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Engineering Materials - Interview Questions and Answers

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86. Acidic solution is one which has pH value
A. greater than 7
B. less than 7
C. equal to 7
D. pH value has nothing to do with neutral solution
E. none of the above.
Explanation:
87. The correct composition of Babbit metal is
A. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
C. 87% Sn, 4% Cu, 8% Sb, 1% Al
D. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
E. none of the above.
Explanation:
88. Austenite rs a combination of
A. ferrite and cementite
B. cementite and gamma iron
C. ferrite and austenite
D. ferrite and iron graphite
E. pearlite and ferrite.
Explanation:
89. Age-hardening is related with
A. stainless steel
B. gun metal
C. german silver
D. duralumin
E. cast iron.
Explanation:
90. A material is known as allotropic or polymorphic if it
A. has a fixed structure under all conditions
B. exists in several crystal forms at different temperatures
C. responds to heat treatment
D. has its atoms distributed in a random pattern
E. none of the above.
Explanation:
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