CHAPTER 17: MAINTENANCE AND RELIABILITY
g g g g
TRUE/FALSE
1. OrlandogUtilitiesgCommissiongusesgagcomputerizedgmaintenancegmanagementgprogram,gandg
devotesgsignificantgdollargandglaborgresourcesgtogpowergplantgmaintenance,gbecausegthegcostsg
ofgunexpectedgfailuregaregincrediblyghigh.
Trueg(Globalgcompanygprofile,geasy)g{AACSB:gUsegofgIT}
2. Maintenancegincludesgallgactivitiesginvolvedgingkeepinggagsystem'sgequipmentgingworkinggorder.
Trueg(Thegstrategicgimportancegofgmaintenancegandgreliability,geasy)
3. Reliabilitygisgthegprobabilitygthatgagmachinegpartgorgproductgwillgfunctiongproperlygforgagspecifi
edgtimegregardlessgofgconditions.
Falseg(Thegstrategicgimportancegofgmaintenancegandgreliability,geasy)
4. Thegproductgfailuregrategisgthegpercentagegofgfailuresgamonggthegtotalgnumbergofgproductsgtested.
Trueg(Reliability,gmoderate)
5. ThegMTBFg(meangtimegbetweengfailures)gisgcalculatedgasgthegreciprocalgofgthegnumbergofgfailur
esgduringgagperiodgofgtime.
Trueg(Reliability,gmoderate)
6. Ifgthegmeangtimegbetweengfailuresghasgbeengcalculatedgtogbeg2,000ghours,gthengthegnumbergofgu
nitgfailuresgperg2,000ghoursgmustgbegone.
Falseg(Reliability,gmoderate)
7. Thegreliabilitygofgagsystemgingwhichgeachgindividualgcomponentgmustgfunctiongingordergforgthegent
iregsystemgtogfunction,gandgingwhichgeachgcomponentghasgitsgownguniquegreliability,gindependentg
ofgothergcomponents,gisgthegproductgofgthegprobabilitiesgofgeachgofgthosegcomponents.
Trueg(Reliability,gmoderate)
8. Addinggangadditionalgpartgtogagcomponentgorgproductgordinarilygreducesgreliabilitygbygintroduci
nggangadditionalgsourcegofgfailure.
Trueg(Reliability,gmoderate)
9. Agredundantgpartgorgcomponentgincreasesgreliabilitygbecausegitgisgconnectedgingparallel,gnotgingseries.
Trueg(Reliability,gmoderate)
10. Agredundantgpartgdecreasesgreliabilitygifgthegreliabilitygofgthegredundantgpartgisglowergthangthatgofgt
hegpartgitgisgbackinggup.
Falseg(Reliability,gmoderate)
11. Preventivegmaintenancegisgreactive.
Falseg(Maintenance,gmoderate)
12. Preventivegmaintenancegisgnothinggmoregthangkeepinggthegequipmentgandgmachinerygrunning.
Falseg(Maintenance,gmoderate)
458
,13. Preventivegmaintenancegimpliesgthatgwegcangdeterminegwhengagsystemgneedsgservicegorgwillgne
edgrepair.
Trueg(Maintenance,gmoderate)
14. Infantgmortalitygrefersgtogtheghighgfailuregrategoftengencounteredgingthegverygearlygstagesgofgt
heglifetimegofgagproduct.
Trueg(Maintenance,gmoderate)
15. Thegfailuregdistributionsgofgproducts,gmachines,gorgprocessesgthatghaveg"settledgin,"gorggonegbeyo
ndgtheginfantgmortalitygphase,goftengfollowgthegnormalgdistribution.
Trueg(Maintenance,geasy)
16. Recordinggthegmaintenanceghistorygofgprocesses,gmachines,gorgequipmentgisgimportantgf
orgpreventivegmaintenance,gbutglargelygirrelevantgforgbreakdowngmaintenance.
Falseg(Maintenance,geasy)
17. Theg"fullgcostgviewgofgmaintenance"gresultsgingmoregfirmsgchoosinggagpolicygofgbreakdo
wngmaintenance,gwhengcomparedgtogtheg"traditionalgviewgofgmaintenance."
Falseg(Maintenance,geasy)
18. Failuresgaregtolerablegasglonggasgtheirgresultsgaregnotgcatastrophic.
Falseg(Maintenance,gmoderate)
19. SmallgstandardgdeviationsgingthegMTBFgdistributiongofgagmachinegtendgtogsupportgagpolicyg
ofgbreakdowngmaintenancegforgthatgmachine.
