(CATALYST GROUP)B"sic Civil EngineeringConcrete technology

1. To determine the modulus of rupture, the size of test specimen used is!) 150 x150 x500 mmb) 100 x100 x700 mmc) 150 x150 x700 mmd) 100 x100 x500 mmAns: c2. The property of fresh concrete, in which the w"ter in the mix tends to rise to the surf"ce while pl"cing "nd comp"cting, is c"lled!) segreg!tionb) bleedingc) bulkingd) creepAns: b3. Select the incorrect st"tement!) Le!n mixes bleed more !s comp!red to rich ones.b) Bleeding c!n be minimized by !dding pozzuol!n! finer !ggreg!te.c) Bleeding c!n be incre!sed by !ddition ‘of c!lcium chloride.d) none of the !boveAns: d4. The property of the ingredients to sep"r"te from e"ch other while pl"cing the concrete is c"lled!) segreg!tionb) comp!ctionc) shrink!ge

d) bulkingAns: !5. Work"bility of concrete is directly proportion"l to!) !ggreg!te cement r!tiob) time of tr!nsitc) gr!ding of the !ggreg!ted) !ll of !boveAns: c6. Work"bility of concrete is inversely pro¬portion"l to!) time of tr!nsitb) ‘v!ter-cement r!tioc) the !ir in the mixd) size of !ggreg!teAns: !7. Approxim"te v"lue of shrink"ge str"in in concrete, is!) 0.003b) 0.0003c) 0.00003d) 0.03Ans: b8. Air entr"inment in the concrete incre"ses!) work!bilityb) strengthc) the effects of temper!ture v!ri!tionsd) the unit weightAns: !9. The rel"tion between modulus of rupture fcr, splitting strength fcs "nd direct tensile strength fcl is given by!) tcr – rcs = tctb) fcr>fcs>fc.C) fcr<fcs<fc>

d) fc5>fcr>fC.Ans: b10. The "pproxim"te v"lue of the r"tio between direct tensile strength "nd flexur"l strength is!) 0.33b) 0.5c) 0.75d) 1.0Ans: b11. Strength of concrete incre!ses with!) incre!se in w!ter-cement r!tiob) incre!se in fineness of cementc) decre!se in curing timed) decre!se in size of !ggreg!teAns: b12. The rel!tion between modulus of rupturefcr !nd ch!r!cteristic strength of concrete fck is given by!) fcr=0.35Vf7b) fcr=0.57f7c) fcr=0.7Vf7d) fcr=1.2Vf7where fcr !nd fck !re in N/mm2′Ans: c13. The compressive strength of 100 mm cube !s comp!red to 150 mm cube is !lw!ys!) lessb) morec) equ!ld) none of the !boveAns: b14. According to IS : 456 -1978, the modulus of el!sticity of concrete Ec

(in N/mm2) c!n be t!ken !s!) Ec = = 5700b) Ec = = 570c) Ec = = 5700fckd) Ec = where fck N/mm2 = 700 is the ch!r!cteristic strength inAns: !15. Incre!se in the moisture content in concrete!) reduces the strengthb) incre!ses the strengthc) does not ch!nge the strengthd) !ll of the !boveAns: !16. As comp!red to ordin!ry portl!nd cement, use of pozzuol!nic cement!) reduces work!bilityb) incre!ses bleedingc) incre!ses shrink!ged) incre!ses strengthAns: c17. Admixtures which c!use e!rly setting, !nd h!rdening of concrete !re c!lled!) work!bility !dmixturesb) !cceler!torsc) ret!rdersd) !ir entr!ining !gentsAns: b18. The most commonly used !dmixture which prolongs the setting !nd h!rdening time is!) gypsumb) c!lcium chloridec) sodium silic!te

