Engineering :: Metallurgy
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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 |
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Answer: Option D
Explanation:
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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 |
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Answer: Option C
Explanation:
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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 |
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Answer: Option A
Explanation:
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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 |
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Answer: Option D
Explanation:
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55. |
Annealing treatment is normally used for |
A. |
Forgings |
B. |
Cold worked sheets |
C. |
Wires |
D. |
Castings |
E. |
All of the above |
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Answer: Option E
Explanation:
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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 |
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Answer: Option B
Explanation:
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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 |
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Answer: Option C
Explanation:
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58. |
Persence of lead in brass improves |
A. |
Machining properties |
B. |
Hardenability |
C. |
Ductility |
D. |
Malleability |
E. |
Fatigue resistance |
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Answer: Option A
Explanation:
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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 |
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Answer: Option D
Explanation:
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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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Answer: Option D
Explanation:
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