ASNT LEVELIII-BASIC(MATERRIAL) 기출문제 자료

QUESTION BANK

BASIC EXAMINATION(C)




1. As metals are held at high temperature (to the melting point)

A. Grows B. Shrink

C. Melt D. Become gaseous




2. Slag inclusions in welds are primarily :

A. Entrapped water vapor and dense metals

B. Oxides and nonmetallic solids

C. Lime and silicon

D. Aluminizes and glassy metals




3. With which of the following is the term "Rockwell" associated ?

A. Index of metal machinability B. Tensile testing

C. Strain gauges D. Indentation hardness testing




4. Metal fatigue is most likely to be found in structures :

A. Loaded under constant high stress

B. Having undergone a substantial overload

C. Subject to cyclic, vibratory, or stress reversal lobes

D. Loaded in constant tension




5. Annealing is usually performed to :

A. Decrease hardness B. Increases ductility

C. Relieve stresses D. All of the above




6. Corrosion-resistant steels having relatively high percentages of nickel and chromium are called :

A. Aluminum alloys B. Forgings

C. Stainless steels D. Cast steels




7. A casting process used to produce hollow products like large pipes and hollow shafts is :

A. Submerged Arc welding B. Extrusion casting

C. Blow-melt cast D. Blow-melt castion

E. Centrifugal casting




8. In arc welding, the resultant weld deposit is essentially a :

A. Forged structure B. Cast structure

C. Rolled structure D. None of the above




9. Crack in metals emanating form fastener holes are :

A. Of minor consequence, because they are easy to detect nondestructively

B. Of minor consequence, because they seldom show

C. Of serious consequence, because they are difficult to detect and usually require removal of the fastener

D. Only present in structures subject to high static loads




10. Laminations in steel sheet are oriented :

A. Perpendicular with the principal surface of the sheet

B. Parallel with the principal surface of the sheet

C. At an angle with the principal surfaces of the sheet

D. At the mid-plane of the sheet




11. The color associated with temper film discoloration is :

A. Brown B. Blue

C. Purple D. Any of the above




12. Stresses remaining in metals after cold-working or rapid cooling are called :

A. Residual stress B. Strain-hardening

C. Cyclic stress D. Elastic stress




13. In which of the following might you not expect to find a seam ?

A. Forgings B. castings

C. Bar stock D. Sheet or plate material







14. An undesirable by-product of steel-marking processes is :

A. Slag B. Ingots

C. Chromium D. Flux




15. Metal corrosion that is accelerated when the metal is underloads is called :

A. Electrochemical corrosion B. Galvanization

C. Stress corrosion D. Electroplating




16. In its original shape, porosity in cast metal would appear :

A. Elongated B. Irregular

C. Round or nearly round D. Jagged




17. Monel and inconel are :

A. Magnesium alloys B. Nickel alloys

C. Beryllium alloys D. Tungsten alloys




18. The acronym EDM refers to :

A. Electrolytic dipolar machining B. Energy diatomic mixture

C. Electrolytic discharge machining D. Electrochemical machining




19. which of the following statements best differentiates between a defect and a discontinuity ?

A. Defect are the same as discontinuities

B. All discontinuities are rejectable

C. Discontinuities can propagate and become defects

D. Discontinuities cannot be detected with NDT method




20. With of the following is the term "anodizing" associated :

A. Surface treatment of stainless steel alloys

B. Metal surface cleaning

C. Surface treatment of aluminum alloys

D. Coated plastics




21. A heat treatment process used to relieve residual stresses in metals is called :

A. Tempering B. Carburization

C. Hardening D. Annealing




22. Severe grinding cracks appear as :

A. Wave-like patterns

B. Widely spaced cracks

C. Lattice-work or checkerboard pattern

D. Straight lines parallel to grinding wheel rotation




23. Shrinkage in an ingot during solidification results in the formation of a central cavity known as :

A. Segregation B. Hot top

C. Blow D. Pipe




24. The forging process often causes laps which sometimes can be mistaken for :

A. Bursts B. Pipe

C. Cracks D. Porosity




25. Select the statement that best describes corrosion.

A. Corrosion wearing away

B. Corrosion is a chemical process

C. Corrosion always results in pitting

D. Corrosion is not detrimental to visual examination




26. Strain gauge are commonly utilized to determine the amount of :

A. regional compression

B. local deformation

C. spot toughness

D. case hardness




27. Surface roughness measured as the arithmetical average deviation of height and form a mid-point is call the :

A. average waviness value

B. root mean square value

C. real surface deviation

D. lower lay limit




28. An ideal sampling plan should :

A. assume an 85% confidence level on 90% of the parts.

B. guarantee that all good lots are accepted and all bad lots are rejected.

C. represent the smallest sample possible give the required quality level.

D. be selected on non-random basis for 50% of the production items.




29. Which of the following flaws can be found in extrusions ?

A. shrinkage B. chevrons C. lamination D. flake




30. Which material property is determined by a charpy test ?

A. energy absorbing

B. hardness

C. tensile strength

D. production of area




31. A type of service failure occurring in metals at elevated temperature under constant load is referred to as :

A. fatigue

B. stress corrosion

C. creep

D. delayed crack




32. In a rotating shaft subjected to bending a change of section thick is a likely site for:

A. corrosion

B. fretting corrosion

C. fatigue crack

D. erosion-corrosion




33. Seeing in a most engineering material amount beyond their elastic limit normally produce

A. plastic flow

B. fracture

C. fatigue

D. crack


































ANSWER SHEET

BASIC EXAMINATION(MATERIAL)





1
A
11
D
21
D
31
C

2
B
12
A
22
C
32
C

3
D
13
D
23
D
33
A

4
C
14
A
24
C
-
-

5
D
15
C
25
B



6
C
16
C
26
B



7
E
17
B
27
B



8
B
18
C
28
C



9
C
19
C
29
B



10
B
20
C
30
A