Structural Designand Drawing III Big MCQ collection

Multiple Choice Questions 249 Pages

Savitribai Phule Pune University

Civil Engineering

Contributed by

Prajwal Hallale

AmrutvahiniCollegeofEngineering,Sangamner
DepartmentofCivilEngineering
MULTIPLECHOICEQUESTIONS
Subject:StructuralDesignandDrawingIII
Unit–6(Structuralvibrationsandseismicforcecalculations)
OnemarksQuestions
Q.1WhichIScodeisusedfordesigningofastructuresconsideringearthquake
loads.
a)IS800
b)IS875
c)IS1893
d)IS456
Answer:c.
Q.2Forearthquakeloads,axiallyloadedmembershavetoresists______
a)Tensiononly
b)Compressiononly
c)Tensionandcompression
d)Bendingmoment
Answer:d.
Q.3Whichofthefollowingfactorsdoesnotinfluenceearthquakeresistancedesign?
a)Geographicallocationofstructure
b)Windoflocation
c)Sitesoil.
d)Strengthofstructure.
Answer:b.
Q.4Whichanalysisisusedtoobtaindesignseismicforce?
a)Elasticanalysis
b)Plasticanalysis
c)Dynamicanalysis
d)Bothelasticandplasticanalysis.
Answer:c.
Q.5 Which ofthe following relation is correctfordesign horizontalseismic
coefficient?
Page 1
a)A
h
=
b)A
h
=
c)A
h
=
d)A
h
=
Answer:b.
Q.6SpecialmomentresistingRCframemeansthatframewhichhasdesignin
accordancewithIScode.
a)IS1893
b)IS456
c)IS3370
d)IS13920.
Answer:d.
Q.7AsperIS1893:2016(PartI),theseismiczonefactorforAurangabadcityis
a)II:0.10
b)III:0.16
c)IV:0.24
d)IV:0.36
Answer:a.
Q.8AsperIS1893:2016(PartI),Theresponsereductionfactorforloadbearing
unreinforcedmasonrybuildingwithouthorizontalRCbandis
a)3.0
b)2.0
c)1.5
d)4.0
Answer:c.
Q.9Inreinforcedconcretebuildingthefloorisdesignedtocarryaimposedloadof
magnitude 3.5 kN/m
2
,whatpercentageofimposed load to beconsidered in
calculationofseismicweight?
a)0%.
Page 2
b)25%
c)50%
d)100%
Answer:c.
Q.10InequivalentstaticmethodofIS1893:2016,theapproximatefundamentaltime
periodTaofbaresteelmomentresistingframewithoutanymasonrywallinsecond
shallbeestimatedbyusingexpression
a)
b)
c)
d)
Answer:d.
Q.11Theratioofactualdampingtothecriticaldampingcoefficientiscalledas
a)Dampingconstant(C)
b)Dampingratio()
c)Effectivemass(m)
d)frequencyratio(fr)
Answer:b.
Q.12Asingledegreeoffreedom (SDOF)system consistsofmass20kgandspring
stiffness2200N/m.Thefundamentaltimeperiodinsecondisobtainedas
a)0.0598sec
b)0.123sec
c)0.598sec
d)0.0953sec.
Answer:c.
Q.13
n
isthenaturalfrequencyofthesysteminrad/sec,Whatistheexpressionfor
cyclicfrequency(f
n
)inHertz?
a)f
n
=
n
/2
b)f
n
=2/
n
c)f
n
=
n
*2
Page 3
d)f
n
=/
n.
Answer:a.
Q.14AsperdynamicequilibriumconditionandDAlembert’sprincipletheequationof
motioniswrittenas .
Theproductof iscalledas
a)Inertiaforce
