MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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» D. none of the above | |
| 2. |
Liquid Penetrant Test is based on thePrinciple of |
| A. | gravity |
| B. | capillarity |
| C. | partial pressure |
| D. | expansion |
| Answer» C. partial pressure | |
| 3. |
in body centred crystal structure, there is number of corner atoms |
| A. | 1 |
| B. | 4 |
| C. | 8 |
| Answer» D. | |
| 4. |
is maximum value of stress upto which stress is directly proportional to strain |
| A. | elastic limit |
| B. | proportionallimit |
| C. | yield stress |
| D. | all of the above |
| Answer» C. yield stress | |
| 5. |
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» D. dearation | |
| 6. |
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» E. | |
| 7. |
the plastic deformation takes place due toand |
| A. | slip |
| B. | twin |
| C. | both of the above |
| D. | none of the above |
| Answer» D. none of the above | |
| 8. |
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» D. dearation | |
| 9. |
in body centered cubic structure the center atom is shared by adjacent unit cells |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| Answer» E. | |
| 10. |
FCC structure have APF (Atomic Packing Factor) of ….. |
| A. | 0.74 |
| B. | 0.52 |
| C. | 0.68 |
| D. | 0.8 |
| Answer» B. 0.52 | |
| 11. |
Density of material depends on ….. |
| A. | no.of atoms/unit cell |
| B. | atomic packing factor |
| C. | coordinatio n number |
| D. | both a&b |
| Answer» E. | |
| 12. |
Which of the following Statement is false :-MPT detects |
| A. | surface defects |
| B. | subsurface defects |
| C. | internal defects |
| D. | both a & b |
| Answer» D. both a & b | |
| 13. |
this is type of slip systems. |
| A. | glide |
| B. | slip |
| C. | twinns |
| D. | none of the above |
| Answer» B. slip | |
| 14. |
(a√3)/4 is the radius of |
| A. | sc |
| B. | bcc |
| C. | fcc |
| D. | hcp |
| Answer» C. fcc | |
| 15. |
in simple cubic crystal structure there arenumber of corner atoms |
| A. | 1 |
| B. | 4 |
| C. | 8 |
| Answer» D. | |
| 16. |
Ligancy of FCC structure are….. |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 12 |
| Answer» E. | |
| 17. |
Mechanical stressing of crystal structure -------- conductivity of metal. |
| A. | decreases |
| B. | increases |
| C. | less |
| D. | none of the above |
| Answer» B. increases | |
| 18. |
is the tangent to the angulardistortion |
| A. | true strain |
| B. | engineeringstrain |
| C. | shear strain |
| D. | none of theabove |
| Answer» D. none of theabove | |
| 19. |
states that geometrically similar samples having constant L/D ratio shows same % elongation |
| A. | hooke\s law |
| B. | barba\s law |
| C. | newton\slaw |
| D. | none of theabove |
| Answer» C. newton\slaw | |
| 20. |
compression test is carried on machine |
| A. | universal testing |
| B. | impact testing |
| C. | fatigue testing |
| D. | torsion testing |
| Answer» B. impact testing | |
| 21. |
HCP structure have APF (Atomic Packing Factor) of ….. |
| A. | 0.74 |
| B. | 0.52 |
| C. | 0.68 |
| D. | 0.8 |
| Answer» B. 0.52 | |
| 22. |
The critically resolved shear stress Tcr=(P cos α cos β)/A . the equation known as.....law. |
| A. | bragg\s |
| B. | schmid\s |
| C. | bauchinger\ s |
| D. | none |
| Answer» C. bauchinger\ s | |
| 23. |
new grain formation take place in stage of annealing treatment |
| A. | recovery |
| B. | grain growth |
| C. | recrystalliza tion |
| D. | none of the above |
| Answer» D. none of the above | |
| 24. |
The plane (1⎯ 11) is parallel to |
| A. | (-11-1) |
| B. | (-1-11) |
| C. | -111 |
| D. | (1-11) |
| Answer» B. (-1-11) | |
| 25. |
Poor surface finish in………process |
| A. | cold working |
| B. | hot working |
| C. | casting |
| D. | welding |
| Answer» C. casting | |
| 26. |
diffusion implies atomic movement along the surface of a plane |
| A. | atomic |
| B. | surface |
| C. | volume |
| D. | grain boundary |
| Answer» C. volume | |
| 27. |
is a type of cathodic protection to prevent corrosion |
| A. | sacrificial anodic or galvanic protection |
| B. | impressed current cathodic protection |
| C. | both a and b |
| D. | none of th e above |
| Answer» D. none of th e above | |
| 28. |
a crystalline material has atoms in ordered location which is |
| A. | random, non repetitive |
| B. | perfect, repetitive |
| C. | perfect, non repetitive |
