On This Page
This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 34
Q1 | in hydrogen embrittlement if the pressure of molecular hydrogen is greater than the ultimate strength of the material
- then the component becomes brittle
- then the component will fail
- any one of above
- none of the above
Q2 | hydrogen embrittlement
- reduces the strength and increases the brittleness of the region around the defect
- increases the strength and resuces the brittleness of the region around the defect
- does not have any effect on strength but brittleness increases
- does not have any effect on brittleness but strength increases
Q3 | low temperature phenomena associated with hydrogen is known as
- hydrogen embrittleme nt
- temper embrittleme nt
- hydrogen attack
- none of the above
Q4 | HIgh temperature phenomena associated with hydrogen is known as
- hydrogen embrittleme nt
- temper embrittleme nt
- hydrogen attack
- none of the above
Q5 | in case of steels, the raection between hydrogen and carbon forms methane which causes intergranular carcking, fissuring or blistering is known as
- hydrogen embrittleme nt
- temper embrittleme nt
- hydrogen attack
- none of the above
Q6 | according to principles usedin control and preventaion of design, the various methods (techniques) are classified as
- modification of corrosiove environment
- use of special alloys
- application of protective coatings
- all of the above
Q7 | the choice of metal or an alloy for any application depends on factors like
- cost
- mechanical properites
- availability of material
- all of the above
Q8 | following points are considered while selecting the material for a particular application
- metals at anodic end of electrochemi cal series have more corrosion resistance than those at cathodic end
- pure metals have more corrosion resistabce than the impure one; but pure metals have inadequate mechanical strength
- use of single metal be preferred
- all of the above
Q9 | metarials with characteristics have higher corrosion resistance
- purity
- coarse grained
- smooth surface
- all of the above
Q10 | during design and fabrication of the component, should be considered
- avoid the contact of dissimilar metals in the presence of
- when two dissimilar metals are to be in contact, anodic
- proper fabrication should be done toavoid
- all of the above
Q11 | during design and fabrication of the pipe and tanks, sharp bends and corners should be avoided because they form
- stagnant areas
- accumulation of solids
- both a and b
- none of the above
Q12 | during design and fabrication of component, type of joints should be used
- welded
- bolted
- riveted
- all of the above
Q13 | during design and fabriaction of the component, a good design should have properties
- no crevices between adjacent areas
- free drainage and easy washings
- no chance for differential aeration corrosion
- all of the above
Q14 | in modification of corrosive environment, the corrosive nature of environment is reduced by
- removing the harmful components in the environment
- neutralising the effect of corrosive constituents of environment
- both a and b
- none of the above
Q15 | modification of corrosive environment is done by technique
- deaeration
- deactivation
- dehumidifica tion
- all of the above
Q16 | in modification of corrosive environment, in oxygen concentrated cell, the technique of removel of oxygen from acqueous environmnet to reduce corrosion is called as
- deaeration
- deactivation
- dehumidifica tion
- all of the above
Q17 | in modification of corrosive environment, during technique, certain chemicals are added which combine rapildywith oxygen in acquous solution and reduce
- deaeration
- deactivation
- dehumidifica tion
- all of the above
Q18 | chemical is added during deactivation technique to modify corrosive environment
- sodium sulphite
- hydrazine hydrrate
- both a and b
- none of the above
Q19 | in modification of corrosion environment, technique resuces the moisture content of air in such a way that moisture should not condense on the metal surface causing corrosion
- deaeration
- deactivation
- dehumidifica tion
- all of the above
Q20 | substance which absobe moisture on its surface is used in dehumidification technique for midifiaction of corrosive environment
- alumina
- silica gel
- both a and b
- none of the above
Q21 | method of corrosive prevention is useful only in closed areas like air conditioned shops, laboratories, computer rooms etc.
- deactivation
- dehumidifica tion
- alkaline neutralizatio n
- dearation
Q22 | method is used to prevent the corroive environmnet by neutralising the acidic character of corrosive conditions
- deactivation
- dehumidifica tion
- alkaline neutralizatio n
- dearation
Q23 | substance is used in alkaline neutralization to prevent corrosive effect of environment
- nh3
- naoh
- lime
- all of the above
Q24 | method of corrosion prevention has widely ued in controlling the corrosion of refinery equipments
- deactivation
- dehumidifica tion
- alkaline neutralizatio n
- dearation
Q25 | in use of speacial alloys, alloying of with iron increase corrosion resitance
- cr
- ni
- both a and b
- tin