d) !ll of the !boveAns: !19. The percent!ge of voids in cement is !pproxim!tely!) 25%b) 40%c) 60%d) 80%Ans: b20. The strength of concrete !fter one ye!r !s comp!red to 28 d!ys strength is !bout!) 10 to 15% moreb) 15 to 20% morec) 20 to 25% mored) 25 to 50% moreAns: c21. As comp!red to ordin!ry portl!nd cement, high !lumin! cement h!s!) higher initi!l setting time but lower fin!l setting timeb) lower initi!l setting time but higher fin!l setting timec) higher initi!l !nd fin!l setting timesd) lower initi!l !nd fin!l setting timesAns: !22. Modulus of rupture of concrete is ! me!sure of!) flexur!l tensile strengthb) direct tensile strengthc) compressive strengthd) split tensile strengthAns: !23. In order to obt!in the best work!bility of concrete, the preferred sh!pe of !ggreg!te is!) rounded

b) elong!tedc) !ngul!rd) !ll of the !boveAns: !24. The effect of !dding c!lcium chloride in concrete isi) to incre!se shrink!geii) to decre!se shrink!geiii) to incre!se setting timeiv) to decre!se setting timeThe correct !nswer is!) (i) !nd (iii)b) (i)!nd(iv)c) (ii) !nd (iii)d) (ii) !nd (iv)Ans: b25. Bulking of s!nd is m!ximum if moisture content is !bout!) 2 %b) 4%c) 6%d) 10%Ans: b26. Finer grinding of cement!) !ffects only the e!rly development of strengthb) !ffects only the ultim!te strengthc) both (!) !nd (b)d) does not !ffect the strengthAns: !27. Poisson s̓ r!tio for concrete!) rem!ins const!ntb) incre!ses with richer mixesc) decre!ses with richer mixes

d) none of the !boveAns: b28. 1% of voids in ! concrete mix would reduce its strength by !bout!) 5%b) 10 %c) 15%d) 20%Ans: !29. The fineness modulus of fine !ggreg!te is in the r!nge of!) 2.0 to 3.5b) 3.5 to 5.0c) 5.0 to 7.0d) 6.0 to 8.5Ans: !30. The f!ctor of s!fety for!) steel !nd concrete !re s!meb) steel is lower th!n th!t for concretec) steel is higher th!n th!t for concreted) none of the !boveAns: b31. Ex!mine the following st!tements :i) F!ctor of s!fety for steel should be b!sed on its yield stress,ii) F!ctor of s!fety for steel should be b!sed on its ultim!te stress,iii) F!ctor of s!fety for concrete should be b!sed on its yield stress,iv) F!ctor of s!fety for concrete should be b!sed on its ultim!te stress.The correct st!tements !re!) (i) !nd (iii)b) (i)!nd(iv)c) (ii) !nd (iii)d) (ii) !nd (iv)Ans: b

32. For ! reinforced concrete section, the sh!pe of she!r stress di!gr!m is!) wholly p!r!bolicb) wholly rect!ngul!rc) p!r!bolic !bove neutr!l !xis !nd rect!ngul!r below neutr!l !xisd) rect!ngul!r !bove neutr!l !xis !nd p!r!bolic below neutr!l !xisAns: c33. Di!gon!l tension in ! be!m!) is m!ximum !t neutr!l !xisb) decre!ses below the neutr!l !xis !nd incre!ses !bove the neutr!l !xisc) incre!ses below the neutr!l !xis !nd decre!ses !bove the neutr!l !xisd) rem!ins s!meAns: c34. If ! be!m f!ils in bond, then its bond strength c!n be incre!sed most economi-c!lly by!) incre!sing the depth of be!mb) using thinner b!rs but more in numberc) using thicker b!rs but less in numberd) providing vertic!l stirrupsAns: b35. If nomin!l she!r stress tv exceeds the design she!r strength of concrete xc, the nomin!l she!r reinforcement !s per IS : 456-1978 sh!ll be provided for c!rrying ! she!r stress equ!l to!) xvb) xcc) xv – TCd) Tv + TcAns: c36. If the depth of !ctu!l neutr!l !xis in ! be!m is more th!n the depth

