WorksheetsAircraft Air Conditioning Quiz
Total questions: 35
Worksheet time: 18mins
When an aircraft is at the ground, Auxiliary power unit (APU) is started to supply the aircraft with
electrical and hydraulic power.
electrical and pneumatic power.
hydraulic and pneumatic power.
To reduce direct bleed air removed from the engine for pressurization, pressurized small aircraft cabin usually used
turbo compressor system.
turbine compressor system.
pressurize compressor system.
The type of air conditioning system used mainly in larger passenger aircraft is
gas cycle machine.
vapour cycle machine.
air cycle machine.
In general gas law, if temperature is constant, pressure will be
openly proportional to its volume.
directly proportional to its volume.
inversely proportional to its volume.
The advantage of using air cycle system over the vapour cycle system in aircraft is
Both air conditioning and pressurization are obtained.
Weight reduction by avoiding big tanks carrying Freon gas.
Less hazardous than vapor cycle system.
A no flow of air in air conditioning system indicates
defective pack valve.
defective dump valve.
defective heat exchanger.
On smaller aircraft with an engine driven compressor or turbocharger, air enters the cabin through a
outflow valve.
control flow valves.
firewall shut-off valve.
A humidifier is installed in the air conditioning system to control the air humidity. Portable water is picked up by a
venturi system via an ON/OFF control valve.
distribution system via an ON/OFF control valve.
conditioning system via an ON/OFF control valve.
Fog coming from the cabin vents and a defect report was raise by the Flight or Cabin Crew. It may indicates that the
humidifier needs to be replaced.
pack valve needs to be replaced.
coalescer bag need to be replaced.
In aircraft pressurization control, when the cabin pressure is held constant regardless of the changing outside pressure, the Pilot will set to
manual Control Mode.
isobaric Control Mode.
differential Control Mode.
When aircraft had landed, a dump valve is used to release all cabin pressurization, This valve is commonly controlled by a
Flap deployment switch.
Engine shut down switch.
landing gear squat switch.
In cabin altitude warning system, the audible and visual warning will be activated around
10000 ft. cabin altitude.
14000 ft. cabin altitude.
20000 ft. cabin altitude.
Engine starting and ground air conditioning uses the
auxiliary power unit (APU)
ram air turbine (RAT)
ground power unit (GPU)
During take-off, climb and cruise conditions, air condition system requires
low air pressure
high air pressure
air from the APU
An aircraft cabin requires air conditioned in order to.
maintain a comfortable air temperature within the aircraft fuselage.
maintain pressure within the fuselage less than the ambient pressure
maintain air density within the cabin at a lower figure than outside the cabin
The function of the mass airflow control valve is to.
ensure that constant airflow out of the cabin is dictated by cabin altitude.
maintain a reasonable mass flow of air into the cabin irrespective of aircraft altitude.
ensure system operating pressure is not exceeded.
Filters are generally incorporated into the ducting to
clean the air
minimize the airflow
control airflow
Pressurization control ensures that
the cabin is always maintained at sea level
at operational altitude the cabin altitude is below 10000 ft
pressurization does not start before aircraft is above 8000 ft
Rate of change of cabin pressure is most noticeably shown on
cabin V.S.I.
cabin pressure gauge
cabin altimeter
If the cabin altitude increases above the normal maximum
compressor delivery is automatically boosted
an inward relief valve opens
a warning light comes on in the cockpit
If the pilot selected a cabin height of 8000 ft. whilst taxiing and activated the pressurization system, the cabin pressure would
decrease to a pressure equivalent to 8000 ft.
decrease to a pressure equivalent to about 500 ft.
remain at ground level pressure.
Cabin pressure controller maintains a pre-set cabin altitude by
regulating the mass flow into the cabin.
regulating the position of the inward relief valve.
regulating the position of the outflow valve.
Should the outflow valve malfunction, the cabin pressure
will not be allowed to exceed the safe limit by use of the safety valve.
will not be allowed to exceed the safe limit by use of the packed valve.
will not be allowed to exceed the safe limit by use of the shut off valve.
During normal flight, air supply in large turbine aircraft is provided by
APU.
engine.
ram air.
The expansion of air over the turbine in the air conditioning system supplies
hot air to the cabin.
cool air to the cabin.
humid air to the cabin
Air is compressed in the compressor and expanded in the turbine. This compression and expansion are carried out in order to add and remove
moisture from the air.
energy from the air.
carbon dioxide from the air.
To cool the hot bleed air from the engines to the Air Cycle Machine, the air must run through the
turbine first.
compressor first.
primary heat exchanger first.
To remove excessive moisture from the air, air cycle machine uses
humidifier.
water separator.
moisture divider.
In large aircraft air conditioning system, the distribution of air that enters the passenger cabin comes from
overhead distribution outlets that run the length of the cabin.
under seat distribution outlets that run the length of the cabin.
firewall distribution outlets that run the length of the cabin.
The purpose of the coalescer bag in air conditioning system is to
collect water and drain it to the bottom of water separator.
filter any contamination in the air flow and is replaced during hangar check.
supply the cabin with fresh air smell and can be replaced accordingly.
In vapour cycle system, leak testing is done by
soap water.
electronic leak detector.
mass spectrometer leak testing.
During flight, flight crew will select 'DUMP' if there is an emergency in the cabin such as fire, smoke etc. This switch will activate the dump valve solenoid and also cause the
pack valve to open.
check valve to open.
safety valve to open.
When a pilot wants to decrease the cabin altitude, the manual control lever is moved down. This will make the outflow valves
open.
close.
stationary.
The doors in passenger service units will unlatch, and the oxygen mask will drop to the passengers when the aircraft reaches approximately
9,800 ft. cabin altitude.
10,000 ft. cabin altitude.
14,000 ft. cabin altitude.
When the air conditioning system detects the supply air temperature is at 121°C, it will
immediately open the safety valve.
close the fast-acting pack shut-off valve.
drive the mixer valve to its full cold position.
