McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 801. |
sensitized stainless steel means |
| A. | group of steel prone to corrosion in welding in the range of 500 to 800 oc |
| B. | group of steel prone to corrosion in welding below 500 oc |
| C. | group of steel prone to corrosion in welding above 800 oc |
| D. | none of the above |
| Answer» A. group of steel prone to corrosion in welding in the range of 500 to 800 oc | |
| 802. |
the type of corrosion which is produced by con=mbined effect of mechanical stress and a corrosive environment on metal is called as |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» B. stress corrosion cracking | |
| 803. |
in stress corrosion cracking |
| A. | only internal stresses are |
| B. | only extrenal stresses are |
| C. | only residual stres are |
| D. | all of the above |
| Answer» D. all of the above | |
| 804. |
the critical level of stress depends uopn factor |
| A. | composition of alloy |
| B. | grain size, microstructur e and geometry of the component |
| C. | surface finish of the component |
| D. | all of the above |
| Answer» D. all of the above | |
| 805. |
the critical level of stress depends uopn factor |
| A. | composition of alloy |
| B. | type of environmnet |
| C. | service temperatue |
| D. | all of the above |
| Answer» D. all of the above | |
| 806. |
carbon steels crack in nitrate solutions is a type of |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» C. intergranular corrosion | |
| 807. |
Cu and its alloys crack in ammonia and environments containing mercury |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | intergranular corrosion |
| D. | erosion corrosion |
| Answer» C. intergranular corrosion | |
| 808. |
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 |
| Answer» A. the oxygen content and ph value of electrolyte | |
| 809. |
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 |
| Answer» D. crevice corrosion | |
| 810. |
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 |
| Answer» D. erosion corrosion | |
| 811. |
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 |
| Answer» C. crevice corrosion | |
| 812. |
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 |
| Answer» A. pitting corrosion | |
| 813. |
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 |
| Answer» C. both a and b | |
| 814. |
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 |
| Answer» C. cavitation corrosion | |
| 815. |
due to collapse of vapours on walls of pipes it leads |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | cavitation corrosion |
| D. | crevice corrosion |
| Answer» C. cavitation corrosion | |
| 816. |
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 |
| Answer» D. all of the above | |
| 817. |
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 |
| Answer» C. both a and b | |
| 818. |
rotating pumps, valves are prone to |
| A. | pitting corrosion |
| B. | cavitation corrosion |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 819. |
the components like heat exchanger are prone to |
| A. | pitting corrosion |
| B. | cavitation corrosion |
| C. | high temperature corrosion |
| D. | none of the above |
| Answer» C. high temperature corrosion | |
| 820. |
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 which has good |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 821. |
combined action of corrosion and repeated cyclic loading is called as |
| A. | pitting corrosion |
| B. | stress corrosion cracking |
| C. | cavitation corrosion |
| D. | corrosion fatigue |
| Answer» D. corrosion fatigue | |
| 822. |
corrosion fatigue can be reduce by |
| A. | the treatment of corrosing medium |
| B. | the surafce protection of metal |
| C. | the nitriding of steels |
| D. | all of the above |
| Answer» D. all of the above | |
| 823. |
hydrogen embrittlement |
| A. | it is a low temperature phenomenon |
| B. | it is a high temperature phenomenon |
| C. | not related with the temperature |
| D. | none of the above |
| Answer» A. it is a low temperature phenomenon | |
| 824. |
because of diffusion of hydrogen into the metal, the metal becomes brittle that leads to failure of the component is knowna as |
| A. | hydrogen embrittleme nt |
| B. | temper embrittleme nt |
| C. | both a and b |
| D. | none of the above |
| Answer» A. hydrogen embrittleme nt | |
| 825. |
in hydrogen embrittlement if the pressure of molecular hydrogen is greate rhan the yield strength of the material |
| A. | then the component becomes brittle |
| B. | then the component will fail |
| C. | both a and b |
| D. | none of the above |
| Answer» A. then the component becomes brittle | |
| 826. |
in hydrogen embrittlement if the pressure of molecular hydrogen is greater than the ultimate strength of the material |
| A. | then the component becomes brittle |
| B. | then the component will fail |
| C. | any one of above |
| D. | none of the above |
| Answer» B. then the component will fail | |
| 827. |
hydrogen embrittlement |
| A. | reduces the strength and increases the brittleness of the region around the defect |
| B. | increases the strength and resuces the brittleness of the region around the defect |
| C. | does not have any effect on strength but brittleness increases |
| D. | does not have any effect on brittleness but strength increases |
| Answer» A. reduces the strength and increases the brittleness of the region around the defect | |
| 828. |
low temperature phenomena associated with hydrogen is known as |
| A. | hydrogen embrittleme nt |
| B. | temper embrittleme nt |
| C. | hydrogen attack |
| D. | none of the above |
| Answer» A. hydrogen embrittleme nt | |