Falseg(Maintenance,gmoderate)
20. Whengidentifyinggthegoptimalgmaintenancegpolicy,gthegcostgofginventorygmaintainedgtogcompensa
tegforgthegdowntimegisgagcostgoftengignored.
Trueg(Maintenance,gmoderate)
21. Angoptimalgmaintenancegpolicygstrikesgagbalancegbetweengthegcostsgofgbreakdowngandgpreventi
vegmaintenancegsogthatgthegtotalgcostgofgmaintenancegisgatgagminimum.
Trueg(Maintenance,gmoderate)
22. Whilegbreakdownsgoccurgrandomly,gtheirgfrequencygisgsomewhatgpredictablegthroughgsuchgtoolsg
asgthegproductgfailuregrate,gMTBF,gandgthegbreakdowngcostsgmodel.
Trueg(Maintenance,gmoderate)
23. Thegobjectivegofgmaintenancegandgreliabilitygisgtogmaintaingthegcapabilitygofgthegsystem.
Trueg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
24. TPMg(totalgproductivegmaintenance)gisgangapplicationgofgTQMg(totalgqualitygmanagemen
t)gprinciplesgtogthegareagofgmaintenance.
Trueg(Totalgproductivegmaintenance,gmoderate)
25. Simulationgmodelsgandgexpertgsystemsgaregusefulgtoolsgforgdetermininggmaintenancegpolicies.
Trueg(Techniquesgforgenhancinggmaintenance,gmoderate)g{AACSB:gUsegofgIT}
459
,MULTIPLEgCHOICE
26. WhichgofgthegfollowinggstatementsgaboutgmaintenancegatgOrlandogUtilitiesgCommissiongisgfalse?
a. Theregaregatgleastgtwogtypesgofgpreventivegmaintenance,gincludinggangannualgmaintenancegan
dgaglessgfrequentgoverhaulgschedule.
b. Itsgpreventivegmaintenancegprogramghasgearnedgthegcompanygtopgrankingsgandgitsgcompetiti
vegadvantage.
c. Eachgpower-generatinggunitgisgtakengoff-linegeverygthreegyearsgforgagcompletegoverhaul.
d. Eachgofgitsgpower-generatinggunitsgisgtakengoff-linegforgmaintenancegeverygonegtogthreegweeks.
e. Costsgassociatedgwithgbreakdownsgaregseveralgtimesghighergthangcostsgarisinggfromgpreventi
vegmaintenance.
dg(Globalgcompanygprofile,gmoderate)
27. Thegobjectivegofgmaintenancegandgreliabilitygisgto
a. ensuregthatgbreakdownsgdognotgaffectgthegqualitygofgthegproducts
b. ensuregthatgnogbreakdownsgwillgevergoccur
c. ensuregthatgpreventivegmaintenancegcostsgaregkeptgasglowgasgpossible
d. maintaingthegcapabilitygofgthegsystem
e. ensuregthatgmaintenancegemployeesgaregfullygutilized
dg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
28. Thegprobabilitygthatgagproductgwillgfunctiongproperlygforgagspecifiedgtimegundergstatedgconditionsgis
a. functionality
b. maintenance
c. durability
d. reliability
e. fitnessgforguse
dg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
29. Whichgofgthegfollowinggbestgillustratesgthegimportancegofgemployeeginvolvementgingachievi
nggsuccessfulgmaintenancegandgreliability?
a. Operator,gmachine,gandgmechanicgaregindependentgofgoneganother.
b. Smallgstandardgdeviationsgtendgtogfavorgpreventivegmaintenancegovergbreakdowngmaintenance.
c. Infantgmortalitygingproductsgcangbegdecreasedgthroughgimprovedgowner'sgmanualsgandgafte
r-gsalesgservicegandgcustomergtraining.
d. Employeeginvolvementgthroughgsuchgelementsgasgrewardgsystemsgandgpowergsharinggcombi
negwithggoodgmaintenancegandgreliabilitygproceduresgtogimprovegcapacitygandgreducegvariab
ility.
e. Empoweredgoperatorsghaveghighergcompetencegatgrepairsgthangfieldgservicegorgdepotgservice.
dg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
30. Whatgisgthegreliabilitygofgagfour-
componentgproduct,gwithgcomponentsgingseries,gandgcomponentgreliabilitiesgofg.90,g.95,g.98,ga
ndg.99?
