7000+ Metallurgy and Corrosion MCQ Questions and Answers - 1
Question: 1
Which metal is protected against corrosion by the layer of its own oxide?
(A) Aluminium
(B) Calcium
(C) Silver
(D) Iron
Ans: A
Aluminium
Question: 2
Ships operating in sea water are guarded against corrosion by
(A) Anodic coating
(B) Ceramic coating
(C) Cathodic protection
(D) Painting the outer surface
Ans: C
Cathodic protection
Question: 3
Deposition of aluminium vapour on metallic surface is called
(A) Hot dipping
(B) Electroplating
(C) Sherardising
(D) Calorising
Ans: D
Calorising
Question: 4
Erosion corrosion is encountered in
(A) Alkaline environment only
(B) Vibrating bearings
(C) Clamped/press fits
(D) Centrifugal pumps and steam turbines
Ans: D
Centrifugal pumps and steam turbines
Question: 5
Which is an example of cathodic protection?
(A) Case hardened steel
(B) Lead lined reactor
(C) Painted steel
(D) Galvanised iron
Ans: D
Galvanised iron
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