41. Fatigue strength of a material increases by
42. Which of the following alloy steels is the most suitable for making gun barrels and projectiles?
43. Gun metal is an alloy of
44. Which is the purest form of iron?
45. Pick out the wrong statement.
46. High speed steel should have high
47. High carbon steel contains more than __________ percent carbon.
48. Which of the following exercises most powerful influence on the mechanical properties of steel?
49. Hardened steel is softened by
50. Which of the following has the poorest weldability?
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