Concrete Technology and Design of Concrete Structures Multiple Choice Questions and Answers - Preparation For Engineering
Concrete Technology and Design of Concrete Structures Multiple Choice Questions and Answers - Preparation For Engineering
Concrete Technology and Design of Concrete Structures Multiple Choice Questions and Answers - Preparation For Engineering
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ConcreteTechnologyandDesignofConcreteStructures
MultipleChoiceQuestionsandAnswers
Labels:CivilEngineering
1.Todeterminethemodulusofrupture,thesizeoftestspecimenusedis
a)
150x150x500mm
b)
100x100x700mm
c)
150x150x700mm
d)
100x100x500mm
Ans:c
2.Thepropertyoffreshconcrete,inwhichthewaterinthemixtendstorisetothesurface
whileplacingandcompacting,iscalled
a)
segregation
b)
bleeding
c)
bulking
d)
creep
Ans:b
3.Selecttheincorrectstatement
a)
Leanmixesbleedmoreascomparedtorichones.
b)
Bleedingcanbeminimizedbyaddingpozzuolanafineraggregate.
c)
Bleedingcanbeincreasedbyaddition'ofcalciumchloride.
d)
noneoftheabove
Ans:d
4.Thepropertyoftheingredientstoseparatefromeachotherwhileplacingtheconcreteis
called
a)
segregation
b)
compaction
c)
shrinkage
d)
bulking
Ans:a
5.Workabilityofconcreteisdirectlyproportionalto
a)
aggregatecementratio
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b)
timeoftransit
c)
gradingoftheaggregate
d)
allofabove
Ans:c
6.Workabilityofconcreteisinverselyproportionalto
a)
timeoftransit
b)
'vatercementratio
c)
theairinthemix
d)
sizeofaggregate
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Ans:a
7.Approximatevalueofshrinkagestraininconcrete,is
a)
0.003
b)
0.0003
c)
0.00003
d)
0.03
Ans:b
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8.Airentrainmentintheconcreteincreases
December(10)
a)
workability
November(16)
b)
strength
October(55)
c)
theeffectsoftemperaturevariations
d)
theunitweight
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Ans:a
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9.Therelationbetweenmodulusofrupturefcr,splittingstrengthfcsanddirecttensile
DesignofSteelStructuresMultiple
ChoiceQuestio...
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strengthfclisgivenby
a)
tcrrcs=tct
b)
fcr>fcs>fc.
C)fcr<fcs<fc>
d)fc5>fcr>fC.
Ans:b
10. Theapproximatevalueoftheratiobetweendirecttensilestrengthandflexuralstrength
is
a)
0.33
b)
0.5
c)
0.75
d)
1.0
Ans:b
11. Strengthofconcreteincreaseswith
a)
increaseinwatercementratio
b)
increaseinfinenessofcement
c)
decreaseincuringtime
d)
decreaseinsizeofaggregate
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Ans:b
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12. Therelationbetweenmodulusofrupturefcrandcharacteristicstrengthofconcretefckis
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givenby
a)
fcr=0.35Vf7
b)
fcr=0.57f7
c)
fcr=0.7Vf7
d)
fcr=1.2Vf7
wherefcrandfckareinN/mm2'
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Ans:c
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13.Thecompressivestrengthof100mmcubeascomparedto150mmcubeisalways
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a)
less
b)
more
c)
equal
d)
noneoftheabove
Ans:b
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14.AccordingtoIS:4561978,themodulusofelasticityofconcreteEc(inN/mm2)canbe
takenas
a)
Ec==5700
b)
Ec==570
c)
Ec==5700fck
d)Ec=wherefckN/mm2=700isthecharacteristicstrengthin
Ans:a
15.Increaseinthemoisturecontentinconcrete
a)
reducesthestrength
b)
increasesthestrength
c)
doesnotchangethestrength
d)
alloftheabove
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Ans:a
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16. Ascomparedtoordinaryportlandcement,useofpozzuolaniccement
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a)
reducesworkability
b)
increasesbleeding
c)
increasesshrinkage
d)
increasesstrength
Ans:c
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17. Admixtureswhichcauseearlysetting,andhardeningofconcretearecalled
a)
workabilityadmixtures
b)
accelerators
c)
retarders
d)
airentrainingagents
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18. Themostcommonlyusedadmixturewhichprolongsthesettingandhardeningtimeis
NetworkTheoremselectricalmultiple
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a)
gypsum
b)
calciumchloride
c)
sodiumsilicate
d)
alloftheabove
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choiceq...
