工程流体力学智慧树知到课后章节答案2023年下山东大学

工程流体力学智慧树知到课后章节答案2023年下山东大学山东大学

第一章测试

Examplesofprimaryquantitiesarewhichofthefollowing?（）。

A:Length,Time,Mass,andTemperature

B:Size,Density,andTexture

C:None.

D:Length,Mass,andChemicalStructure

答案:Length,Time,Mass,andTemperature

WhichofthefollowingselectionsareallBritishGravitationalSystemunits?（）。

A:foot,pound,Newton,gallon

B:foot,minute,liter,Celsius,andkg

C:foot,second,pound,Rankin,andslug

D:foot,liter,Kelvin,Celsius,andpound

答案:foot,second,pound,Rankin,andslug

Specificvolumeisthereciprocalofwhatmeasurement?（）。

A:gravity

B:density

C:volume

D:mass

答案:density

Howcantheabsolutepressurebefoundbyusingthegagepressure?（）。

A:byaddingthegagepressureandtheatmosphericpressure

B:cannot

C:bysubtractingtheatmosphericpressurefromthegagepressure

D:byusingtheequationP=ρRT

答案:byaddingthegagepressureandtheatmosphericpressure

Fluidsforwhichtheshearingstressisnotlinearlyrelatedtotherateofshearingstrainaredesignatedaswhat?（）。

A:non-Newtonianfluid

B:viscousfluids

C:Newtonianfluid

D:None

答案:non-Newtonianfluid

第二章测试

Forabodypartiallysubmergedinafluidandatequilibrium,whichofthefollowingisatruestatement?（）。

A:Theweightofthebodyisgreaterthantheweightofthevolumeoffluiddisplaced

B:Theweightofthebodyisequaltotheweightofthevolumeoffluiddisplaced

C:Theweightofthebodyislessthantheweightofthevolumeoffluiddisplaced

D:Thespecificgravityofthebodyisgreaterthanthespecificgravityofthefluid

答案:Theweightofthebodyisequaltotheweightofthevolumeoffluiddisplaced

Aninclined-tubemanometerisbeingusedasshowntomeasurethepressureinapressurizedtank.Thetankispartiallyfilledtoadepthof20cmwithafluidofspecificgravity=0.78.Thespecificgravityofthemanometricgagefluidis3.5.Thegagepressureintheheadspace(kPa)whenh=8cmismostnearly（）。

A:1.2

B:0.9

C:1.8

D:0.3

答案:0.3

Acleanglasstubeistobeselectedinthedesignofamanometertomeasurethepressureofkerosene.Specificgravityofkerosene=0.82andsurfacetensionofkerosene=0.025N/m.Ifthecapillaryriseistobelimitedto1mm,thesmallestdiameter(cm)oftheglasstubeshouldbemostnearly（）。

A:2.00

B:1.75

C:1.50

D:1.25

答案:1.25

ThefigureshowstwocylindersofdiameterDand2D,connectedtoeachotherandcontaininganincompressiblefluid.Thetwocylindersarefittedwithleak-proofpistonsofweightW1andW2asshown.Whichofthefollowingisacorrectexpression?（）。

A:=

B:=

C:=

D:＝

答案:=

Thefigureshowstherelationshipbetweenshearstressandvelocitygradientfortwofluids,AandB.Whichofthefollowingisatruestatement?（）。

A:AbsoluteviscosityofAislessthanthatofB

B:KinematicviscosityofAisgreaterthanthatofB

C:KinematicviscosityofAislessthanthatofB

D:AbsoluteviscosityofAisgreaterthanthatofB

答案:AbsoluteviscosityofAisgreaterthanthatofB

第三章测试

Ifaflowisunsteady,its____maychangewithtimeatagivenlocation.（）。

A:Alloftheabove

B:Density

C:Velocity

D:Temperature

答案:Alloftheabove

Iftheflowissteady,therecanbechangesinvelocityatdifferentlocationsintheflowfield,TrueorFalse?（）

A:错B:对

答案:对

第四章测试

Afixedcoordinatesystemisnon-inertial.TrueorFalse?（）

A:对B:错

答案:错

Accordingtothesignconvention,massflowrateoutofthecontrolvolumeisnegativeandthemassflowrateinispositive.TrueorFalse?（）

A:错B:对

答案:错

WhenusingNewton'ssecondlawappliedacrossstreamlinesandtheBernoulliequationitisimportanttobesure____.（）。

A:thatalloftheassumptionsarenotviolated

B:thatthepressuregradientsdonotchange

C:Alloftheabove

D:thattheflowwillneverleavethestreamlines

答案:thatalloftheassumptionsarenotviolated

TheBernoulliequationcanbewrittenintermsofheightscalledwhat?（）。

A:meters

B:elevations

C:heads

D:levels

答案:heads

第五章测试

Howistheaccelerationofaparticledescribed?（）。

A:Throughthemassflowrateandthesurfaceintegral.

B:Byusingthematerialderivative.

C:none

D:ThroughNewtonianequations.

答案:Byusingthematerialderivative.

Howdoesvorticityrelatetotherotationvector?（）。

A:Vorticityistwicetherotationvector.

B:Doesnotmatter.

C:Vorticityisperpendiculartotherotationvector

D:Theyarethesame.

答案:Doesnotmatter.

Forirrotationalflow,thevorticityiszero.TrueorFalse?（）

A:对B:错

答案:对

Howdoesvorticityrelatetotherotationvector?（）。

A:Euler

B:Taylor

C:Maclaurin

D:Fourier

答案:Taylor

第六章测试

Dimensionalanalysisisthewhentheresultsofanequationwillbewhatinrelationtothesystemofunitschosen.（）。

A:None

B:Dependent

C:Constant

D:Independent

答案:Independent

Thedimensionsofthevariableontheleftsideoftheequationmustbe____thedimensionsofanytermthatstandsbyitselfontherightsideoftheequalsign.（）。

A:equalto

B:none

C:greaterthan

D:fewerthan

答案:equalto

Therequirednumberofpitermsiswhatcomparedtothenumberoforiginalvariables?（）。

A:none

B:greaterthan

C:fewerthan

D:equalto

答案:fewerthan

Whenusingtherepeatingvariablesmethod,thenumberofrepeatingvariablesthatareselectedshouldbewhatcomparedtothenumberofreferencedimensions?（）。

A:none

B:fewerthan

C:equalto

D:greaterthan

答案:equalto

第七章测试

Whatismostlikelytobethemaindrivingforceinpipeflow?（）。

A:Gravity

B:Vacuum

C:Force

D:Apressuregradient

答案:Apressuregradient

Thenatureofpipeflowis____.（）。

A:constant

B:stronglydependentonwhethertheflowislaminarorturbulent

C:random

D:turbulent

答案:stronglydependentonwhethertheflowislaminarorturbulent

Inthecaseoffullydevelopedpipeflow,____.（）。

A:thevelocityprofileisirregular.

B:theflowisacceleratingataconstantrate.

C:thevelocityprofileisthesameatanycrosssectionofthepipe.

D:random

答案:thevelocityprofileisthesameatanycrosssectionofthepipe.

Steady,fullydevelopedpipeflowexperiencesno____.（）。

A:None

B:Motion

C:Acceleration

D:Friction

答案:Acceleration

第八章测试

A2-in.diametershaftissupportedbytwosleeves,eachoflength=2in.Theinternaldiameterofthesleevesis2.1in.Theradialspacebetweentheshaftandthesleevesisfilledwithanoilofviscosity