Miscellaneous MCQ's on RCC Beam Design Part-I

Miscellaneous MCQ's on RCC Beam Design Part-I

1) The most quantitative relation of span to depth of a slab simply supported and spanning in one direction, is

a) 35 b) 25 c) 30 d) 20 Ans:- Choice (d) 2) In a simply supported slab, alternate bars are curtailed at, a) 1/4th the span b) 1/5th the span c) 1/6th the span d) 1/7th the span Ans:- Choice (d) 3) An R.C.C beam of twenty five cm width has a clear span of five metres and carries a U.D.L. of twenty kN/m including of its self weight. If the effective depth of the section is forty five cm. 0.50% steel and M20 grade concrete is employed, the beam is a) Safe in shear b) Is safe with stirrups c) Is safe with stirrups and bent up bars d) Needs revision of the section Answer: Choice (a) 4) The minimum clear cover for R.C.C. beams shall be a) Greater of forty millimetre or diameter of large bar b) Smaller of forty millimetre or diameter of large bar c) Greater of 25mm or diameter of large bar d) Smaller of twenty five millimetre or diameter of largest bar Ans:- Choice (c) 5) A singly reinforced concrete beam of twenty-five cm wide and 70 cm deep (effective) is given 18.75 cm2 steel. If M15 grade concrete and fe415 steel is employed, the depth of the neutral axis is, a) 20cm b) 25cm c) 50cm d) 35cm Ans:- choice (c) 6) As per IS : 456, the reinforcement in a beam shouldn't exceed a) One Percent of cross-sectional area b) 1.5% of cross-sectional area c) 8% of cross-sectional area d) four-dimensional of cross-sectional area Answer: choice (d) 7) As per the steel beam theory of DR beams, a) Tension is resisted by tension steel b) Compression is resisted by compression steel c) Stress in tension steel equals the strain in compression steel d) All the above Ans:- choice (d) 8) Distribution of shear intensity over a rectangular section of a beam, follows: a) A circular curve b) A line c) A parabolic curve d) A elliptical curve Ans:- choice (c) 9) If the shear stress in a R.C.C. beam is a) Equal or less than allowable design shear stress in concrete, no shear reinforcement is needed b) Greater than allowable design shear stress in concrete, but less than maximum shear stress in concrete, shear reinforcement is provided c) Greater than maximum shear stress, the dimensions of the section is modified d) All the above Ans:- choice (d) 10) An R.C.C beam of twenty five cm wide & 40cm effective depth and carries a Shear force of sixty kN. If the safe shear stress is 0.44 N/mm2, the beam is a) Safe in shear b) Is safe with stirrups c) Is safe with stirrups and inclined bent up bars d) Needs revision of the section Answer: choice (b) 11) An under-reinforced section means that a) Steel is provided at the bottom only b) Steel provided is insufficient c) Steel provided on one face only d) Steel can yield initial Ans:- choice (d) 12) reinforced Cement Concrete has a) Good compressive stress (because of concrete). b) High tensile stress (because of steel). c) good resistance to wreck by fire and weathering d) All of these Ans:- choice (d) 13) The roles and responsibilities of structural engineers can be numerous and varied however generally include: a) Design & Investigation b) Communication & Due Diligence c) Both a & b d) Neither a nor b Ans:- choice (c) 14) The necessary properties of concrete, that govern the design of concrete mix are as follows a) Weight b) Compressive Strength c) Increase in strength with age d) All of these Ans:- choice (d) 15) To notice the tensile strength of concrete from compressive strength, the subsequent formula are often used a) Flexural strength, fcr=0.7√fck N/mm2 b) Flexural strength, fcr=0.5√fck N/mm2 c) Flexural strength, fcr=5000√fck N/mm2 d) Flexural strength, fcr=0.7xfck N/mm2 Ans:- choice (a) 16) The modulus of elasticity is generally associated with the compressive characteristic strength of concrete, and obtained as, a) Ec=5000√fck N/mm2 b) Ec=500√fck N/mm2 c) Ec=25√fck N/mm2 d) Ec=0.7√fck N/mm2 Ans:- choice (a) 17) A reinforced concrete structure should be designed to satisfy the subsequent criteria- a) Adequate safety, in items stiffness and sturdiness b) Reasonable economy c) Both a & b d) None of these Ans:- choice (c) 18) which of the subsequent design strategies are used for the design of RCC Structures. a) The working stress method (WSM) b) The ultimate load method (ULM) c) The limit state method (LSM) d) All of these Ans:- choice (d) 19) The WSM uses a factor of safety of about ______ with respect to the cube strength of concrete and a factor of safety of about _____ with reference to the yield strength of steel a) 1.5 & 3 b) 3 & 1.8 c) 1.5 & 1.15 d) 1.10 & 1.25 Ans:- choice (b) 20) _________the acceptable limits for the safety and serviceability needs of the structure before failure occurs. a) Limit State b) Limit state of collapse c) Limit State of serviceability d) Working stress method Ans:- choice (a) 21) _____________means that value of the strength of material below that no more than minimum acceptable percentage of test results are expected to fall. a) Characteristic load b) Design Load c) Characteristic strength d) Design strength Ans:- choice (c) 22) IS 456:2000 have accepted the minimum acceptable percentage as ________ for reinforced concrete structures. a) 5% b) 1.5% c) 10% d) 95% Ans:- choice (a) 23) When assessing the strength of a structure or structural member for the limit state of collapse, the values of partial factor of safety,  m should be taken as _____ for steel. a) 1 b) 1.15 c) 1.5 d) 1.8 Ans:- choice (b)