: Arrhenius model

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Who developed the Arrhenius model?

Johannes Michael Faraday

Svante Arrhenius

James Clerk Maxwell

J.J. Thomson

Jakob von Uexküll

Answer

Correct Answer: Svante Arrhenius

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What do people use to keep track of projects?

Timeline

Project schedule

Analysis plan

Task list

Answer

Correct Answer: Analysis plan

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What did Dogecoin rally by after Musk's tweets?

About 100 percent

About 20 percent

About 80 percent

Answer

Correct Answer: About 20 percent

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His statement prompted a downward spiral for what value?

A greater sense of community

Bitcoin

Liberty

Morality

Democracy

Answer

Correct Answer: Bitcoin

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What is ANOVA used for?

Testing the difference between two means

Determining whether there is a difference in means

Constructing a multiple regression model

Analysis of variance

Testing the difference between more than two means

Answer

Correct Answer: Analysis of variance

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What stands for analysis of variance?

T-test

ANOVA

Attribution error

SEM

The t-test

Answer

Correct Answer: ANOVA

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What does the acronym AMSA stand for?

American Mosaic Society

Army Material Systems Analysis Activity

Association of Military Service Academies

American Metal Scrap Association

American Motorcyclist Association

Answer

Correct Answer: Army Material Systems Analysis Activity

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What does AMPM stand for?

American Motors Corporation

American Motor Speed Association

AMSAA maturity prediction model

American Multi-Service Assurance Association

Annual Member Meeting of Members

Answer

Correct Answer: AMSAA maturity prediction model

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Where does accelerated life testing come from?

Genetic engineering

Nano machines

A.D.D. testing

Life data

Genetics

Answer

Correct Answer: Life data

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What term refers to testing at higher than normal stress levels?

Accelerated life testing

Extreme life testing

Extraordinary life testing

Maximum life testing

Answer

Correct Answer: Accelerated life testing

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Mechatronics

Microprocessor

Neural Networks

Product Design and Development

Robotics

Rocket Propulsion

Smart Materials

Space Mechanics

Stress Analysis

Theory of Vibrations

Thermodynamics

Total Quality Management

More Resources

Aerospace & Aeronautical Engineering Skill Assessment

Aerospace & Aeronautical Engineering PDF

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