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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 32
Q1 | usually in acidic environments like industrial watse, solution of non-oxidising acids the corrosion take place by
- hydrogen evolution
- oxyfen absorption
- both a and b
- none of the above
Q2 | Fe + 2H+ = Fe+2 + H2 ischemical reaction in
- hydrogen evolution
- oxyfen absorption
- both a and b
- none of the above
Q3 | all metal above hydrogen in electrochemical series will have tendency to get corroded by
- hydrogen evolution
- oxyfen absorption
- both a and b
- none of the above
Q4 | in hydrogen evolution mechanism of corroison
- cathode usually have large areas than anode
- anode usually have large areas than cathode
- anodes and cathodes are same
- none of the above
Q5 | when electrolyte is neutral acqueous solution or alkaline solution, the type of corrosion takes place is known as
- hydrogen evolution
- oxyfen absorption
- both a and b
- none of the above
Q6 | due to formation of pinholes, pits and cavities in the metal, the type of corrosion which takes place is known as
- stress corrosion cracking
- pitting corrosion
- crevice corrosion
- erosion corrosion
Q7 | formation of small anodic and large cathodic areas is a charatcristics of
- stress corrosion cracking
- pitting corrosion
- crevice corrosion
- erosion corrosion
Q8 | due to brakege of protective film the type of corrosion which takes palce is known as
- stress corrosion cracking
- pitting corrosion
- crevice corrosion
- erosion corrosion
Q9 | pitting corrosion can occur under the following conditions
- due to brake in protective coatings
- due to destruction of passive layer
- insufficient use of anodic inibitor
- all of the above
Q10 | the type of corrosion occurs in granular metals and in homogeneous alloys is known as
- stress corrosion cracking
- crevice corrosion
- intergranular corrosion
- erosion corrosion
Q11 | intergranular corroison occurs
- along the garin boundaries
- within the grains
- any where within the material
- none of the above
Q12 | due to difference in electrode potential at grain and grain boundaries the type of corrosion which take place is known as -
- stress corrosion cracking
- crevice corrosion
- intergranular corrosion
- erosion corrosion
Q13 | stainless steels are preone to
- stress corrosion cracking
- crevice corrosion
- intergranular corrosion
- erosion corrosion
Q14 | residual stresses in materis leads to
- stress corrosion cracking
- crevice corrosion
- intergranular corrosion
- erosion corrosion
Q15 | due to non uniform and rapid cooling, welding, poor design, precipitation of second phase material leads to
- crevice corrosion
- stress corrosion cracking
- intergranular corrosion
- erosion corrosion
Q16 | stress corrosion cracking can be reduced by
- eleminating the internal stresses with the help of heat treatment like stress- relief annealing or full annealing
- by taking proper manufacturin g process
- by using suitable material for suitable composition
- none of the above
Q17 | In Cu alloys season cracking is a type of
- crevice corrosion
- stress corrosion cracking
- intergranular corrosion
- erosion corrosion
Q18 | H2O + (1/2) O2 + 2e-1 --> 2OH-(Reduction) is reaction taking plcae at ---
- cathode
- anode
- both a and b
- none of the above
Q19 | in dissolved oxygen content of electrolyte has effect on corrosion reaction
- it forces the cathodic reaction to the right i.e. producing more oh- ions
- it removes more electrons and therefore accelarate the corrosion at the anode
- both are true sentenses
- none of the above is right
Q20 | in oxygen absorption reaction mechnism os corroison
- cathode usually have large areas than anode
- anode usually have large areas than cathode
- anodes and cathodes are same
- none of the above is right
Q21 | scratches, local straining of metal due to non- uniform stresses, sliding uncer load leads to
- pitting corrosion
- stress corrosion cracking
- intergranular corrosion
- erosion corrosion
Q22 | out of the following sentences which sentence is not true for pitting corrosion ?
- brake in protective caotings
- destruction of passive layer
- insufficient use of anodic inibitor
- none uniform heat treatment
Q23 | in intergranular corrosion
- grain acts as cathode
- gb acts as cathode
- gb acts as anode
- both a and c
Q24 | in stainless steel the precipitation of Cr carbides leads to
- pitting corrosion
- stress corrosion cracking
- intergranular corrosion
- erosion corrosion
Q25 | sensitized stainless steel are
- prone to corroiosn
- protected against corrosion
- not related with corrosion
- none of the above