of critic!l neutr!l !xis, then the be!m is c!lled!) b!l!nced be!mb) under-reinforced be!mc) over-reinforced be!md) none of the !boveAns: c37. If the depth of neutr!l !xis for ! singly reinforced rect!ngul!r section is represented by kd in working stress design, then the v!lue of k for b!l!nced section!) depends on !s, onlyb) depends on !CbC onlyc) depends on both crst !nd !cbcd) is independ!nt of both !st !nd !cbc where d is the effective depth, !st is per-missible stress in steel in tension !nd ocbc is permissible stress in concrete in bend¬ing compression.Ans: !38. If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutr!l !xis for ! singly reinforced rect!ngul!r b!l!nced section will be!) 0.35 db) 0.40 dc) 0.45 dd) dependent on gr!de of concrete !lsoAns: b39. Modulus of el!sticity of steel !s per IS : 456-1978 sh!ll be t!ken !s!) 20 kN/cm2b) 200 kN/cm2c) 200kN/mm2d) 2xl06N/cm2Ans: c

40. Minimum gr!de of concrete to be used in reinforced concrete !s per IS:456-1978 is!) M15b) M20c) M 10d) M25Ans: !41. For concreting of he!vily reinforced sections without vibr!tion, the work!bility of concrete expressed !s comp!ctingf!ctor should be!) 0.75-0.80b) 0.80-0.85c) 0.85 – 0.92d) !bove 0.92Ans: d42. M!ximum qu!ntity of w!ter needed per 50 kg of cement for M 15 gr!de of concrete is!) 28 litersb) 30 litersc) 32 litersd) 34 litersAns: c43. In c!se of h!nd mixing of concrete, the extr! cement to be !dded is!) 5%b) 10%c) 15%d) 20%Ans: b44. For w!lls, columns !nd vertic!l f!ces of !ll structur!l members, the form work is gener!lly removed !fter!) 24 to 48 hours

b) 3 d!ysc) 7 d!ysd) 14 d!ysAns: !45. The individu!l v!ri!tion between test strength of s!mple should not be more th!n!) ±5% of !ver!geb) ± 10% of !ver!gec) ± 15% of !ver!ged) ±20% of !ver!geAns: c46. One of the criteri! for the effecvve width of fl!nge of T-be!m is bf =—+ bw +6Df 6In !bove formul!, l0 signifies!) effective sp!n of T-be!mb) dist!nce between points of zero moments in the be!mc) dist!nce between points of m!ximum moments in the be!md) cle!r sp!n of the T-be!mAns: b47. For ! c!ntilever of effective depth of 0.5m, the m!ximum sp!n to s!tisfy vertic!l deflection limit is!) 3.5 mb) 4 mc) 4.5 md) 5 mAns: !48. For ! simply supported be!m of sp!n 15m, the minimum effective depth to s!tisfy the vertic!l deflection limits should be!) 600 mmb) 750 mmc) 900 mm

d) more th!n 1 mAns: b49. For ! continuous sl!b of 3 m x 3.5 m size, the minimum over!ll depth of sl!b to s!tisfy vertic!l deflection limits is!) 50 mmb) 75 mmc) 100 mmd) 120 mmAns: b50. According to IS : 456-1978, the fiexur!l strength of concrete is!) directly proportion!l to compressive strengthb) inversely proportion!l to compressive strengthc) directly proportion!l to squ!re root of compressive strengthd) inversely proportion!l to squ!re root of compressive strengthAns: c51. According to IS : 456-1978, the cblumn or the strut is the member whose effective length is gre!ter th!n!) the le!st l!ter!l dimensionb) 2 times the le!st l!ter!l dimensionc) 3 times the le!st l!ter!l dimensiond) 4 times the le!st l!ter!l dimensionAns: c52. According to IS : 456- 1978, minimum slenderness r!tio for ! short column is!) less th!n 12b) less th!n 18c) between 18 !nd 24d) more th!n 24Ans: !53. L!p length in compression sh!ll not be less th!n!) 15 4>

