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PE Mechanical Engineering Machine Design And Materials Exam With Correct Questions And Answers 2024
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PE Mechanical Engineering Machine Design And Materials Exam With Correct Questions And Answers 2024

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  • September 23, 2024
  • 31
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • thermal strain
  • pe mechanical engineering machine design
  • specific heat or heat capacity
  • elements of machine design methodologies

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  • PE Mechanical Engineering Machine
  • PE Mechanical Engineering Machine

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PE Mechanical Engineering Machine
Design And Materials Exam With Correct
Questions And Answers 2024


Thermal .Strain .- .correct .answer.Change .in .dimensions .due .to .a .change .in .temperature

Specific .heat .(or .heat .capacity) .- .correct .answer.The .amount .of .heat .required .to .raise .the
.temperature .of .a .material .or .an .amount .of .material .by .1 .degree.




Elements .of .Machine .Design .Methodologies .- .correct .answer.1. .Identifying .Requirements
2. .Risk .assessment
3. .Verification .and .validation

Examples .of .Requirements .(for .machine .design) .- .correct .answer.Functional
.performance

Limites .on .size
User .interfaces
External .interfaces
Production .volume
Costs
Available .materials
Available .porduction .technologies
Foreseeable .usage .conditions
Foreseeable .environmental .conditions
Foreseeable .misuse
Required .safety .factors
Life .cycle .duration
product .retirement

Risk .Assessment .Methodologies .- .correct .answer.Hierarchy .of .controls .for .addressing
.hazards

Fault .Tree .Analysis .(FTA)
Failure .Modes .and .Effects .Analysis .(FMEA)

Hierarchy .of .Controls .for .Addressing .Hazards .- .correct .answer.1. .Eliminate .or .substitute:
.design .to .avoid .hazard, .or .redesign .to .eliminate .hazard

,2. .Engineering .controls: .Limit .access .to .the .hazard .through .guards .and .barriers
3. .Administrative .controls: .Attempt .to .alert .personnel .to .the .presence .of .hazard .through
.alarms, .warnings, .labels, .instructions, .work .practices, .training

4. .Personal .protective .equipment .(PPI): .personnel .must .utilize .protective .gear .because
.exposure .to .the .hazard .cannot .be .reliably .avoided




Fault .Tree .Analysis .(FTA) .- .correct .answer.A .top-down, .logic-based .methodology .for
.analyzing .a .system .failure .condition .and .determining .the .contributing .lower-level .events.

.Steps .include:

.i. .Identify .the .system .failure .condition .of .interest.

.ii. .Identify .faults .that .could .lead .to .the .system .failure .condition.

.iii. .Identify .all .known .causes .that .could .lead .to .the .identified .faults.

.iv. .Connect .causes, .and .link .faults .to .causes, .through .Boolean .logic .gates .AND .and .OR.

.v. .Group .common .fault .causes .and .refine .logical .connections.

.vi. .Identify .countermeasures .to .address .fault .causes.




Failure .Modes .and .Effects .Analysis .(FMEA) .- .correct .answer.A .risk .analysis .methodology
.to .evaluate .product/system .components .(or .functions) .for .the .following:

.i. .Potential .failure .modes

.ii. .Effects .of .the .failure

.iii. .Severity .of .the .failure .effects

.iv. .Cause(s) .of .the .failure

.v. .Likelihood .that .a .specific .cause .will .occur

.vi. .Likelihood .that .design .controls .(such .as .validation/verification) .will .prevent .the

.occurrence .(or .reduce .the .rate .of .occurrence) .of .the .cause/failure, .or .detect .the

.cause/failure .before .the .product/system .is .released .to .the .customer




Verification .- .correct .answer.Analysis .of .whether .a .product/system .complies .with .codes,
.regulations, .standards, .specifications, .or .imposed .conditions:

.i. .Testing .to .requirements .in .codes, .regulations, .and .standards

.ii. .Evaluation .of .whether .product/system .was .installed .in .accordance .with .controlling

.documents .pertaining .to .the .design, .installation, .operation, .and .performance .of .the

.product/system




Validation .- .correct .answer.Analysis .of .whether .a .product/system .meets .the .expectations
.of .customers, .end .users, .or .external .entities

.i. .Usability .studies

.ii. .Prototyping

.iii. .Evaluation .of .whether .specifications .are .sufficient .to .create .a .product/system .that

.meets .customer .expectations




Close .Sliding .Fits .- .correct .answer.RC1, .Running .Clearance .Fit
Intended .for .the .accurate .location .of .parts .that .must .assemble .without .perceptible .play

Sliding .Fits .- .correct .answer.RC2, .Running .Clearance .Fit
Intended .for .accurate .location, .but .with .greater .maximum .clearance .than .RC1.

,Parts .made .to .this .fit .move .and .turn .easily .but .are .not .intended .to .run .freely, .and .in .the
.larger .sizes .may .seize .with .small .temperature .changes.




