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Concrete Technology and Design of Concrete Structures

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

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

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Concrete Technology and Design of Concrete Structures
Strength of concrete increases with

decrease in size of aggregate
increase in fineness of cement
decrease in curing time
increase in water-cement ratio

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

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Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

10%
20%
5%
15%

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Concrete Technology and Design of Concrete Structures
Increase in the moisture content in concrete

increases the strength
does not change the strength
All of these
reduces the strength

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Concrete Technology and Design of Concrete Structures
In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

tensile
compressive
tensile or compressive
zero

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