Welding Quiz 1.docx

1、Welding Quiz 1Welding Quiz 1( Materials )1. Steel is an alloy of a. Chromium and Iron b. Sulphur and Phosphorus c. Iron and Carbon d. Manganese and Nickel2. High Carbon steel will have Carbon % a. less than0.1b. between 0.3 to 0.5 c. 0.25 maxd. greater than 0.53. Increase in carbon % will:a. increas

2、e hardness and strengthb. improve ductility and toughnessc. reduce weldabilityd. a&c4.Which one of the following statement is correct?a. preheating increases hardness b. preheating increases shrinkage stressc. preheating increases cooling timed. preheating increases welding output5. What is the most

3、 common carbon steel material used for boilers and pressure vessels?a. High carbon steelb. Low carbon steelc. Medium carbon steeld. all of above6. Interpass temperature is the max temperature to be controlled while welding. Statement is :a. Trueb. False7. Postheating of weld is applied:a. immediatel

4、y after weldingb. before weldingc. during weldingd. none of the above8.Hydrogen cracks in the weld HAZ is likely to occur when welding:a. low carbon steelb. austenitic stainless steelc. chrome-moly steeld. weathering steel9. What is the minimum % of chromium required to make the steel stainlessa. 1

5、c. 11b. 5 d. 910. The main reason for preheating of medium carbon steel and chrome-moly steel before gas cutting is to:a. improve quality of cutb. increase speed of cuttingc. prevent hardening and crackingd. refine grain structure11. Charpy test is conducted to measure:a. hardnessb. strengthc. tough

6、nessd. fatigue 12. Adddition of Cr, Mo, V to steel improvesa. notch toughnessb. creep propertiesc. corrosion resistanced. all of above13. Excessive preheat and interpass temperature during welding on high strength low alloy steel will result in:a. cracksb. porosityc. reduction in mechanical properti

7、esd. no affect14. Rust is formed form Iron and which other element?a. Hydrogen b. sulphur c. Oxygen d. nitrogen15. Cold working of steel will result in a. improved corrosion resistanceb. increased hardness c. improved ductilityd. reduction in strength16. Which metal is used for galvanizing?a. chrome

8、b. Leadc. Tind. Zinc17. which one of the stainless steel doesnot normally require preheat for weldinga. austeniticb. ferriticc. matenisticd. none of above18. rapid cooling of a steel from austenitic range results in a hard brittle structure known as a. pearliteb. ferritec. martensited.bainite19. Whi

9、ch of the following changes will require increase in preheat?a. decreased carbon equivalent c. increased thicknessb. increased carbon equivalent d. b&c20. What heat treatment is characterized by holding the part at austenising temp for sometime and then slow cooling in the furnace?a. normalizingb. q

10、uenchingc. annealingd. stress relieving21. Which of the following generally follows quenching?a. annealingb. temperingc. normalizingd. stress relieving22. Heat input can be increased by:a. increasing currentb. reducing currentc. increasing speedd. reducing voltage23. calculate carbon equivalent usin

11、g formula CE= %C +%Mn/6 + %(Cr+Mo+V)/5 + %(Ni+Cu)/15a. 0.4 b. 0.6 c. 0.2 d. 0.824. Increase of heat input for austenitic SS welding will result in:a. improved corrosion resistanceb. increase in carbide precipitationc. decrease in corrosion resistanced. a&c25. Ferrite in austenitic SS weld can be cal

12、culated using:a. WRC 92 diagramb. Ferritoscopec. chemical analysisd. all of above26. Duplex SS is better than austenitic SS for chloride environment. Statement is:a.Trueb. False27. Increase in ferrite content of austenitic SS weld will result in:a. lowering of corrosion resistanceb. improving corros

13、ion resistancec. no effectd. poor weldability28. Dilution in overlay welding can be reduced by;a. increasing the speedb. increasing the currentc. increasing the voltaged. decreasing the speed29. Which is the best arc welding process for cladding of steel?a. SMAWb. GTAWc. SAW- wired. SAW- Strips30. o

14、verlapping of weld beads increases dilution: Statement isa. Trueb. False31. Ferrous material specifications are listed in:a. ASME section IXb. ASME Section IIAc. ASME section IIBd. ASME section V32. Which of the element is not a ferrite former?a. Carbonb. Chromiumc. Molybdenumd. Niobium33. Which SS

15、category has dual structure?a. austenitic c. duplexb. ferritic d. martenstic34. Sensitisation of austenitic SS is enhanced by:a. increasing carbon contentb. addition of stabilizing element like Ti, Cbc. reducing the heat inputd. decreasing the carbon content35. What is the expansion for term “ PREN”

16、?a. Positive Ratio Equal Numbersb. Positive Resistance equal numberc. Pitting resistance Equivalent Numberd. Pitting ratio equivalent number36. Which of the following element does not have effect on PREN?a. Chromiumb. Molybdenumc. Nitrogend. Nickel37. Higher the PREN higher is the pitting resistance

17、. Statement isa. Falseb. True38. Bonding strength of clad plate is evaluated by :a. Bend test c. shear testb. tensile test d. compression te39. Which is an undesirable impurity in steel?a. Carbonb. manganesec. silicond. Sulphur40. Steel with 3% carbon is known as:a. High carbon steelb. Cast ironc. C

18、ast steeld. medium carbon steel41. PWHT of equipment as per code is carried out by:a. normalizingb. temperingc. stress relievingd. annealing42. Low alloy steel has alloying elements:a. 25%b. 10 %d. 15%43. Steel welds should be protected from:a. Nitrogen, oxygen, hydrogenb. Argonc. Heliumd. b&c44. St

19、ainless steel welds require cooling between passes because:a. temperature build could induce hot crackingb. Cooling the weld reduces solubility of hydrogenc. Cooling promotes precipitation of chromium carbidesd. weld metal will not solidify properly.45. which one of the following is a ferrous metal?

20、a. Aluminumb. Copper.C. low alloy steeld. Nickel46. Major difference between quenching and annealing process is :a. temperature to which alloy is heatedb. soaking timec. cooling rated. heating medium47. Small amount of ferrite in austenitic weld:a. increases weld crackingb. decreases weld crackingc.

21、 has no affect48. Which of the following can be accomplished using either thermal or mechanical techniques? a. annealing b. stress relieving c. normalizing d. quenching49. The four categories of SS derive their respective names from:a. the man who discovered themb. the crystal structure usually found in them at room temperaturec. their appearanced. their mechanical properties50. The use of preheat will tend to:a. result in a wider HAZb. produce a lower hardness in HAZc. slow down the cooling rated. all of the above