| D. | none of the above |
| Answer» C. perfect, non repetitive | |
| 29. |
in charpy test, specimen with notch is used |
| A. | key hole |
| B. | u |
| C. | v |
| D. | all of the above |
| Answer» E. | |
| 30. |
mechannnial properties of the metalafter plastic deformation |
| A. | increases |
| B. | either increase or decrease |
| C. | remains constant |
| D. | none of the above |
| Answer» C. remains constant | |
| 31. |
The lattice above the dislocation line is in in negative edge dislocations |
| A. | tension |
| B. | shear |
| C. | compression |
| D. | all |
| Answer» B. shear | |
| 32. |
Internal Discontinuities in the shaft for elctricmotor can be checked by |
| A. | ultrasonic testing |
| B. | dye penetrant test |
| C. | magnetic particle test |
| D. | eddy currenttest |
| Answer» B. dye penetrant test | |
| 33. |
Time of travel of waves from the defect is……for Pulse Echo method |
| A. | more |
| B. | less |
| C. | 1/4 of the total time |
| D. | 1/3 of the toal time |
| Answer» C. 1/4 of the total time | |
| 34. |
Tensional effect is observed in componentslike |
| A. | gears |
| B. | shafts |
| C. | axles |
| D. | all of the above |
| Answer» E. | |
| 35. |
dislocations can glide only |
| A. | screw |
| B. | edge |
| C. | twinning |
| D. | cross |
| Answer» B. edge | |
| 36. |
one of the following corrosive gas, possess a lowest corrosion rat, with respect to carbon steels, than any other gases? |
| A. | co2 |
| B. | o2 |
| C. | h2s |
| D. | h2 |
| Answer» D. h2 | |
| 37. |
one of the following corrosive gas, possess a highest corrosion rate, withrespect to carbon steels ? |
| A. | co2 |
| B. | o2 |
| C. | h2s |
| D. | h2 |
| Answer» C. h2s | |
| 38. |
one of the following is a corrosive gas, which corrode the metal very fast |
| A. | o2 |
| B. | co2 |
| C. | h2s |
| D. | all of the above |
| Answer» E. | |
| 39. |
one of the following is a corrosion resistance alloy |
| A. | stainless steel |
| B. | nickel base alloys |
| C. | cobalt base alloys |
| D. | all of the above |
| Answer» E. | |
| 40. |
dehydration is nothing but |
| A. | removal of metal |
| B. | removal of water |
| C. | removal of matter |
| D. | none of the above |
| Answer» C. removal of matter | |
| 41. |
anodes are dissolving in case of impressed current method, which is one of the cathodic protection method. This statement is |
| A. | false |
| B. | true |
| C. | not applicable to it |
| D. | none of the above |
| Answer» B. true | |
| 42. |
dehydration means removal of water from the system, to control corrosion . This |
| A. | true |
| B. | false |
| C. | not applicable to |
| D. | none of the above |
| Answer» B. false | |
| 43. |
anodes are dissolving in case of sacrificial anode method which is one of the cathodic protectionmethod. This statement is |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» B. false | |
| 44. |
one of the following is the main advantage of impressed current method |
| A. | applicable to large objects |
| B. | uncoated parts can be protect |
| C. | can protect underground steel structure |
| D. | all of the above |
| Answer» E. | |
| 45. |
one of the following is a main advantage of sacrificial anode method |
| A. | external power supply is not required |
| B. | minimum maintenance |
| C. | very easy to operate |
| D. | all of the above |
| Answer» E. | |
| 46. |
one of the following processes is a cathodic protection method. |
| A. | hot dipping |
| B. | electroplatin g |
| C. | impresssed current |
| D. | phosphating |
| Answer» D. phosphating | |
| 47. |
in cathodic protection, it protects the metal by coating it with a suitable method. This statement is -- |
| A. | true |
| B. | false |
| C. | not applicable to it |
| D. | none of the above |
| Answer» C. not applicable to it | |
| 48. |
one of the following is inhibitor which is used in metal protection. |
| A. | zinc |
| B. | aluminium |
| C. | copper |
| D. | none of the above |
| Answer» E. | |
| 49. |
the corrosion inhibitor work by one of following mechanisms |
| A. | they form precipitate and coat the metal |
| B. | they combine with corrosion product films |
| C. | they absorb on metal surface |
| D. | all of the above |
| Answer» E. | |
| 50. |
one of the following is the main application of corrosion inhibitors |
| A. | power plant |
| B. | engine coolin g system |
| C. | pipeline carrying hydrocarbon s |
| D. | none of the above |
| Answer» E. | |