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


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


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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