Ans:a
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19. Thepercentageofvoidsincementisapproximately
EngineeringMaterialsMechanical
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a)
25%
b)
40%
MachineDesignMechanical
c)
60%
d)
80%
Ans:b
20. Thestrengthofconcreteafteroneyearascomparedto28daysstrengthisabout
a)
10to15%more
b)
15to20%more
c)
20to25%more
d)
25to50%more
Ans:c
21. Ascomparedtoordinaryportlandcement,highaluminacementhas
a)
higherinitialsettingtimebutlowerfinalsettingtime
b)
lowerinitialsettingtimebuthigherfinalsettingtime
c)
higherinitialandfinalsettingtimes
d)
lowerinitialandfinalsettingtimes
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Ans:a
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22. Modulusofruptureofconcreteisameasureof
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a)
flexuraltensilestrength
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b)
directtensilestrength
c)
compressivestrength
d)
splittensilestrength
Ans:a
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23. Inordertoobtainthebestworkabilityofconcrete,thepreferredshapeofaggregateis
a)
rounded
b)
elongated
c)
angular
d)
alloftheabove
Ans:a
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September(1)
24. Theeffectofaddingcalciumchlorideinconcreteis
i)
toincreaseshrinkage
ii)
todecreaseshrinkage
iii)
toincreasesettingtime
iv) todecreasesettingtime
Thecorrectansweris
a)
(i)and(iii)
b)
(i)and(iv)
c)
(ii)and(iii)
d)
(ii)and(iv)
Ans:b
25. Bulkingofsandismaximumifmoisturecontentisabout
a)
2%
b)
4%
c)
6%
d)
10%
Ans:b
26. Finergrindingofcement
a)
affectsonlytheearlydevelopmentofstrength
b)
affectsonlytheultimatestrength
c)
both(a)and(b)
d)
doesnotaffectthestrength
Ans:a
27. Poisson'sratioforconcrete
a)
remainsconstant
b)
increaseswithrichermixes
c)
decreaseswithrichermixes
d)
noneoftheabove
Ans:b
28. 1%ofvoidsinaconcretemixwouldreduceitsstrengthbyabout
a)
5%
b)
10%
c)
15%
d)
20%
Ans:a
29.Thefinenessmodulusoffineaggregateisintherangeof
a)
2.0to3.5
b)
3.5to5.0
c)
5.0to7.0
d)
6.0to8.5
Ans:a
30.Thefactorofsafetyfor
a)
steelandconcretearesame
b)
steelislowerthanthatforconcrete
c)
steelishigherthanthatforconcrete
d)
noneoftheabove
Ans:b
31.Examinethefollowingstatements:
i)Factorofsafetyforsteelshouldbebasedonitsyieldstress,
ii)Factorofsafetyforsteelshouldbebasedonitsultimatestress,
iii)Factorofsafetyforconcreteshouldbebasedonitsyieldstress,
iv)Factorofsafetyforconcreteshouldbebasedonitsultimatestress.
Thecorrectstatementsare
a)
(i)and(iii)
b)
(i)and(iv)
c)
(ii)and(iii)
d)
(ii)and(iv)
Ans:b
32. Forareinforcedconcretesection,theshapeofshearstressdiagramis
a)
whollyparabolic
b)
whollyrectangular
c)
parabolicaboveneutralaxisandrectangularbelowneutralaxis
d)
rectangularaboveneutralaxisandparabolicbelowneutralaxis
Ans:c
33. Diagonaltensioninabeam
a)
ismaximumatneutralaxis
b)
decreasesbelowtheneutralaxisandincreasesabovetheneutralaxis
c)
increasesbelowtheneutralaxisanddecreasesabovetheneutralaxis
d)
remainssame
Ans:c
34.Ifabeamfailsinbond,thenitsbondstrengthcanbeincreasedmosteconomicallyby
a)
increasingthedepthofbeam
b)
usingthinnerbarsbutmoreinnumber
c)
usingthickerbarsbutlessinnumber
d)
providingverticalstirrups
Ans:b
35.Ifnominalshearstresstvexceedsthedesignshearstrengthofconcretexc,thenominal
shearreinforcementasperIS:4561978shallbeprovidedforcarryingashearstressequal
to
a)
xv
b)
xc
c)
xvTC
d)
Tv+Tc
Ans:c
36. Ifthedepthofactualneutralaxisinabeamismorethanthedepthofcriticalneutral
axis,thenthebeamiscalled
a)
balancedbeam
b)
underreinforcedbeam
c)
overreinforcedbeam
d)
noneoftheabove
Ans:c
37. Ifthedepthofneutralaxisforasinglyreinforcedrectangularsectionisrepresentedby
kdinworkingstressdesign,thenthevalueofkforbalancedsection
a)
dependsonas,only
b)
dependsonaCbConly
c)
dependsonbothcrstandacbc
d)
isindependantofbothastandacbcwheredistheeffectivedepth,astispermissible
stressinsteelintensionandocbcispermissiblestressinconcreteinbendingcompression.
