RPF QUESTION PAPER ON PAINT

 RPF QUESTION PAPER ON PAINT
1.       Powder coatings do not include solvents but just _____ and _____.   [ solvent , pigment ]
2.       The primary reason why substrates are painted . [ for protection and for decoration ]
3.       What is curing mechanism with reference to paint . [ the way the wet paint or powder particle becomes a solid continuous film, this can be done through polymerization or evaporation ]
4.       Paint films formed by evaporation are called ---- [ non convertible films]
5.       The mechanism to form covalent bonds in the resin, resulting in a film that is cross linked and therefore not easily put back into ------- [solution. ]
6.       A method when a free radical is used to initiate and propagate polymerization in paint ----------   [ coagulation]
7.       ----- refer to components in which resin, pigments and any other components are made fluid using a solvent other than water [ solvent borne]
8.       ------ Is when a hard film is polymerized upon the application of heat [ thermo set film]
9.       ----- is film where the hard film can be softened by the addition of heat. [ thermo plastic film]
10.   -------- coatings same or all of the solvent is water. [ water borne]
11.   Emulsion coatings are also known as --------- coatings  [ latex coatings ]
12.   In emulsion coatings resin is in the form of particles that are dispersed in an -------- liquid [ immissible ]
13.   Powder coating consists of -------[ epoxy polyester or acrylic resin system]
14.   How is powder coating paint cured [ it can be cured by heat, by exposure to UV radiation or  by exposing the powder coated item to a reactive vapour]
15.   Acrylic resins are made from [ monomer Of acrylic and methane acrylic acid esters ]
16.   To add qualities of flexibility durability and chemical resistance to acrylic resins ------- are added [ various functional groups]
17.   How are amino resins formed [ they are formed by the polymerization of urea or melanine with formaldehyde]
18.   How are alkyl resins formed [ formed by the condensation polymerization of polyol and a di basic acid]
19.   How are epoxy resins formed [ they are made from epichlorohydrogen and bi phenol]
20.   Epoxy coatings contain a three membered oxygen center ring called as ---[ oxirans ]
21.   How are polyester formed [ by combining a polyol with a poly basic acid]
22.   How the film properties of poly ester decided [it depends upon type of dibasic acid used : aliphatic – softer film;; aromatic – harder film; or extent Of the polymerisation with styrene]
23.   How are urethane resins formed [ they are based on iso cyanate and polyols]
24.   How are vinyl resins formed [ vinyl chloride polymerized with vinyl acetate]
25.   Solvents do not provide coating with any protective qualities per se . YES / NO [ YES ]
26.   Solvents only permit ----- to the surface on substrates it is designed to protect . [ ease of application ]
27.   With the exception of powder coating solvents are present in all other coatings . true/ false [ true]
28.   Purpose of solvent in paint [ to solubulise the resin and to adjust the viscosity of the paint ]
29.   Th purpose of solvent in emulsion and the latex paints [ act as a carrier for resin particles and is used as a diluents  for ease of application ]
30.   Solvent is also referred to as [ thinner or reducer will affect the appearance of the final film]
31.   The ability of the paint to remain on a vertical surface without dripping or tearing is accomplished by ----[ using a faster evaporative solvent]
32.   The ability of the paint to remain on a horizontal surface long enough to form a glossy film and not to dry quickly to form a orange peeled appearance is achieved by ---[ use of slower evaporating solvent ]
33.   Common solvent used in paint are classified into [ Hydro Carbons , TERPENES, OXYGENATED SOLVENTS ]
34.   Which solvent are considered toxic [ most chlorinated and benzene]
35.   Solvents that are obtained from pine trees and consists of mixture of unsaturated cyclic compounds [ terpenes  10 carbons 16 hydrogen atoms ]
36.   ------ solvents have strong odours [ terpenes]
37.   The solvents coming from petroleum industry [ Contains hydro carbons]
38.   ----- solvents contain C H and also O [ oxygenated ]
39.   Substances that are added to enhance the performance of the paint [ additives and additive package ]
40.   ----- products can be added to the liquid paint  to act as anti foaming  and defoaming agents [silicone ]
41.   ------ is used to prevent the paint from sagging [ clay]
42.   A ---- is formed on surface of paint while it is in a open container and exposed to atmosphere oxygen [ skin ]
43.   Adding ----- to the alkyl paints can prevent skin formation [ oximes]
44.   ----- is added to prevent UV degradation [ hardened Amine light stabilizer]
45.   The job of HALs [ to scavenge free radicals ]
46.   Paint contains materials that are ----- to microbial attacks [ suppressive ]
47.   Paint can be applied using ------ [ mitten ]
48.   ----- propels the paint in  stream of air [ air spray gun]
49.   ----- produce a pressure that propels the paint [ airless]
50.   ---- method can be used in which paint to be coated electrically grounded and paint given a negative charge [ electro static spray ]
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