Top 1000+ Solved Material Science MCQ Questions Answer
Q. one of the following is velocity related attack, due to fluid flow
a. cavitation corrosion
b. uniform corrosion
c. bimetal corrosion
d. intergranular corrosion
Q. erosion corrosion can be defined as
a. the precipitation of hard carbides at grain boundary
b. corrosion reaction which accelerated by the relative movement between a corrosive fluid and the metal surface
c. corrosion reaction due to bubbles flowing through the fluid gets burst
d. none of the above
Q. the rate of erosion corrosion is vary with the velocity of fluid i.e thed velocity of fluid is high. The statement stated is
a. false
b. true
c. not applicable to it
d. none of the above
Q. out of the following is the measure to control erosion corrosion
a. selection of resistant materials
b. decreasing the flow velocity
c. minimizing turebulence
d. all of the above
Q. out of the following is the measure to control erosion corrosion
a. decreasing the flow velocity
b. coating the metal surface
c. increasing the temperature of fluid
d. none of the above
Q. hard particles or asnd particels in a flowing fluid, causes which type of corrosion
a. cavitation corrosion
b. erosion corrosion
c. impingement corrosion
d. none of the above
Q. the corrosion profile of erosion corrosion shows
a. a smoooth surface profile with directional pattern
b. very rough surface with groves
c. very shiny surface
d. all of the above
Q. one of the following is the remedial measure to control or prevent impingemnet corrosion
a. selection of good resistant metal
b. filtering out the solid particles while entering he system
c. installation of water traps or wear plates and baffles in the path
d. all of the above
Q. stress corrosion cracking is a combined effect of
a. temperature and time
b. velocity and fluid
c. acidity and stress
d. corrosive environment and mechanical stresses
Q. stress corrosion cracking is
a. intergranular cracking
b. transgranular cracking
c. slow cracking
d. none of the above
Q. hydrogen blistering is happen only because of
a. atomic oxygen that
b. atomic hydrogen
c. atomic nitrogen that
d. none of the
Q. corrosion fatigue cracking is a combined effect of
a. strain and corrosion
b. stress and corrosion
c. cyclic stress and corrosion
d. none of the above
Q. cracking due to corrosion fatigue is mainly combine effect of
a. temperature and sluid flow
b. fluid velocity and stress
c. stress and corrosion
d. none of the above
Q. fatigue life of a metal in air is better than fatigue life in sea water. This statement is
a. true
b. false
c. not applicable to it
d. none of the above
Q. fatigue fracture is always initiated at
a. discontinuity on the surface
b. dicontinuity in the center of a metal
c. without any discontinity in the metal
d. none of the above