Hydraulic and Pneumatic Power Systems - 114 WRITTEN TEST QUESTIONS AND CORRECT ANSWERS
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Course
Hydraulic and Pneumatic Power Systems
Institution
Hydraulic And Pneumatic Power Systems
To protect packing rings or seals from damage when it is necessary to install them over or inside threaded sections, the.....? - ️️Threaded section should be covered with a suitable sleeve.
Which of the following is adversely affected by atmospheric humidity if left unprotected?
1. MIL-H-56...
Hydraulic and Pneumatic Power
Systems - WRITTEN TEST QUESTION
To protect packing rings or seals from damage when it is necessary to install them over or inside
threaded sections, the.....? - ✔ ✔ Threaded section should be covered with a suitable sleeve.
Which of the following is adverse ly affected by atmospheric humidity if left unprotected?
1. MIL -H-5606 hydraulic fluid.
2. Skydrol hydraulic fluid.
3. None of the above. - ✔ ✔ 2 (phosphate ester -base)
Most variable displacement aircraft hydraulic pumps in use.....? - ✔ ✔ contain a built -in means of
system pressure regulation.
The component in the hydraulic system that is used to direct the flow of fluid is the.....? - ✔ ✔
Selector valve.
Which is a characteristic of petroleum base hydraulic fluid? - ✔ ✔ Flammable under normal
condition s.
Which allows free fluid flow in one direction and no fluid flow in the other direction? - ✔ ✔ Check
valve.
To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal
is the.....? - ✔ ✔ O-ring Seal.
Components containing phosphate ester -base hydraulic fluid may be cleaned with.....? - ✔ ✔
Stoddard Solvent.
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After a hydraulic accumulator has been installed and air chamber charged, the main system hydraulic
pressure gauge will not show a hydraulic press ure reading until.....? - ✔ ✔ The fluid side of the
accumulator has been charged.
If two actuating cylinders which have the same cross -sectional area but different lengths of stroke are
connected to the same source of hydraulic pressure, they will exert.. ...? - ✔ ✔ Equal amounts of
force and will move at the same rate of speed.
How is the air in a hydraulic accumulator prevented from entering the fluid system? - ✔ ✔ By
physically separating the air chamber from the oil chamber with a flexible or movable s eparator.
The purpose of restrictors in hydraulic systems is to.....? - ✔ ✔ Control the rate of movement of
hydraulic operated mechanisms.
Quick -disconnect couplings in hydraulic systems provide a means of.....? - ✔ ✔ Quickly connecting
and disconnection hydraulic lines without loss of fluid or entrance of air into the system.
The main system pressure relief valve in a simple hydraulic system equipped with a power control valve
should be adjusted.....? - ✔ ✔ with the power control valve held in the CLOSE D position.
Relief valves are used in pneumatic systems.....? - ✔ ✔ As damage -preventing units.
A loud hammering noise in a hydraulic system having an accumulator usually indicates.....? - ✔ ✔
Too low or no pre -load in the accumulator.
What type of pack ings should be used in hydraulic components to be installed in a system containing
Skydrol? - ✔ ✔ Packing materials made for ester -base fluids.
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