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

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Concrete Technology and Design of Concrete Structures
Most common method of prestressing used for factory production is

Magnel-Blaton system
Long line method
Lee-Macall system
Freyssinet system

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Concrete Technology and Design of Concrete Structures
In counterfort retaining walls, the main reinforcement in the stem at support is

Not provided
Provided only on inner face
Provided both on inner and front faces
Provided only on front face

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

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

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Concrete Technology and Design of Concrete Structures
The slab is designed as one way if the ratio of long span to short span is

between 1.5 and 2
greater than 2
between 1 and 1.5
less than 1

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