Electrometallurgy and Corrosion Quiz Questions Pdf - 2

Question: 6

Fretting corrosion is

(A) A uniform corrosion

(B) A purely mechanical phenomenon

(C) A purely chemical phenomenon

(D) Liable to occur, where close fitting machine parts are subjected to vibrational stresses

Question: 7

Which of the following is an invalid cathode anode combination?

(A) Zinc-silver

(B) Tin-iron

(C) Iron-zinc

(D) Titanium-nickel

Question: 8

The plated iron and galvanized iron are generally produced by

(A) Hot dipping

(B) Electroplating

(C) Spraying

(D) Vapourising

Question: 9

Rate of corrosion in metal is accelerated by the

(A) Applied or residual stresses in it

(B) Decrease in its temperature

(C) Reduction in current flow through it

(D) Flow of alternating current through it

Question: 10

Pitting corrosion is

(A) Due to homogeneities in metals

(B) A result of chemical reaction

(C) A result of electrochemical reaction

(D) A uniform corrosion