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Engineering Materials - Interview Questions and Answers

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36. Alnico, an alloy used extensively for per-manent magnets contains iron, nickel, aluminium and cobalt in the following ratio
A. 50 : 20 : 20 : 10
B. 40 : 30 : 20 : 10
C. 50 : 20 : 10 : 20
D. 30 : 20 : 30 : 20
E. 50 : 10 : 20 : 20.
Explanation:
37. Bell metal contains
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 70-75% copper and rest zinc and tin.
Explanation:
38. Brass contains
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 70% copper and 30% tin.
Explanation:
39. Preheating is essential in welding
A. cast iron
B. high speed steel
C. all non-ferrous materials
D. all of the above
E. none of the above.
Explanation:
40. Corrosion resistance of steel is increased by adding
A. chromium and nickel
B. nickel and molybdenum
C. aluminium and zinc
D. tungsten and sulphur
E. none of the above.
Explanation:
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