A pre-stressed concrete member is preferred because (A) Its dimensions are not decided from the diagonal tensile stress (B) Large size of long beams carrying large shear force need not be adopted (C) Removal of cracks in the members due to shrinkage (D) All the above

A pre-stressed concrete member is preferred because
(A) Its dimensions are not decided from the diagonal tensile stress
(B) Large size of long beams carrying large shear force need not be adopted
(C) Removal of cracks in the members due to shrinkage
(D) All the above
by

1 Answer

Answer :

Answer: Option D
by

Related questions

Which one of the following statements is not correct with respect to PSC beams? (a) Loss due to shrinkage is proportional to water-cement ratio used in concrete (b) Loss due to creep is proportional to the age of the member at the time of loading. (c) Loss due to elastic deformation is directly proportionally to the modulus of elasticity of concrete (d) Loss due to friction occurs in post tensioned concrete members

Description : Which one of the following statements is not correct with respect to PSC beams? (a) Loss due to shrinkage is proportional to water-cement ratio used in concrete (b) Loss due to creep is ... to the modulus of elasticity of concrete (d) Loss due to friction occurs in post tensioned concrete members

Last Answer : (c) Loss due to elastic deformation is directly proportionally to the modulus of elasticity of concrete

In a pre-stressed member it is advisable to use (A) Low strength concrete only (B) High strength concrete only (C) Low strength concrete but high tensile steel (D) High strength concrete and high tensile

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Pick up the assumption for the design of a pre-stressed concrete member from the following: (A) A transverse plane section remains a plane after bending (B) During deformation limits, Hook's law is equally applicable to concrete as well as to steel (C) Variation of stress in reinforcement due to changes in external loading is negligible (D) All the above

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Last Answer : Answer: Option D

The purpose of reinforcement in pre-stressed concrete is (A) To provide adequate bond stress (B) To resist tensile stresses (C) To impart initial compressive stress in concrete (D) All of the above

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If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is (A) P/A (B) A/P (C) P/2A (D) 2A/P

Description : If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is (A) P/A (B) A/P (C) P/2A (D) 2A/P

Last Answer : Answer: Option A

After pre-stressing process is completed, a loss of stress is due to (A) Shrinkage of concrete (B) Elastic shortening of concrete (C) Creep of concrete (D) All the above

Description : After pre-stressing process is completed, a loss of stress is due to (A) Shrinkage of concrete (B) Elastic shortening of concrete (C) Creep of concrete (D) All the above

Last Answer : Answer: Option D

Which of the following losses of pre-stress occurs only in pre-tensioning and not in posttensioning? (A) Elastic shortening of concrete (B) Shrinkage of concrete (C) Creep of concrete (D) Loss due to frictio

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Pick up the correct statement from the following: (A) Sand stones may be divided into calcareous, siliceous and ferruginous sand stones (B) Concrete using sand stones, cracks due to excessive shrinkage (C) Broken bricks produce a concrete having good fire resisting qualities (D) All the above

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In alluvial channels carrying clear water, the ratio of maximum tractive shear stress on the slides and that on the channel beams approximately. a) 0.5 b) 1.76 c) 0.76 d) 1.5

Description : In alluvial channels carrying clear water, the ratio of maximum tractive shear stress on the slides and that on the channel beams approximately. a) 0.5 b) 1.76 c) 0.76 d) 1.5

Last Answer : c) 0.76

Under normal loading conditions, the tensile stressed setup in the concrete will be _________the permissible stress. (a) More than (b) Less than (c) Equal to (d) All the above

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According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is (A) 5 kg/cm2 (B) 10 kg/cm2 (C) 15 kg/cm2 (D) 20 kg/cm

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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 - eEB) (C - 1)mf + eE(C) (C - 1)mf - eE(D) (1 - C)mf + eE

Description : 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

Last Answer : Answer: Option B

A pre-stressed concrete member (A) Is made of concrete (B) Is made of reinforced concrete (C) Is stressed after casting (D) Possesses internal stresses

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The minimum cube strength of concrete used for a pre-stressed member, is (A) 50 kg/cm2 (B) 150 kg/cm2 (C) 250 kg/cm2 (D) 350 kg/cm

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High strength concrete is used in pre-stressed member (A) To overcome high bearing stresses developed at the ends (B) To overcome bursting stresses at the ends (C) To provide high bond stresses (D) All the above

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Last Answer : Answer: Option D

Steel beam theory is used for (A) Design of simple steel beams (B) Steel beams encased in concrete (C) Doubly reinforced beams ignoring compressive stress in concrete (D) Beams if shear exceeds 4 times allowable shear stress

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Minimum shear reinforcement is necessary to [ A ] Prevent brittle shear failure [ B ] Prevent failure due to shrinkage and thermal stresses [ C ] Hold the reinforcements in place while pouring concrete [ D ] All the above.