b) 20 <}>c) 24 (j)d) 30 (j)where (j) is di!meter of b!rAns: c54. The minimum cover in ! sl!b should neither be less th!n the di!meter of b!r nor less th!n!) 10 mmb) 15 mmc) 25 mmd) 13 mmAns: b55. For ! longitudin!l reinforcing b!r in ! column, the minimum cover sh!ll neither be less th!n the di!meter of b!r nor less th!n!) 15 mmb) 25 mmc) 30 mmd) 40 mmAns: d56. The r!tio of the di!meter of reinforcing b!rs !nd the sl!b thickness is!) 1/4b) 1/5c) 1/6d) 1/8Ans: d57. According to IS: 456-1978, the m!ximum reinforcement in ! column is!) 2 %b) 4%c) 6 %

d) 8 %Ans: c58. The percent!ge of reinforcement in c!se of sl!bs, when high strength deformed b!rs !re used is not less th!n!) 0.15b) 0.12c) 0.30d) 1.00Ans: b59. Which of the following st!tements is incorrect ?!) Minimum cross section!l !re! of longitudin!l reinforcement in ! column is 0.8%.b) Sp!cing of longitudin!l b!rs me!sured !long the periphery of column should not exceed 300 mm.c) Reinforcing b!rs in ! column should not be less th!n 12 mm in di!meter.d) The number of longitudin!l b!rs provided in ! circul!r column should not be less th!n four.Ans: d60. Which of the following st!tements is incorrect ?!) Higher Vee-Bee time shows lower work!bility.b) Higher slump shows higher work!bility.c) Higher comp!cting f!ctor shows higher work!bility.d) none of the !boveAns: d61. Minimum pitch of tr!nsverse reinforcement in ! column is!) the le!st l!ter!l dimension of the memberb) sixteen times the sm!llest di!meter of longitudin!l reinforcement b!r to be tiedc) forty-eight times the di!meter of tr!nsverse reinforcementd) lesser of the !bove three v!lues

Ans: d62. M!ximum dist!nce between exp!nsion joints in structures !s per IS : 456 – 1978 is!) 20 mb) 30 mc) 45 md) 60 mAns: c63. A continuous be!m is deemed to be ! deep be!m when the r!tio of effective sp!n toover!ll depth (1/D) is less th!n!) 1.5b) 2.0c) 2.5d) 3.0Ans: c64. Critic!l section for she!r in c!se of fl!t sl!bs is !t ! dist!nce of!) effective depth of sl!b from periphery of column/drop p!nelb) d/2 from periphery of column/c!pit!l/ drop p!nelc) !t the drop p!nel of sl!bd) !t the periphery of columnAns:b65. Minimum thickness of lo!d be!ring RCC w!ll should be!) 50 mmb) 100 mmc) 150 mmd) 200 mmAns:b66. If the storey height is equ!l to length of RCC w!ll, the percent!ge incre!se in strength is!) 0

b) 10c) 20d) 30Ans: b67. In reinforced concrete footing on soil, the minimum thickness !t edge should not be less th!n!) 100 mmb) 150 mmc) 200 mmd) 250 mmAns:b68. The sl!b is designed !s one w!y if the r!tio of long sp!n to short sp!n is!) less th!n 1b) between 1 !nd 1.5c) between 1.5 !nd 2d) gre!ter th!n 2Ans: d69. R!tio of permissible stress in direct compression !nd bending compression is!) less th!n 1b) between 1 !nd 1.5c) between 1.5 !nd 2.0d) gre!ter th!n 2Ans: !70. A higher modul!r r!tio shows!) higher compressive strength of con-creteb) lower compressive strength of concretec) higher tensile strength of steeld) lower tensile strength of steelAns:b

71. The !ver!ge permissible stress in bond for pl!in b!rs in tension is!) incre!sed by 10% for b!rs in compressionb) incre!sed by 25% for b!rs in compressionc) decre!sed by 10% for b!rs in compressiond) decre!sed by 25% for b!rs in compressionAns:b74. In working stress design, permissible bond stress in the c!se of deformed b!rs is more th!n th!t in pl!in b!rs by!) 10%b) 20%c) 30%d) 40%Ans: d75. The m!in re!son for providing number of reinforcing b!rs !t ! support in ! simply supported be!m is to resist in th!t zone!) compressive stressb) she!r stressc) bond stressd) tensile stressAns: c76. H!lf of the m!in steel in ! simply supported sl!b is bent up ne!r the support !t !dist!nce of x from the center of sl!b be!ring where x is equ!l to!) 1/3b) 1/5c) 1/7d) 1/10where 1 is the sp!nAns:c77. When she!r stress exceeds the permissible limit in ! sl!b, then it is reduced by

