MODULE 20, CWB: STRUCTURE and PROPERTIES of METALS EXAM QUESTIONS WITH VERIFIED ANSWERS

MODULE 20, CWB: STRUCTURE and PROPERTIES of METALS EXAM QUESTIONS WITH VERIFIED ANSWERS 11. Which alloy elements used in steel that has the highest strengthening effect ? a. Chromium b. Copper c. Carbon d. Nickel - Answer-11. answer C, fig 8.2 12. Of all the strengthening methods available which one that simultaneously improves strength and toughness ? a. Grain refinement b. Precipitation hardening c. Strain aging d. Solid solution stregthening - Answer-12. answer A, sect 8.4.1 13. Effect of thickness on cooling rate on the thick plate does not depend on the thickness. True or False ? - Answer-13. asnwer True. sect 11.3.2.4 14. Heat input on a 12 mm steel plate cools ----------times more quickly than one for 6 mm plate. a. the same rate b. two c. four d. a few - Answer-14. answer C, sect 11.3.2.4 15. Fluxes or mixtures of compounds that do not mix with metals in the molten state are commonly used to shield weld metal. The composition of a flux depends on the metal for which it is being used, and usually designed to have a melting point -----------that of the metal.