b)Dampingforce
c)Elasticrestoringforce
d)Appliedforce.
Answer:a.
Q.15Thevibrationwhichpersistsinastructureaftercausingthemotionhasbeen
removedsuddenly,thecorrespondingvibrationiscalledas
a)forcedvibration
b)machinevibration
c)seismicvibration
d)freevibration
Answer:d.
Q.16Whichofthefollowingisnottheforcedvibration?
a)Machinedinducedvibration
b)Simpleharmonicmotionofpendulum
c)Seismicvibrationofbuilding
d)Dynamicwindforceoverstructure.
Answer:b.
Q.17Therationofnaturallogarithmicvalueoftwosuccessivepeakvaluesof
displacementsinfreevibrationisrepresentedas
a)Dampingratio()
b)Stiffnessratio(kr)
c)Logarithmicdecrement()
d)Frequencyratio(fr)
Answer:c.
Q.18Ablockofweight500Nissupportedbyaspringofstiffness100kN/m,the
criticaldampingcoefficientiscalculatedas
a)981000Ns/m
Page 4
b)0.2855Ns/m
c)9.0304Ns/m
d)44294.4Ns/m
Answer:d.
Q.19Thelateralstiffnessofbeamsubjectedtoselfweight‘w’atmidspanis
a)
b)
c)
d)
Answer:b.
Q.20Ifdampingconstantismorethancriticaldampingconstant,thenthesystemis
calledas
a)Overdampedsystem
b)Criticallydampedsystem
c)Underdampedsystem
d)Subdampedsystem.
Answer:a.
TwomarksQuestions
Q.1Baseshearinaresidentialbuildingis120kNandstoreyheightis4m asshown
inFigurebelow.Whatisthedesignlateralforceat3
rd
floorlevelasperIS1893:2016
(PartI)?
3m
3m
3m
3m
FirstFloor
SecondFloor
Third
FourthFloor
W
4
=120kN
W
3
=350kN
W
2
=350kN
W
1
=350kN
Page 5
a)33.782kN
b)24.633kN
c)55.425kN
d)6.158kN.
Answer:c.
Q.2InspecialRCmomentresistinghospitalbuilding,thetotalseismicweightis
20000kN.ThebuildingissituatedinzoneIVonmediumsoil.Thetotalheightofthe
buildingis13.5m andmaximum lateraldimensionis35m.Whatamountofdesign
baseshearforceisdevelopedinbuildingasperEquivalentStaticmethod?
a)2000kN
b)3000kN
c)1200kN.
d)1800kN.
Answer:d.
Q.3InunderdampedSDOFsystem subjectedtofreevibration,itisnotedthatthe
peakdisplacementinsecondcycleis0.15cmandtheviscousdampingratiois0.02.
Whatisthepeakdisplacementinsuccessivethirdcycle?
a)0.132cm
b)0.182cm
c)0.1cm
d)0.09cm.
Answer:a.
Q.4InundampedfreevibrationSDOFsystem,thetotalstiffnessis300kN/m and
massis1200kg.Theinitialdisplacementandvelocityis0.02m and0.8m/sec
respectively,calculatethedisplacementofsystemattime4second.
a)0.0543m
b)0.0386m
c)-0.0250m
d)-0.0523m
Answer:b.
Q.5Thesimplysupportedbeam isidealisedintoadampedSDOFsystem underfree
vibration.Thestiffnessofthesystem is45000N/m,massis1000kganddamping
dashpotconstantis2000Ns/m.Findthedampednaturalfrequencyofunderdamped
systeminrad/sec.
Page 6
a)6.708rad/sec
b)2.141rad/sec
c)6.633rad/sec
d)2.138rad/sec.
Answer:c.
Page 7
Page 1 of 5