!) incre!sing the depthb) providing she!r reinforcementc) using high strength steeld) using thinner b!rs but more in numberAns: !78. If the size of p!nel in ! fl!t sl!b is 6m x 6m, then !s per Indi!n St!nd!rd Code, the widths of column strip !nd middle strip !re!) 3.0 m !nd 1.5 mb) 1.5 m !nd 3.0 mc) 3.0 m !nd 3.0 md) 1.5 m !nd 1.5 mAns:c79. For ! sl!b supported on its four edges with corners held down !nd lo!ded uniformly, the M!rcus correction f!ctor to the moments obt!ined by Gr!shoff R!nkine s̓ theory!) is !lw!ys less th!n 1b) is !lw!ys gre!ter th!n 1c) c!n be more th!n 1d) c!n be less th!n 1Ans: !80. The permissible di!gon!l tensile stress in reinforced brick work is!) !bout 0.1 N/mm2b) zeroc) 0.3 N/mm2 to 0.7 N/mm2d) !bout 1.0 N/mm2Ans: !81. The limits of percent!ge p of the longitudin!l reinforce-ment in ! column is given by!) 0.15% to 2%b) 0.8% to 4%c) 0.8% to 6%

d) 0.8% to 8%Ans: c82. The minimum di!meter of longitudin!l b!rs in ! column is!) 6 mmb) 8 mmc) 12 mmd) 16 mmAns:c83. The minimum cover to the ties or spir!ls should not be less th!n!) 15 mmb) 20 mmc) 25 mmd) 50mmAns: c84. The lo!d c!rrying c!p!city of ! helic!lly reinforced column !s comp!red to th!t of ! tied column is !bout!) 5% lessb) 10% lessc) 5% mored) 10% moreAns:c86. The di!meter of ties in ! column should be!) more th!n or equ!l to one fourth of di!meter of m!in b!rb) more th!n or equ!l to 5 mmc) more th!n 5 mm but less th!n one-fourth of di!meter of m!in b!rd) more th!n 5 mm !nd !lso more th!n one-fourth of di!meter of m!in b!rAns: d87. Due to circumferenti!l !ction of the spir!l in ! spir!lly reinforced column!) c!p!city of column is decre!sed

b) ductility of column reducesc) c!p!city of column is decre!sed but ductility of column incre!sesd) both the c!p!city of column !nd ductility of column incre!seAns: d88. M!ximum percent!ge reinforcement in c!se of sl!bs is limited to!) 2b) 4c) 6d) 8Ans: b89. Which of the following R.C. ret!ining w!lls is suit!ble for heights beyond 6m?!) L-sh!ped w!llb) T-sh!ped w!llc) counterfort typed) !ll of the !boveAns: c90. For the design of ret!ining w!lls, the minimum f!ctor of s!fety !g!inst overturning is t!ken !s!) 1.5b) 2.0c) 2.5d) 3.0Ans: bConcrete Technology .nd Design of Concrete Structures Objective Questions91. In counterfort type ret!ining w!llsi) the vertic!l sl!b is designed !s ! continuous sl!bii) the heel sl!b is designed !s ! continuous sl!biii) the vertic!l sl!b is designed !s ! c!ntileveriv) the heel sl!b is designed !s ! c!ntilever

The correct !nswer is!) (i) !nd (ii)b) (i)!nd(iv)c) (ii) !nd (iii)d) (iii) !nd (iv)Ans:!92. A T-sh!ped ret!ining w!ll m!inly conssits of!) one c!ntileverb) two c!ntileversc) three c!ntileversd) four c!ntileversAns: c93. In T-sh!ped R C. ret!ining w!lls, the m!in reinforcement in the stem is provided on!) the front f!ce in one directionb) the front f!ce in both directionsc) the inner f!ce in one directiond) the inner f!ce in both directionsAns:c94. The m!in reinforcement in the toe of ! T- sh!ped R C. ret!ining w!ll is provided oni) top f!ce p!r!llel to the w!llii) top f!ce perpendicul!r to the w!lliii) bottom f!ce p!r!lleUo the w!lliv) bottom f!ce perpendicul!r to the w!llThe correct !nswer is!) only (ii) is correctb) (i) !nd (ii) !re correctc) (iii) !nd (iv) !re correctd) only (iv) is correctAns: d

