Top 1000+ Solved Material Science MCQ Questions Answer
Q. corrosion fatigue can be reduce by
a. the treatment of corrosing medium
b. the surafce protection of metal
c. the nitriding of steels
d. all of the above
Q. hydrogen embrittlement
a. it is a low temperature phenomenon
b. it is a high temperature phenomenon
c. not related with the temperature
d. none of the above
Q. because of diffusion of hydrogen into the metal, the metal becomes brittle that leads to failure of the component is knowna as
a. hydrogen embrittleme nt
b. temper embrittleme nt
c. both a and b
d. none of the above
Q. in hydrogen embrittlement if the pressure of molecular hydrogen is greate rhan the yield strength of the material
a. then the component becomes brittle
b. then the component will fail
c. both a and b
d. none of the above
Q. in hydrogen embrittlement if the pressure of molecular hydrogen is greater than the ultimate strength of the material
a. then the component becomes brittle
b. then the component will fail
c. any one of above
d. none of the above
Q. hydrogen embrittlement
a. reduces the strength and increases the brittleness of the region around the defect
b. increases the strength and resuces the brittleness of the region around the defect
c. does not have any effect on strength but brittleness increases
d. does not have any effect on brittleness but strength increases
Q. low temperature phenomena associated with hydrogen is known as
a. hydrogen embrittleme nt
b. temper embrittleme nt
c. hydrogen attack
d. none of the above
Q. HIgh temperature phenomena associated with hydrogen is known as
a. hydrogen embrittleme nt
b. temper embrittleme nt
c. hydrogen attack
d. none of the above
Q. in case of steels, the raection between hydrogen and carbon forms methane which causes intergranular carcking, fissuring or blistering is known as
a. hydrogen embrittleme nt
b. temper embrittleme nt
c. hydrogen attack
d. none of the above
Q. according to principles usedin control and preventaion of design, the various methods (techniques) are classified as
a. modification of corrosiove environment
b. use of special alloys
c. application of protective coatings
d. all of the above
Q. the choice of metal or an alloy for any application depends on factors like
a. cost
b. mechanical properites
c. availability of material
d. all of the above
Q. following points are considered while selecting the material for a particular application
a. metals at anodic end of electrochemi cal series have more corrosion resistance than those at cathodic end
b. pure metals have more corrosion resistabce than the impure one; but pure metals have inadequate mechanical strength
c. use of single metal be preferred
d. all of the above
Q. metarials with characteristics have higher corrosion resistance
a. purity
b. coarse grained
c. smooth surface
d. all of the above
Q. during design and fabrication of the component, should be considered
a. avoid the contact of dissimilar metals in the presence of
b. when two dissimilar metals are to be in contact, anodic
c. proper fabrication should be done toavoid
d. all of the above
Q. during design and fabrication of the pipe and tanks, sharp bends and corners should be avoided because they form
a. stagnant areas
b. accumulation of solids
c. both a and b
d. none of the above