If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is
A. (L/2) (1 - 3/qmax)
B. (L/3) (1 - 5/qmax)
C. (L/2) (1 - 5/qmax)
D. (L/2) (1 - 2/qmax)
Answer: Option C
In a pre-stressed beam carrying an external load W with a bent tendon is having angle of inclination ? and pre-stressed load P. The net downward load at the centre is
A. W - 2P cos θ
B. W - P cos θ
C. W - P sin θ
D. W - 2P sin θ
Answer: Option D
If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by
A. (5/6) (r/1 + r²) M
B. (5/6) (r²/1 + r²) M
C. (5/6) (r²/1 + r³) M
D. (5/6) (r²/1 + r⁴) M
Answer: Option D
he minimum clear cover for R.C.C. columns shall be
A. Greater of 40 mm or diameter
B. Smaller of 40 mm or diameter
C. Greater of 25 mm or diameter
D. Smaller of 25 mm or diameter
Answer: Option C
If the length of an intermediate span of a continuous slab is 5 m, the length of the end span is kept
A. 4.5 m
B. 4.0 m
C. 3.5 m
D. 3.0 m
Answer: Option A
HINT 0.9 times of intermediate span=end span
Then, 5×.9=4.5
If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge
A. Is increased by PZ/e
B. Is increased by Pe/Z
C. Is decreased by Pe/Z
D. Remains unchanged
Answer: Option C
A foundation is called shallow if its depth, is
A. One-fourth of its width
B. Half of its width
C. Three-fourth of its width
D. Equal to its width
Answer: Option D
If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Answer: Option D
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, the beam
A. Is safe in shear
B. Is safe with stirrups
C. Is safe with stirrups and inclined bars
D. Needs revision of section
Answer: Option D
HINT
we know that moment M=V*LA where LA is liver arm (for given signs F=verticle shear force, v=horizontal shear force, x=longitudinal distance)now v=M/LA , also M=F*x
shear stress S=V/(B*x)
S=F/(B*LA)
for question:
S=12000*6/2*(30*55)=21.82 >8 kg/cm^2 hence unsafe
A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is
A. WL/P
B. WL/2P
C. WL/3P
D. WL/4P
Answer: Option C
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
A. Half of the width of the slab
B. Two-third of the width of the slab
C. Three-fourth of the width of the slab
D. Four-fifth of the width of the slab
Answer: Option C
If the permissible compressive stress for a concrete in bending is C kg/m², the modular ratio is
A. 2800/C
B. 2300/2C
C. 2800/3C
D. 2800/C²
Answer: Option C
In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
A. Less loaded column
B. More loaded column
C. A point of the maximum shear force
D. A point of zero shear force
Answer: Option D
On piles, the drop must be at least
A. 80 cm
B. 100 cm
C. 120 cm
D. 140 cm
Answer: Option C
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If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least
A. WL/P
B. WL/2P
C. WL/3P
D. WL/4P
Answer: Option D
As per IS : 456, the reinforcement in a column should not be less than
A. 0.5% and not more than 5% of cross-sectional area
B. 0.6% and not more than 6% of cross-sectional area
C. 0.7% and not more than 7% of cross-sectional area
D. 0.8% and not more than 8% of cross-sectional area
Answer: Option D
NOTE 0.8-6% HO ANSWER, BUT YAHA OPTION YESTO VAYEKO HUNALE KHYAL GARNE
If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than
A. 4 mm
B. 5 mm
C. 6 mm
D. 8 mm
Answer: Option C
Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than
A. One diameter of thinner bar
B. One diameter of thicker bar
C. Twice the diameter of thinner bar
D. None of these
Answer: Option B
If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than
A. WL/12 (L - 2D/3)²
B. WL/10 (L + 2D/3)²
C. WL/10 (L - 2D/3)²
D. WL/12 (L - D/3)²
Answer: Option C
The radius of a bar bend to form a hook, should not be less than
A. Twice the diameter
B. Thrice the diameter
C. Four times the diameter
D. Five times the diameter
Answer: Option A
A part of the slab may be considered as the flange of the T-beam if
A. Flange has adequate reinforcement transverse to beam
B. It is built integrally with the beam
C. It is effectively bonded together with the beam
D. All the above
Answer: Option D
If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be
A. 8hp/l
B. 8hp/l²
C. 8hl/p
D. 8hl/p²
Answer: Option B
Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
A. Are curtailed if not required to resist the bending moment
B. Are bent up at suitable places to serve as shear reinforcement
C. Are bent down at suitable places to serve as shear reinforcement
D. Are maintained at bottom to provide at least local bond stress
Answer: Option C
The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon
A. Breadth of the rib
B. Overall thickness of the rib
C. Centre to centre distance between T-beams
D. All the above
Answer: Option D
Lapped splices in tensile reinforcement are generally not used for bars of size larger than
A. 18 mm diameter
B. 24 mm diameter
C. 30 mm diameter
D. 36 mm diameter
Answer: Option D
HINT In compression 30dia..
