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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The purpose of reinforcement in pre-stressed concrete is

To provide adequate bond stress
To impart initial compressive stress in concrete
To resist tensile stresses
All of these

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Concrete Technology and Design of Concrete Structures
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

50 mm
45mm
60 mm
40 mm

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Concrete Technology and Design of Concrete Structures
Workability of concrete is inversely proportional to

the air in the mix
time of transit
size of aggregate
vater-cement ratio

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Concrete Technology and Design of Concrete Structures
Poisson’s ratio for concrete

remains constant
None of these
increases with richer mixes
decreases with richer mixes

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Concrete Technology and Design of Concrete Structures
In a ring beam subjected to uniformly distributed load i) shear force at mid span is zero ii) shear force at mid span is maximum iii) torsion at mid span is zero iv) torsion at mid span is maximum The correct answer is

(i) and (iii)
(ii) and (iv)
(ii) and (iii)
(i) and (iv)

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Concrete Technology and Design of Concrete Structures
The fineness modulus of fine aggregate is in the range of

2.0 to 3.5
6.0 to 8.5
5.0 to 7.0
3.5 to 5.0

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