Related Questions

Galvanic corrosion can not be prevented by
A Cathodic protection
B Anodic protection
C Usage of largest possible anodic area
D Any one of these
Corrosion in boilers can be prevented by
A Deaeration of feed water
B Enhancing pH of feed water by adding alkali
C Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
D All of the above
Corrosion involves exchange of electrons in __________ corrosion.
A Chemical
B Electrochemical
C Both A & B
D Neither A nor B
Which of the following metals in not used for coating of the base metal to guard it against corrosion?
A Lead
B Cadmium
C Magnesium
D Aluminium
In connection with corrosion of metals, passivation is the process that
A Intensifies deterioration
B Changes the composition of the metal
C Inhibits further deterioration
D None of these
With increase in impurities in metals, their corrosion resistances
A Increase
B Decrease
C Remain same
D May increase or decrease ; depending on the type of metal
Which of the following is an example of cathodic protection of metals against corrosion ?
A Painted steel
B Galvanised iron
C Case hardened steel
D Lead lined reactor
Atmospheric corrosion of metals result from their
A Slow oxidation
B Fast oxidation
C Fast hydration
D Slow dehydration
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is
A Cutting speed
B Feed rate
C Shear angle
D Tool geometry
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
A Mercury
B Arsenic
C Aluminium
D Lead

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