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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Which of the following has high tensile strength ?

cold drawn wires
heat treated rolled wires
plain hot rolled wires
all have same tensile strength

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

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed by i) maximum bending moment ii) shear force iii) punching shear The correct answer is

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

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

the effects of temperature variations
strength
the unit weight
workability

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Concrete Technology and Design of Concrete Structures
The factor of safety for

None of these
steel is higher than that for concrete
steel and concrete are same
steel is lower than that for concrete

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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

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

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