5-22.
Four cubic feet of a gas at 40°F
has a gauge pressure of 100 psig.
If the volume of the gas is
expanded to 6 cubic feet and the
gas heated to a temperature of
90°F, what will the new gauge
pressure be?
1.
67.9 psig
2.
69.4 psig
3.
71.5 psig
4.
73.6 psig
Learning Objective:
Recognize
characteristics of gases used in
pneumatic systems, safety
precautions for handling
compressed gas, and color codes
of compressed gas cylinders.
5-23.
In addition to being nonpoisonous
and free from any acids that
might cause system corrosion, the
gas used as the fluid medium for
a pneumatic system must possess
which of the following
characteristics?
1.
Nonflammability
2.
Chemical stability
3.
Ready availability
4.
All of the above
5-24.
The gases used in Navy pneumatic
systems are similar to the
liquids used in hydraulic
systems, except that the gases
are not
1.
acid free
2.
nontoxic
3.
good lubricants
4.
chemically stable
5-25.
What characteristic of compressed
air makes it undesirable as a
medium for pneumatic systems?
1.
Its toxicity
2.
Its flammability
3.
Its moisture content
4.
Its lubricating qualities
5-26.
In all compressed air systems,
the compressor, due to the
unlimited supply of air, is
installed in the distribution
lines leading to the device to be
operated.
5-27.
Which of the following statements
is NOT true of LP air systems?
1.
The LP air system is supplied
with LP air by LP air
compressors
2.
The LP air system is supplied
with air by the HP air system
supplying air through a
pressure-reducing station
3.
The LP air system is supplied
with air by the MP air system
supplying air through a
pressure-reducing station
4.
LP compressed air is used in
the production of nitrogen
5-28.
Why is the use of nitrogen
preferred over the use of
compressed air in many aircraft
and missile pneumatic systems?
1.
Nitrogen cannot support
living organisms
2.
Nitrogen cannot support
combustion and fire
3.
Nitrogen does not cause rust
or decay of the surfaces with
which it comes in contact
4.
All of the above
5-29.
Which of the following steps can
a maintenance person take to
control contamination of
pneumatic systems?
1.
Install an air filter in the
supply line
2.
Keep all tools and the work
air clean and dirt free
3.
Cap or plug all lines and
fittings immediately after
disconnecting them
4.
Both 2 and 3 above
5-30.
You must NEVER use the contents
of a cylinder identified by which
of the following color codes for
purging an oxygen system?
1.
Gray
2.
Black
3.
One black stripe around its
top
4.
One green stripe around its
top
1.
True
2.
False
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