a. underg0.83
b. atgmostg0.90
c. 0.955
d. noglessgthang.99
e. nonegofgthegabove
ag(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
460
, 31. AgsystemgisgcomposedgofgthreegcomponentsgA,gB,gandgC.gAllgthreegmustgfunctiongforgthegsystemg
togfunction.gTheregaregcurrentlygnogbackupsgingplace.gThegsystemghasgagreliabilitygofg0.966.gIfgagb
ackupgisginstalledgforgcomponentgA,gthegnewgsystemgreliabilitygwillgbe
a. unchanged
b. lessgthang0.966
c. lessgthang0.998
d. greatergthang0.966
e. nonegofgthegabove
dg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
32. Agsystemghasgthreegcomponentsgingseriesgwithgreliabilitiesg0.9,g0.7,gandg0.5.gSystemgreliabilitygis
a. 0.315
b. 0.500
c. 0.700
d. 0.900
e. 2.100
ag(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
33. Agsystemghasgthreegcomponentsgingparallelgwithgreliabilitiesg0.9,g0.7,gandg0.5.gSystemgreliabilitygis
a. 0.315
b. 0.700
c. 0.900
d. 0.985
e. 2.100
dg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
34. ComponentsgA,gB,gandgCgaregconnectedgingseries.gComponentgDgisgconnectedgingparallel
gtogcomponentgB.gWhichgofgthegfollowinggstatementsgisgtrue?
a. ThegsystemgworksgonlygifgAgworks,gBgorgCgworks,gandgDgworks.
b. ComponentgBgmustgworkgforgthegsystemgtogwork.
c. ThegsystemgworksgwhengAgworks,gC,gworks,gandgeithergBgorgDgworks.
d. ComponentsgBgandgCgaregbackupsgtogA.
e. ThegsystemgworksgifgDgworks,gandganygofgA,gB,gorgCgworks.
cg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
35. Agjobgconsistsgofgagseriesgofgthreegtasks.gTaskg1gisgperformedgcorrectlyg98%gofgthegtime,gtaskg
2gisgperformedgcorrectlyg99%gofgthegtime,gandgtaskg3gisgperformedgcorrectlyg97%gofgthegtime.
gThegreliabilitygofgthisgjobgis
a. 91.27%
b. 94.11%
c. 97.00%
d. 98.00%
e. 99.00%
bg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
461
g g g g
TRUE/FALSE
1. OrlandogUtilitiesgCommissiongusesgagcomputerizedgmaintenancegmanagementgprogram,gandg
devotesgsignificantgdollargandglaborgresourcesgtogpowergplantgmaintenance,gbecausegthegcostsg
ofgunexpectedgfailuregaregincrediblyghigh.
Trueg(Globalgcompanygprofile,geasy)g{AACSB:gUsegofgIT}
2. Maintenancegincludesgallgactivitiesginvolvedgingkeepinggagsystem'sgequipmentgingworkinggorder.
Trueg(Thegstrategicgimportancegofgmaintenancegandgreliability,geasy)
3. Reliabilitygisgthegprobabilitygthatgagmachinegpartgorgproductgwillgfunctiongproperlygforgagspecifi
edgtimegregardlessgofgconditions.
Falseg(Thegstrategicgimportancegofgmaintenancegandgreliability,geasy)
4. Thegproductgfailuregrategisgthegpercentagegofgfailuresgamonggthegtotalgnumbergofgproductsgtested.
Trueg(Reliability,gmoderate)
5. ThegMTBFg(meangtimegbetweengfailures)gisgcalculatedgasgthegreciprocalgofgthegnumbergofgfailur
esgduringgagperiodgofgtime.
Trueg(Reliability,gmoderate)
6. Ifgthegmeangtimegbetweengfailuresghasgbeengcalculatedgtogbeg2,000ghours,gthengthegnumbergofgu
nitgfailuresgperg2,000ghoursgmustgbegone.
Falseg(Reliability,gmoderate)
7. Thegreliabilitygofgagsystemgingwhichgeachgindividualgcomponentgmustgfunctiongingordergforgthegent
iregsystemgtogfunction,gandgingwhichgeachgcomponentghasgitsgownguniquegreliability,gindependentg
ofgothergcomponents,gisgthegproductgofgthegprobabilitiesgofgeachgofgthosegcomponents.
Trueg(Reliability,gmoderate)
8. Addinggangadditionalgpartgtogagcomponentgorgproductgordinarilygreducesgreliabilitygbygintroduci
nggangadditionalgsourcegofgfailure.