Tension 36diaFor initial estimate for a beam design, the width is assumed
A. 1/15th of span
B. 1/20th of span
C. 1/25th of span
D. 1/30th of span
Answer: Option D
[A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by
A. Modular ratio method
B. Load factor method
C. Ultimate load method
D. None of these
Answer: Option A
The maximum diameter of a bar used in a ribbed slab, is
A. 12 mm
B. 6 mm
C. 20 mm
D. 22 mm
Answer: Option D
The transverse reinforcements provided at right angles to the main reinforcement
A. Distribute the load
B. Resist the temperature stresses
C. Resist the shrinkage stress
D. All the above
Answer: Option D
If ‘W’ is weight of a retaining wall and ‘P’ is the horizontal earth pressure, the factor of safety against sliding, is
A. 1.0
B. 1.25
C. 1.5
D. 2.0
Answer: Option C
If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:
A. [(p₁ - p₂)/2] + [(p₁ + p₂)/2] sin 2θ
B. [(p₁ - p₂)/2] + [(p₁ + p₂)/2] cos 2θ
C. [(p₁ + p₂)/2] + [(p₁ - p₂)/2] cos 2θ
D. [(p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ
Answer: Option C
The width of the rib of a T-beam, is generally kept between
A. 1/7 to 1/3 of rib depth
B. 1/3 to 1/2 of rib depth
C. 1/2 to 3/4 of rib depth
D. 1/3 to 2/3 of rib depth
Answer: Option D
If ‘H’ is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is
A. 0.3 H
B. 0.4 H
C. 0.5 H
D. 0.7 H
Answer: Option D
The thickness of base slab of a retaining wall generally provided, is
A. One half of the width of the stem at the bottom
B. One-third of the width of the stem at the bottom
C. One fourth of the width of the steam at the bottom
D. Width of the stem at the bottom
Answer: Option D
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
A. 42 diameters from the centre of the column
B. 42 diameters from the inner edge of the column
C. 42 diameters from the outer edge of the column
D. 24 diameters from the centre of the column
Answer: Option C
If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
A. (1 - C) mf - eE
B. (C - 1) mf + eE
C. (C - 1) mf - eE
D. (1 - C) mf + eE
Answer: Option B
The percentage of minimum reinforcement of the gross sectional area in slabs, is
A. 0.10 %
B. 0.12 %
C. 0.15 %
D. 0.18 %
Answer: Option C
If ‘W’ is the uniformly distributed load on a circular slab of radius ‘R’ fixed at its ends, the maximum positive radial moment at its centre, is
A. 3WR²/16
B. 2WR²/16
C. WR²/16
D. None of these
Answer: Option C
The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept
A. 0.7
B. 0.8
C. 0.9
D. 0.6
Answer: Option C
A ribbed slab is provided for
A. A plain ceiling
B. Thermal insulation
C. Acoustic insulation
D. All the above
Answer: Option D
The thickness of the topping of a ribbed slab, varies between
A. 3 cm to 5 cm
B. 5 cm to 8 cm
C. 8 cm to 10 cm
D. 12 cm to 15 cm
Answer: Option B
The live load to be considered for an accessible roof, is
A. Nil
B. 75 kg/m³
C. 150 kg/m²
D. 200 kg/cm²
Answer: Option C
