Objective Questions Concrete Technology and Design of Concrete Structures - Set 10 - ObjectiveBooks

Objective Questions Concrete Technology and Design of Concrete Structures - Set 10

Practice Test: Question Set - 10


1. Most common method of pre-stressing used for factory production is
    (A) Long line method
    (B) Freyssinet system
    (C) Magnel-Blaton system
    (D) Lee-Macall system

2. C.R.R.I. charts are used to obtain a relationship between strength of concrete and
    (A) Water cement ratio
    (B) Workability
    (C) Grading of aggregate
    (D) Fineness modulus

3. Pick up the correct statement from the following:
    (A) Sand obtained from pits, is washed to remove clay and silt
    (B) Sand obtained from flooded pits, need not be washed before use
    (C) The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
    (D) All the above

4. For the design of retaining walls, the minimum factor of safety against overturning is taken as
    (A) 1.5
    (B) 2.0
    (C) 2.5
    (D) 3.0

5. If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is
    (A) 10 %
    (B) 12 %
    (C) 15 %
    (D) 25 %

6. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
    (A) 20.5 mm
    (B) 30.5 mm
    (C) 40.5 mm
    (D) 50.5 mm

7. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then
    (A) There will be no settlement of columns
    (B) There will be no differential settlement
    (C) The settlement of exterior columns will be more than interior columns
    (D) The settlement of interior columns will be more than exterior columns

8. Saw dust can be rendered chemically inert by boiling it in water containing
    (A) Ferrous sulphate
    (B) Potassium chloride
    (C) Ammonia
    (D) Nitric acid

9. A concrete having a slump of 6.5 cm, is said to be
    (A) Dry
    (B) Earth moist
    (C) Semi-plastic
    (D) Plastic

10. 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) and (iii)

11. To obtain a very high strength concrete, use very fine grained
    (A) Granite
    (B) Magnetite
    (C) Barite
    (D) Volcanic scoria

12. Vicat apparatus is used for
    (A) Fineness test
    (B) Consistency test
    (C) Test for setting time
    (D) Test for tensile strength

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

14. The type of aggregates of same nominal size, which contain less voids when compacted, are
    (A) Rounded spherical
    (B) Irregular
    (C) Flaky
    (D) None of these

15. Pick up the correct statement from the following:
    (A) Continuous grading is not necessary for obtaining a minimum of air voids
    (B) The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve
    (C) The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation
    (D) All the above

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