9-32.
9-33.
9-34.
9-35.
9-36.
9-37.
What is the recommended method for
locating small internal leaks in
hydraulic systems?
1.
Use magnetic flux
2.
Install pressure gages
3.
Listen for identifying sounds
4.
Visually inspect the disassembled
parts
Question 9-33 is to be judged True or
False.
The most frequent symptom of trouble in a
hydraulic system is indicated by unusual
noise.
A popping or sputtering noise in a
hydraulic system indicates which of the
following conditions?
1.
Oil leak in the pressure line
2.
Air leak in the pressure line
3.
Air leak in the suction line
4.
Air pocket in the cylinder
Which of the following conditions should
you suspect if a pounding or rattling
noise occurs in a hydraulic system?
1.
Overtight adjustment of parts
2.
Defective spring-activated valve
3.
Improperly adjusted relief valve
4.
Overloaded system or high-speed
operation
Foreign matter in the oil of a hydraulic
transmission usually causes which of the
following types of noises?
1.
Rattling
2.
Popping
3.
Squealing
4.
Grinding
When a squealing or squeaking noise
occurs in a hydraulic system, it is
usually caused by which of the following
conditions?
1.
Wiped bearings
2.
Air pocket in the cylinder
3.
Overtight packing around moving parts
4.
Overloaded system during high-speed
operation
9-38.
What should an Engineman do if a faulty
operation of a circuit breaker is
discovered?
1.
Repair the circuit breaker
2.
Check for excessive binding in the
electric motor
3.
Replace any damaged equipment in the
lines
4.
Report the condition to the
Electrician's Mate
9-39.
If a hydraulic system is left idle for
long periods of time, which of the
following difficulties may be expected to
develop?
9-40.
9-41.
1.
Misalignment of linkage
2.
Accumulation of sludge
3.
External leakage
4.
Internal leakage
Evidence of which of the following
foreign substances in the oil of a
hydraulic system calls for draining the
oil, cleaning the system, and filling it
with clean oil?
1.
Water
2.
Sludge
3.
Acid
4.
Each of the above
What is the purpose of securing a
hydraulic system for 1 hour after filling
it with flushing oil?
1.
To permit the settling of foreign
matter
2.
To dissolve sludge
3.
To permit the venting of air
4.
To dissolve corrosive deposits
9-42.
Which of the following actions is part of
the procedure for cleaning a hydraulic
system?
1.
Allow the system to remain idle for
15 minutes after operating it with a
light load for 4 minutes
2.
Operate the system for an hour while
it is filled with cleaning fluid
3.
Operate the system at high pressure
while it is filled with cleaning
fluid
4.
Dilute the old hydraulic oil with
cleaning fluid and operate the system
for 15 minutes, then allow the system
to remain idle for about 5 minutes
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