Rcc Structures Design Set 3

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This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 3

Q1 | High strength concrete is used in pre-stressed member
  • To overcome high bearing stresses developed at theends
  • To overcome bursting stresses at the ends
  • To provide high bond stresses
  • All the above
Q2 | If is the load on a circular slab of radius , the maximum radial moment at the centre of the slab, is
  • WR²/16
  • 2WR²/16
  • 3WR²/16
  • 5WR²/16
Q3 | If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight w per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is
  • h = (W/Aw)[(1 - )/(1 + sin )]
  • h = (W/Aw) [(1 + )/(1 + sin )]
  • h = (W/Aw) [(1 - )/(1 + sin )]²
  • h W/Aw) [(1 - )/(1 + sin )]²
Q4 | If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
  • 0.50%
  • 0.60%
  • 0.70%
  • 0.80%
Q5 | The modular ratio m of a concrete whose permissible compressive stress is C, maybe obtained from the equation.
  • m = 700/3C
  • m = 1400/3C
  • m = 2800/3C
  • m = 3500/3C
Q6 | Enlarged head of a supporting column of a flat slab is technically known as
  • Supporting end of the column
  • Top of the column
  • Capital
  • Drop panel
Q7 | Thickened part of a flat slab over its supporting column, is technically known as
  • Drop panel
  • Capital
  • Column head
  • None of these
Q8 | If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is
  • P/A
  • A/P
  • P/2A
  • 2A/P
Q9 | Side face reinforcement shall be provided in the beam when depth of the web in abeam exceeds
  • 50 cm
  • 75 cm
  • 100 cm
  • 120 cm
Q10 | A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip his
  • WL/P
  • WL/2P
  • WL/3P
  • WL/4P
Q11 | The minimum head room over a stair must be
  • 200 cm
  • 205 cm
  • 210 cm
  • 230 cm
Q12 | If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth(D) of the footing from punching shear consideration, is
  • D = W (a - b)/4a²bq
  • D = W (a² -b²)/4a²bq
  • D = W (a² -b²)/8a²bq
  • D = W (a² - b²)/4abq
Q13 | For initial estimate for a beam design, the width is assumed
  • 1/15th ofspan
  • 1/20th ofspan
  • 1/25th ofspan
  • 1/30th ofspan
Q14 | If the length of a combined footing for two columns l metres apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where is the distance of centre of gravity of column loads).
  • y = L - (l - )
  • y = L/2 + (l - )
  • y = L/2 - (l + )
  • y = L/2 - (l - )
Q15 | Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of
  • h/4
  • h/3
  • h/2
  • 2h/3
Q16 | If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge
  • Is increased byPZ/e
  • Is increased byPe/Z
  • Is decreased by Pe/Z
  • Remainsunchanged
Q17 | The Young's modulus of elasticity of steel, is
  • 150 KN/mm2
  • 200 KN/mm2
  • 250 KN/mm2
  • 275 KN/mm2
Q18 | Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by
  • Rankine formula
  • Marcus formula
  • Rankine Grashoff formula
  • Grashoffformula
Q19 | Spacing of stirrups in a rectangular beam, is
  • Kept constant throughout the length
  • Decreased towards the centre of the beam
  • Increased at the ends
  • Increased at the centre of the beam
Q20 | As per IS : 456, the reinforcement in a column should not be less than
  • 0.5% and not more than 5% of cross-sectional area
  • 0.6% and not more than 6% of cross-sectional area
  • 0.7% and not more than 7% of cross-sectional area
  • 0.8% and not more than 8% of cross-sectional area
Q21 | The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
  • 1400 kg/cm2
  • 190 kg/cm2
  • 260 kg/cm2
  • 230 kg/cm2
Q22 | Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
  • 42 diameters from the centre of the column
  • 42 diametersfrom the inner edge of the column
  • 42 diametersfrom the outer edge ofthe column
  • 24 diametersfrom the centre of the column
Q23 | Pick up the assumption for the design of a pre-stressed concrete member from the following:
  • A transverse plane section remains a plane afterbending
  • During deformation limits, Hook'slaw is equally applicable to concrete as well asto steel
  • Variation of stress in reinforcement due to changes in external loading is negligible
  • All the above
Q24 | The advantage of reinforced concrete, is due to
  • Monolithic character
  • Fire-resisting and durability
  • Economy because of less maintenance cost
  • All the above
Q25 | An R.C.C. column is treated as short column if its slenderness ratio is less than
  • 30
  • 35
  • 40
  • 50