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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
In a spherical dome the hoop stress due to a concentrated load at crown is

compressive everywhere
partly compressive and partly tensile
tensile everywhere
zero

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

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

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Concrete Technology and Design of Concrete Structures
Prestress loss due to friction occurs

in both post-tensioned and preten-sioned beams
only in post-tensioned beams
None of these
only in pretensioned beams

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Concrete Technology and Design of Concrete Structures
Normally prestressing wires are arranged in the

upper part of the beam
center
anywhere
lower part of the beam

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Concrete Technology and Design of Concrete Structures
According to IS : 456- 1978, minimum slenderness ratio for a short column is

less than 18
more than 24
less than 12
between 18 and 24

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

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

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