Description : The shrinkage strain of concrete is generally taken as [ A ] 0.3 [ B ] 0.03 [ C ] 0.003 [ D ] 0.0003
Last Answer : [ D ] 0.0003
Description : 0.003 × ? × 0.0003 = 0.00009 a) 10 b) 3 c) 0.03 d) 0.003 e) None of these
Last Answer : ? = 0.00009 / 0.003 × 0.0003 = 100 Answer: e)
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
Description : Increase-strain curve of concrete is (a) A perfect straight line upto failure (b) Straight line up to 0.002% strain value and then parabolic upto failure (c) Nearly parabolic up to 0.002% strain ... line upto failure (d) Hyperbolic up to 0.002% strain value and then a straight line upto failure
Last Answer : (c) Nearly parabolic up to 0.002% strain value and the a straight line upto failure
Description : In bridge widening projects, the method of stitching is normally employed for connecting existing deck to the new deck. What are the problems associated with this method in terms of shrinkage of concrete?
Last Answer : In the method of stitching, it is a normal practice to construct the widening part of the bridge at first and let it stay undisturbed for several months. After that, concreting will then be ... Stitching refers to formation of a segment of bridge deck between an existing bridge and a new bridge.
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
Description : 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
Description : Curing (A) Reduces the shrinkage of concrete (B) Preserves the properties of concrete (C) Prevents the loss of water by evaporation (D) All of the above
Last Answer : (D) All of the above
Description : The shrinkage of concrete (A) Is proportional to water content is the mix (B) Is proportional to cement concrete (C) Increases with age of concrete (D) All the above
Last Answer : (D) All the above
Description : The effect of adding calcium chloride in concrete is (i) To increase shrinkage (ii) To decrease shrinkage (iii) To increase setting time (iv) To decrease setting time The correct answer is (A) (i) and (iii) (B) (i) and (iv) (C) (ii) and (iii) (D) (ii) and (iv)
Last Answer : (B) (i) and (iv)
Description : Shrinkage in concrete can be reduced by using (A) Low water cement ratio (B) Less cement in the concrete (C) Proper concrete mix (D) All the above
Description : The property of the ingredients to separate from each other while placing the concrete is called (A) Segregation (B) Compaction (C) Shrinkage (D) Bulking
Last Answer : Answer: Option A
Description : 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 friction
Description : Shrinkage of concrete depends upon (i) Humidity of atmosphere (ii) Passage of time (iii) Stress The correct answer is (A) (i) and (ii) (B) (ii) and (iii) (C) Only (iii) (D) All (i), (ii) an
Description : The lower water cement ratio in concrete, introduces (A) Smaller creep and shrinkage (B) Greater density and smaller permeability (C) Improved frost resistance (D) All the above
Description : 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
Description : 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
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
Description : The object of curing is to (a) Prevent the loss of water by evaporation. (b) Reduce the shrinkage of concrete (c) Preserve the properties of concrete (d) All of these
Last Answer : (d) All of these
Description : 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.
Last Answer : [ D ] All the above.
