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.Management Sciences
Category: Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?
A. elastic shortening of concrete
B. shrinkage of concrete
C. creep of concrete
D. loss due to friction
Modulus of rupture of concrete is a measure of_______________?
A. flexural tensile strength
B. direct tensile strength
C. compressive strength
D. split tensile strength
The minimum cover in a slab should neither be less than the diameter of bar nor less than_______________?
A. 10 mm
B. 15 mm
C. 25 mm
D. 13 mm
The effect of adding calcium chloride in concrete is________________?
1. to increase shrinkage
2. to decrease shrinkage
3. to increase setting time
4. to decrease setting time
The correct answer is?
A. (1) and (3)
B. (1)and(4)
C. (2)and (3)
D. (2)and (4)
When shear stress exceeds the permissible limit in a slab, then it is reduced by____________?
A. increasing the depth
B. providing shear reinforcement
C. using high strength steel
D. using thinner bars but more in number
If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are__________________?
A. 3.0 m and 1.5 m
B. 1.5 m and 3.0 m
C. 3.0 m and 3.0 m
D. 1.5 m and 1.5 m
1% of voids in a concrete mix would reduce its strength by about______________?
A. 5%
B. 10 %
C. 15%
D. 20%
The minimum diameter of longitudinal bars in a column is________________?
A. 6 mm
B. 8 mm
C. 12 mm
D. 16 mm
The slab is designed as one way if the ratio of long span to short span is_____________?
A. less than 1
B. between 1 and 1.5
C. between 1.5 and 2
D. greater than 2
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