Ans:a
38.Ifthepermissiblestressinsteelintensionis140N/mm2,thenthedepthofneutralaxis
forasinglyreinforcedrectangularbalancedsectionwillbe
a)
0.35d
b)
0.40d
c)
0.45d
d)
dependentongradeofconcretealso
Ans:b
39. ModulusofelasticityofsteelasperIS:4561978shallbetakenas
a)
20kN/cm2
b)
200kN/cm2
c)
200kN/mm2
d)
2xl06N/cm2
Ans:c
40. MinimumgradeofconcretetobeusedinreinforcedconcreteasperIS:4561978is
a)
M15
b)
M20
c)
M10
d)
M25
Ans:a
41. Forconcretingofheavilyreinforcedsectionswithoutvibration,theworkabilityof
concreteexpressedascompacting
factorshouldbe
a)
0.750.80
b)
0.800.85
c)
0.850.92
d)
above0.92
Ans:d
42. Maximumquantityofwaterneededper50kgofcementforM15gradeofconcreteis
a)
28litres
b)
30litres
c)
32litres
d)
34litres
Ans:c
43. Incaseofhandmixingofconcrete,theextracementtobeaddedis
a)
5%
b)
10%
c)
15%
d)
20%
Ans:b
44. Forwalls,columnsandverticalfacesofallstructuralmembers,theformworkis
generallyremovedafter
a)
24to48hours
b)
3days
c)
7days
d)
14days
Ans:a
45. Theindividualvariationbetweenteststrengthofsampleshouldnotbemorethan
a)
5%ofaverage
b)
10%ofaverage
c)
15%ofaverage
d)
20%ofaverage
Ans:c
46. >Inaboveformula,l0signifies
a)
effectivespanofTbeam
b)
distancebetweenpointsofzeromomentsinthebeam
c)
distancebetweenpointsofmaximummomentsinthebeam
d)
clearspanoftheTbeam
Ans:b
47. Foracantileverofeffectivedepthof0.5m,themaximumspantosatisfyvertical
deflectionlimitis
a)
3.5m
b)
4m
c)
4.5m
d)
5m
Ans:a
48. Forasimplysupportedbeamofspan15m,theminimumeffectivedepthtosatisfythe
verticaldeflectionlimitsshouldbe
a)
600mm
b)
750mm
c)
900mm
d)
morethan1m
Ans:b
49. Foracontinuousslabof3mx3.5msize,theminimumoveralldepthofslabtosatisfy
verticaldeflectionlimitsis
a)
50mm
b)
75mm
c)
100mm
d)
120mm
Ans:b
50. AccordingtoIS:4561978,thefiexuralstrengthofconcreteis
a)
directlyproportionaltocompressivestrength
b)
inverselyproportionaltocompressivestrength
c)
directlyproportionaltosquarerootofcompressivestrength
d)
inverselyproportionaltosquarerootofcompressivestrength
Ans:c
51. AccordingtoIS:4561978,thecblumnorthestrutisthememberwhoseeffective
lengthisgreaterthan
a)
theleastlateraldimension
b)
2timestheleastlateraldimension
c)
3timestheleastlateraldimension
d)
4timestheleastlateraldimension
Ans:c
52. AccordingtoIS:4561978,minimumslendernessratioforashortcolumnis
a)
lessthan12
b)
lessthan18
c)
between18and24
d)
morethan24
Ans:a
53. Laplengthincompressionshallnotbelessthan
a)
154>
b)
20<}>
c)
24(j)
d)
30(j)
where(j)isdiameterofbar
Ans:c
54. Theminimumcoverinaslabshouldneitherbelessthanthediameterofbarnorless
than
a)
10mm
b)
15mm
c)
25mm
d)
13mm
Ans:b
55. Foralongitudinalreinforcingbarinacolumn,theminimumcovershallneitherbeless
thanthediameterofbarnorlessthan
a)
15mm
b)
25mm
c)
30mm
d)
40mm
Ans:d
56. Theratioofthediameterofreinforcingbarsandtheslabthicknessis
a)
1/4
b)
1/5
c)
1/6
d)
1/8
Ans:d
57. AccordingtoIS:4561978,themaximumreinforcementinacolumnis
a)
2%
b)
4%
c)
6%
d)
8%
Ans:c
58. Thepercentageofreinforcementincaseofslabs,whenhighstrengthdeformedbars
areusedisnotlessthan
a)
0.15
b)
0.12
c)
0.30
d)
1.00
Ans:b
59. Whichofthefollowingstatementsisincorrect?
a)
Minimumcrosssectionalareaoflongitudinalreinforcementinacolumnis0.8%.
b)
Spacingoflongitudinalbarsmeasuredalongtheperipheryofcolumnshouldnotexceed
300mm.
c)
Reinforcingbarsinacolumnshouldnotbelessthan12mmindiameter.
d)
Thenumberoflongitudinalbarsprovidedinacircularcolumnshouldnotbelessthan
four.
Ans:d
60. Whichofthefollowingstatementsisincorrect?
a)HigherVeeBeetimeshowslowerworkability.
b)
Higherslumpshowshigherworkability.
c)
Highercompactingfactorshowshigherworkability.
