Question 1

Technician A says the size and shape of the part being sprayed often dictates the size of the spray pattern. Technician B says air pressure has little effect on the size and shape of the spray pattern and the resulting surface appearance. Who is correct?

Accepted Answer

Technician A is correct, as the size and shape of the part being sprayed will determine the size of the spray pattern. Technician B is incorrect, as air pressure does have an effect on the size and shape of the spray pattern and resulting surface appearance.

Question 2

HVLP guns reduce overspray, ____________________ emissions and reduce material use.

Accepted Answer

VOC

Question 3

HVLP spray guns not only cut material costs, but that they are also required in some areas.

Accepted Answer

HVLP (High Volume Low Pressure) spray guns are known for their efficient use of material, which can result in cost savings. Additionally, in some areas, regulations require the use of HVLP spray guns due to their reduced overspray and air pollution.

Question 4

Technician A says that a spray gun must be adjusted each time it is used even though the material being sprayed is the same each time. Technician B says that an air cap pressure gauge reading will be the same as the pressure on the wall regulator. Who is correct?

Accepted Answer

Technician A is correct. Even if the material being sprayed is the same, the application may require different spray patterns or viscosity, which will require the spray gun to be adjusted each time it is used.

Technician B is incorrect. Air cap pressure gauge reading may different from the pressure on the wall regulator due to pressure drop in the hose or other factors. Therefore, the pressure gauge should be used to adjust the pressure at the gun.

Question 5

Technician A says that a charcoal vapor respirator is required only when spraying urethane finishes. Technician B says paint manufacturer will specify which respiratory protective equipment should be used when spraying their product. Who is correct?

Accepted Answer

The answer of Technician A says that a charcoal vapor...

Question 6

Technician A says the air flowing out of the air cap on the spray gun determines the size and shape of the spray pattern. Technician B says atomization breaks down the surface tension of a liquid and converts it into numerous tiny droplets making it sprayable. Who is correct?

Accepted Answer

Both technicians are correct. The air flowing out of the air cap on the spray gun determines the size and shape of the spray pattern, while atomization breaks down the surface tension of a liquid and converts it into numerous tiny droplets making it sprayable.

Question 7

A spray gun should not be lubricated because it will contaminate the finish when spraying.

Accepted Answer

Lubricating a spray gun is necessary for its maintenance and proper functioning, but it should be done carefully to avoid contaminating the finish. Proper lubrication points are typically external and do not come into contact with the paint or finishing material.

Question 8

Technician A says that when cleaning a spray gun manually requires the painter to use leather gloves for PPE. Technician B says respiratoy protective equimpment should be worn when manually cleaning the spray gun. Who is correct?

Accepted Answer

Technician B is correct because respiratory protective equipment is necessary to protect against inhaling harmful vapors during the cleaning process. Leather gloves are not specified for this task; chemical-resistant gloves are more appropriate.

Question 9

Technician A says some spray guns may have a pressue gauge built into the handle. Technician B says some spray guns produce an ellipitical spray pattern while others produce a fan shaped or tapered pattern. Who is correct?

Accepted Answer

Both technicians are correct. Some spray guns may have a pressure gauge built into the handle for easy monitoring of paint pressure, and different spray guns can produce different spray patterns such as elliptical, fan-shaped, or tapered patterns.

Question 10

Technician A says CFM is a term commonly used to describe the volume of air required for spraying operations. Technician B says that only HVLP spray guns offer a transfer efficiency 35% when used properly. Who is correct?

Accepted Answer

Technician A is correct. CFM stands for cubic feet per minute and it is a term commonly used to describe the volume of air required for spraying operations.

Technician B is incorrect. While HVLP spray guns are known for their high transfer efficiency, they can achieve a transfer efficiency higher than 35% when used properly. There are also other types of spraying equipment that can achieve high transfer efficiencies.

Question 11

Technician A says the fluid needle and the fluid nozzle usually come as a set and are matched to each other. Technician B says that the fluid control knob controls the amount or distance the trigger can be moved thus controlling the fluid flow. Who is correct?

Accepted Answer

Both technicians are correct. The fluid needle and nozzle are usually matched as a set for optimal performance, and the fluid control knob does control the amount and distance the trigger can be moved, regulating the fluid flow.

Question 12

HVLP stands for ____________________ Volume Low Pressure.

Accepted Answer

The answer of HVLP stands for ____________________ Volume Low Pressure....

Question 13

A shop uses 3.5 quarts of solvent per month in a spray gun cleaner to clean the refinish department's spray guns. In a year, the shop will use a total of ____________________ gallons of solvent.

Accepted Answer

The answer of A shop uses 3.5 quarts of solvent...

Question 14

Technician A says that a gravity feed spray gun requires a large of pressure to lift the paint from the cup and move it into the fluid stream inside the paint gun. Technician B says that gravity largely replaces air pressure to move the paint from the cup and into the gun fluid passage. Who is correct?

Accepted Answer

Technician B is correct. In a gravity feed spray gun, gravity is the primary force that moves the paint from the cup into the fluid stream, and air pressure is only needed to regulate the flow and atomization of the paint. The paint flows naturally from the higher position of the cup to the lower position of the gun's fluid passage, without the need for a large amount of pressure to lift it.

Question 15

Atomization starts inside the gun at the needle and nozzle.

Accepted Answer

Atomization primarily occurs at the nozzle's exit, where the paint is forced through a small orifice and broken into fine droplets by the interaction with air or fluid pressure, not inside the gun at the needle and nozzle.

Question 16

Technician A says that a rotating bell paint system offers a very high level of transfer efficinecy using centrifugal force instead of air flow to apply the paint to the surface. Technician B says that electrostatic painting uses positive and negative charges on the paint and object being painted to attract paint to the part. Who is correct?

Accepted Answer

Both technicians A and B are correct. A rotating bell paint system uses centrifugal force to apply the paint to the surface, resulting in a high level of transfer efficiency. Electrostatic painting uses positive and negative charges on the paint and object being painted to attract paint to the part, which also results in a highly effective paint application process.

Question 17

While hand cleaning paint guns, the solvent you are using evaporates at the rate of 1/4 ounce per minute, and it takes you one-half hour to clean the gun. You started with 32 ounces of solvent. ____________________ ounces of solvent will be left when three guns have been cleaned.

Accepted Answer

The answer of While hand cleaning paint guns, the solvent...

Question 18

If the air cap horns are set at the horizontal position, the spray pattern will be vertical.

Accepted Answer

When the air cap horns are set horizontally, the spray pattern will be vertical. This is because the air pressure is directed straight up and down through the air cap horns, pushing the paint droplets out in a vertical pattern.

Question 19

Volatile _______ Compounds are gasses released during paint application

Accepted Answer

The answer of Volatile _______ Compounds are gasses released during...

Question 20

Looking at the pattern when the product is sprayed into the air will tell the technician if the gun is adjusted properly.

Accepted Answer

The answer of Looking at the pattern when the product...

Quiz 20: Paint Spray Guns