AirConditioning and Pressurisation System Flashcards
1
Q
- The function of an air mass flow control valve is to
A) control the airflow out of the cabin
B) ensure that system differential pressure is not exceeded
C) maintain a reasonably constant air mass flow into the cabin at all altitudes
A
C) maintain a reasonably constant air mass flow into the cabin at all altitudes
2
Q
- In a Bleed Air air-conditioning system, the warm air supply is provided by
A) the engine exhaust heat
B) the gas turbine exhaust
C) the compressor of the gas turbine engine
A
C) the compressor of the gas turbine engine
3
Q
- The purpose of a mass flow controller is to
A) allow pilot to select the desired cabin altitude
B) ensure the cabin altitude remains constant during cruise at all altitudes
C) ensure that a constant mass of air is delivered to cabin at all times
A
C) ensure that a constant mass of air is delivered to cabin at all times
4
Q
- The mass flow delivery from engine driven blowers is controlled by
A) engine speed variations
B) automatic control devices
C) spill valves
A
C) spill valves
5
Q
- The purpose of a ‘Spill’ valve in a cabin air supply system is
A) to give a heating effect
B) to spill overboard excess air delivered at S.L. (Sea Level) and lower altitudes
C) to relieve the pressure in the air supply ducting to atmosphere
A
B) to spill overboard excess air delivered at S.L. (Sea Level) and lower altitudes
6
Q
- Air conditioning systems
A) Increase the temperature of air
B) increase and decrease the temperature of air
C) decrease the temperature of air
A
C) decrease the temperature of air
7
Q
- An air-to-air heat exchanger is provided to
A) reduce the air supply temperature
B) increase the air supply temperature
C) provide an emergency ram air supply
A
A) reduce the air supply temperature
8
Q
- Temperature control of cabin air is achieved by
A) regulating the amount of air by-passing the cooling system
B) varying the ambient airflow to the heat exchanger
C) controlling the water vapour in the supply
A
A) regulating the amount of air by-passing the cooling system
9
Q
- In pressurized aircraft, temperature conditioning is mainly achieved by
A) adding heat to the pressurising air
B) extracting heat from the pressurising air
C) varying cabin pressure
A
B) extracting heat from the pressurising air
10
Q
- Heating for pressure cabins is obtained from
A) air supply heated by the pressurising process
B) only by adding heat electrically to the air supplies
C) driving the units compressor
A
A) air supply heated by the pressurising process
11
Q
- A cold air unit allows for cabin temperatures to be
A) a little more than ambient air temperature
B) same as ambient temperature, despite compression heating
C) lower than ambient air temperature despite compression heating
A
A) a little more than ambient air temperature
12
Q
- In a Boot-Strap Air Conditioning supply system the source of compressed air is from
A) gas turbine compressor bleed air
B) gas turbine intake ram air
C) ram air at the wing leading edge
A
A) gas turbine compressor bleed air
13
Q
- The effective temperature of a cabin is given by
A) temperature and humidity
B) temperature, humidity, thermal inertia and heat load
C) temperature only
A
A) temperature and humidity
14
Q
- An air cycle machine turbine
A) drives compressor to pressurise aircraft
B) drives compressor to increase temperature
C) drives compressor to decrease temperature
A
B) drives compressor to increase temperature
15
Q
- As an aircraft descends from cruising altitude (34,000ft), the cabin altitude must
A) stay the same
B) increase
C) decrease
A
C) decrease
16
Q
- The basic system of cabin pressurisation is to arrange a constant
A) inlet and outlet
B) outlet and vary the inlet
C) inlet and vary the outlet
A
C) inlet and vary the outlet
17
Q
- Control of rate of change of cabin pressure is
A) more important in descent
B) equally important in ascent and descent
C) more important in ascent
A
A) more important in descent
18
Q
- A comfortable rate of cabin altitude climb for passengers is
A) 500 ft per min
B) 300 ft per min
C) 100 ft per min
A
A) 500 ft per min
19
Q
- Cabin pressure is maintained by
A) controlling the supply of air to the cabin
B) controlling the amount of air discharged from the cabin
C) controlling the output of the compressor
A
B) controlling the amount of air discharged from the cabin
20
Q
- Pressurisation control ensures that
A) pressurisation does not start before aircraft is above 8,000 ft.
B) at operational altitude the cabin altitude is below 10,000 ft
C) the cabin is always maintained at sea level
A
B) at operational altitude the cabin altitude is below 10,000 ft
21
Q
- The principle of cabin pressurisation is
A) cabin altitude climbs eventually to that of the aircraft
B) whilst the aircraft climbs to altitude, the cabin climbs to a lower altitude
C) cabin altitude will always maintain a constant differential to that of aircraft altitude
A
B) whilst the aircraft climbs to altitude, the cabin climbs to a lower altitude
22
Q
- If an aircraft is operating at 40,000 ft. the pressurization ensures that
A) the cabin pressure is equivalent to an altitude of less than 10,000 ft.
B) sea level pressure is maintained in the cabin
C) the cabin pressure is progressively increased until the operational height is reached
A
A) the cabin pressure is equivalent to an altitude of less than 10,000 ft.
23
Q
- To what position is the inward relief valve spring loaded?
A) Closed
B) Open
C) Both position
A
A) Closed
24
Q
- A safety valve will normally relieve at
A) lower differential pressure than the discharge valve
B) negative differential pressure
C) higher differential pressure than the discharge valve
A
C) higher differential pressure than the discharge valve
