Question 16 The hardness of steel depends upon the O amount of cementite it contains O contents of alloying elements O amount of carbon it contains method of manufacture of steel Question 17 Percentage elongation during tensile test is indication of O Ductility O Malleability O Creep O Toughness Question 18 Cold work is Deformation at high temperature Heating up materials Cooling materials Room temperature deformation Question 19 Which of the following sentences are true for jigs and fixtures? 1. Using jigs and fixture produce work rapidly ii. High speed, feed and depth of cut can be used in machining with the help of jigs and fixtures iii. Jigs and fixture cannot be used in machining of complex and heavy components (i) and (ii) (ii) and (iii) (i) and (iii) All the (i), (ii) and (iii) Question 20 Chromium has a BCC crystal structure. How many chromium atoms are in each unit cell? 4 6 2