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This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 1
Q1 | An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, thebeam
- Is safe in shear
- Is safe with stirrups
- Is safe with stirrups and inclined bars
- Needsrevision of section
Q2 | According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is
- Half of the width of the slab
- Two-third of the width of the slab
- Three-fourth of the width of the slab
- Four-fifth of the width of the slab
Q3 | The load stress of a section can be reduced by
- Decreasing the lever arm
- Increasing the total perimeter of bars
- Replacing larger bars by greater number of smallbars
- Replacing smaller bars by greater number of greater bars
Q4 | The diameter of the column head support a flat slab, is generally kept
- 0.25 times the span length
- 0.25 times the diameter of the column
- 4.0 cm larger than the diameter of the column
- 5.0 cm larger than the diameter of the column
Q5 | If is the uniformly distributed load on a circular slab of radius fixed at its ends, the maximum positive radial moment at its centre, is
- 3WR²/16
- 2WR²/16
- WR²/16
- None of these
Q6 | The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is
- 35
- 25
- 30
- 20
Q7 | If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is
- Square
- Rectangular
- Trapezoidal
- Triangular
Q8 | The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept
- 0.7
- 0.8
- 0.9
- 0.6
Q9 | Pick up the correct statement from the following:
- Lateralreinforcementin R.C.C. columnsis provided to preventthe longitudinal reinforcement from buckling
- Lateral reinforcement prevents the shearing of concrete on diagonal plane
- Lateral reinforcement stops breaking away of concrete cover, due to buckling
- All the above
Q10 | In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as
- A key
- A cut-off wall
- A rib
- All the above
Q11 | Lapped splices in tensile reinforcement are generally not used for bars of size larger than
- 18 mmdiameter
- 24 mmdiameter
- 30 mmdiameter
- 36 mmdiameter
Q12 | Minimum spacing between horizontal parallel reinforcement of the same size should not be less than
- Onediameter
- 2.5diameters
- 3 diameters
- 3.5 diameters
Q13 | A very comfortable type of stairs is
- Straight
- Dog legged
- Geometrical
- Open newel
Q14 | Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension
- Two times
- Three times
- Four times
- Five times
Q15 | The width of the flange of a L-beam, should be less than
- One-sixth of the effective span
- Breadth of therib + four times thickness of the slab
- Breadth of the rib + half clear distance betweenribs
- Least of theabove
Q16 | A pre-stressed concrete member is preferred because
- Its dimensions are not decided from the diagonal tensile stress
- Large size of long beams carrying large shear force need not be adopted
- Removal of cracks in the members due toshrinkage
- All the above
Q17 | If the ratio of the span to the overall depth does not exceed 10, the stiffness of thebeam will ordinarily be satisfactory in case of a
- Simply supported beam
- Continuous beam
- Cantilever beam
- None of these
Q18 | A pile of length carrying a uniformlydistributed load per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is
- WL/8
- WL²/24
- WL²/47
- WL²/16
Q19 | If is the net upward pressure on a square footing of side for a square column of side , the maximum bending moment is given by
- B.M = pb (c - a)/4
- B.M = pb (b -a)²/4
- B.M = pb (b -a)²/8
- B.M = pb (b +a)/8
Q20 | To ensure uniform pressure distribution, the thickness of the foundation, is
- Kept uniform throughout
- Increased gradually towards the edge
- Decreased gradually towards the edge
- Kept zero at theedge
Q21 | longitudinal bars and lateral stirrups, is
- Stress in concrete × area of concrete
- Stress in steel × area ofsteel
- Stress in concrete × area of concrete + Stress in steel × area of steel
- None of these
Q22 | If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress to the principal plane carrying the principal stress p1, is:
- [(p - p p p sin 2
- [(p - p p p cos 2
- [(p p p - p cos 2
- [(p p p - p /2] sin 2
Q23 | The maximum permissible size of aggregates to be used in casting the ribs of a slab, is
- 5 mm
- 7.5 mm
- 10 mm
- 15 mm
Q24 | Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
- Are curtailed if not required to resist the bendingmoment
- Are bent up at suitable places to serve as shearreinforcement
- Are bent down at suitable places to serve asshear reinforcement
- Are maintained at bottom to provide at least local bond stress
Q25 | Steel bars are generally connected together to get greater length than the standardlength by providing
- Straight bar splice
- Hooked splice
- Dowel splice
- All the above