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Corrosion Engineering
Corrosion Engineering Written Test
Quiz 1
Solution
Q.1.
The liquid-metal corrosion is usually a physical effect rather than an electrochemical attack.
a) True
b) False
Q.2.
Which of the following is/are the types of liquid-metal corrosion?
a) Solution of structural metal
b) Diffusion of liquid into solid metal
c) Intermetallic compound formation
d) Solution of structural metal, diffusion of liquid into solid metal and intermetallic compound formation
Q.3.
Which of the following is/are undesirable in heat-exchange systems handling liquid metals?
a) Deposition of impurities in cool areas
b) Resistance to heat transfer
c) Formation of brittle intermetallic compounds, resistance to heat transfer and deposition of impurities in cool areas
d) Formation of brittle intermetallic compounds
Q.4.
Which of the following parameter has a direct relation with the corrosion rate in liquid metals?
a) Percentage of alloying elements
b) Solubility of the metallic structure in liquid metal
c) Solubility of alloying elements in metallic matrix
d) Percentage of oxygen
Q.5.
Which of the following parameter is taken as Xin the given graph regarding corrosion of various metals in liquid-metal corrosion?
a) Atomic weight
b) Weight loss
c) Solubility percentage
d) Atomic number
Q.6.
Which of the following materials shows good resistance to both liquid-metals and high-temperature oxidation?
a) High alloy stainless steels
b) Monel
c) Hastelloy
d) Hastelloy, high alloy stainless steels and monel
Q.7.
Which of the following type of stainless steels are attacked by magnesium at its melting point?
a) Duplex stainless steels
b) Austenitic stainless steels
c) Martensitic stainless steels
d) Ferritic stainless steels
Q.8.
The presence of traces of titanium and magnesium in mercury can inhibit the corrosion of iron in ferrous-based alloys.
a) True
b) False
Q.9.
Which of the following materials have superior corrosion resistance and high rupture strength in mercury?
a) 5% chromium steels
b) Si-Cr-Mo steels
c) 5% chromium steels and Si-Cr-Mo steels
d) Carbon steels
Q.10.
Which of the following type of corrosion Is usually encounters for various materials in liquid metal environment?
a) Uniform corrosion
b) Stress cracking corrosion
c) Crevice corrosion
d) Pitting corrosion
Q.11.
Which of the following alloys is/are usually used for sodium hydroxide fused salt?
a) Nickel-based alloys
b) Copper-based alloys
c) Ferrous alloys
d) Zinc based alloys
Q.12.
Which of the following is/are the types of mass transfer due to liquid-metal corrosion?
a) Composition-gradient mass transfer
b) Thermal-gradient mass transfer
c) Neither composition nor thermal gradient mass transfer
d) Both composition and thermal gradient mass transfer
Q.13.
Which of the following types of steel coatings is/are preferred for automobile body parts?
a) Galvanized steels
b) Electroplated steels
c) Galvanized steels, electroplated steels and complete immersion of corrosion preventing primer coat
d) Complete immersion of corrosion preventing primer coat
Q.14.
Which of the following is/are preventive measures to minimize automobile corrosion?
a) Use of inhibitor in the engine cooling system
b) Avoid very short runs
c) Fill the gasoline tank at least half full
d) Use of inhibitor in engine cooling system, avoid very short runs and fill the gasoline tank at least half full
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