Concrete Technology problems
- 1. 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. Discuss
Correct Answer: 13.5 mm.
- 2. 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. Discuss
Correct Answer: consistency test
- 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. Discuss
Correct Answer: fine sand
- 4. 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. Discuss
Correct Answer: 1 :
: 3 - 5. Pozzolanic properties exist in
Options- A. shales
- B. fly ash
- C. pumicite
- D. diatomaceous clay
- E. all the above. Discuss
Correct Answer: all the above.
- 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
Options- A. 20.5 mm
- B. 30.5 mm
- C. 40.5 mm
- D. 50.5 mm
- E. none of these. Discuss
Correct Answer: 40.5 mm
- 7. Workability improved by adding
Options- A. fly ash
- B. hydrated lime
- C. calcium chloride
- D. bentonite
- E. all the above. Discuss
Correct Answer: all the above.
- 8. 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. Discuss
Correct Answer: length 27 cm, breadth 27 cm, height 48 cm
- 9. 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. Discuss
Correct Answer: blast furnace slag cement
- 10. 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. Discuss
Correct Answer: All the above.
More in Civil Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.