Increase in water-cement ratio
Increase in fineness of cement
Decrease in curing time
Decrease in size of aggregate
Answer is Right!
Answer is Wrong!
Concrete technology and design of concrete structures
12. Examine the following statements : i) Factor of safety for steel should be based on its yield stress, ii) Factor of safety for steel should be based on its ultimate stress, iii) Factor of safety for concrete should be based on its yield stress, iv) Factor of safety for concrete should be based on its ultimate stress. The correct statements are A. (i) and (iii) B. (i) and (iv) C. (ii) and (iii) D. (ii) and (iv)
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
Answer is Right!
Answer is Wrong!
13. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse) A. 0.367 xu B. 0.416 xu C. 0.446 xu D. 0.573 xu
0.367 xu
0.416 xu
0.446 xu
0.573 xu
Answer is Right!
Answer is Wrong!
14. In prestressed concrete A. Forces of tension and compression change but lever arm remains unchanged B. Forces of tension and compression remains unchanged but lever arm changes with the moment C. Both forces of tension and compression as well as lever arm changes D. Both forces of tension and compression as well as lever arm remains unchanged
Forces of tension and compression change but lever arm remains unchanged
Forces of tension and compression remains unchanged but lever arm changes with the moment
Both forces of tension and compression as well as lever arm changes
Both forces of tension and compression as well as lever arm remains unchanged
Answer is Right!
Answer is Wrong!
15. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to A. Deflect downward B. Deflect upward C. Deflect downward or upward D. None of the above
Deflect downward
Deflect upward
Deflect downward or upward
None of the above
Answer is Right!
Answer is Wrong!
16. For a reinforced concrete section, the shape of shear stress diagram is A. Wholly parabolic B. Wholly rectangular C. Parabolic above neutral axis and rectangular below neutral axis D. Rectangular above neutral axis and parabolic below neutral axis
Wholly parabolic
Wholly rectangular
Parabolic above neutral axis and rectangular below neutral axis
Rectangular above neutral axis and parabolic below neutral axis
Answer is Right!
Answer is Wrong!
17. Finer grinding of cement A. Affects only the early development of strength B. Affects only the ultimate strength C. Both (A) and (B) D. Does not affect the strength
Affects only the early development of strength
Affects only the ultimate strength
Both (A) and (B)
Does not affect the strength
Answer is Right!
Answer is Wrong!
18. The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is A. Not needed B. Provided equally on inner and front faces C. Provided more on inner face than on front face D. Provided more on front face than on inner face
Not needed
Provided equally on inner and front faces
retaining wall is A. Not needed B. Provided equally on inner and front faces C. Provided more on inner face than on front face
Provided more on front face than on inner face
Answer is Right!
Answer is Wrong!
19. Due to circumferential action of the spiral in a spirally reinforced column A. Capacity of column is decreased B. Ductility of column reduces C. Capacity of column is decreased but ductility of column increases D. Both the capacity of column and ductility of column increase
Capacity of column is decreased
Ductility of column reduces
Capacity of column is decreased but ductility of column increases
Both the capacity of column and ductility of column increase
Answer is Right!
Answer is Wrong!
20. If nominal shear stress $${\tau _{\text{v}}}$$ exceeds the design shear strength of concrete $${\tau _{\text{c}}}$$, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to A. $${\tau _{\text{v}}}$$ B. $${\tau _{\text{c}}}$$ C. $${\tau _{\text{v}}} – {\tau _{\text{c}}}$$ D. $${\tau _{\text{v}}} + {\tau _{\text{c}}}$$
$${ au _{ ext{v}}}$$
$${ au _{ ext{c}}}$$
$${ au _{ ext{v}}} - { au _{ ext{c}}}$$
$${ au _{ ext{v}}} + { au _{ ext{c}}}$$
Answer is Right!
Answer is Wrong!