Airframe - Hydraulic and Pneumatic Power
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
Hydraulic fluid reservoirs are sometimes designed with a standpipe
in one of the outlet ports in order to assure emergency supply of
fluid. The outlet port with the standpipe in it furnishes fluid to the -
--
correct answer ✅normal system power pump.
An emergency supply of fluid is often retained in the main hydraulic
system reservoir by the use of a standpipe. The supply line is
connected to the - - -
correct answer ✅inlet of the main hydraulic system.
To check the air charge in a hydraulic accumulator, - - -
correct answer ✅reduce all hydraulic pressure, then observe the
reading on the accumulator air gauge.
How would the air pressure charge in the accumulator be
determined if the engine is inoperative, but the system still has
hydraulic pressure? - - -
correct answer ✅Operate a hydraulic unit slowly and note the
pressure at which a rapid pressure drop begins as it goes toward
zero.
,Airframe - Hydraulic and Pneumatic Power
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
How many of these seals are used with petroleum-base hydraulic
fluids? - - -
correct answer ✅Neoprene, Buna-N.
Hydraulic system thermal relief valves are set to open at a - - -
correct answer ✅higher pressure than the system relief valve.
Chatter in a hydraulic system is caused by - - -
correct answer ✅air in the system.
If hydraulic fluid is released when the air valve core of the
accumulator is depressed, it is evidence of - - -
correct answer ✅a ruptured diaphragm or leaking seals.
Although dents in the heel of a bend are not permissible, they are
acceptable in the remainder of a hydraulic tube providing they are
less than what percent of the tube diameter? - - -
correct answer ✅20 percent.
,Airframe - Hydraulic and Pneumatic Power
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
If the hydraulic system pressure is normal while the engine-driven
pump is running, but there is no pressure after the engine has been
shut off, it indicates - - -
correct answer ✅no air pressure in the accumulator.
The purpose of restrictors in hydraulic systems is to - - -
correct answer ✅control the rate of movement of hydraulically
operated mechanisms.
A common cause of slow actuation of hydraulic components is - - -
correct answer ✅internal leakage in the actuating unit.
A loud hammering noise in a hydraulic system that has an
accumulator usually indicates - - -
correct answer ✅too low or no preload in the accumulator.
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.
, Airframe - Hydraulic and Pneumatic Power
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
In a typical high-pressure pneumatic system, if the moisture
separator does not vent accumulated water when the compressor
shuts down, a likely cause is a - - -
correct answer ✅malfunctioning solenoid dump valve.
Before removing the filler cap of a pressurized hydraulic reservoir,
in order to service the system, you must - - -
correct answer ✅relieve the air pressure.
What happens to the output of a constant-displacement hydraulic
pump when the hydraulic system pressure regulator diverts the
fluid from the system to the reservoir? - - -
correct answer ✅The output pressure reduces, but the volume
remains the same.
Hydraulic system accumulators serve which of the following
functions? - - -
correct answer ✅Supplement the system pump when demand is
beyond the pump's capacity and store power for limited operation
of components if the pump is not operating.
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
Hydraulic fluid reservoirs are sometimes designed with a standpipe
in one of the outlet ports in order to assure emergency supply of
fluid. The outlet port with the standpipe in it furnishes fluid to the -
--
correct answer ✅normal system power pump.
An emergency supply of fluid is often retained in the main hydraulic
system reservoir by the use of a standpipe. The supply line is
connected to the - - -
correct answer ✅inlet of the main hydraulic system.
To check the air charge in a hydraulic accumulator, - - -
correct answer ✅reduce all hydraulic pressure, then observe the
reading on the accumulator air gauge.
How would the air pressure charge in the accumulator be
determined if the engine is inoperative, but the system still has
hydraulic pressure? - - -
correct answer ✅Operate a hydraulic unit slowly and note the
pressure at which a rapid pressure drop begins as it goes toward
zero.
,Airframe - Hydraulic and Pneumatic Power
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
How many of these seals are used with petroleum-base hydraulic
fluids? - - -
correct answer ✅Neoprene, Buna-N.
Hydraulic system thermal relief valves are set to open at a - - -
correct answer ✅higher pressure than the system relief valve.
Chatter in a hydraulic system is caused by - - -
correct answer ✅air in the system.
If hydraulic fluid is released when the air valve core of the
accumulator is depressed, it is evidence of - - -
correct answer ✅a ruptured diaphragm or leaking seals.
Although dents in the heel of a bend are not permissible, they are
acceptable in the remainder of a hydraulic tube providing they are
less than what percent of the tube diameter? - - -
correct answer ✅20 percent.
,Airframe - Hydraulic and Pneumatic Power
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
If the hydraulic system pressure is normal while the engine-driven
pump is running, but there is no pressure after the engine has been
shut off, it indicates - - -
correct answer ✅no air pressure in the accumulator.
The purpose of restrictors in hydraulic systems is to - - -
correct answer ✅control the rate of movement of hydraulically
operated mechanisms.
A common cause of slow actuation of hydraulic components is - - -
correct answer ✅internal leakage in the actuating unit.
A loud hammering noise in a hydraulic system that has an
accumulator usually indicates - - -
correct answer ✅too low or no preload in the accumulator.
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.
, Airframe - Hydraulic and Pneumatic Power
Systems Part 6, AIRCRAFT CABIN
ATMOSPHERE SYSTEM -BLOCK VIII ,
Prepware Exam Questions And Answers’
In a typical high-pressure pneumatic system, if the moisture
separator does not vent accumulated water when the compressor
shuts down, a likely cause is a - - -
correct answer ✅malfunctioning solenoid dump valve.
Before removing the filler cap of a pressurized hydraulic reservoir,
in order to service the system, you must - - -
correct answer ✅relieve the air pressure.
What happens to the output of a constant-displacement hydraulic
pump when the hydraulic system pressure regulator diverts the
fluid from the system to the reservoir? - - -
correct answer ✅The output pressure reduces, but the volume
remains the same.
Hydraulic system accumulators serve which of the following
functions? - - -
correct answer ✅Supplement the system pump when demand is
beyond the pump's capacity and store power for limited operation
of components if the pump is not operating.
