Regarding the working stress design of under reinforced concrete section, (a) The neutral axis depth will be greater than that of a balanced section. (b) The stress in steel intension will reach its maximum permissible value first. (c) The moment of resistance will be less than that of the balanced section. (d) The concrete on the tension side is also be considered for calculating the moment of resistance of the section.

Regarding the working stress design of under reinforced concrete section,
(a) The neutral axis depth will be greater than that of a balanced section.
(b) The stress in steel intension will reach its maximum permissible value first.
(c) The moment of resistance will be less than that of the balanced section.
(d) The concrete on the tension side is also be considered for calculating the moment of
resistance of the section.
by

1 Answer

Answer :

both b&c
by

Related questions

If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be (A) 0.35 d (B) 0.40 d (C) 0.45 d (D) Dependent on grade of concrete also

Description : If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be (A) 0.35 d (B) 0.40 d (C) 0.45 d (D) Dependent on grade of concrete also

Last Answer : Answer: Option B

If the depth of actual neutral axis of a doubly reinforced beam (A) Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier (B) Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier (C) Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously (D) All the above

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Last Answer : Answer: Option D

The section in which concrete is not fully stressed to its permissible value when stress in steel reaches its maximum value is (a) Under-reinforced section (b) Over-reinforced section (c) Critical section (d) Balanced section

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Last Answer : (a) Under-reinforced section

If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is (A) 37 cm (B) 38 cm (C) 39 cm (D) 40 cm

Description : If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is (A) 37 cm (B) 38 cm (C) 39 cm (D) 40 cm

Last Answer : Answer: Option D

The effective depth of a singly reinforced rectangular beam is 300mm. the section is over-reinforced and the neutral axis is 120mm below the top. If the maximum stress attained by concrete is 5N/mn2 and the modular ratio is 18, then the stress developed in the steel will (a) 130N/mm2 (b) 135N/mm2 (c) 160N/mm2 (d) 180N/mm2

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Last Answer : (b) 135N/mm2

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Last Answer : [ D ] i, ii and iii

If the depth of actual neutral axis is greater than the depth of critical neutral axis, then [ A ] Concrete attains its permissible stress earlier [ B ] Steel attains its permissible stress earlier [ C ] Both concrete and steel reaches its permissible stresses simultaneously [ D ] None of the above

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A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is (A) bn (fc /2) (d - n/3) (B) Atft (d - n/3) (C) ½ n1 (1 - n1/3) cbd² (D) All the above

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Last Answer : Answer: Option D

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In general in the design of a section by limit method, it is assumed that [ A ] the stress in steel to reach its yield limit before concrete failure [ B ] the stress in concrete to reach its permissible limit before to reach yield stress in steel [ C ] stresses in both concrete and steel reach their permissible values simultaneously [ D ] none of the above are correct

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The depth of neutral axis for a balanced section is --------- the depth of critical neutral axis [ A ] equal [ B ] always greater than [ C ] always less than [ D ] may be sometimes greater than

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If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called (A) Balanced beam (B) Under-reinforced beam (C) Over-reinforced beam (D) None of the above

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The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m = 15, the depth of its neutral axis is (A) 20 cm (B) 25 cm (C) 30 cm (D) 35 cm

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Last Answer : Answer: Option C

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 a reinforced concrete section, the shape of shear stress diagram is (A) Wholly parabolic (B) Wholly rectangular (C) Parabolic above neutral axis and rectangular below neutral axis (D) Rectangular above neutral axis and parabolic below neutral axis

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The actual neutral axis of n under reinforced section is above the critical neutral axis of a balanced section (a) Correct (b) Incorrect (c) Not known (d) None of these

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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 and Es is 15 Ec (A) 264 MN (B) 274 MN (C) 284 MN (D) 294 MN

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 

At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by (A) Depth of the section (B) Depth of the neutral axis (C) Maximum tensile stress at the section (D) Maximum compressive stress at the section

Description : At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of  the section by  (A) Depth of the section  (B) Depth of the neutral axis  (C) Maximum tensile stress at the section  (D) Maximum compressive stress at the section

Last Answer : (B) Depth of the neutral axis 

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

Description : 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

Last Answer : (d) All of these

The moment of resistance of an under- reinforced section is computer on the basis of (a) Compressive force developed in concrete (b) Tensile force developed in steel (c) Both (a) & (b) (d) All the above

Description : The moment of resistance of an under- reinforced section is computer on the basis of (a) Compressive force developed in concrete (b) Tensile force developed in steel (c) Both (a) & (b) (d) All the above

Last Answer : (b) Tensile force developed in steel

The neutral axis of an over –reinforced section falls (a) On the critical neutral axis of balanced section. (b) Below the critical neutral axis of balanced section (c) Above the neutral axis o balanced section (d) Al l the above

Description : The neutral axis of an over –reinforced section falls (a) On the critical neutral axis of balanced section. (b) Below the critical neutral axis of balanced section (c) Above the neutral axis o balanced section (d) Al l the above

Last Answer : (b) Below the critical neutral axis of balanced section

In an over-reinforced section (a) Steel reinforcement is not fully stressed to its permissible value (b) Concrete is not fully stressed to its permissible value (c) Either (a) and (b) (d) Both (a) and (b)

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Last Answer : (a) Steel reinforcement is not fully stressed to its permissible value

