ASA Hydraulic and Pneumatic Power sys Questions with Correct Answers
Question 1:
(8386) - To protect packing rings or seals from damage when it is necessary to install them over
or inside threaded sections, the
Answer:
C- threaded section should be covered with a suitable sleeve.
Question 2:
(8387) - To prevent external and internal leakage in aircraft hydraulic units, the most commonly
used type of seal is the
Answer:
A- O-ring seal.
Question 3:
(8388) - Which allows free fluid flow in one direction and no fluid flow in the other direction?
A- Check valve
(8389) - Select the valve used in a hydraulic system that directs pressurized fluid to one end of
an actuating cylinder and simultaneously directs return fluid to the reservoir from the other
end.
Answer:
C- Selector.
Question 4:
(8390) - What function does the absolute pressure regulator perform in the pneumatic power
system?
Answer:
C- Regulates the compressor inlet air to provide a stabilized source of air for the compressor.
(8391) - (1) Relief valves are used in pneumatic systems as damage-preventing units.(2) Check
valves are used in both hydraulic and pneumatic systems.Regarding the above statements,
A- both No. 1 and No. 2 are true.
Question 5:
(8392) - One of the distinguishing characteristics of an open-center selector valve used in a
hydraulic system is that
,Answer:
A- fluid flows through the valve in the OFF position.
Question 6:
(8393) - What type of packings should be used in hydraulic components to be installed in a
system containing Skydrol?
Answer:
B- Packing materials made for ester base fluids.
Question 7:
(8394) - Relief valves are used in pneumatic systems
Answer:
C- as damage-preventing units.
Question 8:
(8395) - An aircraft pneumatic system, which incorporates an engine-driven multistage
reciprocating compressor, also requires
Answer:
C- a moisture separator.
(8396) - The removal of air from an aircraft hydraulic system is generally accomplished B- by
operating the various hydraulic components through several cycles.
Question 9:
(8397) - Pneumatic systems utilize
Answer:
B- relief valves.
(8398) - The component in the hydraulic system that is used to direct the flow of fluid is the C-
selector valve.
Question 10:
(8399) - What type of selector valve is one of the most commonly used in hydraulic systems to
provide for simultaneous flow of fluid into and out of a connected actuating unit?
Answer:
A-Four-port, closed-center valve.
, Question 11:
(8400) - What is the purpose of using backup rings with O-rings in hydraulic systems above
1,500 PSI?
Answer:
C- Prevent high pressure from extruding the seal between the moving and stationary part.
Question 12:
(8401) - The purpose of the pressure regulator in a hydraulic system is to
Answer:
A- maintain system operating pressure within a predetermined range and to unload the pump.
Question 13:
(8402) - A flexible sealing element subject to motion is a
Answer:
B- packing.
Question 14:
(8403) - Which characteristics apply to aircraft hydraulic systems?1. Minimum maintenance
requirements.2. Lightweight.3. About 80 percent operating efficiency (20 percent loss due to
fluid friction).4. Simple to inspect.
Answer:
C- 1, 2, 4.
Question 15:
(8404) - If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into
place by tightening
Answer:
B- may distort the flare.
Question 16:
(8405) - The installation of a new metal hydraulic line should be made with
Answer:
C- enough bends to allow the tube to expand and contract with temperature changes and to
absorb vibration.
Question 1:
(8386) - To protect packing rings or seals from damage when it is necessary to install them over
or inside threaded sections, the
Answer:
C- threaded section should be covered with a suitable sleeve.
Question 2:
(8387) - To prevent external and internal leakage in aircraft hydraulic units, the most commonly
used type of seal is the
Answer:
A- O-ring seal.
Question 3:
(8388) - Which allows free fluid flow in one direction and no fluid flow in the other direction?
A- Check valve
(8389) - Select the valve used in a hydraulic system that directs pressurized fluid to one end of
an actuating cylinder and simultaneously directs return fluid to the reservoir from the other
end.
Answer:
C- Selector.
Question 4:
(8390) - What function does the absolute pressure regulator perform in the pneumatic power
system?
Answer:
C- Regulates the compressor inlet air to provide a stabilized source of air for the compressor.
(8391) - (1) Relief valves are used in pneumatic systems as damage-preventing units.(2) Check
valves are used in both hydraulic and pneumatic systems.Regarding the above statements,
A- both No. 1 and No. 2 are true.
Question 5:
(8392) - One of the distinguishing characteristics of an open-center selector valve used in a
hydraulic system is that
,Answer:
A- fluid flows through the valve in the OFF position.
Question 6:
(8393) - What type of packings should be used in hydraulic components to be installed in a
system containing Skydrol?
Answer:
B- Packing materials made for ester base fluids.
Question 7:
(8394) - Relief valves are used in pneumatic systems
Answer:
C- as damage-preventing units.
Question 8:
(8395) - An aircraft pneumatic system, which incorporates an engine-driven multistage
reciprocating compressor, also requires
Answer:
C- a moisture separator.
(8396) - The removal of air from an aircraft hydraulic system is generally accomplished B- by
operating the various hydraulic components through several cycles.
Question 9:
(8397) - Pneumatic systems utilize
Answer:
B- relief valves.
(8398) - The component in the hydraulic system that is used to direct the flow of fluid is the C-
selector valve.
Question 10:
(8399) - What type of selector valve is one of the most commonly used in hydraulic systems to
provide for simultaneous flow of fluid into and out of a connected actuating unit?
Answer:
A-Four-port, closed-center valve.
, Question 11:
(8400) - What is the purpose of using backup rings with O-rings in hydraulic systems above
1,500 PSI?
Answer:
C- Prevent high pressure from extruding the seal between the moving and stationary part.
Question 12:
(8401) - The purpose of the pressure regulator in a hydraulic system is to
Answer:
A- maintain system operating pressure within a predetermined range and to unload the pump.
Question 13:
(8402) - A flexible sealing element subject to motion is a
Answer:
B- packing.
Question 14:
(8403) - Which characteristics apply to aircraft hydraulic systems?1. Minimum maintenance
requirements.2. Lightweight.3. About 80 percent operating efficiency (20 percent loss due to
fluid friction).4. Simple to inspect.
Answer:
C- 1, 2, 4.
Question 15:
(8404) - If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into
place by tightening
Answer:
B- may distort the flare.
Question 16:
(8405) - The installation of a new metal hydraulic line should be made with
Answer:
C- enough bends to allow the tube to expand and contract with temperature changes and to
absorb vibration.
