Civil Engineering MCQs

Page No. 253

Most common method of prestressing used for factory production is________________?


aLong line method

✓


b Freyssinet system

✖


cMagnel-Blaton system

✖


dLee-Macall system

✖


View Answer Long line method

Prestress loss due to friction occurs________________?


aonly in post-tensioned beams

✓


bonly in pretensioned beams

✖


cin both post-tensioned and preten-sioned beams

✖


dnone of the above

✖



High carbon content in the steel causes_______________?


adecrease in tensile strength but increase in ductility

✖


bincrease in tensile strength but decrease in ductility

✓


cdecrease in both tensile strength and ductility

✖


d increase in both tensile strength and ductility

✖



Ultimate strength of cold drawn high steel wires_______________?


aincreases with increase in diameter of bar

✖


bdecreases with increase in diameter of bar

✓


cdoes not depend on diameter of bar

✖


dnone of the above

✖



Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?


a35 MPa and 42 MPa

✖


b42 MPa and 35 MPa

✓


c 42 MPa and 53 MPa

✖


d 53 MPa and 42 MPa

✖


View Answer 42 MPa and 35 MPa

Stress strain curve of high tensile steel_______________?


a has a definite yield point

✖


bdoes not show definite yield point but yield point is defined by 0.1% proof stress

✖


cdoes not show definite yield point but yield point is defined by 0.2% proof stress

✓


ddoes not show definite yield point but yield point is defined by 2% proof stress

✖



Which of the following has high tensile strength ?


aplain hot rolled wires

✖


b cold drawn wires

✓


c heat treated rolled wires

✖


dall have same tensile strength

✖


View Answer cold drawn wires

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


aelastic shortening of concrete

✓


bshrinkage of concrete

✖


ccreep of concrete

✖


d loss due to friction

✖



Normally prestressing wires are arranged in the_______________?


a upper part of the beam

✖


b lower part of the beam

✓


ccenter

✖


danywhere

✖



In prestressed concrete______________?


aforces of tension and compression change but lever arm remains unchanged

✖


b forces of tension and compressions remain unchanged but lever arm changes with the moment

✓


c both forces of tension and compres-sion as well as lever arm change

✖


dboth forces of tension and compres-sion as well as lever arm remain unchanged

✖



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