If M, I, R, E, F, and Y are the bending moment, moment of inertia, radius of curvature, modulus of elasticity stress and the depth of the neutral axis at section, then (A) M/I = R/E = F/Y (B) I/M = R/E = F/Y (C) M/I = E/R = E/Y (D) M/I = E/R = Y/F

Description : If M, I, R, E, F, and Y are the bending moment, moment of inertia, radius of curvature, modulus of  elasticity stress and the depth of the neutral axis at section, then  (A) M/I = R/E = F/Y (B) I/M = R/E = F/Y (C) M/I = E/R = E/Y (D) M/I = E/R = Y/F

Last Answer : (C) M/I = E/R = E/Y

In limit state design of concrete for flexure, the area of stress block is taken as (a) 0.530 fck. Xu (b) 0.446 fck . Xu ( c) 0.420 fck .Xu (d) 0.360 fck . Xu Where fck is characteristic compressive strength of concrete and Xu is the depth of neutral axis from top.

Description : In limit state design of concrete for flexure, the area of stress block is taken as (a) 0.530 fck. Xu (b) 0.446 fck . Xu ( c) 0.420 fck .Xu (d) 0.360 fck . Xu Where fck is characteristic compressive strength of concrete and Xu is the depth of neutral axis from top.

Last Answer : (d) 0.360 fck . Xu

Moment of resistance for a under reinforced section --------- that of a critical section [ A ] Is equal to [ B ] Is always greater than [ C ] Is less than [ D ] May be sometimes greater than

Description : Moment of resistance for a under reinforced section --------- that of a critical section [ A ] Is equal to [ B ] Is always greater than [ C ] Is less than [ D ] May be sometimes greater than

Last Answer : [ C ] Is less than

A short column 20 cm × 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm2 and 300 kg/cm2 , the Safe load on the column, should not exceed (A) 4120 kg (B) 41,200 kg (C) 412,000 kg (D) None of these

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Last Answer : Answer: Option B

If is the shear force at a section of an I-joist, having web depth and moment of inertia about its neutral axis, the difference between the maximum and mean shear stresses in the web is, (A) Sd²/8I (B) Sd²/12I (C) Sd²/16I(D) Sd²/24I

Description : If is the shear force at a section of an I-joist, having web depth and moment of inertia about its neutral axis, the difference between the maximum and mean shear stresses in the web is, (A) Sd²/8I (B) Sd²/12I (C) Sd²/16I (D) Sd²/24I

Last Answer : (D) Sd²/24I

In a reinforced concrete beam , the shear stress distribution above the neutral axis following a (a) A straight line (b) Circular curve (c) Parabolic curve (d) All the above

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Last Answer : (c) Parabolic curve

Consider the following statements: Percentage of steel for balanced designed of a singly reinforced rectangular section by limit state method depends on (1) Characteristic strength of concrete (2) Yield strength of concrete (3) Modulus of elasticity of steel (4) Geometry of the section. Which of these statements are correct? (a) 2, 3 and 4 (b) 1, 3 and 4 (c) 1, 2 and 4 (d) 1, 2 and 3

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Last Answer : 1,2,4

If the depth of actual axis in a beam is more than the depth of critical axis, then the beam is called (a) Over reinforced beam (b) Under-reinforced beam (c) Balanced beam (d) Deep beam

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Last Answer : (a) Over reinforced beam

With usual notations the depth of the neutral axis of a balanced section, is given by (A) mc/t = (d - n)/n (B) t/mc = (d - n)/n (C) t/mc = (d + n)/n (D) mc/t = n/(d - n)

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Last Answer : Answer: Option D

In a beam section, if the steel reinforcement is of such a magnitude that the permissible stresses in concrete and steel are developed simultaneously, the section is. (a) Balanced section (b) Economical section (c) Critical section (d) All the above

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Last Answer : (d) All the above

Select the incorrect statement from the following In eccentrically loaded columns, [ A ] The tensile strength of concrete is ignored [ B ] Design stress – strain curve for steel in compression is the same as in tension [ C ] The strain at different points in the section will be same [ D ] Plane section remain plane even after bending

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Last Answer : [ C ] The strain at different points in the section will be same

For a balanced section, the moment of resistance obtained from compressive force will be ___________the moment of resistance obtained from the tensile force (a) Greater than (b) Less than (c) Equal to (d) None of these

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Last Answer : (c) Equal to

According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is limited to (A) 0.43 d (B) 0.537 d (C) 0.68 d (D) 0.85 d Where d is effective depth of beam

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A doubly reinforced section is used (a) When the members are subjected to alternate external loads and the bending moment in the sections reverses. (b) When the member are subjected to loading eccentric in either side of the axis. (c) When the members are subjected to accidental lateral loads . (d) All of the above

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Last Answer : (d) All of the above

It is preferable, that the design of slab should result in [ A ] A balanced section [ B ] An under reinforced section [ C ] Over reinforced section [ D ] None of the above.

Description : It is preferable, that the design of slab should result in [ A ] A balanced section [ B ] An under reinforced section [ C ] Over reinforced section [ D ] None of the above.

Last Answer : [ B ] An under reinforced section

As per IS: 456, permissible bond stress for plain bars in tension, in working stress method, where M20, is the grade of concrete [ A ] 0.6 N/mm2 [ B ] 0.8 N/mm2 [ C ] 1.0 N/mm2 [ D ] 1.2 N/mm2

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Last Answer : [ B ] 0.8 N/mm2

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Last Answer : Answer: Option C