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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