Coatings MCQs : This section focuses on the "Coatings". These Multiple Choice Questions (MCQs) should be practiced to improve the Coatings skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A thin coating of metallic and inorganic materials can provide a satisfactory barrier between the metal and its environment.
A. TRUE
B. FALSE
Question 2
Cladding is a great economical advantage in that the corrosion barrier as the expensive material is backed up by inexpensive material by minimizing corrosion.
A. TRUE
B. FALSE
Question 3
In general, coatings should not be used where the environment would rapidly attack the substrate material.
A. TRUE
B. FALSE
Question 4
What is meant by chemical conversion regarding coatings of a metal?
A. Coating metal is vaporized electrically to deposit on the parts to be coated
B. Coatings produced by corroding the metal surface to form an adherent protective layer
C. Hot rolling of two metals together to produce composite sheet
D. A metal wire or powder through the melting flame is blown onto the surface to be protected
Question 5
What is meant by diffusion coatings?
A. Immersing native metal in a solution of the metal to be plated
B. Coating metal is vaporized electrically to deposit on the metals to be coated
C. Heat treatment to cause alloy formation by diffusion of one metal into the other
D. Hot rolling of two metals together to get a composite sheet
Question 6
What is meant by electrodeposition?
A. Immersing native metal in a solution of the metal to be plated
B. Hot rolling of two metals together to get a composite sheet
C. A wire or powder through melting flame is blown onto the surface to be protected
D. Coating metal is vaporized electrically to deposit on the metals to be coated
Question 7
What is meant by metal cladding?
A. Immersing native metal in a solution of the metal to be plated
B. Coating metal is vaporized electrically to deposit on the metals to be coated
C. Hot rolling of two metals together to get a composite sheet
D. A wire or powder through melting flame is blown onto the surface to be protected
Question 8
What is meant by vapor deposition?
A. A wire or powder through melting flame is blown onto the surface to be protected
B. Coating metal is vaporized electrically to deposit on the metals to be coated
C. Hot rolling of two metals together to get a composite sheet
D. Immersing native metal in a solution of the metal to be plated
Question 9
What is meant flame spraying metallic coating?
A. Hot rolling of two metals together to get a composite sheet
B. A wire or powder through melting flame is blown onto the surface to be protected
C. Coating metal is vaporized electrically to deposit on the metals to be coated
D. Immersing native metal in a solution of the metal to be plated
Question 10
What is the general purpose of each coating in a three-layered coating of an automobile bumper?
A. Inner coating – adhesion, intermediate coating – corrosion protection and top layer – appearance
B. Inner coating – corrosion protection, intermediate coating – adhesion and top layer – appearance
C. All layers for corrosion resistance
D. All layers for appearance
Question 11
What is the purpose of surface preparation?
A. Surface roughening for mechanical bonding
B. Removal of dirt, rust and mill scale
C. Removal of welding flux and other impurities
D. Surface roughening for mechanical bonding, removal of dirt, rust, mill scale, welding flux, and other impurities
Question 12
What is the reason for the localized attack on the base metal due to the porosity of coatings?
A. Crevice formation
B. Galvanic effect
C. Initiation of pits
D. Crevice formation and galvanic effect
Question 13
Which of the following is/are the advantages of coal-tar coatings?
A. Excellent corrosion resistance to fresh and seawater
B. Excellent corrosion resistant to fresh, seawater and soil immersion
C. High abrasive resistance
D. Stable coating
Question 14
Which of the following is/are the application of flame spraying?
A. Bridges
B. Refrigeration equipment
C. Ship hulls
D. Bridges, refrigeration equipment and ship hulls
Question 15
Which of the following is/are the examples for metal-coated articles?
A. Silverware
B. Galvanized steel
C. Tin cans
D. Silverware, galvanized steel, and tin cans
Question 16
Which of the following is/are the examples of chemical conversion?
A. Bonderizing
B. Parkerizing
C. Chromatizing
D. Bonderizing, parkerizing, and chromatizing
Question 17
Which of the following is/are the purposes of coatings?
A. To acts as a sacrificial metal
B. To act as an effective barrier
C. Either to act as sacrificial metal or to act as an effective barrier
D. Neither to act as sacrificial metal nor to act as an effective barrier
Question 18
Which of the following paints are widely used for corrosion applications?
A. Vinyl and epoxy paints
B. Asphalts and bituminous paints
C. Iron oxide and titanium oxide paints
D. Alkyds and red lead