Trueg(Reliability,gmoderate)
9. Agredundantgpartgorgcomponentgincreasesgreliabilitygbecausegitgisgconnectedgingparallel,gnotgingseries.
Trueg(Reliability,gmoderate)
10. Agredundantgpartgdecreasesgreliabilitygifgthegreliabilitygofgthegredundantgpartgisglowergthangthatgofgt
hegpartgitgisgbackinggup.
Falseg(Reliability,gmoderate)
11. Preventivegmaintenancegisgreactive.
Falseg(Maintenance,gmoderate)
12. Preventivegmaintenancegisgnothinggmoregthangkeepinggthegequipmentgandgmachinerygrunning.
Falseg(Maintenance,gmoderate)
458
,13. Preventivegmaintenancegimpliesgthatgwegcangdeterminegwhengagsystemgneedsgservicegorgwillgne
edgrepair.
Trueg(Maintenance,gmoderate)
14. Infantgmortalitygrefersgtogtheghighgfailuregrategoftengencounteredgingthegverygearlygstagesgofgt
heglifetimegofgagproduct.
Trueg(Maintenance,gmoderate)
15. Thegfailuregdistributionsgofgproducts,gmachines,gorgprocessesgthatghaveg"settledgin,"gorggonegbeyo
ndgtheginfantgmortalitygphase,goftengfollowgthegnormalgdistribution.
Trueg(Maintenance,geasy)
16. Recordinggthegmaintenanceghistorygofgprocesses,gmachines,gorgequipmentgisgimportantgf
orgpreventivegmaintenance,gbutglargelygirrelevantgforgbreakdowngmaintenance.
Falseg(Maintenance,geasy)
17. Theg"fullgcostgviewgofgmaintenance"gresultsgingmoregfirmsgchoosinggagpolicygofgbreakdo
wngmaintenance,gwhengcomparedgtogtheg"traditionalgviewgofgmaintenance."
Falseg(Maintenance,geasy)
18. Failuresgaregtolerablegasglonggasgtheirgresultsgaregnotgcatastrophic.
Falseg(Maintenance,gmoderate)
19. SmallgstandardgdeviationsgingthegMTBFgdistributiongofgagmachinegtendgtogsupportgagpolicyg
ofgbreakdowngmaintenancegforgthatgmachine.
Falseg(Maintenance,gmoderate)
20. Whengidentifyinggthegoptimalgmaintenancegpolicy,gthegcostgofginventorygmaintainedgtogcompensa
tegforgthegdowntimegisgagcostgoftengignored.
Trueg(Maintenance,gmoderate)
21. Angoptimalgmaintenancegpolicygstrikesgagbalancegbetweengthegcostsgofgbreakdowngandgpreventi
vegmaintenancegsogthatgthegtotalgcostgofgmaintenancegisgatgagminimum.
Trueg(Maintenance,gmoderate)
22. Whilegbreakdownsgoccurgrandomly,gtheirgfrequencygisgsomewhatgpredictablegthroughgsuchgtoolsg
asgthegproductgfailuregrate,gMTBF,gandgthegbreakdowngcostsgmodel.
Trueg(Maintenance,gmoderate)
23. Thegobjectivegofgmaintenancegandgreliabilitygisgtogmaintaingthegcapabilitygofgthegsystem.
Trueg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
24. TPMg(totalgproductivegmaintenance)gisgangapplicationgofgTQMg(totalgqualitygmanagemen
t)gprinciplesgtogthegareagofgmaintenance.
Trueg(Totalgproductivegmaintenance,gmoderate)
25. Simulationgmodelsgandgexpertgsystemsgaregusefulgtoolsgforgdetermininggmaintenancegpolicies.
Trueg(Techniquesgforgenhancinggmaintenance,gmoderate)g{AACSB:gUsegofgIT}
459
,MULTIPLEgCHOICE
26. WhichgofgthegfollowinggstatementsgaboutgmaintenancegatgOrlandogUtilitiesgCommissiongisgfalse?
a. Theregaregatgleastgtwogtypesgofgpreventivegmaintenance,gincludinggangannualgmaintenancegan
dgaglessgfrequentgoverhaulgschedule.
b. Itsgpreventivegmaintenancegprogramghasgearnedgthegcompanygtopgrankingsgandgitsgcompetiti
vegadvantage.
c. Eachgpower-generatinggunitgisgtakengoff-linegeverygthreegyearsgforgagcompletegoverhaul.
d. Eachgofgitsgpower-generatinggunitsgisgtakengoff-linegforgmaintenancegeverygonegtogthreegweeks.