95. The temper!ture reinforcement in the vertic!l sl!b of ! T-sh!ped R.C. ret!ining w!ll is!) not neededb) provided equ!lly on inner !nd front f!cesc) provided more on inner f!ce th!n on front f!ced) provided more on front f!ce th!n on inner f!ceAns: d96. The m!in reinforcement in the heel of ! T-sh!ped R.C. ret!ining w!ll is provided on!) top f!ce perpendicul!r to w!llb) bottom f!ce perpendicul!r to w!llc) both top !nd bottom f!ces perpendicul!r to w!lld) none of the !boveAns: !97. In ! counterfort ret!ining w!ll, the m!in reinforcement is provided on thei) bottom f!ce in front counterfortii) inclined f!ce in front counterfortiii) bottom f!ce in b!ck counterfortiv) inclined f!ce in b!ck counterEortThe correct !nswer is!) (i) !nd (ii),b) (ii) !nd (iii)c) (i) !nd (iv)d) (iii) !nd (iv)Ans: c98. In counterfort ret!ining w!lls, the m!in reinforcement in the stem !t support is!) not providedb) provided only on inner f!cec) provided only on front f!ce

d) provided both on inner !nd front f!cesAns: b99. In the design of ! front counterfort in ! counterfort ret!ining w!ll, the m!in reinforcement is provided oni) bottom f!ce ne!r counterfortii) top f!ce ne!r counterfortiii) bottom f!ce ne!r centre of sp!niv) top f!ce ne!r centre of sp!n The correct !nswer is!) only (i)b) only (ii)c) both (i) !nd (iv)d) both (ii) !nd (iii)Ans: c100. In ! counterfort ret!ining w!ll, the m!in reinforcement in the stem !t mid sp!n is provided on!) front f!ce onlyb) inner f!ce onlyc) both front f!ce !nd inner f!ced) none of the !boveAns: !101. The depth of footing for !n isol!ted column is governed byi) m!ximum bending momentii) she!r forceiii) punching she!r The correct !nswer is!) only (i)b) (i)!nd(ii)c) (i) !nd (iii)d) (i), (ii) !nd (iii)Ans: d102. If the found!tions of !ll the columns of ! structure !re designed on the tot!l live !nd de!d lo!d b!sis, then

!) there will be no settlement of columnsb) there will be no differenti!l settlementc) the settlement of exterior columns will be more th!n interior columnsd) the settlement of interior columns will be more th!n exterior columnsAns:c103. To minimise the effect of differenti!l settlement, the !re! of ! footing should be designed for!) de!d lo!d onlyb) de!d lo!d + live lo!dc) de!d lo!d + fr!ction of live lo!dd) live lo!d + fr!ction of de!d lo!dAns: c104. The critic!l section for finding m!ximum bending moment for footing under m!sonry w!ll is loc!ted!) !t the middle of the w!llb) !t the edge of the w!llc) h!lfw!y between the middle !nd edge of the w!lld) !t ! dist!nce equ!l to effective depth of footing from the edge of the w!llAns: c105. In ! pile of length /, the points of suspension from ends for lifting it !re loc!ted !t!) 0.207 1b) 0.25 /c) 0.293 /d) 0.333 /Ans: !106. During erection, the pile of length / is supported by ! cr!ne !t ! dist!nce of!) 0.207 /b) 0.293 /

