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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