Civil Engineering :: RCC Structures Design
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If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is
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If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)
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Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as
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Design of R.C.C. cantilever beams, is based on the resultant force at
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If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment
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Piles are usually driven by
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In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength
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The angle of internal friction of soil mass is the angle whose
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The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is
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Top bars are extended to the projecting parts of the combined footing of two columns L distance apart for a distance of
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According to the steel beam theory of doubly reinforced beams
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The thickness of the flange of a Tee beam of a ribbed slab is assumed as
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In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called
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The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or
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If At is the gross area of steel in tension, d is the effective depth of the beam and y is the depth of the centre of gravity of the resultant compression, the moment of resistance M of the beam, is given by
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A pre-stressed concrete member
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A part of the slab may be considered as the flange of the T-beam if
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An R.C.C. roof slab is designed as a two way slab if
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If C is creep coefficient, f is original prestress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
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In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
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A raft foundation is provided if its area exceeds the plan area of the building by
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The Total pressure on the vertical face of a retaining wall of height h exerted by the retained earth weighing w per unit volume having an angle of surcharge 뱡, is :
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If H is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is
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The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is
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. If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is
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In a combined footing if shear stress does not exceed 5 kg/cm2, the nominal stirrups provided are
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A flat slab is supported
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A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is
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If diameter of a reinforcement bar is d, the anchorge value of the hook is
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Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than
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If the size of a column is reduced above the floor, the main bars of the columns, are
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The system in which high tensile alloy steel bars (silica manganese steel) are used as prestressing tendons, is known as
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The minimum clear cover for R.C.C. columns shall be
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If jd is the lever arm and ΣO is the total perimeter of reinformcement of an R.C.C. beam, the bond stress at the section having Q shear force, is
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If the loading on a prestressed rectangular beam, is uniformly distributed, the tendon to be provided should be .
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The live load to be considered for an accessible roof, is
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A foundation is called shallow if its depth, is
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A circular slab subjected to external loading, deflects to form a
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An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is
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In a doubly-reinforced beam if c and t are stresses in concrete and tension reinforcement, d is the effective depth and n is depth of critical neutral axis n, the following relationship holds good
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In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed
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If the shear stress in a R.C.C. beam is
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If Sb, is the average bond stress on a bar of diameter d subjected to maximum stress t, the length of the embedment l is given by
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The maximum shear stress (q) in concrete of a reinforced cement concrete beam is
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An under-reinforced section means
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The spacing of transverse reinforcement of column is decided by the following consideration.
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P is the prestressed force applied to the tendon of a rectangular prestressed beam whose area of cross section is A and sectional modulus is Z. The maximum stress f in the beam, subjected to a maximum bending moment M, is
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If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by
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The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than
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A.
tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane |
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B.
sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane |
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C.
cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane |
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D.
none of these. |
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A.
wh cos α \(\frac { cos α - \sqrt{cos^2α-cos^2\varphi} } { cos a+\sqrt{cos^2a-cos^2\varphi} } \) |
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B.
\(Wh^2\) cos a \(\frac { cos α - \sqrt{cos^2α-cos^2\varphi} } { cos a+\sqrt{cos^2a+cos^2\varphi} } \) |
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C.
\(Wh^2/2\) cos a \(\frac { cos α - \sqrt{cos^2α-cos^2\varphi} } { cos a+\sqrt{cos^2a+cos^2\varphi} } \) |
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D.
\(\frac { Wh^2} { 3 } \) cos a \(\frac { cos α - \sqrt{cos^2α-cos^2\varphi} } { cos a-\sqrt{cos^2a-cos^2\varphi} } \) |
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A.
\(\frac { \text{shear force} } {\text{Lever arm*width} } \) |
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B.
\(\frac { \text{Lever arm}} { \text{shear force *width} } \) |
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C.
\(\frac { width } { \text{Lever arm *shear force} }\) |
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D.
\(\frac { \text{Shear fore *width} } { \text{lever arm} } \) |
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E.
\(\frac { \text{Lever arm *width} } { \text{Shear force} } \) |