e. Costsgassociatedgwithgbreakdownsgaregseveralgtimesghighergthangcostsgarisinggfromgpreventi
vegmaintenance.
dg(Globalgcompanygprofile,gmoderate)
27. Thegobjectivegofgmaintenancegandgreliabilitygisgto
a. ensuregthatgbreakdownsgdognotgaffectgthegqualitygofgthegproducts
b. ensuregthatgnogbreakdownsgwillgevergoccur
c. ensuregthatgpreventivegmaintenancegcostsgaregkeptgasglowgasgpossible
d. maintaingthegcapabilitygofgthegsystem
e. ensuregthatgmaintenancegemployeesgaregfullygutilized
dg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
28. Thegprobabilitygthatgagproductgwillgfunctiongproperlygforgagspecifiedgtimegundergstatedgconditionsgis
a. functionality
b. maintenance
c. durability
d. reliability
e. fitnessgforguse
dg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
29. Whichgofgthegfollowinggbestgillustratesgthegimportancegofgemployeeginvolvementgingachievi
nggsuccessfulgmaintenancegandgreliability?
a. Operator,gmachine,gandgmechanicgaregindependentgofgoneganother.
b. Smallgstandardgdeviationsgtendgtogfavorgpreventivegmaintenancegovergbreakdowngmaintenance.
c. Infantgmortalitygingproductsgcangbegdecreasedgthroughgimprovedgowner'sgmanualsgandgafte
r-gsalesgservicegandgcustomergtraining.
d. Employeeginvolvementgthroughgsuchgelementsgasgrewardgsystemsgandgpowergsharinggcombi
negwithggoodgmaintenancegandgreliabilitygproceduresgtogimprovegcapacitygandgreducegvariab
ility.
e. Empoweredgoperatorsghaveghighergcompetencegatgrepairsgthangfieldgservicegorgdepotgservice.
dg(Thegstrategicgimportancegofgmaintenancegandgreliability,gmoderate)
30. Whatgisgthegreliabilitygofgagfour-
componentgproduct,gwithgcomponentsgingseries,gandgcomponentgreliabilitiesgofg.90,g.95,g.98,ga
ndg.99?
a. underg0.83
b. atgmostg0.90
c. 0.955
d. noglessgthang.99
e. nonegofgthegabove
ag(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
460
, 31. AgsystemgisgcomposedgofgthreegcomponentsgA,gB,gandgC.gAllgthreegmustgfunctiongforgthegsystemg
togfunction.gTheregaregcurrentlygnogbackupsgingplace.gThegsystemghasgagreliabilitygofg0.966.gIfgagb
ackupgisginstalledgforgcomponentgA,gthegnewgsystemgreliabilitygwillgbe
a. unchanged
b. lessgthang0.966
c. lessgthang0.998
d. greatergthang0.966
e. nonegofgthegabove
dg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
32. Agsystemghasgthreegcomponentsgingseriesgwithgreliabilitiesg0.9,g0.7,gandg0.5.gSystemgreliabilitygis
a. 0.315
b. 0.500
c. 0.700
d. 0.900
e. 2.100
ag(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
33. Agsystemghasgthreegcomponentsgingparallelgwithgreliabilitiesg0.9,g0.7,gandg0.5.gSystemgreliabilitygis
a. 0.315
b. 0.700
c. 0.900
d. 0.985
e. 2.100
dg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
34. ComponentsgA,gB,gandgCgaregconnectedgingseries.gComponentgDgisgconnectedgingparallel
gtogcomponentgB.gWhichgofgthegfollowinggstatementsgisgtrue?
a. ThegsystemgworksgonlygifgAgworks,gBgorgCgworks,gandgDgworks.
b. ComponentgBgmustgworkgforgthegsystemgtogwork.
c. ThegsystemgworksgwhengAgworks,gC,gworks,gandgeithergBgorgDgworks.
d. ComponentsgBgandgCgaregbackupsgtogA.
e. ThegsystemgworksgifgDgworks,gandganygofgA,gB,gorgCgworks.
cg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
35. Agjobgconsistsgofgagseriesgofgthreegtasks.gTaskg1gisgperformedgcorrectlyg98%gofgthegtime,gtaskg
2gisgperformedgcorrectlyg99%gofgthegtime,gandgtaskg3gisgperformedgcorrectlyg97%gofgthegtime.
gThegreliabilitygofgthisgjobgis
a. 91.27%
b. 94.11%
c. 97.00%
d. 98.00%
e. 99.00%
bg(Reliability,gmoderate)g{AACSB:gAnalyticgSkills}
461