Precision .Running .Fits .- .correct .answer.RC3, .Running .Clearance .Fit
Precision .running .fits .are .about .the .closest .fits .that .can .be .expected .to .run .freely, .and .are
.intended .for .precision .work .at .slow .speeds .and .light .journal .pressures, .but .are .not

.suitable .where .appreciable .temperature .differences .are .likely .to .be .encountered.




Close .Running .Fits .- .correct .answer.RC4, .Running .Clearance .Fit
Close .running .fits .are .intended .chiefly .for .running .fits .on .accurate .machinery .with
.moderate .surface .speeds .and .journal .pressures, .where .accurate .location .and .minimum

.play .are .desired.




Medium .Running .Fits .- .correct .answer.RC5, .RC6, .Running .Clearance .Fit
Medium .running .fits .are .intended .for .higher .running .speeds, .or .heavy .journal .pressures,
.or .both.




Free .Running .Fits .- .correct .answer.RC7, .Running .Clearance .Fit
Free .running .fits .are .intended .for .use .where .accuracy .is .not .essential, .or .where .large
.temperature .variations .are .likely .to .be .encountered, .or .under .both .these .conditions.




Loose .Running .fits .- .correct .answer.RC8, .RC9, .Running .Clearance .Fit
Loose .running .fits .are .intended .for .use .where .wide .commercial .tolerances .may .be
.necessary, .together .with .an .allowance, .on .the .external .member.




Light .Drive .Fits .- .correct .answer.FN1, .Force .or .Shrink .Fit
Light .drive .fits .are .those .requiring .light .assembly .pressures, .and .produce .more .or .less
.permanent .assemblies.




Medium .Drive .Fits .- .correct .answer.FN2, .Force .or .Shrink .Fit
Medium .drive .fits .are .suitable .for .ordinary .steel .parts, .or .for .shrink .fits .on .light .sections.

Heavy .Drive .Fits .- .correct .answer.FN13 .Force .or .Shrink .Fit
Heavy .drive .fits .are .suitable .for .heavier .steel .parts, .or .for .shrink .fits .in .medium .sections.

Force .Fits .- .correct .answer.FN4, .FN5, .Force .or .Shrink .Fit
Force .fits .are .suitable .for .parts .that .can .be .highly .stressed, .or .for .shrink .fits .where .the
.heavy .pressing .forces .required .are .impractical




Locational .Clearance .Fits .- .correct .answer.LC, .Locational .Fit
Locational .clearance .fits .are .intended .for .parts .which .are .normally .stationary, .but .that .can
.be .freely .assembled .or .disassembled.




Locational .Transition .Fits .- .correct .answer.LT, .Locational .Fit

, Locational .transition .fits .are .a .compromise .between .clearance .and .interference .fits, .for
.applications .where .accuracy .of .location .is .important, .but .either .a .small .amount .of

.clearance .or .interference .is .permissible.




Locational .Interference .Fits .- .correct .answer.LN, .Locational .Fit
Locational .interference .fits .are .used .where .accuracy .of .location .is .of .prime .importance,
.and .for .parts .requiring .rigidity .and .alignment .with .no .special .requirements .for .bore

.pressure.




Arithmetic .Mean .- .correct .answer.f .X1, .X2...Xn .represents .the .values .of .a .random .sample
.of .n .items, .the .mean .of .these .items .(Xbar) .is .the .sum .of .the .items .divided .by .the .number

.of .items




Weighted .Arithmetic .Mean .- .correct .answer.Xbar_w .= .sum(weight_i .* .Xi) ./ .sum(weight_i)

Variance .- .correct .answer.The .variance .of .the .population .is .the .arithmetic .mean .of .the
.squared .deviations .from .the .population .mean




Standard .Deviation .- .correct .answer.Square .root .of .the .population .variance

Sample .Variance .- .correct .answer.The .sum .of .the .squared .deviations .from .the .sample
.mean .divided .by .n-1




Sample .Standard .Deviation .- .correct .answer.Square .root .of .the .sample .variance

Median .- .correct .answer.The ."middle" .value .of .the .sample
When .the .discrete .data .is .rearranged .in .increasing .order .AND .n .is .odd, .the .median .is .the
.value .of .the .(n+1)/2 .items

When .n .is .even, .the .median .is .the .average .of .the .(n/2) .and .(n/2 .+ .1) .items

Mode .- .correct .answer.The .value .that .occurs .most .frequently .in .a .given .data .set.

Sample .range .(R) .- .correct .answer.The .largest .sample .value .minus .the .smallest .sample
.value




Confidence .Level .- .correct .answer.The .probability .that .the .value .of .the .parameter .falls
.within .a .specified .range .of .values




Uncertainty .- .correct .answer.Let .wR .be .the .uncertainty .in .the .result .and .w1,w2...wn .be
.the .uncertainties .in .the .independent .variables.

The .uncertainty .of .the .equation .is .the .square .root .of .the .sum .of .the .squares .of .each
.uncertainty .multiplied .by .the .derivate .of .the .equation .with .respect .to .the .variable

.assoicated .with .the .uncertainty.




Tests .for .out .of .control .(for .3-sigma .control .limits) .- .correct .answer.1. .A .single .point .falls
.outside .the .control .limits.

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