Rcc Structures Design Set 6

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This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 6

Q1 | The diameter of main bars in R.C.C. columns, shall not be less than
  • 6 mm
  • 8 mm
  • 10 mm
  • 12 mm
Q2 | If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bondstress, the bond length is given by
  • ft.d/4fb
  • ( /4). (ft.d/fb)
  • ft.d²/fb
  • ( /4). (ft.d3/fb)
Q3 | An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encasted with the floor of a hall 12 metres by 7 metres, is spaced at 3 metres from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is
  • 300 cm
  • 233 cm
  • 176 cm
  • 236 cm
Q4 | The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than
  • 18 bardiameters
  • 24 bardiameters
  • 30 bardiameters
  • 36 bardiameters
Q5 | As the percentage of steel increases
  • Depth of neutral axis decreases
  • Depth of neutral axis increases
  • Lever arm increases
  • Lever armdecreases
Q6 | The effective width of a column strip of a flat slab, is
  • One-fourth the width of the panel
  • Half the width of the panel
  • Radius of the column
  • Diameter ofthe column
Q7 | As per IS : 1343, total shrinkage for a pre-tensioned beam, is
  • 3.0 × 10-2
  • 3.0 × 10-3
  • 3.0 × 10-5
  • 3.5 × 10-5
Q8 | Dimensions of a beam need be changed if the shear stress is more than
  • 10 kg/cm2
  • 15 kg/cm2
  • 20 kg/cm2
  • 25 kg/cm2
Q9 | Based on punching shear consideration, the overall depth of a combined footing under a column A, is
  • (Area of the column A × Safe punching stress)/Load on column A
  • (Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
  • (Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
  • None of these
Q10 | Pick up the correct statement from the following:
  • A pile is a slender member which transfersthe load through its lower end on a strong strata
  • A pile is a slender member which transfers its load to the surrounding soil
  • A pile is a slender member which transfers its load by friction
  • A pile is a cylindrical body of concrete which transfersthe load at a depth greater than its width
Q11 | In a combined footing if shear stress exceeds 5 kg/cm2 , the nominal stirrups provided are:
  • 6 legged
  • 8 legged
  • 10 legged
  • 12 legged
Q12 | The weight of reinforced concrete, is generally taken as
  • 2200 kg/m3
  • 2300 kg/m3
  • 2400 kg/m3
  • 2500 kg/m3
Q13 | If W is the load on a circular slab of radius R, the maximum circumferential momentat the centre of the slab, is
  • WR²/16
  • 2WR²/16
  • 3WR²/16
  • Zero
Q14 | If is weight of a retainingwall and is the horizontal earth pressure, the factor of safety against sliding, is
  • 1
  • 1.25
  • 1.5
  • 2
Q15 | The effective span of a simply supported slab, is
  • Distance between the centres of thebearings
  • Clear distance between the inner faces of the walls plus twice the thickness of the wall
  • Clear span plus effective depth of the slab
  • None of these
Q16 | In a beam the local bond stress Sb, is equal to
  • Shearforce/(Leaver arm× Total perimeter ofreinforcement)
  • Total perimeter ofreinforcement/(Leaver arm × Shearforce)
  • Leaver arm/(Shearforce × Total perimeter ofreinforcement)
  • Leaver arm/(Bendingmoment × Total perimeter ofreinforcement)
Q17 | A continuous beam shall be deemed to be a deep beam if the ratio of effective span to overall depth, is
  • 2.5
  • 2
  • Less than 2
  • Less than 2.5
Q18 | With usual notations the depth of the neutral axis of a balanced section, is given by
  • mc/t = (d -n)/n
  • t/mc = (d -n)/n
  • t/mc = (d + n)/n
  • mc/t = n/(d - n)
Q19 | Pick up the true statement from the following:
  • Plain ceiling provides the best property diffusing light
  • In the absence of beams, it is easier to installpiping
  • In the absence of beams, it is easier topaint
  • All the above
Q20 | If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm2 , the length of the beam having nominal reinforcement, is
  • 8 cm
  • 6 m
  • 8 m
  • 10 m
Q21 | 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
  • WL/2
  • WL/4
  • WL/6
  • WL/8
Q22 | The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called
  • Balanced section
  • Economic section
  • Critical section
  • All the above
Q23 | 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
  • 12 bardiameters
  • 18 bardiameters
  • 24 bardiameters
  • 30 bardiameters
Q24 | The system in which high tensile alloy steel bars (silica manganese steel) are used as prestressing tendons, is known as
  • Freyssinet system
  • Magnel-Blaton system
  • C.C.L. standardsystem
  • Lee-McCallsystem
Q25 | An under-reinforced section means
  • Steel is provided at the underside only
  • Steel provided is insufficient
  • Steel provided on one face only
  • Steel will yieldfirst