LESSON 2
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer and Feedback
1.
B.
Two. The two types of identification code systems are
the solid color band system and the tape system. (Page 27)
2.
A.
Low
pressure.
The
beaded
connection
is
not
constructed to be reliable in high-pressure systems.
It
should be used only in a system that is designated
low
pressure. (Page 41)
3.
C.
Three.
There are three methods of cleaning tubing
according to TM 1-1500-204-23-Series: vapor degreasing
method, naptha method, and hot inhibited alkaline cleaner
method. Always check the technical manual for proper usage.
(Page 41)
4.
D.
25.
Any dent that exceeds 20 percent of the tube
diameter will cause a construction in the tube resulting in a
reduction in the fluid traveling through the line. (Page 47)
5.
D.
25.
The criteria for tubing carrying less than 100
psi is not as critical. These tubes are usually only return
or drain lines. (Page 25)
6.
B.
Copper tubing.
Copper tubing is used in oxygen
systems because it is a nonferrous metal and will not cause
any sparks when a wrench is applied to any fittings. (Page
30)
7.
A.
0 psi.
You should never tighten a fitting under
pressure because the pressure causes resistance which results
in an undertorqued condition. (pg 45)
8.
D.
Seven.
The types of seals or packing are o-rings,
backup rings, V-rings, U-rings, cup seals, oil seals, and
wiper seals. Each serves a special purpose. (pg 65-66)
9.
D.
Never.
Seals or gaskets must never be reused after
being removed due to the possibility of their being damaged
during removal. Once damaged, they cannot serve the original
purpose. (pg 64)
10.
A.
None.
When you cut replacement gaskets from bulk
material, the most important consideration is the exact
duplication of the thickness of the original gasket due to
the close-tolerance machining of the parts. (pg 67)
71
AL0907
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