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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The minimum cover to the ties or spirals should not be less than

15 mm
50mm
20 mm
25 mm

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Concrete Technology and Design of Concrete Structures
Maximum distance between expansion joints in structures as per IS : 456 – 1978 is

60 m
45 m
20 m
30 m

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Concrete Technology and Design of Concrete Structures
The minimum diameter of longitudinal bars in a column is

8 mm
6 mm
16 mm
12 mm

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

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

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Concrete Technology and Design of Concrete Structures
For the design of retaining walls, the minimum factor of safety against overturning is taken as

3
1.5
2
2.5

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

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

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