Electrometallurgy and Corrosion Quiz Questions Pdf - 1

Question: 1

Which is most prone to corrosive attack?

(A) Metals with slag inclusions

(B) Metals with high level of impurities

(C) Metal lowest in the emf series

(D) Metal highest in the emf series

Question: 2

Erosion corrosion is not caused

(A) In impellers of pumps and turbines

(B) By cavitation

(C) By stagnant solution

(D) By turbulent flow of fluids

Question: 3

Coating of iron with zinc protects it against corrosion, because

(A) Zinc has a higher melting point than iron

(B) Iron has a higher melting point than iron

(C) Zinc is less noble than iron (in electrochemical series of metal)

(D) Iron is less noble than zinc

Question: 4

Galvanic corrosion

(A) Occurs in highly stresses metallic parts only

(B) Occurs in a bimetal couple

(C) Is exemplified by caustic embrittlement of boiler tubes

(D) Is also called dezincification

Question: 5

Electrolytes conduct electric current by the movement of

(A) Electric charges through them

(B) Electrons through them from cathode to anode

(C) Molecules

(D) Ions