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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Ratio of permissible stress in direct compression and bending compression is

between 1.5 and 2.0
between 1 and 1.5
less than 1
greater than 2

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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

45mm
40 mm
50 mm
60 mm

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

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

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Concrete Technology and Design of Concrete Structures
The percentage of voids in cement is approximately

70%
60%
50%
40%

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Concrete Technology and Design of Concrete Structures
Shrinkage of concrete depends upon i) humidity of atmosphere ii) passage of time iii) stress The correct answer is

only (iii)
(ii) and (iii)
(i) and (ii)
All (i), (ii) and (iii)

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Concrete Technology and Design of Concrete Structures
In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

60%
50%
70 %
40%

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