完整版供应链管理第三版Unit11习题与答案.docx
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完整版供应链管理第三版Unit11习题与答案
Chapter11
ManagingUncertaintyintheSupplyChain:
SafetyInventory
True/False
1.Safetyinventoryisinventorycarriedforthepurposeofsatisfyingdemandthatexceedstheamountforecastedforagivenperiod.
Answer:
True
Difficulty:
Moderate
2.Safetyinventoryiscarriedbecausedemandforecastsareaccurateandaproductshortagemayresultiftheforecastdemandexceedstheactualdemand.
Answer:
False
Difficulty:
Moderate
3.Raisingthelevelofsafetyinventoryincreasesproductavailabilityandthusthemargincapturedfromcustomerpurchases.
Answer:
True
Difficulty:
Moderate
4.Raisingthelevelofsafetyinventoryincreasesinventoryholdingcosts.
Answer:
True
Difficulty:
Easy
5.Carryingexcessiveinventorycanhelpcounterdemandvolatilitywhennewproductscomeonthemarket.
Answer:
False
Difficulty:
Moderate
6.Theappropriatelevelofsafetyinventoryisdeterminedbytheuncertaintyofbothdemandandsupplyandthedesiredlevelofcycleinventory.
Answer:
False
Difficulty:
Moderate
7.Astheuncertaintyofsupplyordemandgrows,therequiredlevelofsafetyinventoriesincreases.
Answer:
True
Difficulty:
Moderate
8.Asthedesiredlevelofproductavailabilityincreases,therequiredlevelofsafetyinventorydecreases.
Answer:
False
Difficulty:
Easy
9.Leadtimeisthegapbetweenwhenanorderisplacedandwhenitisreceived.
Answer:
True
Difficulty:
Easy
10.Thecoefficientofvariationmeasuresthesizeoftherelativecertaintyofcycleinventory.
Answer:
False
Difficulty:
Easy
11.Productavailabilityreflectsafirm’sabilitytofillacustomerorderoutofavailableinventory.
Answer:
True
Difficulty:
Moderate
12.Orderfillrateisthefractionofproductdemandthatissatisfiedfromproductininventory.
Answer:
False
Difficulty:
Moderate
13.Productfillrateisthefractionofproductdemandthatissatisfiedfromproductininventory.
Answer:
True
Difficulty:
Moderate
14.Thedistinctionbetweenproductfillrateandorderfillrateissignificantinasingleproductsituation.
Answer:
False
Difficulty:
Hard
15.Trackingorderfillratesisimportantwhencustomersplaceahighvalueontheentireorderbeingfilledsimultaneously.
Answer:
True
Difficulty:
Easy
16.Withcontinuousreview,inventoryiscontinuouslytrackedandanorderforalotsizeQisplacedatregularintervalsoftime.
Answer:
False
Difficulty:
Hard
17.Withperiodicreview,inventorystatusischeckedatregularintervalsandanorderisplacedtoraisetheinventoryleveltoaspecifiedthreshold.
Answer:
True
Difficulty:
Hard
18.Theexpectedshortageperreplenishmentcycle（ESC）istheaverageunitsofdemandthataresatisfiedfrominventoryinstockperreplenishmentcycle.
Answer:
False
Difficulty:
Hard
19.AshortageoccursinareplenishmentcycleonlyifthedemandduringtheleadtimeexceedstheROP.
Answer:
True
Difficulty:
Moderate
20.Thefillrateincreasesandthecycleserviceleveldecreasesasthesafetyinventoryisincreased.
Answer:
False
Difficulty:
Moderate
21.Forthesamesafetyinventory,anincreaseinlotsizeincreasesthefillratebutnotthecycleservicelevel.
Answer:
True
Difficulty:
Hard
22.Therequiredsafetyinventorygrowsrapidlywithadecreaseinthedesiredproductavailability.
Answer:
False
Difficulty:
Easy
23.Therequiredsafetyinventoryincreaseswithanincreaseintheleadtimeandthestandarddeviationofperiodicdemand.
Answer:
True
Difficulty:
Easy
24.Agoalofanysupplychainmanageristoreducethelevelofsafetyinventoryrequiredregardlessoftheaffectproductavailability.
Answer:
False
Difficulty:
Easy
25.Inmostsupplychains,thekeytoreducingtheunderlyingforecastuncertaintyistolinkallforecaststhroughoutthesupplychaintocustomerdemanddata.
Answer:
True
Difficulty:
Moderate
26.Areductioninsupplycanhelpdramaticallyreducesafetyinventoryrequiredwithouthurtingproductavailability.
Answer:
False
Difficulty:
Moderate
27.Aggregationreducesthestandarddeviationofdemandonlyifdemandacrosstheregionsbeingaggregatedisnotperfectlypositivelycorrelated.
Answer:
True
Difficulty:
Moderate
28.Incasedemandindifferentgeographicalregionsisaboutthesamesizeandindependent,aggregationincreasessafetyinventorybythesquarerootofthenumberofareasaggregated.
Answer:
False
Difficulty:
Moderate
29.Ifaggregationreducestherequiredsafetyinventoryforaproductbyasmallamount,itmaybebesttocarrytheproductinmultipledecentralizedlocationstoreduceresponsetimeandtransportationcost.
Answer:
True
Difficulty:
Moderate
30.Thelowerthecoefficientofvariationofanitem,thegreaterthereductioninsafetyinventoriesasaresultofcentralization.
