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Engineering :: Metallurgy


51.  In order to improve machinability of stainless steels
A. 0.2 percent selenium is added B. 0.35 percent sulphur is added
C. 0.5 percent manganese is added D. (A) and (B) above
E. (B) or (C) above    

52.  The highest percentage of chrommium that can be added to steel is usually
A. 12 percent B. 15 percent
C. 18 percent D. 25 percent
E. 50 percent    

53.  Carbon percentage in cutlery stainless steel is
A. 0.25 to 0.30 percent B. 0.76 to 0.80 percent
C. 1 percent D. 1.1 to 1.35 percent
E. 1.35 to 1.65 percent    

54.  An operation on steel aimed at softening the steel to improve machinability is known as
A. Softening B. Cold working
C. Shot blasting D. Annealing
E. Temperature    

55.  Annealing treatment is normally used for
A. Forgings B. Cold worked sheets
C. Wires D. Castings
E. All of the above    

56.  Chromium percentage in cutlery stainless steel is
A. 6 - 8 percent B. 8 - 10 percent
C. 11 - 13 percent D. 15 - 18 percent
E. 18 - 20.5 percent    

57.  Which of the following gives a fracture crystalline in appearance?
A. Steel B. Wrought iron
C. Cast iron D. All of the above
E. None of the above    

58.  Persence of lead in brass improves
A. Machining properties B. Hardenability
C. Ductility D. Malleability
E. Fatigue resistance    

59.  Iron ore which is grey to black in colour and is hard and magnetic, is known as
A. Hematite B. Limonite
C. Siderite D. Magnetite
E. Ironite    

60.  Which iron ore has least percentage of iron
A. Magnetite B. Hematite
C. Limonite D. Siderite
E. All have almost equal percentage of iron ore    




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