| 829. |
HIgh temperature phenomena associated with hydrogen is known as |
| A. | hydrogen embrittleme nt |
| B. | temper embrittleme nt |
| C. | hydrogen attack |
| D. | none of the above |
| Answer» C. hydrogen attack | |
| 830. |
in case of steels, the raection between hydrogen and carbon forms methane which causes intergranular carcking, fissuring or blistering is known as |
| A. | hydrogen embrittleme nt |
| B. | temper embrittleme nt |
| C. | hydrogen attack |
| D. | none of the above |
| Answer» C. hydrogen attack | |
| 831. |
according to principles usedin control and preventaion of design, the various methods (techniques) are classified as |
| A. | modification of corrosiove environment |
| B. | use of special alloys |
| C. | application of protective coatings |
| D. | all of the above |
| Answer» D. all of the above | |
| 832. |
the choice of metal or an alloy for any application depends on factors like |
| A. | cost |
| B. | mechanical properites |
| C. | availability of material |
| D. | all of the above |
| Answer» D. all of the above | |
| 833. |
following points are considered while selecting the material for a particular application |
| A. | metals at anodic end of electrochemi cal series have more corrosion resistance than those at cathodic end |
| B. | pure metals have more corrosion resistabce than the impure one; but pure metals have inadequate mechanical strength |
| C. | use of single metal be preferred |
| D. | all of the above |
| Answer» D. all of the above | |
| 834. |
metarials with characteristics have higher corrosion resistance |
| A. | purity |
| B. | coarse grained |
| C. | smooth surface |
| D. | all of the above |
| Answer» D. all of the above | |
| 835. |
during design and fabrication of the component, should be considered |
| A. | avoid the contact of dissimilar metals in the presence of |
| B. | when two dissimilar metals are to be in contact, anodic |
| C. | proper fabrication should be done to avoid |
| D. | all of the above |
| Answer» D. all of the above | |
| 836. |
during design and fabrication of the pipe and tanks, sharp bends and corners should be avoided because they form |
| A. | stagnant areas |
| B. | accumulation of solids |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 837. |
during design and fabrication of component, type of joints should be used |
| A. | welded |
| B. | bolted |
| C. | riveted |
| D. | all of the above |
| Answer» A. welded | |
| 838. |
during design and fabriaction of the component, a good design should have properties |
| A. | no crevices between adjacent areas |
| B. | free drainage and easy washings |
| C. | no chance for differential aeration corrosion |
| D. | all of the above |
| Answer» D. all of the above | |
| 839. |
in modification of corrosive environment, the corrosive nature of environment is reduced by |
| A. | removing the harmful components in the environment |
| B. | neutralising the effect of corrosive constituents of environment |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 840. |
modification of corrosive environment is done by technique |
| A. | deaeration |
| B. | deactivation |
| C. | dehumidifica tion |
| D. | all of the above |
| Answer» D. all of the above | |
| 841. |
in modification of corrosive environment, in oxygen concentrated cell, the technique of removel of oxygen from acqueous environmnet to reduce corrosion is called as |
| A. | deaeration |
| B. | deactivation |
| C. | dehumidifica tion |
| D. | all of the above |
| Answer» A. deaeration | |
| 842. |
in modification of corrosive environment, during technique, certain chemicals are added which combine rapildy with oxygen in acquous solution and reduce |
| A. | deaeration |
| B. | deactivation |
| C. | dehumidifica tion |
| D. | all of the above |
| Answer» B. deactivation | |
| 843. |
chemical is added during deactivation technique to modify corrosive environment |
| A. | sodium sulphite |
| B. | hydrazine hydrrate |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 844. |
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 |
| A. | deaeration |
| B. | deactivation |
| C. | dehumidifica tion |
| D. | all of the above |
| Answer» C. dehumidifica tion | |
| 845. |
substance which absobe moisture on its surface is used in dehumidification technique for midifiaction of corrosive environment |
| A. | alumina |
| B. | silica gel |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 846. |
method of corrosive prevention is useful only in closed areas like air conditioned shops, laboratories, computer rooms etc. |
| A. | deactivation |
| B. | dehumidifica tion |
| C. | alkaline neutralizatio n |
| D. | dearation |
| Answer» B. dehumidifica tion | |
| 847. |
method is used to prevent the corroive environmnet by neutralising the acidic character of corrosive conditions |
| A. | deactivation |
| B. | dehumidifica tion |
| C. | alkaline neutralizatio n |
| D. | dearation |
| Answer» C. alkaline neutralizatio n | |
| 848. |
substance is used in alkaline neutralization to prevent corrosive effect of environment |
| A. | nh3 |
| B. | naoh |
| C. | lime |
| D. | all of the above |
| Answer» D. all of the above | |
| 849. |
method of corrosion prevention has widely ued in controlling the corrosion of refinery equipments |
| A. | deactivation |
| B. | dehumidifica tion |
| C. | alkaline neutralizatio n |
| D. | dearation |
| Answer» C. alkaline neutralizatio n | |
| 850. |
in use of speacial alloys, alloying of with iron increase corrosion resitance |
| A. | cr |
| B. | ni |
| C. | both a and b |
| D. | tin |
| Answer» C. both a and b | |
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