JSPM’s

Imperial College of Engineering and Research, Wagholi, Pune.
(Approved by AICTE, Delhi & Govt. of Maharashtra, affiliated to SPPU, Pune)
Gat.No.720, Pune-Nagar road, Wagholi, Pune,412207.
Department of Civil Engineering
NAAC Accredited with “A” grade

B. E. (Civil)
Sample MCQs, Structural Design & Drawing
& Drawing-III

1
The phenomena of development of internal tensile stresses in a concrete member by means of
tensioning devices are called as
A. Pre-tensioning
B. Post-tensioning
C. Prestressing of
concrete
D. Thermoelectric
prestressing
2
End zone reinforcement in post-tensioning is provided to resist
A. Spalling force
B. Bursting force
C. Tensile stress
D. All of the above
3

The bursting stresses in prestressed concrete members are developed at
A.maximum bending
moment zone
B. maximum shear zone
C. anchorage zone
D. bond zone
4
The problem of excessive frictional losses can be tackled by reducing
A. Eccentricity
B. Prestressing force
C. Curvature
D. Loads
5
The method of prestressing the concrete after it attains its strength is known as ___________
A. Pre tensioning
B. Post tensioning
C. Chemical
prestressing
D. Axial prestressing
6.
In which method the prestress is developed due to the bond between the concrete and steel?
A. Pre tensioning
B. Post tensioning
C. Thermo electric
prestressing
D. Prefix beam
prestressing
7.
The length of the prestressing tendon between the end of the member and the point where the steel
attains its stress is called ___________
A. Anchorage
B. De bonding
C. Cracking load
D. Transmission
length
8.
The load at which the prestressed member develops its first crack is called as ___________
A. Transfer load
B. Creep load
C. Bending load
D. Cracking load

9.
The phenomena of drying process of contraction concrete refer to ___________
A. Moisture loss
B. Shrinkage of concrete
C. Drying process
D. Weight loss
10.
The ratio between the creep strain and elastic strain of concrete is defined as ___________
A. Creep ratio
B. Creep elasticity
C. Creep coefficient
D. Creep factor
11.
The phenomena of reduction of stress in steel at a constant strain are known as ___________
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Page 2 of 5

A. Reduction of stress
B. Relaxation of stress
C. De bonding
D. Proof stress
12.
A device which helps the tendons to transmit prestress to the member and maintain it for the design
period is
A. Cab cable
B. Anchorage
C. Tendon
D. Transfer
13.
Which of the following type of prestress applied to concrete in which tensile stresses to a limited
degree are permitted is known as ___________
A. Moderate
prestressing
B. Partial prestressing
C. Full prestressing
D. Axial prestressing
14.
. In post tensioning, the concrete units are cast by ___________
A. Ducts
B. Jacks
C. Anchorages
D. Wedges
15.
Which system of prestressing is widely used in India?
A. Gifford-Udall
B. Lee-McCall
C. Magnel-Balton
D. Freyssinet
16.
The development of crack widths is comparatively larger in ____________
A. Bonded beams
B. Un bonded beams
C. Localized beams
D. Strengthened
beams
17.
The resultant stresses in concrete at any section are obtained by the effect of ________
A. Prestress and
flexural stresses
B. Prestress and bending
stresses
C. Prestress and shear
stresses
D. Prestress and
torsion stresses
18.
The resultant stress distribution due to eccentric prestressing, dead and live loads at any given section
are obtained as ___________
A. f
sup
= (p/a
p
e
/z
t
)+(m
g
/z
t
)+(m
q
/z
t
)
B. f
sup
= (p/a-
p
e
/z
t
)+(m
g
/z
t
)+(m
q
/z
t
)
C.
fsup = (p/a-
pe/zt)+(mg/zt)+(mq/zt)

