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Mechanical Engineering Objective Questions { Material Science }



43. Hardness of steel depends on
A.Amount of carbon it contains
B.The shape and distribution of the carbides in iron
C.Method of fabrication
D.Contents of alloying elements

44. Maximum percentage of carbon in ferrite is
A.0.025%
B.0.06%
C.0.1%
D.0.25%

45. Maximum percentage of carbon in austenite is
A.0.025%
B.0.26%
C.0.8%
D.1.7%

46. Corrosion resistance of steel is increased by addition of
A.Chromium and nickel
B.Sulphur, phosphorus, lead
C.Vanadium, aluminium
D.Tungsten, molybdenum, vanadium, chromium

47. In which of the following cases, consideration of creep is important
A.Flywheel of steam engine
B.Cast iron pipes
C.Cycle chains
D.Gas turbine blades

48. The most effective inhibitor of grain growth, when added in small quantities is
A.Carbon
B.Vanadium
C.Manganese
D.Cobalt

49. Depth of hardness of steel is increased by addition of
A.Nickel
B.Chromium
C.Tungsten
D.Vanadium

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