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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