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Engineering Materials - Interview Questions and Answers

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76. Addition of lead and bismuth to aluminium results in
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above.
Explanation:
77. Perminvar alloy having constant permeability is an alloy of
A. nickel, copper and iron
B. nickel, copper and zinc
C. copper, nickel and antimony
D. iron, zinc and bismuth
E. antimony, copper and zinc.
Explanation:
78. DuraJomin contains
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 94% aluminium and 6% tin.
Explanation:
79. Stress relaxation is- the phenomenon
A. in which parts are not loaded
B. in which stress remains constant on increasing load
C. in which deformation tends to loosen the joint and produces a stress reduced
D. stress reduces on increasing load
E. none of the above.
Explanation:
80. Aluminium bronze contains
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 10% aluminium and 90% tin.
Explanation:
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