Q.1
Which of the following method is adopted for preventing corrosion by acids?
  • a) Deaeration
  • b) Removal by using ion-exchange resin
  • c) Neutralisation with lime
  • d) Dehumidification
Q.2
Which of the following method is adopted for preventing corrosion by salts?
  • a) Deaeration
  • b) Removal by using ion-exchange resin
  • c) Neutralisation with lime
  • d) Dehumidification
Q.3
Which of the following method is adopted for preventing corrosion by moisture?
  • a) Deaeration
  • b) Removal by using ion-exchange resin
  • c) Neutralisation with lime
  • d) Dehumidification
Q.4
The organic or inorganic substances which when added to the environment are able to reduce the rate of corrosion are called ___________
  • a) Inhibitors
  • b) Stimulants
  • c) Insulators
  • d) Stipulator
Q.5
Which of the following readily sublime and form a protective layer on the metal surface?
  • a) Anodic inhibitor
  • b) Cathodic inhibitor
  • c) Volatile inhibitors
  • d) Non-volatile inhibitors
Q.6
Which of the following is not an anodic inhibitor?
  • a) Alkalis
  • b) Molybdates
  • c) Phosphates
  • d) Dicyclohexyl ammonium nitrile
Q.7
The process by which Ta, Nb and Ti combine with carbon to form respective carbides and prevent corrosion is known as ___________
  • a) Passivation
  • b) Neutralisation
  • c) Inhibition
  • d) Stimulation
Q.8
The process which lowers the content of sulphur and phosphorus in steels is known as ___________
  • a) Refining
  • b) Passivation
  • c) Inhibition
  • d) Stimulation
Q.9
Annealing is a heat treatment given to metals to ___________
  • a) Prevent dezincification
  • b) Remove the residual stresses
  • c) Lower the sulphur content
  • d) Form a protective layer
Q.10
Anodised oxide coatings are used for the protection of Al, Zn, Mg and their alloys from corrosion.
  • a) True
  • b) False
Q.11
Which of the following statement is incorrect about the anodic coating?
  • a) Protects the metal from corrosion sacrificially
  • b) Base metal is not corroded
  • c) Example- coating of tin on iron
  • d) No negative consequence
Q.12
Organic coating is inert organic barrier whose protective value depends upon its impermeability to gases, salts and water.
  • a) True
  • b) False
Q.13
Electrochemical protection is ___________
  • a) Anodic protection
  • b) Sacrificial Anodic protection
  • c) Impressed current cathodic protection
  • d) Cathodic protection
Q.14
Magnesium is used in high resistivity electrolytes due to its ___________
  • a) Neutral potential
  • b) Most positive potential
  • c) Most negative potential
  • d) Zero potential
Q.15
Which of the following metal is not used as a sacrificial anode?
  • a) Zinc
  • b) Copper
  • c) Magnesium
  • d) Aluminium
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