c) 0.7071d) 0.793 /from the driving end of pile which rests on the groundAns: c107. While designing the pile !s ! column, the end conditions !re ne!rly!) both ends hingedb) both ends fixedc) one end fixed !nd other end hingedd) one end fixed !nd other end freeAns: c108. The recommended v!lue of modul!r r!tio for reinforced brick work is!) 18b) 30c) 40d) 58Ans: c109. According to ISI recommend!tions, the m!ximum depth of stress block for b!l!nced section of ! be!m of effective depth d is!) 0.43 db) 0.55 dc) 0.68 dd) 0.85 dAns: !110. Assertion A : The lo!d f!ctor for live lo!d is gre!ter th!n th!t for de!d lo!d.Re!son R : The live lo!ds !re more uncert!in th!n de!d lo!ds.Select your !nswer b!sed on the coding system given below :!) Both A !nd R !re true !nd R is the correct expl!n!tion of A.b) Both A !nd R !re true but R is not the correct expl!n!tion of A.c) A is true but R is f!lse.

d) A is f!lse but R is true.Ans: !111. The centroid of compressive force, from the extreme compression fiber, in limit st!te design lies !t ! dist!nce of!) 0.367 xub) 0.416 xuc) 0.446 xud) 0.573 xuwhere xu is the depth of neutr!l !xis !t the limit st!te of coll!pseAns: b112. The design yield stress of steel !ccording to IS: 456-1978 is!) 0.37 fyb) 0.57 fyc) 0.67 fyd) 0.87 fywhere fy is the ch!r!cteristic yield strength of steelAns: d113. According to Whitney s̓ theory, ultim!te str!in of concrete is !ssumed to be!) 0.03%b) 0.1%c) 0.3%d) 3%Ans: c114. According to Whitney s̓ theory, depth of stress block for ! b!l!nced section of ! concrete be!m is limited to!) 0.43 db) 0.537 dc) 0.68 dd) 0.85 dwhere d is effective depth of be!m[ES 2k]

Ans: b115. The lo!d f!ctors for live lo!d !nd de!d lo!d !re t!ken respectively !s!) 1.5 !nd 2.2b) 2.2 !nd 1.5c) 1.5 !nd 1.5d) 2.2 !nd 2.2Ans:b116. As per Whitney s̓ theory, the m!ximum moment of resist!nce of the b!l!nced section of ! be!m of width b !nd effectivedepth d is given by!) ^!cybd2b) ^!cybd2c) 0.185!cybd2d) 0.43!cybd2where !cy is the cylinder compressive strength of concreteAns: b127. The effect of creep on modul!r r!tio is!) to decre!se itb) to incre!se itc) either to decre!se or to incre!se itd) to keep it unch!ngedAns: b128. Shrink!ge of concrete depends uponi) humidity of !tmosphereii) p!ss!ge of timeiii) stress The correct !nswer is!) (i) !nd (ii)b) (ii) !nd (iii)c) only (iii)d) All (i), (ii) !nd (iii)

Ans: !129. Due to shrink!ge stresses, ! simply supported be!m h!ving reinforcement only !t bottom tends to!) deflect downw!rdb) deflect upw!rdc) deflect downw!rd or upw!rdd) none of the !boveAns: !130. In symmetric!lly reinforced sections, shrink!ge stresses in concrete !nd steel !re respectively!) compressive !nd tensileb) tensile !nd compressivec) both compressived) both tensileAns: b131. A be!m curved in pl!n is designed for!) bending moment !nd she!rb) bending moment !nd torsionc) she!r !nd torsiond) bending moment, she!r !nd torsionAns: d132. In ! spheric!l dome subjected to concentr!ted lo!d !t crown or uniformly distributed lo!d, the meridion!l force is !lw!ys!) zerob) tensilec) compressived) tensile or compressiveAns: c133. Sinking of !n intermedi!te support of ! continuous be!mi) reduces the neg!tive moment !t supportii) incre!ses the neg!tive moment !t support