d)
noneoftheabove
Ans:d
61.Minimumpitchoftransversereinforcementinacolumnis
a)
theleastlateraldimensionofthemember
b)
sixteentimesthesmallestdiameteroflongitudinalreinforcementbartobetied
c)
fortyeighttimesthediameteroftransversereinforcement
d)
lesseroftheabovethreevalues
Ans:d
62.MaximumdistancebetweenexpansionjointsinstructuresasperIS:4561978is
a)
20m
b)
30m
c)
45m
d)
60m
Ans:c
63. Acontinuousbeamisdeemedtobeadeepbeamwhentheratioofeffectivespanto
overalldepth(1/D)islessthan
a)
1.5
b)
2.0
c)
2.5
d)
3.0
Ans:c
64. Criticalsectionforshearincaseofflatslabsisatadistanceof
a)
effectivedepthofslabfromperipheryofcolumn/droppanel
b)
d/2fromperipheryofcolumn/capital/droppanel
c)
atthedroppanelofslab
d)
attheperipheryofcolumn
Ans:b
65. MinimumthicknessofloadbearingRCCwallshouldbe
a)
50mm
b)
100mm
c)
150mm
d)
200mm
Ans:b
66. IfthestoreyheightisequaltolengthofRCCwall,thepercentageincreaseinstrengthis
a)
b)
10
c)
20
d)
30
Ans:b
67. Inreinforcedconcretefootingonsoil,theminimumthicknessatedgeshouldnotbeless
than
a)
100mm
b)
150mm
c)
200mm
d)
250mm
Ans:b
68. Theslabisdesignedasonewayiftheratiooflongspantoshortspanis
a)
lessthan1
b)
between1and1.5
c)
between1.5and2
d)
greaterthan2
Ans:d
69. Ratioofpermissiblestressindirectcompressionandbendingcompressionis
a)
lessthan1
b)
between1and1.5
c)
between1.5and2.0
d)
greaterthan2
Ans:a
70. Ahighermodularratioshows
a)
highercompressivestrengthofconcrete
b)
lowercompressivestrengthofconcrete
c)
highertensilestrengthofsteel
d)
lowertensilestrengthofsteel
Ans:b
71. Theaveragepermissiblestressinbondforplainbarsintensionis
a)
increasedby10%forbarsincompression
b)
increasedby25%forbarsincompression
c)
decreasedby10%forbarsincompression
d)
decreasedby25%forbarsincompression
Ans:b
74. Inworkingstressdesign,permissiblebondstressinthecaseofdeformedbarsismore
thanthatinplainbarsby
a)
10%
b)
20%
c)
30%
d)
40%
Ans:d
75. Themainreasonforprovidingnumberofreinforcingbarsatasupportinasimply
supportedbeamistoresistinthatzone
a)
compressivestress
b)
shearstress
c)
bondstress
d)
tensilestress
Ans:c
76. Halfofthemainsteelinasimplysupportedslabisbentupnearthesupportata
distanceofxfromthecentreofslabbearingwherexisequalto
a)
1/3
b)
1/5
c)
1/7
d)
1/10
where1isthespan
Ans:c
77. Whenshearstressexceedsthepermissiblelimitinaslab,thenitisreducedby
a)increasingthedepth
b)
providingshearreinforcement
c)
usinghighstrengthsteel
d)
usingthinnerbarsbutmoreinnumber
Ans:a
78.Ifthesizeofpanelinaflatslabis6mx6m,thenasperIndianStandardCode,thewidths
ofcolumnstripandmiddlestripare
a)
3.0mand1.5m
b)
1.5mand3.0m
c)
3.0mand3.0m
d)
1.5mand1.5m
Ans:c
79.Foraslabsupportedonitsfouredgeswithcornershelddownandloadeduniformly,the
MarcuscorrectionfactortothemomentsobtainedbyGrashoffRankine'stheory
a)
isalwayslessthan1
b)
isalwaysgreaterthan1
c)
canbemorethan1
d)
canbelessthan1
Ans:a
80.Thepermissiblediagonaltensilestressinreinforcedbrickworkis
a)
about0.1N/mm2
b)
zero
c)
0.3N/mm2to0.7N/mm2
d)
about1.0N/mm2
Ans:a
81. Thelimitsofpercentagepofthelongitudinalreinforcementinacolumnisgivenby
a)
0.15%to2%
b)
0.8%to4%
c)
0.8%to6%
d)
0.8%to8%
Ans:c
82. Theminimumdiameteroflongitudinalbarsinacolumnis
a)
6mm
b)
8mm
c)
12mm
d)
16mm
Ans:c
83. Theminimumcovertothetiesorspiralsshouldnotbelessthan
a)
15mm
b)
20mm
c)
25mm
d)
50mm
Ans:c
84. Theloadcarryingcapacityofahelicallyreinforcedcolumnascomparedtothatofatied
columnisabout
a)
5%less
b)
10%less
c)
5%more
d)
10%more
Ans:c
86.Thediameteroftiesinacolumnshouldbe
a)
morethanorequaltoonefourthofdiameterofmainbar
b)
morethanorequalto5mm
c)
morethan5mmbutlessthanonefourthofdiameterofmainbar
d)
morethan5mmandalsomorethanonefourthofdiameterofmainbar
Ans:d
87. Duetocircumferentialactionofthespiralinaspirallyreinforcedcolumn
a)
capacityofcolumnisdecreased
b)
ductilityofcolumnreduces
c)
capacityofcolumnisdecreasedbutductilityofcolumnincreases
d)
boththecapacityofcolumnandductilityofcolumnincrease
Ans:d
88. Maximumpercentagereinforcementincaseofslabsislimitedto
a)
b)
c)
d)
