Top 1000+ Solved Material Science MCQ Questions Answer
Q. intergranular corrosion take place at which portion of grain
a. phases in the grain
b. inclusions in the grain
c. grain boundary
d. twin boundary
Q. in case of stainless steels, which type of following effect is seen after welding
a. grantization
b. sensitization
c. graphitizatio n
d. none of the above
Q. which of the following element precipitate on grain boundary, when stainless steel gets sensitized ?
a. vanadium carbide
b. molybdenum carbide
c. tungsten carbide
d. chromium carbide
Q. the chemical formula for chromium carbide which precipitate at grain boundary due to sensitization is
a. cr23c6
b. cr21c5
c. cr20c2
d. cr0c0
Q. in case of intergranular corrosion, when grain boundary become ric in chromium then the % of chromium at the depleted region will become
a. lower than 12%
b. more than 12%
c. equal to 12%
d. none of the above
Q. when grain voundary becomes sucseptible to corrosion, due to chromium carbide in stainles steel, this stage of metal is known as
a. graphitizatio n
b. chromitizatio n
c. sensitization
d. none of the above
Q. one of the following is the preventive measure for intergranular corrosion
a. use of low carbon grade os stainless steel (304l, 316l grade)
b. use of stabilised grade of stainless steel (321 or322 grade)
c. use post weld heat treatment
d. all of the above
Q. one of the following step is used to control intergranular corrosion in stainless steel
a. use of metal coatings
b. use of cathodic protection
c. use of anodic protection
d. use of low carbon grade of stainless steel i.e.304l, 316l
Q. one of the following step is used to control intergranular corrosion in stainless steel
a. use of metal coating, like electroplatin g
b. use of stabilized grade of stinless steel i.e. (321, 322grade)
c. use of special type of inhibitor
d. all of the above
Q. what is meant by K.L.A.
a. kinetic low alloy
b. knife low alloy
c. knife line alloy
d. knife line attack
Q. knife line attack is which type of corrosion ?
a. bimetal corrosion
b. general corrosion
c. intergranular corrosion
d. all of the above
Q. which of the following ia a velocity related corrosion attack?
a. impingement corrosion
b. cavitation corrosion
c. erosion corrosion
d. all of the above
Q. one of the following is a velocity related corrosion attack in the pipeline
a. general corrosion
b. galvanic corrosion
c. intergranular corrosion
d. none of the above
Q. one of the following is a velocity related corrosion attack, due to fluid flow
a. impingement corrosion
b. crevice corrosion
c. bimetal corrosion
d. general corrosion
Q. one of the following is a velocity related corrosion attack, due to fluid flow
a. erosion corrosion
b. galvanic corrosion
c. uniform corrosion
d. none of the above