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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
Diagonal tension in a beam

Decreases below the neutral axis and increases above the neutral axis
Remains same
Increases below the neutral axis and decreases above the neutral axis
Is maximum at neutral axis

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Concrete Technology and Design of Concrete Structures
The minimum cover in a slab should neither be less than the diameter of bar nor less than

15 mm
20 mm
10 mm
30 mm

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Concrete Technology and Design of Concrete Structures
Ultimate strength of cold drawn high steel wires

does not depend on diameter of bar
increases with increase in diameter of bar
None of these
decreases with increase in diameter of bar

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Concrete Technology and Design of Concrete Structures
Which of the following R.C. retaining walls is suitable for heights beyond 6m?

T-shaped wall
counterfort type
All of these
L-shaped wall

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beam i) reduces the negative moment at support ii) increases the negative moment at support iii) reduces the positive moment at center of span iv) increases the positive moment at center of span The correct answer is

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

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