Ans:b
89. WhichofthefollowingR.C.retainingwallsissuitableforheightsbeyond6m?
a)Lshapedwall
b)
Tshapedwall
c)
counterforttype
d)
alloftheabove
Ans:c
90. Forthedesignofretainingwalls,theminimumfactorofsafetyagainstoverturningis
takenas
a)
1.5
b)
2.0
c)
2.5
d)
3.0
Ans:b
91. Incounterforttyperetainingwalls
i)theverticalslabisdesignedasacontinuousslab
ii)theheelslabisdesignedasacontinuousslab
iii)theverticalslabisdesignedasacantilever
iv)theheelslabisdesignedasacantilever
Thecorrectansweris
a)
(i)and(ii)
b)
(i)and(iv)
c)
(ii)and(iii)
d)
(iii)and(iv)
Ans:a
92. ATshapedretainingwallmainlyconssitsof
a)
onecantilever
b)
twocantilevers
c)
threecantilevers
d)
fourcantilevers
Ans:c
93. InTshapedRC.retainingwalls,themainreinforcementinthestemisprovidedon
a)
thefrontfaceinonedirection
b)
thefrontfaceinbothdirections
c)
theinnerfaceinonedirection
d)
theinnerfaceinbothdirections
Ans:c
94. ThemainreinforcementinthetoeofaTshapedRC.retainingwallisprovidedon
i)topfaceparalleltothewall
ii)
topfaceperpendiculartothewall
iii)
bottomfaceparalleUothewall
iv) bottomfaceperpendiculartothewall
Thecorrectansweris
a)
only(ii)iscorrect
b)
(i)and(ii)arecorrect
c)
(iii)and(iv)arecorrect
d)
only(iv)iscorrect
Ans:d
95. ThetemperaturereinforcementintheverticalslabofaTshapedR.C.retainingwallis
a)
notneeded
b)
providedequallyoninnerandfrontfaces
c)
providedmoreoninnerfacethanonfrontface
d)
providedmoreonfrontfacethanoninnerface
Ans:d
96. ThemainreinforcementintheheelofaTshapedR.C.retainingwallisprovidedon
a)
topfaceperpendiculartowall
b)
bottomfaceperpendiculartowall
c)
bothtopandbottomfacesperpendiculartowall
d)
noneoftheabove
Ans:a
97. Inacounterfortretainingwall,themainreinforcementisprovidedonthe
i)
bottomfaceinfrontcounterfort
ii)
inclinedfaceinfrontcounterfort
iii)
bottomfaceinbackcounterfort
iv) inclinedfaceinbackcounterEort
The correctansweris
a)
(i)and(ii),
b)
(ii)and(iii)
c)
(i)and(iv)
d)
(iii)and(iv)
Ans:c
98. Incounterfortretainingwalls,themainreinforcementinthestematsupportis
a)
notprovided
b)
providedonlyoninnerface
c)
providedonlyonfrontface
d)
providedbothoninnerandfrontfaces
Ans:b
99. Inthedesignofafrontcounterfortinacounterfortretainingwall,themainreinforcement
isprovidedon
i)bottomfacenearcounterfort
ii)topfacenearcounterfort
iii)bottomfacenearcentreofspan
iv)topfacenearcentreofspanThecorrectansweris
a)
only(i)
b)
only(ii)
c)
both(i)and(iv)
d)
both(ii)and(iii)
Ans:c
100.Inacounterfortretainingwall,themainreinforcementinthestematmidspanis
providedon
a)
frontfaceonly
b)
innerfaceonly
c)
bothfrontfaceandinnerface
d)
noneoftheabove
Ans:a
101.Thedepthoffootingforanisolatedcolumnisgovernedby
i)maximumbendingmoment
ii)shearforce
iii)punchingshearThecorrectansweris
a)
only(i)
b)
(i)and(ii)
c)
(i)and(iii)
d)
(i),(ii)and(iii)
Ans:d
102.Ifthefoundationsofallthecolumnsofastructurearedesignedonthetotalliveand
deadloadbasis,then
a)
therewillbenosettlementofcolumns
b)
therewillbenodifferentialsettlement
c)
thesettlementofexteriorcolumnswillbemorethaninteriorcolumns
d)
thesettlementofinteriorcolumnswillbemorethanexteriorcolumns
Ans:c
103.Tominimisetheeffectofdifferentialsettlement,theareaofafootingshouldbe
designedfor
a)
deadloadonly
b)
deadload+liveload
c)
deadload+fractionofliveload
d)
liveload+fractionofdeadload
Ans:c
104.Thecriticalsectionforfindingmaximumbendingmomentforfootingundermasonrywall
islocated
a)
atthemiddleofthewall
b)
attheedgeofthewall
c)
halfwaybetweenthemiddleandedgeofthewall
d)
atadistanceequaltoeffectivedepthoffootingfromtheedgeofthewall
Ans:c
105.Inapileoflength/,thepointsofsuspensionfromendsforliftingitarelocatedat
a)
0.2071
b)
0.25/
c)
0.293/
d)
0.333/
Ans:a
106.Duringerection,thepileoflength/issupportedbyacraneatadistanceof
a)
0.207/
b)
0.293/
c)
0.7071
d)
0.793/
fromthedrivingendofpilewhichrestsontheground
Ans:c
107.Whiledesigningthepileasacolumn,theendconditionsarenearly
a)
bothendshinged
b)
bothendsfixed
c)
oneendfixedandotherendhinged
d)
oneendfixedandotherendfree
Ans:c
108.Therecommendedvalueofmodularratioforreinforcedbrickworkis
a)
18
b)
30
c)
40
d)
58
Ans:c
109.AccordingtoISIrecommendations,themaximumdepthofstressblockforbalanced
sectionofabeamofeffectivedepthdis
a)
0.43d
b)
0.55d
c)
0.68d
d)
0.85d
Ans:a
110.AssertionA:Theloadfactorforliveloadisgreaterthanthatfordeadload.
ReasonR:Theliveloadsaremoreuncertainthandeadloads.
