Concrete Technology And Design Set 6

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This set of Concrete Technology and Design Multiple Choice Questions & Answers (MCQs) focuses on Concrete Technology And Design Set 6

Q1 | Which of the following losses of pre-stress occurs only in pre-tensioning and not in posttensioning?
  • elastic shortening of concrete
  • shrinkage of concrete
  • creep of concrete
  • loss due to friction
Q2 | The type of aggregates of same nominal size, which contain less voids when compacted, are
  • rounded spherical
  • irregular
  • flaky
  • none of these
Q3 | Pre-stress loss due to friction occurs
  • only in post-tensioned beams
  • only in pre-tensioned beams
  • in both post-tensioned and pre-tensioned beams
  • none of the above
Q4 | Pick up the correct statement from the following:
  • an increase in water content must be accompanied by an increase in cement content
  • angular and rough aggregates reduce the workability of the concrete
  • the slump of the concrete mix decreases due to an increase in temperature
  • all the above
Q5 | In the method of voids for determination of the quantity of cement paste, it is assumed that
  • voids in coarse aggregates are filled by fine aggregates
  • voids in fine aggregates are filled by the cement paste
  • volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra
  • all the above
Q6 | As compared to ordinary Portland cement, use of pozzolana cement
  • reduces workability
  • increases bleeding
  • increases shrinkage
  • increases strength
Q7 | The following proportion of the ingredients of concrete mix, is not in conformation to arbitrarymethod of proportioning
  • 1 : 1 : 2
  • 1 : 2 : 4
  • 1 : 3 : 6
  • 1 : 4 : 10
Q8 | The strength and quality of concrete, depend upon:
  • grading of aggregates
  • surface area of aggregates
  • shape of aggregates
  • all the above
Q9 | The factor of safety for
  • steel and concrete are same
  • steel is lower than that for concrete
  • steel is higher than that for concrete
  • none of the above
Q10 | The preliminary test is repeated if the difference of compressive strength of three test specimens,exceeds
  • 5 kg/cm2
  • 8 kg/cm2
  • 10 kg/cm2
  • 15 kg/cm2
Q11 | Setting time of cement increases by adding
  • gypsum
  • hydrogen peroxide
  • calcium chloride
  • sodium oxide
Q12 | According to IS: 4561978, the maximum reinforcement in a column is
  • 2 %
  • 4 %
  • 6 %
  • 8 %
Q13 | According to the recommendations of IS : 456-1978, the expansion joints
  • are provided where plane changes abruptly
  • are provided to ensure minimum resistance
  • do not carry reinforcement across them
  • all the above
Q14 | The impurity of mixing water which affects the setting time and strength of concrete, is
  • sodium sulphates
  • sodium chlorides
  • sodium carbonates and bicarbonates
  • calcium bicarbonates
Q15 | If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths ofcolumn strip and middle strip are
  • 3.0 m and 1.5 m
  • 1.5 m and 3.0 m
  • 3.0 m and 3.0 m
  • 1.5 m and 1.5 m
Q16 | Pick up the incorrect statement from the following:
  • the bottom and top ends of slump mould are parallel to each other
  • the axis of the mould is perpendicular to the end faces
  • the internal surface of the mould is kept clean and free from set cement
  • the mould is in the form of a frustum of hexagonal pyramid
Q17 | The concrete mix which causes difficulty in obtaining a smooth finish, possess
  • segregation
  • internal friction
  • hardness
  • bleeding
Q18 | While designing the pile as a column, the end conditions are nearly
  • both ends hinged
  • both ends fixed
  • one end fixed and other end hinged
  • one end fixed and other end free
Q19 | The internal dimensions of a ware house are 15 m × 5.6 m, and the maximum height of piles is2.70 m, the maximum number of bags to be stored in two piles, are
  • 1500 bags
  • 2000 bags
  • 2500 bags
  • 3000 bags
Q20 | Pick up the incorrect statement from the following. While performing preliminary test on concrete
  • proportions of the material and water should be the same as to be used at the work site
  • cement should be mixed by hand in order to maintain uniformity
  • concrete mix should be stored in air-tight containers
  • concrete ingredients should be kept at a temperature of 37° ± 2°c
Q21 | In a spherical dome the hoop stress due to a concentrated load at crown is
  • compressive everywhere
  • tensile everywhere
  • partly compressive and partly tensile
  • zero
Q22 | I.S. Sieve Nos. 10 mm and 4.75 mm are generally used for grading of
  • coarse aggregates
  • fine aggregates
  • neither (a) nor (b)
  • both (a) and (b)
Q23 | Log Angles machine is used to test the aggregate for
  • crushing strength
  • impact value
  • abrasion resistance
  • water absorption
Q24 | The property of the ingredients to separate from each other while placing the concrete is called
  • segregation
  • compaction
  • shrinkage
  • bulking
Q25 | Pick up the correct statement from the following:
  • higher workability indicates unexpected increase in the moisture content
  • higher workability indicates deficiency of sand
  • if the concrete mix is dry, the slump is zero
  • all the above