M11.4 A Air Supply Flashcards
(24 cards)
Where does an aircraft receive pressurized air for its pneumatic system?
A) Engines, APU, and Ground source (Air Cart)
B) Fuel tanks and hydraulic pumps
C) Wing spars and landing gear
A) Engines, APU, and Ground source (Air Cart)
What do outflow valves control in a pressurised aircraft?
A) The amount of air that leaves the cabin
B) The amount of fuel used during flight
C) The speed of the aircraft
A) The amount of air that leaves the cabin
What happens when air is compressed in an aircraft pressurisation system?
A) Its temperature increases
B) Its pressure decreases
C) It turns into liquid
A) Its temperature increases
Where is pressurised air for the aircraft usually taken from in turbine engines?
A) The engine compressor stage
B) The engine exhaust
C) The propeller blades
A) The engine compressor stage
How is the changeover between low and high-pressure bleed ports controlled?
A) Automatically
B) Manually by the flight crew
C) By adjusting the engine’s fuel supply
A) Automatically
What could cause bleed air to become contaminated?
A) Leakage allowing oils or fuel to enter
B) Dust from outside the aircraft
C) Overheating of the bleed port
A) Leakage allowing oils or fuel to enter
What is air from the 5th stage of the engine compressor called?
A) Low-pressure air
B) High-pressure air
C) Medium-pressure air
A) Low-pressure air
What is the source of high-pressure air in an engine compressor?
A) The 9th stage bleed port
B) The 5th stage bleed port
C) The engine fan blades
A) The 9th stage bleed port
When is low-pressure air typically used?
A) During take-off, climb, and cruise
B) During descent and taxiing
C) Only when the engines are off
A) During take-off, climb, and cruise
When is high-pressure bleed air used?
A) At low engine RPM speeds during descent
B) During take-off and cruise
C) Only when the aircraft is grounded
A) At low engine RPM speeds during descent
How many groups are compressors divided into?
A) 2
B) 3
C) 4
B) 3
The compressors are divided into three groups:
Positive displacement compressors (Roots-type blower)
Centrifugal compressors
Turbo Compressors
Which of the following is an example of a positive displacement compressor?
A) Roots-type blower
B) Axial compressor
C) Heat exchanger
A) Roots-type blower
What are the three types of compressors?
A) Positive displacement, Centrifugal, Turbo
B) Hydraulic, Centrifugal, Heat exchanger
C) Axial, Roots-type, Hydraulic
A) Positive displacement, Centrifugal, Turbo
How does a Roots-type blower work?
A) It compresses a predetermined volume of air and delivers it to the cabin duct
B) It generates electricity for the aircraft
C) It creates vacuum to remove air from the cabin
A) It compresses a predetermined volume of air and delivers it to the cabin duct
Where is the engine-driven cabin supercharger typically mounted?
A) In the engine nacelle
B) On the wings
C) In the tail section
A) In the engine nacelle
What is the main function of the engine-driven cabin supercharger?
A) To compress outside air and deliver it to the distribution system
B) To cool the engine
C) To reduce fuel consumption
A) To compress outside air and deliver it to the distribution system
When does the drive ratio of the centrifugal cabin compressor reach its peak?
A) At high altitudes with low engine RPM
B) During takeoff
C) At low altitudes with high engine RPM
A) At high altitudes with low engine RPM
What does the APU primarily supply air for?
A) Engine starting and ground air conditioning
B) Fuel injection
C) Pilot oxygen masks
A) Engine starting and ground air conditioning
Where is the APU typically located on an aircraft?
A) Tail section
B) Under the cockpit
C) Inside the wings
A) Tail section
What is a primary check before APU operation?
A) Check fuel and oil levels
B) Inspect the cabin lights
C) Confirm autopilot is disengaged
A) Check fuel and oil levels
What does APU stand for?
A) Auxiliary Power Unit
B) Aircraft Power Utility
C) Air Pressure Unit
A) Auxiliary Power Unit
How is the ground air cart connected to the aircraft?
A) Through a 4-inch diameter hose
B) With an electrical cable
C) Using a hydraulic line
A) Through a 4-inch diameter hose
What is the purpose of a ground air cart?
A) To refuel the aircraft
B) To supply air for engine starting and air conditioning
C) To provide electrical power to the aircraft
B) To supply air for engine starting and air conditioning
What should be checked before starting the APU?
A) Fuel level and oil quantity
B) Brake pressure
C) Wing flap settings
A) Fuel level and oil quantity