Selectyouranswerbasedonthecodingsystemgivenbelow:
a)
BothAandRaretrueandRisthecorrectexplanationofA.
b)
BothAandRaretruebutRisnotthecorrectexplanationofA.
c)
AistruebutRisfalse.
d)
AisfalsebutRistrue.
Ans:a
111.Thecentroidofcompressiveforce,fromtheextremecompressionfibre,inlimitstate
designliesatadistanceof
a)
0.367xu
b)
0.416xu
c)
0.446xu
d)
0.573xu
wherexuisthedepthofneutralaxisatthelimitstateofcollapse
Ans:b
112.ThedesignyieldstressofsteelaccordingtoIS:4561978is
a)
0.37fy
b)
0.57fy
c)
0.67fy
d)
0.87fy
wherefyisthecharacteristicyieldstrengthofsteel
Ans:d
113.AccordingtoWhitney'stheory,ultimatestrainofconcreteisassumedtobe
a)
0.03%
b)
0.1%
c)
0.3%
d)
3%
Ans:c
114.AccordingtoWhitney'stheory,depthofstressblockforabalancedsectionofaconcrete
beamislimitedto
a)
0.43d
b)
0.537d
c)
0.68d
d)
0.85d
wherediseffectivedepthofbeam[ES2k]
Ans:b
115.Theloadfactorsforliveloadanddeadloadaretakenrespectivelyas
a)
1.5and2.2
b)
2.2and1.5
c)
1.5and1.5
d)
2.2and2.2
Ans:b
116.AsperWhitney'stheory,themaximummomentofresistanceofthebalancedsectionof
abeamofwidthbandeffective
depthdisgivenby
a)
^acybd2
b)
^acybd2
c)
0.185acybd2
d)
0.43acybd2
whereacyisthecylindercompressivestrengthofconcrete
Ans:b
127.Theeffectofcreeponmodularratiois
a)
todecreaseit
b)
toincreaseit
c)
eithertodecreaseortoincreaseit
d)
tokeepitunchanged
Ans:b
128.Shrinkageofconcretedependsupon
i)humidityofatmosphere
ii)passageoftime
iii)stressThecorrectansweris
a)
(i)and(ii)
b)
(ii)and(iii)
c)
only(iii)
d)
All(i),(ii)and(iii)
Ans:a
129.Duetoshrinkagestresses,asimplysupportedbeamhavingreinforcementonlyat
bottomtendsto
a)
deflectdownward
b)
deflectupward
c)
deflectdownwardorupward
d)
noneoftheabove
Ans:a
130.Insymmetricallyreinforcedsections,shrinkagestressesinconcreteandsteelare
respectively
a)
compressiveandtensile
b)
tensileandcompressive
c)
bothcompressive
d)
bothtensile
Ans:b
131.Abeamcurvedinplanisdesignedfor
a)
bendingmomentandshear
b)
bendingmomentandtorsion
c)
shearandtorsion
d)
bendingmoment,shearandtorsion
Ans:d
132.Inasphericaldomesubjectedtoconcentratedloadatcrownoruniformlydistributed
load,themeridionalforceis
always
a)
zero
b)
tensile
c)
compressive
d)
tensileorcompressive
Ans:c
133.Sinkingofanintermediatesupportofacontinuousbeam
i)reducesthenegativemomentatsupport
ii)increasesthenegativemomentatsupport
iii)reducesthepositivemomentatcentreofspan
iv)increasesthepositivemomentatcentreofspanThecorrectansweris
a)
(i)and(iii)
b)
(i)and(iv)
c)
(ii)and(iii)
d)
(ii)and(iv)
Ans:b
134.Themaximumvalueofhoopcompressioninadomeisgivenby
a)
wR/4d
b)
wR/2d
c)
wR/d
d)
2wR/d
where,w=loadperunitareaofsurfaceofdomeR=radiusofcurvatured=thicknessof
dome
Ans:b
135.Inasphericaldomethehoopstressduetoaconcentratedloadatcrownis
a)
compressiveeverywhere
b)
tensileeverywhere
c)
partlycompressiveandpartlytensile
d)
zero
Ans:b
136.Inaringbeamsubjectedtouniformlydistributedload
i)shearforceatmidspaniszero
ii)shearforceatmidspanismaximum
iii)torsionatmidspaniszero
iv)torsionatmidspanismaximumThecorrectansweris
a)
(i)and(iii)
b)
(i)and(iv)
c)
(ii)and(iii)
d)
(ii)and(iv)
Ans:a
137.Inprestressedconcrete
a)
forcesoftensionandcompressionchangebutleverarmremainsunchanged
b)
forcesoftensionandcompressionsremainunchangedbutleverarmchangeswiththe
moment
c)
bothforcesoftensionandcompressionaswellasleverarmchange
d)
bothforcesoftensionandcompressionaswellasleverarmremainunchanged
Ans:b
138.Thepurposeofreinforcementinprestressedconcreteis
a)
toprovideadequatebondstress
b)
toresisttensilestresses
c)
toimpartinitialcompressivestressinconcrete
d)
alloftheabove
Ans:c
139.Normallyprestressingwiresarearrangedinthe
a)
upperpartofthebeam
b)
lowerpartofthebeam
c)
centre
d)
anywhere
Ans:b
140.Mostcommonmethodofprestressingusedforfactoryproductionis
a)
Longlinemethod
b)
Freyssinetsystem
c)
MagnelBlatonsystem
d)
LeeMacallsystem
Ans:a
141.Selecttheincorrectstatement
a)
Thelossofprestressismoreinpretensioningsystemthaninposttensioningsystem.
