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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
In order to obtain the best workability of concrete, the preferred shape of aggregate is

All of these
rounded
angular
elongated

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Concrete Technology and Design of Concrete Structures
A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

2.5
3.5
4.5
5.5

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Concrete Technology and Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

shrinkage of concrete
creep of concrete
loss due to friction
elastic shortening of concrete

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Concrete Technology and Design of Concrete Structures
The average permissible stress in bond for plain bars in tension is

decreased by 25% for bars in compression
decreased by 10% for bars in compression
increased by 10% for bars in compression
increased by 25% for bars in compression

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

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

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Concrete Technology and Design of Concrete Structures
Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

53 MPa and 42 MPa
42 MPa and 35 MPa
35 MPa and 42 MPa
42 MPa and 53 MPa

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