Answer:
False
Difficulty:
Hard
31.Manufacturer-drivensubstitutionincreasesoverallprofitabilityforthemanufacturerbyallowingsomeaggregationofdemand,whichreducestheinventoryrequirementsforthesamelevelofavailability.
Answer:
True
Difficulty:
Moderate
32.Postponementallowsthesupplychaintodelayproductdifferentiation,whichresultsindisaggregatingmostoftheinventoriesinthesupplychain.
Answer:
False
Difficulty:
Moderate
33.Periodicreviewpoliciesrequiremoresafetyinventorythancontinuousreviewpoliciesforthesamelevelofproductavailability.
Answer:
True
Difficulty:
Easy
34.Whenusingacontinuousreviewpolicy,amanagerhastoaccountfortheuncertaintyofdemandduringtheleadtimeandthereviewinterval.
Answer:
False
Difficulty:
Easy
MultipleChoice
1.Inventorycarriedforthepurposeofsatisfyingdemandthatexceedstheamountforecastedforagivenperiodis
a.cycleinventory.
b.demandinventory.
c.safetyinventory.
d.securityinventory.
e.alloftheabove
Answer:
c
Difficulty:
Easy
2.Safetyinventoryiscarriedbecause
a.demandforecastsareaccurate.
b.demandforecastsareuncertain.
c.adequatesuppliesareavailable.
d.excessproductwasmanufactured.
e.forecastdemandexceedstheactualdemand.
Answer:
b
Difficulty:
Moderate
3.Thetrade-offthatasupplychainmanagermustconsiderwhenplanningsafetyinventoryis
a.increasingproductavailabilityversusincreasinginventoryholdingcosts.
b.decreasingproductavailabilityversusdecreasinginventoryholdingcosts.
c.increasingproductavailabilityversusraisingthelevelofsafetyinventory.
d.decreasingproductavailabilityversusdecreasingthelevelofsafetyinventory.
e.noneoftheabove
Answer:
a
Difficulty:
Moderate
4.Theissueofproductavailabilityandthelevelofsafetyinventoryisparticularlysignificantinindustrieswhere
a.productlifecyclesareshortanddemandisstable.
b.productlifecyclesareshortanddemandisveryvolatile.
c.productlifecyclesarelonganddemandisstable.
d.productlifecyclesarelonganddemandisveryvolatile.
e.aandbonly
Answer:
b
Difficulty:
Moderate
5.Akeytosuccessatwhichcompanyhasbeenitsabilitytoprovideahighlevelofproductavailabilitytocustomerswhilecarryingverylowlevelsofsafetyinventoryinitssupplychain?
a.Compaq
b.Hewlett-Packard
c.Dell
d.Packard-Bell
e.alloftheabove
Answer:
c
Difficulty:
Moderate
6.Whatkeyquestion（s）need（s）tobeconsideredwhenplanningsafetyinventoryforanysupplychain?
a.Whatistheappropriateleadtimetoestablish?
b.Whatistheappropriatelevelofsafetyinventorytocarry?
c.Whatactionscanbetakentoimproveproductavailabilitywhilereducingsafetyinventory?
d.aandbonly
e.bandconly
Answer:
e
Difficulty:
Moderate
7.Theappropriatelevelofsafetyinventoryisdeterminedby
a.theuncertaintyofbothdemandandsupply.
b.thedesiredlevelofproductavailability.
c.thedesiredlevelofcycleinventory.
d.theprocessesinasupplychainaredividedinto2categoriesdependingalloftheabove
e.aandbonly
Answer:
e
Difficulty:
Moderate
8.Astheuncertaintyofsupplyordemandgrows,therequiredlevelofsafetyinventories
a.decreases.
b.increases.
c.remainsstable.
d.bothaandb
e.noneoftheabove
Answer:
b
Difficulty:
Moderate
9.Asthedesiredlevelofproductavailabilityincreases,therequiredlevelofsafetyinventory
a.decreases.
b.increases.
c.remainsstable.
d.bothaandb
e.noneoftheabove
Answer:
e
Difficulty:
Moderate
10.Leadtimeisthegapbetween
a.whenanorderisplacedandwhenitisreceived.
b.whenanorderisreceivedandwhenitisputaway.
c.whenanorderisreceivedandwhenitisused.
d.whenanorderisacknowledgedandwhenitisreceived.
e.noneoftheabove
Answer:
a
Difficulty:
Easy
11.Thecoefficientofvariationmeasures
a.theaccuracyofthedemandforecast.
b.thesizeoftheuncertaintyrelativetodemand.
c.therelevanceofcycleinventorytodemand.
d.therelativecertaintyoftheforecast.
e.noneoftheabove
Answer:
b
Difficulty:
Moderate
12.Whichofthefollowingisnotameasureofproductavailability?
a.customerfillrate
b.productfillrate
c.orderfillrate
d.cycleservicelevel（CSL）
e.noneoftheabove
Answer:
a
Difficulty:
Moderate
13.Thefractionofordersthatarefilledfromavailableinventoryisthe
a.customerfillrate.
b.productfillrate.
c.orderfillrate.
d.cycleservicelevel（CSL）.
e.noneoftheabove
Answer:
c
Difficulty:
Easy
14.Thefractionofproductdemandthatissatisfiedfromproductininventoryisthe
a.customerfillrate.
b.productfillrate.
c.orderfillrate.
d.cycleservicelevel（CSL）.
e.noneoftheabove
Answer:
b
Difficulty:
Easy
15.Thefractionofreplenishmentcyclesthatendwithallthecustomerdemandbeingmetisthe
a.customerfillrate.
b.prod
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