5-41.
Upon completion of visual
inspection of a flexible hose
assembly, a hydrostatic test is
done to ensure what allowable
maximum pressure?
1.
Rated pressure for 1 hour
2.
Twice the rated pressure for 1
hour
3.
Rated pressure for not less
than 1 minute
4.
Twice the rated pressure for
not less than 1 minute
5-42.
Hose assemblies intended for gas
or air service must be tested with
1.
compressed air at 1 psi
2.
hydrogen at 10 psi
3.
nitrogen at 100 psi
4.
oxygen at 1,000 psi
5-43.
Fittings are used to connect pipe,
tube, or hose to system
components.
One type of fitting
is the bolted flange joint, which
is used in systems operating at
which of the following pressures?
1.
100 psi
2.
1,000 psi
3.
10,000 psi
4.
All pressures now in use
5-44.
The use of flange safety shields
reduces the possibility of which
of the following problems?
1.
Fuel oil leaks
2.
MER flooding
3.
AMR fuel fires
4.
Lube oil pooling
5-45.
Many shipboard machinery
casualties have resulted from
fasteners that were not properly
installed.
Which of the following
reasons can cause fasteners to
loosen?
1.
Machinery vibration
2.
Thermal expansion
3.
Thermal contraction
4.
Each of the above
5-46.
When installed and tightened, male
threaded fasteners protrude at
least one thread length beyond the
top of the nut or plastic locking
ring.
The number of threads
should not exceed five and in no
case should thread protrusion
exceed ten threads.
This is the 1
to 10 rule.
1.
True
2.
False
5-47.
Which of the following phrases
best describe the refrigeration
effect?
A.
Heat will flow from a colder
to a warmer object or
environment
B.
Heat will flow from a warmer
to a colder object or
environment
c.
An artificial way of lowering
the temperature
D.
A mechanical transformation of
the surrounding atmosphere
1.
A and D
2.
B and C
3.
A and D
4.
C and D
5-48.
What is the unit of measurement
for the amount of heat removed in
a refrigeration system?
1.
Btu
2. SAE
3.
Latent heat
4.
Refrigeration ton
5-49.
Which of the following is/are the
main part(s) of the R-12 system?
1. TXV
2.
Capacity control system
3.
Receiver
4.
All of the above
5-50.
What device maintains a constant
refrigerant condensing pressure?
1.
Evaporator
2.
Capacity control system
3.
Water regulating valve
4.
Compressor
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