Description : 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
Last Answer : [ D ] The total amount of water present in concrete
Description : Shrinkage in concrete can be reduced by using (i) Low water cement ratio (ii) More amount of cement in the concrete (iii) Presaturated aggregates [ A ] i [ B ] i and ii [ C ] i and iii [ D ] i, ii and iii
Last Answer : [ C ] i and iii
Description : Slump cone test is used to determine [ A ] Shrinkage of concrete mix [ B ] Creep of concrete [ C ] Workability of concrete mix [ D ] Soundness of concrete
Last Answer : [ C ] Workability of concrete mix
Description : The process of keeping the concrete structure moist is called [ A ] Hydration [ B ] Curing [ C ] Creep [ D ] Shrinkage
Last Answer : [ B ] Curing
Description : The process of hardening of concrete in the presence of water is called [ A ] Creep [ B ] Hydration [ C ] Shrinkage [ D ] Curing
Last Answer : [ B ] Hydration
Description : If a solid shaft (diameter 20 cm, length 400 cm, N = 0.8 × 105 N/mm2 ) when subjected to a twisting moment, produces maximum shear stress of 50 N/mm2 , the angle of twist in radians, is (A) 0.001 (B) 0.002 (C) 0.0025 (D) 0.003
Last Answer : (C) 0.0025
Description : According to Bazin's formula, the discharge over a rectangular weir is mL2g x H 3/2where m is equal to (A) 0.405 + (0.003/H) (B) 0.003 + (0.405/H) (C) 0.405 + (H/0.003) (D) 0.003 + (H/0.405)
Description : According to Whitney's theory, ultimate strain of concrete is assumed to be (A) 0.03 % (B) 0.1 % (C) 0.3 % (D) 3 %
Last Answer : Answer: Option C
Description : The concrete is assumed to reach failure with a compression strain of [ A ] 0.002 [ B ] 0.0035 [ C ] 0.0045 [ D ] 0.006
Last Answer : [ B ] 0.0035
Description : The theoretical stress-strain curve of the concrete in the Limit State design of structures is correspondingly reduced by the factor [ A ] 0.35 [ B ] 0.5 [ C ] 0.67 [ D ] 0.75
Last Answer : [ C ] 0.67
Description : The ultimate strain of concrete at failure is [ A ] 0.002 [ B ] 0.0035 [ C ] 0.0045 [ D ] 0.006
Description : What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10 6 approximately? (A) 0.003 (B) 0.01 (C) 0.1 (D) 0.3
Last Answer : (A) 0.003
Description : While determining the workability of concrete mix, the compaction factor test is ------than the slump cone test [ A ] Less accurate [ B ] More accurate [ C ] Approximate method [ D ] None of the above
Last Answer : [ B ] More accurate
Description : A prestressed concrete section is said to have failed in strength at the moment when all the material in the section has exhausted its (a) Stress limitations (b) Strain limitations (c) Stress as well as strain limitations (b) Laad limitations
Last Answer : (a) Stress limitations
Description : 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 ... different points in the section will be same [ D ] Plane section remain plane even after bending
Last Answer : [ C ] The strain at different points in the section will be same
Description : The stress-strain curve concrete in compression follows [ A ] a straight line [ B ] a rectangular parabolic curve [ C ] a semi circular arc [ D ] a cubic parabola
Last Answer : [ B ] a rectangular parabolic curve
Description : The continuous strain, which the concrete undergoes due to application of external loads is called [ A ] Creep [ B ] Bleeding [ C ] Workability [ D ] Segregation
Last Answer : [ A ] Creep
Description : Biomagnification of DDT in an aquatic food chain starting from water having a concentration of 0.003 ppb may go, in fish eating birds, upto:
Last Answer : Biomagnification of DDT in an aquatic food chain starting from water having a concentration of 0.003 ppb may go, in ... B. 50 ppm C. 25 ppm D. 2 ppm
Description : What is the significant figures of 0.003?
Last Answer : What is the answer ?
Description : What is 0.003 21 in words?
Last Answer : Need answer
Description : Is .003 seconds faster than 0.02 seconds?
Last Answer : .003 is faster than .005
Description : The specific gravity of urine normally ranges from (A) 0.900–0.999 (B) 1.003–1.030 (C) 1.000–1.001 (D) 1.101–1.120
Last Answer : B
Description : The probability thata singlebit will be inerror on a typical public telephone lineusing 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error ratefor a communicationline using 9-bit frames is ... to A. 0.003 B. 0.009 C. 0.991 D. 0.999 E. None of the above
Last Answer : 0.009
Description : The time of closing the cycle, in modern circuit breakers is (a) 0.003 sec (b) 0.001 sec (c) 0.01 sec (d) 0.10 sec (e) none of the above
Last Answer : (a) 0.003 sec
Description : A cantilever of length 2m carries a point load of 30KN at the free end.If I = 108 mm4 and E= 2×105 N/mm2. What is the slope of the cantilever at the free end? a.0.503 rad b.0.677 rad c. 0.003 rad d.0.008
Last Answer : c. 0.003 rad