D.
fsup = (p/a-
pe/zt)+(mg/zt)+(mq/z
t)
19.
A concrete beam of rectangular section, 250mm wide and 600mm deep. Calculate the bending
moment that can be applied without applying tension at the soffit of the beam with given m/z value
as 5.74?
A. 26.4
B. 54.8
C. 34.5
D. 86.1
20.
A prestressed concrete beam of section 200mm wide by 300mm deep of imposed load 4kn/m at a
span of 6m, density of concrete is 24kn/m
3
. Find the concentric prestressing force necessary for zero
fiber stress at the soffit?
A. 490
B. 560
C. 230
D. 310
21.
Critical section for shear in case of flat slabs is at a distance of
A. effective depth of
slab from periphery of
column/drop panel
B. d/2 from periphery of
column/capital/ drop panel
C. at the drop panel of
slab
D. at the periphery of
column
22.
The locus of the points of application of resultant force in any structure is termed as ___________
A. Pressure line
B. Hollow line
C. Beam line
D. Tendon line
23.
The location of the pressure line depends upon ___________
A. Breakage and
Bondage
B. Magnitude and
direction
C. Shear and Torsion
D. Pressure and
equilibrium
24.
The shift of pressure line measured from centroidal axis is obtained as ___________
A. (m/p)-e
B. (m/q)-e
C. (m/r)-e
D. (m/i)-e
25.
A rectangular concrete beam of cross section 100mm wide and 400mm deep is prestressed by a
straight cable of span 6m, imposed load is 3.14kn/m, area is 36×10
3
mm
2
(Z=18×10
5
mm
3
). Calculate
Page 9
Page 3 of 5

working moment assuming the self weight of concrete as 24kn/m
3
?
A. 10.25
B. 2.25
C. 3.25
D. 4.25
26.
When the tensile stresses are developed in the cracks, they are visible at ____________
A. Hoop stress of
beams
B. Soffit of beams
C. Sagging of beams
D. Hogging of beams
27.
The cracks appear when the tensile stresses at the soffit are equal to ____________
A. Modulus of
elasticity
B. Modulus of rupture
C. Tension modulus
D. Reinforcement
modulus
28.
The loss of stress in steel due to elastic shortening or deformation is ____________
A. α
e
f
c

B. α
c
f
c

C. α
c
/f
c

D. α
e
/f
c

29.
A pretensioned concrete beam, 100mm wide and 300mm deep in prestressed by straight wires and
modulus of elasticity of steel and concrete are 210 and 35n/mm2. Find modular ratio?
A. 14
B. 7
C. 6
D. 10
30
The Indian standard code recommends a value for stress in wires varying from ____________
A. 0.5f
pu
to 0.8f
pu

B. 0.2f
pu
to 0.6f
pu

C. 0.4f
pu
to 0.10f
pu

D. 0.6f
pu
to 0.8f
pu

31
The Indian standard code provides relaxation loss for prestressing steels at a temperature of
____________
A. 27˚c
B. 30˚c
C. 40˚c
D. 50˚c
32
The term anchorage slip means ___________
A. Distance moved by
friction wedges
B. Radius by friction
wedges
C. Rotation by friction
wedges
D. Twisting
movement by friction
wedges
33
The amount of anchorage slip generally depends upon __________
A. Type of wedge
B. Type of tendon
C. Type of Cement
D. Type of anchor
34
A concrete beam is post tensioned by a cable carrying an initial stress of 1000n/mm
2
, the slip at the
jacking end was end was observed to be 5mm; modulus of elasticity of steel is 210kn/mm
2
. Estimate
the percentage loss of stress due to anchorage if length of beam is 30m?
A. 3.5%
B. 4.5%
C. 5.5%
D. 8.7%
35.
The value of creep coefficient ‘f’ depends upon ___________
A. Humidity
B.
C.
D.
36
The main function of retaining walls is
A. stabilize hillsides
B. Control erosion
C. to reduce the grades
of roads
D. all are correct
37
Gravity type retaining wall type is suitable for retaining backfill upto
A. 3-5 m
B. 5-8 m
C. 4 - 7 m
D. Any hight

38
A minimum factor of safety against sliding is recommended as
A.2
B. 1.5
C. 3
D. 2.5
39
Factor of safety against bearing pressure is recommended as
A.2
B. 2.5
C. 1.5
D. 3
40
Weep holes provided into retaining wall for the purpose of
A. to provide drainage
B. to prevent cracks due
to shrinkage
C. to avoid friction
behind the wall
D. to improve
appearance
Page 10

Structural Designand Drawing III Big MCQ collection

Structural Designand Drawing III Big MCQ collection

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