LESSON 3
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer
1.
D.
A steam cleaner consists of a metal cabinet that houses such components as an
electric motor or gasoline engine and units for individual water, soap, and heating
systems. The detergent and spray, together with impact (friction) caused by high
velocity, loosen and remove dirt and encrustations. (page 3-18, para 3-2h)
2.
B.
It is a good practice to have two or three sets of each size on hand, as many signs
contain two or three of the same letters and it will save time if the complete sigh
is made at one time. (page 3-43, para 3-24d)
3.
A.
Chisels are sharpened by grinding their heads on a grinding wheel to restore the
bevel, which is usually at a 60- to 70-degree angle. Occasionally, you may need
to remove the burrs from the heads if the heads have mushroomed. (page 3-5,
para 3-le)
4.
A.
You should use reinforced abrasive wheels and never exceed the operating speed
indicated on the wheel blotter. (page 3-15, para 3-2d)
5.
C.
Aluminum oxide is backed with production paper, and is used on wood and light-
weight metal surfaces because aluminum oxide's tough coating cuts faster and
longer than flints. (page 3-6, para 3-1g)
6.
B.
It is possible for sparking to occur between a gun and the object being sprayed,
this is due to a static-electrical potential that is generated by the high pressure
necessary for airless spraying. Sparking can result in explosion and/or fire. To
prevent sparking, ensure that both the object being sprayed and the airless
equipment are grounded. Do this by attaching a static wire to ground. If the hose
does not contain a static-electrical conductor, a static wire must be attached from
spray gun to a ground rod. (page 3-36, para 3-12c[1])
7.
D.
The handles of industrial rollers are designed to accommodate a push-broom or
dust-mop handle so floors can be painted without kneeling and ceilings and high
places can be reached without the use of scaffolds. (page 3-29, para 3-6c)
8.
C.
This spray gun will spray heavy paints or materials when supplied with a low air
volume. It is considered one of the best general-purpose guns for use with regular
paints. Since no siphoning effect is necessary for pressure application, it is the
tool for volume painting. (page 3-30, para 3-70
EN0562
3-52
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