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Concrete Technology
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Question
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
Options
A. 20.5 mm
B. 30.5 mm
C. 40.5 mm
D. 50.5 mm
E. none of these.
Correct Answer
40.5 mm
Concrete Technology problems
Search Results
1. Pozzolanic properties exist in
Options
A. shales
B. fly ash
C. pumicite
D. diatomaceous clay
E. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
2. For the construction of the retaining structures, the type of concrete mix to be used, is
Options
A. 1 : 3 : 6
B. 1 : 2 :4
C. 1 :
: 3
D. 1 : l : 2
E. 1 : 4 : 8.
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Correct Answer: 1 :
: 3
3. If fineness modulus of sand is 2.5, it is graded as
Options
A. very fine sand
B. fine sand
C. medium sand
D. coarse sand
E. very coarse sand.
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Correct Answer: fine sand
4. Vicat apparatus is used for
Options
A. fineness test
B. consistency test
C. test for setting time
D. test for tensile strength
E. none of these.
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Correct Answer: consistency test
5. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
Options
A. 22.5 mm
B. 18.5 mm
C. 16.5 mm
D. 15.5 mm
E. 13.5 mm.
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Correct Answer: 13.5 mm.
6. Workability improved by adding
Options
A. fly ash
B. hydrated lime
C. calcium chloride
D. bentonite
E. all the above.
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Correct Answer: all the above.
7. The dimensions of a 35 litre forma for measuring aggregates by volume, are :
Options
A. length 30 cm, breadth 25 cm, height 30 cm
B. length 39 cm, breadth 25 cm, height 32 cm
C. length 27 cm, breadth 27 cm, height 48 cm
D. length 220 cm, breadth 25 cm, height 40 cm
E. none of these.
Show Answer
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Correct Answer: length 27 cm, breadth 27 cm, height 48 cm
8. For the construction of thin R.C.C. structures, the type of cement to be avoided, is
Options
A. ordinary Portland cement
B. rapid hardening cement
C. low heat cement
D. blast furnace slag cement
E. sulphate resisting cement.
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Correct Answer: blast furnace slag cement
9. Pick up the correct statement from the following:
Options
A. The concrete gains strength due to hydration of cement
B. The concrete cured at a temperature below 23°C, gains strength up to 28 days
C. The concrete does not set at freezing point
D. The strength of concrete increases with its age
E. All the above.
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Correct Answer: All the above.
10. Concrete gains strength due to
Options
A. chemical reaction of cement with sand and coarse aggregates
B. evaporation of water from concrete
C. hydration of cement
D. All the above.
Show Answer
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Correct Answer: hydration of cement
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