Q.1
Which of the following is/are true regarding seawater?
  • a) It contains 3.4% salt
  • b) It has a pH around 8
  • c) It is a good electrolyte with high electrical conductivity
  • d) Seawater is a good electrolyte with high electrical conductivity with 3.4% salt and pH around 8
Q.2
Which of the following is/are the factors that affect corrosion in seawater?
  • a) Temperature and velocity
  • b) Oxygen content and biological organisms
  • c) Temperature, velocity, oxygen content and biological organisms
  • d) Temperature, velocity and oxygen content
Q.3
Which of the following region of the seacoast environment have high corrosion based on the given figure?
  • a) Quiet seawater
  • b) Splash region
  • c) High tide area
  • d) Mud line
Q.4
Which of the following regions of the seacoast environment shows the effect of the pitting of metals and alloys?
  • a) Quiet seawater
  • b) High tide region
  • c) Low tide region
  • d) Splash region
Q.5
Corrosion by seawater at greater depth is usually decreased because of the lower temperature.
  • a) False
  • b) True
Q.6
Which of the following impurities contaminates the brackish water due to tidal action in rivers and bays near the ocean?
  • a) Chlorides
  • b) Bromides
  • c) Hydrides
  • d) Metal oxides
Q.7
Which of the following metals have high resistance to crevices in quiet seawater?
  • a) Hastelloy C
  • b) Titanium
  • c) Hastelloy C and Titanium
  • d) Nickel-copper alloy
Q.8
Which of the following alloy has high cavitation resistance that usually used for ship propellers and pumps impellers in seawater?
  • a) Titanium
  • b) Stellite
  • c) 17-7 Stainless steel
  • d) Nickel aluminum bronze
Q.9
Which of the following factors that affect the corrosivity in freshwater?
  • a) Oxygen content
  • b) Hardness
  • c) Chloride content
  • d) Oxygen content, hardness and chloride content
Q.10
Which of the following type of water is more corrosive?
  • a) Hard water
  • b) Hard and soft water
  • c) Soft water
  • d) High-purity water
Q.11
Which of the following metals are widely used for handing freshwater?
  • a) Cast iron
  • b) Stainless steel
  • c) Galvanized steel
  • d) Cast iron, stainless steel, and galvanized steel
Q.12
Which of the following corrosion defects that affect the reliability of tubing?
  • a) Selective weld metal attack
  • b) Improper pickling and heat treatment
  • c) Residual stresses, selective weld metal attack, improper pickling, and heat treatment
  • d) Selective weld metal attack and residual stresses
Q.13
Corrosion decreases with an increase in the purity of water.
  • a) True
  • b) False
Q.14
Which of the following types of corrosion has been seen in stainless steels in high purity water containing oxygen?
  • a) Cracking of solution-quenched stainless steel only
  • b) Intergranular attack and cracking of solution-quenched steel
  • c) Intergranular attack only
  • d) Neither intergranular corrosion nor cracking of solution-quenched steel
Q.15
Which of the following metals/alloys are used for handling high-purity water in nuclear applications?
  • a) Zirconium and its alloys
  • b) Stainless steels
  • c) Inconel and Incoloy
  • d) Zirconium and its alloys, stainless steels, Inconel and Incoloy
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