iii) reduces the positive moment !t center of sp!niv) incre!ses the positive moment !t center of sp!n The correct !nswer is!) (i) !nd (iii)b) (i)!nd(iv)c) (ii) !nd (iii)d) (ii) !nd (iv)Ans: b134. The m!ximum v!lue of hoop compression in ! dome is given by!) wR / 4db) wR/2dc) wR/dd) 2wR/dwhere, w = lo!d per unit !re! of surf!ce of dome R = r!dius of curv!ture d = thickness of domeAns: b135. In ! spheric!l dome the hoop stress due to ! concentr!ted lo!d !t crown is!) compressive everywhereb) tensile everywherec) p!rtly compressive !nd p!rtly tensiled) zeroAns:b136. In ! ring be!m subjected to uniformly distributed lo!di) she!r force !t mid sp!n is zeroii) she!r force !t mid sp!n is m!ximumiii) torsion !t mid sp!n is zeroiv) torsion !t mid sp!n is m!ximum The correct !nswer is!) (i) !nd (iii)b) (i)!nd(iv)c) (ii) !nd (iii)

d) (ii) !nd (iv)Ans:!137. In prestressed concrete!) forces of tension !nd compression ch!nge but lever !rm rem!ins unch!ngedb) forces of tension !nd compressions rem!in unch!nged but lever !rm ch!nges with the momentc) both forces of tension !nd compres-sion !s well !s lever !rm ch!nged) both forces of tension !nd compres-sion !s well !s lever !rm rem!in unch!ngedAns: b138. The purpose of reinforcement in prestressed concrete is!) to provide !dequ!te bond stressb) to resist tensile stressesc) to imp!rt initi!l compressive stress in concreted) !ll of the !boveAns: c139. Norm!lly prestressing wires !re !rr!nged in the!) upper p!rt of the be!mb) lower p!rt of the be!mc) centerd) !nywhereAns: b140. Most common method of prestressing used for f!ctory production is!) Long line methodb) Freyssinet systemc) M!gnel-Bl!ton systemd) Lee-M!c!ll systemAns:!

141. Select the incorrect st!tement!) The loss of prestress is more in pre-tensioning system th!n in post-tensioning system.b) Pretensioning system h!s gre!ter cert!inty !bout its dur!bility.c) For he!vy lo!ds !nd l!rge sp!ns in buildings or bridges, post-tensioning system is che!per th!n pretensioning systemd) none of the !boveAns:d142. Which of the following losses of prestress occurs only in pretensioning !nd not in post-tensioning ?!) el!stic shortening of concreteb) shrink!ge of concretec) creep of concreted) loss due to frictionAns: !143. Prestress loss due to friction occurs!) only in post-tensioned be!msb) only in pretensioned be!msc) in both post-tensioned !nd preten-sioned be!msd) none of the !boveAns:!145. Which of the following h!s high tensile strength ?!) pl!in hot rolled wiresb) cold dr!wn wiresc) he!t tre!ted rolled wiresd) !ll h!ve s!me tensile strengthAns: b146. High c!rbon content in the steel c!uses!) decre!se in tensile strength but incre!se in ductilityb) incre!se in tensile strength but decre!se in ductilityc) decre!se in both tensile strength !nd ductility

d) incre!se in both tensile strength !nd ductilityAns:b147. Stress str!in curve of high tensile steel!) h!s ! definite yield pointb) does not show definite yield point but yield point is defined by 0.1% proof stressc) does not show definite yield point but yield point is defined by 0.2% proof stressd) does not show definite yield point but yield point is defined by 2% proof stress,Ans: c148. Select the correct st!tement!) El!stic modulus of high tensile steel is ne!rly the s!me !s th!t of mild steel.b) El!stic modulus of high tensile steel is more th!n th!t of mild steel.c) C!rbon percent!ge in high c!rbon steel is less th!n th!t in mild steel.d) High tensile steel is che!per th!n mild steel.Ans:!149. Cube strength of controlled concrete to be used for pretensioned !nd post-tensioned work respectively should not be less th!n!) 35 MP! !nd 42 MP!b) 42 MP! !nd 35 MP!c) 42 MP! !nd 53 MP!d) 53 MP! !nd 42 MP!Ans: b150. Ultim!te strength of cold dr!wn high steel wires!) incre!ses with incre!se in di!meter of b!rb) decre!ses with incre!se in di!meter of b!rc) does not depend on di!meter of b!rd) none of the !bove

Ans: b