Rcc Structures Design Set 8

This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 8

Q1 | For M 150 mix concrete, according to I.S. specifications, local bond stress, is
• 5 kg/cm2
• 10 kg/cm2
• 15 kg/cm2
• 20 kg/cm2
Q2 | The minimum cube strength of concrete used for a pre-stressed member, is
• 50 kg/cm2
• 150 kg/cm2
• 250 kg/cm2
• 350 kg/cm2
Q3 | If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is
• d
• n
• d + n/3
• d - n/3
Q4 | The weight of a foundation is assumed as
• 5% of wallweight
• 7% of wallweight
• 10% of wall weight
• 12% of wallweight
Q5 | An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm placed symmetrically along the circumference. If it carries a load of 40, 000 kg axially, the stress is
• 49.9 kg/cm2
• 100 kg/cm2
• 250 kg/cm2
• 175 kg/cm2
Q6 | If the diameter of longitudinal bars of a square column is 16 mm, the diameter oflateral ties should not be less than
• 4 mm
• 5 mm
• 6 mm
• 8 mm
Q7 | Design of R.C.C. cantilever beams, is based on the resultant force at
• Fixed end
• Free end
• Mid span
• Mid span and fixed support
Q8 | In a combined footing if shear stress does not exceed 5 kg/cm2 , the nominal stirrups provided are
• 6 legged
• 8 legged
• 10 legged
• 12 legged
Q9 | The maximum shear stress (q) in concrete of a reinforced cement concrete beam is
• Shearforce/(Lever arm×Width)
• Lever arm/(Shearforce ×Width)
• Width/(Lever arm × Shearforce)
• (Shearforce × Width)/Lever arm
Q10 | An R.C.C. column is treated as long if its slenderness ratio is greater than
• 30
• 35
• 40
• 50
Q11 | The thickness of base slab of a retaining wall generally provided, is
• One half of the width of the stem at thebottom
• One-third of the width of the stem at the bottom
• One fourth of the width ofthe steam at the bottom
• Width of the stem at the bottom
Q12 | Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at
• Supports
• Mid span
• Every section
• Quarter span
Q13 | If the maximum shear stress at the end of a simply supported R.C.C. beam of 6 m effective span is 10 kg/cm2 , the share stirrups are provided for a distance from either end where, is
• 50 cm
• 100 cm
• 150 cm
• 200 cm
Q14 | Distribution reinforcement in a simply supported slab, is provided to distribute
• Temperature stress
• Shrinkage stress
• All the above
Q15 | Distribution of shear intensity over a rectangular section of a beam, follows:
• A circular curve
• A straight line
• A parabolic curve
• An ellipticalcurve
Q16 | In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called
• Under-reinforced section
• Over reinforced section
• Economic section
• Criticalsection
Q17 | If the size of a column is reduced above the floor, the main bars of the columns, are
• Continued up
• Bent inward at the floor level
• Stopped just below the floor level and separate lap barsprovided
• All the above
Q18 | The minimum number of main steel bars provided in R.C.C.
• Rectangular columns is 4
• Circular columns is 6
• Octagonal columns is 8
• All the above
Q19 | If T and R are tread and rise respectively of a stair, then
• 2R + T =60
• R + 2T = 60
• 2R + T = 30
• R + 2T = 30
Q20 | For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is
• wl²/4
• wl²/8
• wl²/12
• wl²/16
Q21 | In a singly reinforced beam, the effective depth is measured from its compression edge to
• Tensile edge
• Tensile reinforcement
• Neutral axis of the beam
• Longitudinal centralaxis
Q22 | Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as
• 1/8th of the span
• 1/10th of thespan
• 1/12th of thespan
• 1/16th of thespan
Q23 | On piles, the drop must be at least
• 80 cm
• 100 cm
• 120 cm
• 140 cm
Q24 | Steel beam theory is used for
• Design of simple steel beams
• Steel beams encased in concrete
• Doubly reinforced beams ignoring compressive stress inconcrete
• Beamsifshear exceeds 4 times allowable shearstress
Q25 | In a pre-stressed beam carrying an external load W with a bent tendon is having angle of -stressed load P. The net downward load at the centre is
• W - 2P
• W - P
• W - P
• W - 2P