# Rcc Structures Design Set 6

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
• 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