A reinforced concrete slab is 75 mm thick. The maximum size of reinforcement bar that can be used is (a) 6 mm diameter (b) 8 mm diameter (c) 10 mm diameter (d) 12 mm diameter

A reinforced concrete slab is 75 mm thick. The maximum size of reinforcement bar that can be used is
(a) 6 mm diameter (b) 8 mm diameter
(c) 10 mm diameter (d) 12 mm diameter
by

1 Answer

Answer :

(b) 8 mm diameter
by

Related questions

If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is (A) 10 mm (B) 12 mm (C) 14 mm (D) 16 mm

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The maximum diameter of a bar used in a ribbed slab, is (A) 12 mm (B) 6 mm (C) 20 mm (D) 22 mm

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The main reinforcement of a R.C. slab consists of 10 mm bars at 100 mm spacing; if it is desired to replace the 10 mm bars by 12 mm bars, then the spacing of 12mm bars should be (a) 120 mm (b) 140 mm (c ) 144 mm (d) 160mm

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The minimum cover in a slab should neither be less than the diameter of bar nor less than (A) 10 mm (B) 15 mm (C) 25 mm (D) 13 m

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The slab is said to be orthotropically reinforced , when the reinforcement is arranged in; [ A ] Single direction [ B ] Two directions at right angles with equal meshes [ C ] Two directions at right angles with unequal meshes [ D ] At the corners only

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Minimum clear cover (in mm) to the main steel bars in slab, beam, column and footing respectively, are (a) 10, 15, 20 and 25 (b) 15, 25, 40 and 75 (c ) 20, 25, 30 and 40 (d) 20, 35, 40 and 75

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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

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The size of the mesh at each corner meant for torsion reinforcement in a rectangular slab of size (Lx ´ Ly) is Lx = shorter span Lx = Longer span [ A ] 0.1 Ly x 1 Ly [ B ] 0.2 Ly x 0.2 Ly [ C ] 0.1 Lx x 0.1 Lx [ D ] 0.2 Lx x 0.2 Lx

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Last Answer : [ D ] 0.2 Lx x 0.2 Lx

The Minimum amount of steel for Main reinforcement in slab should be (Fe 415- grade of steel) [ A ] 0.12 percent of gross cross sectional area [ B ] 0.15 percent of gross cross sectional area [ C ] 0.20 percent of gross cross sectional area [ D ] 0.25 percent of gross cross sectional area.

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The amount of reinforcement for main bars in a slab, is based upon (A) Minimum bending moment (B) Maximum bending moment (C) Maximum shear force (D) Minimum shear force

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The amount of reinforcement for main bars in a slab, is based upon (a) Maximum bending moment (b) Minimum bending moment (c) Maximum shear force (d) Minimum shear force

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According to IS: 456-2000 spacing of vertical stirrups for shear reinforcement has been limited to [ A ] 0.75 d [ B ] 450 mm [ C ] lesser of 0.75 d or 300 mm [ D ] lesser of 0.75d or 450 mm

Description : According to IS: 456-2000 spacing of vertical stirrups for shear reinforcement has been limited to [ A ] 0.75 d [ B ] 450 mm [ C ] lesser of 0.75 d or 300 mm [ D ] lesser of 0.75d or 450 mm

Last Answer : [ C ] lesser of 0.75 d or 300 mm

Which of the following statement is correct (a) The maximum size of coarse aggregate should not exceed one fourth of the minimum dimension of the plain concrete member. (b) The maximum size of coarse aggregate should not exceed one fifty of the minimum dimension of the reinforced concrete member (c)The aggregates of 40mm, 20mm and 10mm sizes are commonly used for concrete works (d) All the above

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Description : If a concrete column 200 200 mm in cross-section is reinforced with four steel bars of 1200  mm2  total cross-sectional area. Calculate the safe load for the column if permissible stress in  concrete is 5 N/mm2 ... 15 Ec (A) 264 MN  (B) 274 MN  (C) 284 MN  (D) 294 MN 

Last Answer : (C) 284 MN 

In reinforced concrete footing on soil, the minimum thickness at edge should not be less than (A) 100 mm (B) 150 mm (C) 200 mm (D) 250 mm

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In a reinforced concrete column, the cross –sectional area of steel bar is as and that of concrete ia AC; the equivalent area of the section n terms of concrete is equal to. (a) As+mAc (b) Ac+mAs (c) As-mAc (d) Ac-mAs

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Last Answer : (b) Ac+mAs

According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than (A) 20 cm (B) 30 cm (C) 40 cm (D) 75 cm

Description : According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than (A) 20 cm (B) 30 cm (C) 40 cm (D) 75 cm

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A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, is (A) 20 cm (B) 25 cm (C) 30 cm (D) 35 cm

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Last Answer : Answer: Option C

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be (A) 0.75 - 0.80 (B) 0.80 - 0.85 (C) 0.85 - 0.92 (D) Above 0.92

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Last Answer : Answer: Option D

If diameter of a reinforcement bar is d, the anchorage value of the hook is (A) 4d (B) 8d (C) 12d (D) 16d

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Last Answer : Answer: Option D

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 (A) 18 bar diameters (B) 24 bar diameters (C) 30 bar diameters (D) 36 bar diameters

Description : 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 (A) 18 bar diameters (B) 24 bar diameters (C) 30 bar diameters (D) 36 bar diameters

Last Answer : 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

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Minimum pitch of transverse reinforcement in a column is (A) The least lateral dimension of the member (B) Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied (C) Forty-eight times the diameter of transverse reinforcement (D) Lesser of the above three values

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A compound bar consists of two bars of equal length. Steel bar cross-section is 3500 mm2 and that of brass bar is 3000 mm2 . These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm2 and Eb = 0.1 MN/mm2 , the stresses developed are: (A) b = 10 N/mm2s = 20 N/mm2(B) b = 8 N/mm2s = 16 N/mm2(C) b = 6 N/mm2s = 12 N/mm2(D) b = 5 N/mm2s = 10 N/mm

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Last Answer : (A) b = 10 N/mm2 s  = 20 N/mm

If the bond stress developed in a reinforced concrete beam is more than permissible value, it can be brought down by. (a) Increasing the depth of beam (b) Increasing the number of bars. (c) Decreasing the diameter of the bars (d) All of these

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Last Answer : (d) All of these

A steel bar 20 mm in diameter simply-supported at its ends over a total span of 40 cm carries a load at its centre. If the maximum stress induced in the bar is limited to N/mm2, the bending strain energy stored in the bar, is (A) 411 N mm (B) 511 N mm (C) 611 N mm (D) 711 N mm

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