Hydraulic and Pneumatic Power Systems
ASA Exam Questions And Answers
Many hydraulic reservoirs contain a small quantity of fluid which is
not available to the main system pump. This fluid is retained to - - -
correct answer ✅supply fluid to the auxiliary pump.
What is commonly used to connect an emergency source of power,
and at the same time disconnect the normal hydraulic source from
critical parts of a landing gear or wheel braking system for
operation (usually when the normal source system fails)? - - -
correct answer ✅Shuttle valve.
How many of these seals are used with petroleum base hydraulic
fluids? - - -
correct answer ✅Neoprene, Buna-N.
Teflon hose that has developed a permanent set from being
exposed to high pressure or temperature should - - -
correct answer ✅not be straightened or bent further.
The purpose of restrictors in hydraulic systems is to - - -
correct answer ✅control the rate of movement of hydraulically
operated mechanisms.
,Hydraulic and Pneumatic Power Systems
ASA Exam Questions And Answers
If an aircraft's constant-pressure hydraulic system cycles more
frequently than usual and no fluid leakage can be detected, the
most probable cause is - - -
correct answer ✅low accumulator air preload.
What is the main purpose of a pressurized reservoir in a hydraulic
system? - - -
correct answer ✅Prevent hydraulic pump cavitation.
After installation of a rebuilt hydraulic hand pump, it is found that
the handle cannot be moved in the pumping direction (pressure
stroke). The most likely cause is an incorrectly installed - - -
correct answer ✅hand pump outport check valve.
In a gear-type hydraulic pump, a mechanical safety device
incorporated to protect the pump from overload is the - - -
correct answer ✅bypass valve.
If a hydraulic brake system uses neoprene rubber packing materials,
the correct hydraulic fluid to service the system is - - -
correct answer ✅mineral base oil.
, Hydraulic and Pneumatic Power Systems
ASA Exam Questions And Answers
Relief valves are used in pneumatic systems - - -
correct answer ✅as damage preventing units
Chattering of the hydraulic pump during operation is an indication -
--
correct answer ✅that air is entering the pump.
What type of valve in an aircraft hydraulic system permits fluid to
flow freely in one direction, but restricts the rate at which fluid is
allowed to flow in the other direction? - - -
correct answer ✅Orifice check valve.
One of the main advantages of skydrol is its - - -
correct answer ✅wide operating temperature.
A hydraulic motor converts fluid pressure to - - -
correct answer ✅rotary motion.
If a rigid tube is too short for the flare to reach its seat before
tightening, pulling it into place by tightening - - -
correct answer ✅may distort the flare.
ASA Exam Questions And Answers
Many hydraulic reservoirs contain a small quantity of fluid which is
not available to the main system pump. This fluid is retained to - - -
correct answer ✅supply fluid to the auxiliary pump.
What is commonly used to connect an emergency source of power,
and at the same time disconnect the normal hydraulic source from
critical parts of a landing gear or wheel braking system for
operation (usually when the normal source system fails)? - - -
correct answer ✅Shuttle valve.
How many of these seals are used with petroleum base hydraulic
fluids? - - -
correct answer ✅Neoprene, Buna-N.
Teflon hose that has developed a permanent set from being
exposed to high pressure or temperature should - - -
correct answer ✅not be straightened or bent further.
The purpose of restrictors in hydraulic systems is to - - -
correct answer ✅control the rate of movement of hydraulically
operated mechanisms.
,Hydraulic and Pneumatic Power Systems
ASA Exam Questions And Answers
If an aircraft's constant-pressure hydraulic system cycles more
frequently than usual and no fluid leakage can be detected, the
most probable cause is - - -
correct answer ✅low accumulator air preload.
What is the main purpose of a pressurized reservoir in a hydraulic
system? - - -
correct answer ✅Prevent hydraulic pump cavitation.
After installation of a rebuilt hydraulic hand pump, it is found that
the handle cannot be moved in the pumping direction (pressure
stroke). The most likely cause is an incorrectly installed - - -
correct answer ✅hand pump outport check valve.
In a gear-type hydraulic pump, a mechanical safety device
incorporated to protect the pump from overload is the - - -
correct answer ✅bypass valve.
If a hydraulic brake system uses neoprene rubber packing materials,
the correct hydraulic fluid to service the system is - - -
correct answer ✅mineral base oil.
, Hydraulic and Pneumatic Power Systems
ASA Exam Questions And Answers
Relief valves are used in pneumatic systems - - -
correct answer ✅as damage preventing units
Chattering of the hydraulic pump during operation is an indication -
--
correct answer ✅that air is entering the pump.
What type of valve in an aircraft hydraulic system permits fluid to
flow freely in one direction, but restricts the rate at which fluid is
allowed to flow in the other direction? - - -
correct answer ✅Orifice check valve.
One of the main advantages of skydrol is its - - -
correct answer ✅wide operating temperature.
A hydraulic motor converts fluid pressure to - - -
correct answer ✅rotary motion.
If a rigid tube is too short for the flare to reach its seat before
tightening, pulling it into place by tightening - - -
correct answer ✅may distort the flare.