b)
Pretensioningsystemhasgreatercertaintyaboutitsdurability.
c)
Forheavyloadsandlargespansinbuildingsorbridges,posttensioningsystemis
cheaperthanpretensioningsystem
d)
noneoftheabove
Ans:d
142.Whichofthefollowinglossesofprestressoccursonlyinpretensioningandnotinpost
tensioning?
a)
elasticshorteningofconcrete
b)
shrinkageofconcrete
c)
creepofconcrete
d)
lossduetofriction
Ans:a
143.Prestresslossduetofrictionoccurs
a)
onlyinposttensionedbeams
b)
onlyinpretensionedbeams
c)
inbothposttensionedandpretensionedbeams
d)
noneoftheabove
Ans:a
145.Whichofthefollowinghashightensilestrength?
a)
plainhotrolledwires
b)
colddrawnwires
c)
heattreatedrolledwires
d)
allhavesametensilestrength
Ans:b
146.Highcarboncontentinthesteelcauses
a)
decreaseintensilestrengthbutincreaseinductility
b)
increaseintensilestrengthbutdecreaseinductility
c)
decreaseinbothtensilestrengthandductility
d)
increaseinbothtensilestrengthandductility
Ans:b
147.Stressstraincurveofhightensilesteel
a)
hasadefiniteyieldpoint
b)
doesnotshowdefiniteyieldpointbutyieldpointisdefinedby0.1%proofstress
c)
doesnotshowdefiniteyieldpointbutyieldpointisdefinedby0.2%proofstress
d)
doesnotshowdefiniteyieldpointbutyieldpointisdefinedby2%proofstress,
Ans:c
148.Selectthecorrectstatement
a)
Elasticmodulusofhightensilesteelisnearlythesameasthatofmildsteel.
b)
Elasticmodulusofhightensilesteelismorethanthatofmildsteel.
c)
Carbonpercentageinhighcarbonsteelislessthanthatinmildsteel.
d)
Hightensilesteelischeaperthanmildsteel.
Ans:a
149.Cubestrengthofcontrolledconcretetobeusedforpretensionedandposttensioned
workrespectivelyshouldnotbelessthan
a)
35MPaand42MPa
b)
42MPaand35MPa
c)
42MPaand53MPa
d)
53MPaand42MPa
Ans:b
150.Ultimatestrengthofcolddrawnhighsteelwires
a)
increaseswithincreaseindiameterofbar
b)
decreaseswithincreaseindiameterofbar
c)
doesnotdependondiameterofbar
d)
noneoftheabove
Ans:b
151.Prestressinglossesinposttensionedandpretensionedbeamsarerespectively
a)
15%and20%
b)
20%and15%
c)
15%and15%
d)
20%and20%
152.Inconcrete,useofangularcrushedaggregateinplaceofnaturalroundedgravelaffects
a)
directtensilestrength
b)
splittensilestrength
c)
flexuraltensilestrength
d)
compressivestrength
153.Ratioofcompressivestrengthtotensilestrengthofconcrete
a)
increaseswithage
b)
decreaseswithage
c)
remainsconstant
d)
noneoftheabove
154.AccordingtoIndianStandards,thegradingoffineaggregatesisdividedinto
a)
twozones
b)
threezones
c)
fourzones
d)
fivezones
155.AssertionA:Lightweightconcreteexhibitshighershrinkagethannormalweight
concrete.
ReasonR:Modulusofelasticityoflightweightconcreteislower,thanthatofnormalweight
concrete.Selectyouransweraccordingtothecodingsystemgivenbelow:
a)
BothAandRaretrueandRisthecorrectexplanationofA
b)
BothA.andRaretruebutRisnotthecorrectexplanationofA
c)
AistruebutRisfalse
d)
AisfalsebutRistrue
156.Endurancelimitofmildsteelisapproximatelyequalto,
a)
0.3
b)
0.5
c)
0.7
d)
0.8
Endurancelimitisdefinedasthemaximumvalueoftheratioofmaximumstresstoshort
timestaticstrength,belowwhichnofailureoccurs.
