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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