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Last Answer : [ D ] All the above.

Shrinkage of concrete is mostly influenced by [ A ] Environmental conditions [ B ] Size of member [ C ] Cement in concrete [ D ] The total amount of water present in concrete

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is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is (A) f = (P/A) + (Z/M) (B) f = (A/P) + (M/Z) (C) f = (P/A) + (M/Z) (D) f = (P/A) + (M/6Z)

Description : is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is (A) f = (P/A) + (Z/M) ... ) + (M/Z) (C) f = (P/A) + (M/Z) (D) f = (P/A) + (M/6Z)

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is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on the beam subjected to a maximum bending moment is (A) f = (P/A) - (Z/M) (B) f = (A/P) - (M/Z) (C) f = (P/A) - (M/Z) (D) f = (P/A) - (M/6Z)

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Plain cement concrete is strong in taking (a) Compressive stress. (b) Tensile stress (c) Shear stress (d) All of these

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Last Answer : (a) Compressive stress.

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Pre-stress loss due to friction occurs (A) Only in post-tensioned beams (B) Only in pre-tensioned beams (C) In both post-tensioned and pre-tensioned beams (D) None of the above

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Last Answer : Answer: Option A

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively (A) Compressive and tensile (B) Tensile and compressive (C) Both compressive (D) Both tensile

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Last Answer : Answer: Option D

Joints in concrete structures, are provided (A) To reduce the tensile stresses likely to be developed due to evaporation of water (B) To minimise the change in the dimensions of the slab (C) To minimise the necessary cracking (D) All the above

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Last Answer : (D) All the above

A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is (A) 30 (B) 35 (C) 40 (D) 45

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Last Answer : Answer: Option C

If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be (A) 5 cm (B) 10 cm (C) 15 cm (D) 20 cm

Description : If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be (A) 5 cm (B) 10 cm (C) 15 cm (D) 20 cm

Last Answer : Answer: Option B

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

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Beams of uniform strength are preferred to those of uniform section because these are economical for (A) Large spans (B) Heavy weights (C) Light weights (D) Short spans

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The application of elastic theory to the beams is based on the assumption that (a) At any cross-section, plane sections before bending remain plane after bending (b) All tensile stresses are taken up by reinforcement alone and none by the concrete. (c) Steel reinforcement is free from initial stresses when it is embedded in concrete. (d) All of the above

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Flanged beams are preferred when the concrete in the slab is on the [ A ] compression side of the beam [ B ] tension side of the beam [ C ] may be compression side or tension side of the beam [ D ] none of the above

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The ‘transmission length’ requirement is to be satisfied in the design of (a) Pre-tensioned concrete beams (b) Post-tensioned concrete beam (c) Unbonded post-tensioned concrete (d) Post-tensioned continuous concrete beams

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The permissible diagonal tensile stress in reinforced brick work is (A) About 0.1 N/mm² (B) Zero (C) 0.3 N/mm² to 0.7 N/mm² (D) About 1.0 N/m2

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Last Answer : Answer: Option A

In pre-stressed concrete (A) Forces of tension and compression change but lever arm remains unchanged (B) Forces of tension and compressions remain unchanged but lever arm changes with the moment (C) Both forces of tension and compression as well as lever arm change (D) Both forces of tension and compression as well as lever arm remain unchanged

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Last Answer : Answer: Option B

A pre-stressed concrete pile is (A) Easy to handle (B) Lighter in weight (C) Extremely durable (D) All the above

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Inc case of prestressed concrete members, the bursting stresses develop at (a) Bond zone (b) Maximum bending moment zone (c ) Maximum shear stress zone (d) Anchorage zone

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A concrete block subjected to shear stresses, then the failure may result by [ A ] Diagonal tension [ B ] Longitudinal tension [ C ] Diagonal compression [ D ] None of the above

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The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm2 , safe shear stress 5 kg/cm2 and B.M. 24 mt, (A) Is safe in shear (B) Is unsafe in shear (C) Is over safe in shear(D) Needs redesigning

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