157.Withtheincreaseinrateofloadingduringtesting,compressivestrengthofconcrete
a)
increases
b)
decreases
c)
remainssame
d)
noneoftheabove
158.Foragivenaggregatecontent,increasingthewatercementratioinconcrete
a)
increasesshrinkage
b)
decreasesshrinkage
c)
doesnotchangeshrinkage
d)
noneoftheabove
159.AssertionA:Thenetlossofstrengthduetoairentrainmentofarichermixishigher
thanthatofaleanermix.ReasonR:Effectofairentrainmentonimprovingworkabilityis
smallerinrichermixthaninaleanermix.Selectyouranswerbasedonthecodingsystem
givenbelow
a)
BothAandRaretrueandRisthecorrectexplanationofA
b)
BothAandRaretruebutRisnotthecorrectexplanationofA
c)
AistruebutRisfalse
d)
AisfalsebutRistrue
160.Thebondstrengthbetweensteelreinforcementandconcreteisaffectedbyi)
steelpropertiesii)concretepropertiesiii)shrinkageofconcreteThecorrectansweris
a)
(i)and(ii)
b)
(ii)and(iii)
c)
(i)and(iii)
d)
(i),(ii)and(iii)
161.Thebondstrengthbetweensteelandconcreteisdueto
a)
friction
b)
adhesion
c)
bothfrictionandadhesion
d)
noneoftheabove
162.Impactstrengthofconcreteincreasesbyusing
i)smallermaximumsizeofaggregate
ii)aggregatewithhighmodulusofelasticity
iii)aggregatewithlowpoisson'sratioThecorrectansweris
a)
(i)and(ii)
b)
(ii)and(iii)
c)
(i)and(iii)
d)
(i),(ii)and(iii)
163.Impactstrengthofconcreteisgreaterfor
i)waterstoredconcretethanfordryconcrete
ii)angularcrushedaggregates
iii)roundedaggregatesThecorrectansweris
a)
(i)and(ii)
b)
(i)and(iii)
c)
only(i)
d)
only(ii)
164.Ifthecontributionsoftricalciumsilicate,dicalciumsilicate,tricalciumaluminate
andterracalciumaluminoferritetothe28daysstrengthofhydratedordinaryPortland
cementarerespectivelyW,X,Y
andZ,then
a)
W>.X>Y>Z
b)
X>W>Y>Z
c)
W>X>Z>Y
d)
W>Y>X>Z
165.Theinitialandfinalsettingtimesforordinaryportlandcementareapproxi
matelyrelatedas
a)
T=530+t
b)
T=270+t
c)
T=90+1.2t
d)
T=6001.2t
whereTandtarerespectivelyfinalandinitialsettingtimesinminutes.*166AssertionA:
Thepresenceoftricalciumaluminateincementisundesirable.ReasonR:Tricalcium
aluminateincementcontributesverylittletostrengthofcement.
Selectyouranswerbasedonthecodingsystemgivenbelow
a)
BothAandRaretrueandRisthecorrectexplanationofA
b)
BothAandRaretruebutRisnotthecorrectexplanationofA
c)
AistruebutRisfalse
d)
AisfalsebutRistrue
167.Amountofgypsumrequiredtobeaddedtotheclinkerdependsonthefollowing
contentsofcementi)tricalciumsilicateii)dicalciumsilicateiii)tricalciumaluminateiv)
alkaliThecorrectansweris
a)
(i)and(ii)
b)
(ii)and(iii)
c)
(iii)and(iv)
d)
(i)and(iv)
168.ThediameterofneedleusedinVicat'sapparatusforthedeterminationofinitial
settingtimeisprescribedas
a)
0.5mm
b)
1mm
c)
5mm
d)
10mm
169.Theheatofhydrationofcementcanbereducedby
a)
reducingtheproportionsofC3AandC3S
b)
increasingtheproportionsofC3AandC3S
c)
increasingthefinenessofcement
d)
both(a)and(c)
171.AssertionA:Rapidhardeningcementisgenerallynotusedinmassconcrete
construction.
ReasonR:Therateofheatdevelopmentislowinrapidhardeningcement.Selectyour
answerbasedonthecodingsystemgivenbelow
a)
BothAandRaretrueandRisthecorrectexplanationofA.
b)
BothAandRaretruebutRisnotthecorrectexplanationofA.
c)
AistruebutRisfalse.
d)
AisfalsebutRistrue.
172.Iftheangularitynumberofanaggregateisincreased,thentheworkabilityofthe
concreteusingthisaggregatewill
a)
increase
b)
decrease
c)
notchange
d)
noneoftheabove
173.IfW,,W2,W3andW4aretheweightsofsandinovendry,airdry,saturatedbut
surfacedryandmoistconditionsrespectively,thenthemoisturecontentofsandis
a)
W3W,
b)
W4W2
c)
W4W3
d)
W3W2
174.Theordinateofgradingcurveofanaggregaterepresents
a)
cumulativepercentagepassingeachsieveplottedonnormalscale
b)
cumulativepercentagepassingeachsieveplottedonlogarithmicscale
c)
sievesizeplottedonnormalscale
d)
sievesizeplottedonlogarithmicscale
175.Increaseinfinenessmodulusofaggregateindicates
a)
finergrading
b)
coarsergrading
c)
gapgrading
d)
noneoftheabove
176.Weightofanovendrysandandairdrysandare500gmand520gmrespectively.
Iftheweightofthesamesandundersaturatedbutsurfacedryconditionis525gms,thenthe
waterabsorptionofsandis
a)
1%
b)
4%
c)
4.76%
d)
5%
177.SoundnesstestofcementbyLeChatelier'sapparatusgivesunsoundnessdueto
a)
freelimeonly
b)
magnesiaonly
c)
bothfreelimeandmagnesia
d)
noneoftheabove
178.MaximumpermissiblelimitofmagnesiacontentinordinaryPortlandcementis
a)
4%
b)
6%
c)
8%
d)
10%
3comments:
sidhuon13October2013at04:28said...
above150answerarenotdisplayed
umaralion23October2013at11:04said...
impressivequestions
AjayKumaron9December2013at21:02said...
plzprovideanswersofquestionfrom150178........plzplzplz....andthanksalot
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