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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 38
Q1 | one of the following is a velocity related corrosion attack, due to fluid flow
- erosion corrosion
- galvanic corrosion
- uniform corrosion
- none of the above
Q2 | one of the following is velocity related attack, due to fluid flow
- cavitation corrosion
- uniform corrosion
- bimetal corrosion
- intergranular corrosion
Q3 | erosion corrosion can be defined as
- the precipitation of hard carbides at grain boundary
- corrosion reaction which accelerated by the relative movement between a corrosive fluid and the metal surface
- corrosion reaction due to bubbles flowing through the fluid gets burst
- none of the above
Q4 | the rate of erosion corrosion is vary with the velocity of fluid i.e thed velocity of fluid is high. The statement stated is
- false
- true
- not applicable to it
- none of the above
Q5 | out of the following is the measure to control erosion corrosion
- selection of resistant materials
- decreasing the flow velocity
- minimizing turebulence
- all of the above
Q6 | out of the following is the measure to control erosion corrosion
- decreasing the flow velocity
- coating the metal surface
- increasing the temperature of fluid
- none of the above
Q7 | hard particles or asnd particels in a flowing fluid, causes which type of corrosion
- cavitation corrosion
- erosion corrosion
- impingement corrosion
- none of the above
Q8 | the corrosion profile of erosion corrosion shows
- a smoooth surface profile with directional pattern
- very rough surface with groves
- very shiny surface
- all of the above
Q9 | one of the following is the remedial measure to control or prevent impingemnet corrosion
- selection of good resistant metal
- filtering out the solid particles while entering he system
- installation of water traps or wear plates and baffles in the path
- all of the above
Q10 | stress corrosion cracking is a combined effect of
- temperature and time
- velocity and fluid
- acidity and stress
- corrosive environment and mechanical stresses
Q11 | stress corrosion cracking is
- intergranular cracking
- transgranular cracking
- slow cracking
- none of the above
Q12 | hydrogen blistering is happen only because of
- atomic oxygen that
- atomic hydrogen
- atomic nitrogen that
- none of the
Q13 | corrosion fatigue cracking is a combined effect of
- strain and corrosion
- stress and corrosion
- cyclic stress and corrosion
- none of the above
Q14 | cracking due to corrosion fatigue is mainly combine effect of
- temperature and sluid flow
- fluid velocity and stress
- stress and corrosion
- none of the above
Q15 | fatigue life of a metal in air is better than fatigue life in sea water. This statement is
- true
- false
- not applicable to it
- none of the above
Q16 | fatigue fracture is always initiated at
- discontinuity on the surface
- dicontinuity in the center of a metal
- without any discontinity in the metal
- none of the above
Q17 | metallic component gets fatigue due to which type of stresses applied
- tensile stresses
- compression stresses
- shear stresses
- cyclic stresses
Q18 | one of the following is a preventive measure to control corrosion fatigue failure
- eliminate cyclic stresses
- reduces stress concentratio n
- obtain a smooth and shiny surface on the metal
- all of the above
Q19 | high temperature corrosion of a carbon stee; can be a problem at a temperature above
- 500 oc
- 1000 oc
- 1500 oc
- none of the above
Q20 | the best example of high temperature corrosion is
- creep failure
- oxidation
- high temperature hydrogen attack
- all of the above
Q21 | the rate of corrosion increases as the temperature ncreases. The statement given is
- false
- true
- not applicable to it
- none of the above
Q22 | one of the following methods is not a corrosion prevention method
- internal and external coating
- corrosion inhibitor
- cathodic and anodic protection
- all of the above
Q23 | one of the following methods is not a corrosion prevention method
- use of special alloys
- removal of corrosive gases
- dehydration
- all of the above
Q24 | non metalic coatings are more durable than metallic coatings. The given statement is
- true
- false
- not applicable to it
- none of the above
Q25 | metaliic coatings gives best protection against corrosion over metallic coating. The statement is
- false
- true
- not applicable to it
- none of the above