PDH Engineer     PE PDH
PDH Online

Technical Painting for New Construction and Maintenance


Quiz Questions

1.Corrosion is defined as the deterioration of a material usually a metal, because of a reaction with its environment and which requires the presence of an anode, a cathode, an electrolyte, and an electrical circuit.
True
False
2. The basic corrosion cell consists of an anode, a cathode, an electrolyte, and a metallic path for electron flow. The corrosion current (z) enters the electrolyte at the anode and flows to the cathode.
True
False
3.Galvanic (dissimilar metals) corrosion occurs when two electrochemically dissimilar metals are metallically connected and exposed to a corrosive environment.
True
False
4.____________________ is a corrosion process in which one element is preferentially removed from an alloy.
Alloying
Dealloying
5. Pitting corrosion is a randomly occurring, highly localized form of attack on a metal surface, characterized by the fact that the depth of penetration is much greater than the diameter of the area affected.
True
False
6. Intergranular corrosion cracking describes the phenomenon that can occur when many alloys are subjected to static, surface tensile stresses and are exposed to certain corrosive environments.
True
False
7.A schematic view showing sacrificial-anode-type cathodic protection installation for an underground steel pipeline is represented in ________________.
Figure 2-1
Figure 2-2
8. The sacrificial anode type cathodic protection systems require no external power and are easy to install.
True
False
9.Natural resins generally are cooked with drying oils to make varnishes with faster drying rates, higher gloss, and harder films than can be attained from the oil alone.
True
False
10.Natural resins called copals are derived from fossilized or semi-fossilized vegetable remains. These resins have high carboxyl-functional hydrocarbons of high acid number and, therefore, are reactive.
True
False
11.Cross linking reactions in urethane coatings consist of a reaction between an isocyanate containing (-N=C=O) material and a material with a polyhydroxylated (-OH) containing co reactant.
True
False
12.The polyether prepolymer is considerably less expensive than either acrylic or polyester polyols.
True
False
13.Portable XRF detectors are used directly on the painted surface to provide a nondestructive analysis of the amount of lead present.
True
False
14.Spot testing using sodium sulfide is a qualitative method for determining the presence of lead.
True
False
15. Lac is a resinous secretion of a coccid insect from India and Thailand used to make _____________.
Rosins
Shellac
16.Steam cleaning effectively removes grease, oil, and dirt by a combination of detergent action, high pressure heated water (138 °C [280 °F] to 149 °C [300 °F] at 0.189 to 0.315 liters/sec [3 to 5 gal/min]), and impact; and it is used on both coated and uncoated surfaces. The equipment consists mainly of a pressure jet steam cleaner.
True
False
17. Chemical stripping involves the application of an alkali, acid, or methylene chloride solution to a painted surface by spray, brush, or trowel. The solution remains on the surface for a few hours or overnight to allow the chemical reaction to take place and soften the coating.
True
False
18.The blast pot (direct pressure machine) is the high production blast machine used in shipyards, refineries, chemical plants, and other facilities for large-scale blast-cleaning operations. The size of the blast pot is generally determined by its abrasive capacity. Therefore, the smaller the pot capacity, the more frequent filling is required.
True
False
19.Portable electrostatic spray units are used for coating applications to odd-shaped metal objects, such as wire fencing, angles, channels, cables, and piping. Electrostatic spray units impart an electrostatic charge to the coating, which causes the material to be attracted to a properly grounded object.
True
False
20.Leachable Levels That Result in Toxicity is represented in _____________________________.
Table 11-2
Table 11-3