Top 1000+ Solved Material Science MCQ Questions Answer
Q. Cu and its alloys crack in ammonia and environments containing mercury
a. pitting corrosion
b. stress corrosion cracking
c. intergranular corrosion
d. erosion corrosion
Q. for a given metal or alloy, the possibility of stress corrosion depends upon
a. the oxygen content and ph value of electrolyte
b. the oxygen content
c. ph value of electrolyte
d. none of the above
Q. at a juction of two metals exposed to a corrosive environment is leads to
a. pitting corrosion
b. stress corrosion cracking
c. intergranular corrosion
d. crevice corrosion
Q. due to difference in oxygen concentration at two different points it leads to
a. pitting corrosion
b. stress corrosion cracking
c. intergranular corrosion
d. erosion corrosion
Q. the type of corrosion which take place in nut and bolt fittings is
a. pitting corrosion
b. stress corrosion cracking
c. crevice corrosion
d. intergranular erosion
Q. the combined effect of abrading action of turbulent flow of gases, vapours liquids and mechanical rubbing action of solids over a
a. pitting corrosion
b. stress corrosion
c. intergranular corrosion
d. crevice corrosion
Q. erosion corrosion caused by
a. the breakdown of preotective film at spot of impingement
b. turbulent flow of gases
c. both a and b
d. none of the above
Q. if a liquid passes from low pressure to high pressure region the type of corrosion is known as
a. pitting corrosion
b. stress corrosion cracking
c. cavitation corrosion
d. erosion corrosion
Q. due to collapse of vapours on walls of pipes it leads
a. pitting corrosion
b. stress corrosion cracking
c. cavitation corrosion
d. crevice corrosion
Q. cavitation corrosion can be miminized by
a. using suitable hydraulic design
b. using high strength corrosion resistant alloys
c. using protective coatings
d. all of the above
Q. small anodic area and large cathod is observed in
a. pitting corrosion
b. cavitation corrosion
c. both a and b
d. none of the above
Q. rotating pumps, valves are prone to
a. pitting corrosion
b. cavitation corrosion
c. both a and b
d. none of the above
Q. the components like heat exchanger are prone to
a. pitting corrosion
b. cavitation corrosion
c. high temperature corrosion
d. none of the above
Q. the resistance of material to high temperature corrosion can be increased by
a. addition of inhibitors
b. addition of metals as alloying elements in metal whichhas good
c. both a and b
d. none of the above
Q. combined action of corrosion and repeated cyclic loading is called as
a. pitting corrosion
b. stress corrosion cracking
c. cavitation corrosion
d. corrosion fatigue