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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

wR/d
wR/2d
2wR/d
wR / 4d

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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
40 mm
45mm
60 mm

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Concrete Technology and Design of Concrete Structures
A higher modular ratio shows

lower tensile strength of steel
higher tensile strength of steel
higher compressive strength of con-crete
lower compressive strength of concrete

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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
Magnel-Blaton system
Freyssinet system

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Concrete Technology and Design of Concrete Structures
Air entrainment in the concrete increases

workability
the effects of temperature variations
the unit weight
strength

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Concrete Technology and Design of Concrete Structures
The effect of creep on modular ratio is

to keep it unchanged
either to decrease or to increase it
to increase it
to decrease it

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