Corrosion Pharmaceutical engineering MCQ with answers
Pharm Engg Chapterwise MCQ: UNIT-I MCQ * Flow of fluids * Size reduction * Size separation UNIT-II MCQ *Heat transfer *Distillation *Evaporation UNIT-III MCQ *Drying * Mixing UNIT-IV MCQ * Filtration * Centrifugation * UNIT-V MCQ Materials of construction * Corrosion
A severe form of corrosion that develops in highly localized areas of the metal surface is called as:
a. Erosion
b. Galvanic corrosion
c. Pitting corrosion
d. Stress corrosion
a. Erosion
b. Galvanic corrosion
c. Pitting corrosion
d. Stress corrosion
Answer: Pitting corrosion
The ability of a metal surface to withstand repeated cycles of corrosion is known as
a. Cavitation erosion
b. Corrosion fatigue
c. Erosion
d. Stress of corrosion cracking
a. Cavitation erosion
b. Corrosion fatigue
c. Erosion
d. Stress of corrosion cracking
Answer: Corrosion fatigue
Which one of the following CAN NOT be used to combat corrosion?
a. increasing the temperature of storage
b. pumping of inert gas into solution
c. removing air from boiler feed water
d. Shortening the time of exposure
a. increasing the temperature of storage
b. pumping of inert gas into solution
c. removing air from boiler feed water
d. Shortening the time of exposure
Answer: increasing the temperature of storage
One of the following types of corrosion is NOT related to liquid flow-related corrosion.
a. Cavitation erosion
b. Erosion
c. Fretting corrosion
d. Impingement corrosion
a. Cavitation erosion
b. Erosion
c. Fretting corrosion
d. Impingement corrosion
Answer: Fretting corrosion
Corrosion of metals is fairly high in one of the following mediums.
a. Acidic
b. Alkaline
c. Neutral
d. Non-aqueous
a. Acidic
b. Alkaline
c. Neutral
d. Non-aqueous
Answer: Acidic
Which one of the following types of corrosion of metals is flow related?
a. Biological corrosion
b. Crevice corrosion
c. Erosion
d. Inter-granular corrosion
a. Biological corrosion
b. Crevice corrosion
c. Erosion
d. Inter-granular corrosion
Answer: Erosion
For explaining dry corrosion of iron metal, which one of the following is necessary?
a. Chlorine
b. Hydrogen
c. Oxygen
d. Sulphur
a. Chlorine
b. Hydrogen
c. Oxygen
d. Sulphur
Answer: Oxygen
For chemical (dry) corrosion of iron, which one of the following conditions is necessary?
a. Connecting the metal through external wire
b. Hydrochloric acid solution
c. Sulphur dioxide gas
d. Sulphur dioxide solution
a. Connecting the metal through external wire
b. Hydrochloric acid solution
c. Sulphur dioxide gas
d. Sulphur dioxide solution
Answer: Sulphur dioxide gas
Galvanic corrosion is observed when an external electric current in the solution is passed between one of the following combinations.
a. Gold & platinum
b. Iron & hydrogen
c. Iron & iron
d. Zinc and copper
a. Gold & platinum
b. Iron & hydrogen
c. Iron & iron
d. Zinc and copper
Answer: Zinc and Copper
An increase in temperature does NOT enhance the extent of corrosion by one of the following conditions.
a. Diffusivity of the corroding medium
b. Solubility of the constituents of the metal in the corroding media
c. The thickness of the oxide film.
d. Volatility of the constituents of the metal
a. Diffusivity of the corroding medium
b. Solubility of the constituents of the metal in the corroding media
c. The thickness of the oxide film.
d. Volatility of the constituents of the metal
Answer: The thickness of the oxide film.
