07/08/2020 Airframe & Systems
Airframe & Systems
Pneumatic, Pressurization, Ice and Rain, Oxygen, Smoke, Fire and Fuel
1. Name
Preet Agrawal
2. Batch
1912
2001B
2004
3. What is the purpose of the pack cooling fans in the air conditioning system?
(1 Point)
Supplying the heat exchangers with cooling air during slow flights and ground
operation.
Supplying the heat exchangers with cooling air during cruise flight.
Supplying the Passenger Service Unit (PSU) with fresh air.
Cooling of the APU compartment.
4. Which additional option regarding the fuel system may be necessary if an
aircraft is allowed to have a higher take-off weight than its landing weight?
(1 Point)
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The fuel system should have a fuel cross feed option
The fuel system should include a fuel jettison system
The fuel system should have additional electrical fuel pumps
The fuel system should have a fuel ventilation system
5. If a fuel sample appears cloudy or hazy, the most probable cause is:
(1 Point)
water contamination
anti-microbiological additives
mixing different fuel grades
oil in the fuel
6. In a manually operated system, the cabin altitude rate of change is normally
controlled by :
(1 Point)
a rate of change selector.
the difference between the altitude selected on the cabin pressure controller and
the aeroplane altitude.
the difference between the barometric pressure selected on the cabin pressure
controllerand ambient barometric pressure.
the duct relief valve when operating at the maximum cabin differential pressure
7. In case of smoke in the cockpit, the crew oxygen regulator must be set to:
(1 Point)
normal
emergency
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on demand.
8. In the cockpit of a transport airplane, at least one manual fire-extinguisher
must be conveniently located containing :
(1 Point)
halon.
powder
water
special fluids
9. The correct statement about rain protection for cockpit windshields is that :
(1 Point)
rain repellent should never be sprayed onto the windshield unless the rainfall is very
heavy
wipers are sufficient under heavy rain conditions to provide adequate view through
the cockpit windows.
the electric de-icing system for cockpit windows is also suitable for rain protection
the alcohol de-icing system for cockpit windows is also suitable for rain protection
10. The charged pressure of a portable oxygen cylinder is normally:
(1 Point)
500 psi
1200 psi
1800 psi
3000 psi
11. Cabin compressors:
(1 Point)
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increase their flow in cruise conditions
decrease their flow in cruise conditions
increase their flow in proportion to increases of altitude differential pressure and
reduction in engine rpm in order to maintain the mass flow
deliver minimum air at sea level via the cold air unit
12. The fuel system boost pumps are used to :
(1 Point)
avoid the bubbles accumulation and feed the lines with fuel for directing it to the
engine at a positive pressure
avoid the bubbles accumulation
feed the lines with fuel for directing it to the engine at a positive pressure
feed the fuel control units, which inject the pressurized fuel into the engine.
13. The requirement for an aircraft to have a fuel dumping system is:
(1 Point)
all aircraft in the Transport Category having a maximum take-off mass (MTOM) of 75
000 kg or greater
all aircraft manufactured after 1997 having a MTOM of 7500 kg or more
aircraft whose maximum landing mass (MLM) is significantly lower than its
maximum take-off mass (MTOM)
all aircraft with a seating capacity of 250 or more
14. When a wire type fire system is tested:
(1 Point)
the wiring and the warning are tested.
Only the warning function is tested.
a part of the wire is totally heated.
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the wire is totally heated.
15. The fuel tanks of a modern passenger airliner are filled by:
(1 Point)
gravity
fuel is sucked in by the aircraft pumps
fuel is pumped in by the fuel truck
the VTO system
16. Lubrication of an oxygen component thread is by:
(1 Point)
soap water
grease
oil
graphite
17. AVGAS:
(1 Point)
is coloured red for identification purposes
is coloured green if it is a leaded fuel and blue if it is a low lead fuel
has no artificial colouring and appears either clear or a straw yellow colour
can only be used in piston engines if oil is added to improve its anti-knock
properties
18. The passenger oxygen drop down mask stowage doors are released:
(1 Point)
barometrically operated latch
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electrically for chemical generator systems and pneumatically for gaseous systems
electrically for gaseous systems and pneumatically for chemical generator systems
by the cabin crew
19. A cabin pressure controller maintains a pre-set cabin altitude by regulating the
:
(1 Point)
position of the outflow valve(s).
mass air flow into the cabin.
position of the inward relief valve.
position of the duct relief valve(s).
20. The flight deck warning on activation of an engine fire detection system is:
(1 Point)
warning bell
gear warning
warning light and warning bell
warning light
21. Situation: A cabin is at 8000 ft and at maximum differential pressure (max diff).
What happens first when the aeroplane starts to climb?
(1 Point)
The outflow valve closes to keep the cabin at 8000 ft
The safety valve opens the outflow valve
The outflow valve opens to maintain max diff
The cabin altitude limiter closes the outflow valve when exceeding 15000 ft cabin
altitude
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22. A substance which may never be used in the vicinity or on parts of an oxygen
installation is :
(1 Point)
grease
water
halon
nitrogen
23. As regards passengers oxygen in public transport aircraft, information must be
given to passengers through a demonstration. If a flight is to be carried out at
Flight Level FL 290, this demonstration must be completed before :
(1 Point)
take-off
the aircraft reaches FL 100.
the aircraft reaches FL 140.
the aircraft reaches FL 250.
24. An airplane whose maximum approved passenger seating configuration is 201
to
300 seats must be equipped with at least:
(1 Point)
4 hand fire-extinguishers conveniently located in the passenger compartment.
3 hand fire-extinguishers conveniently located in the passenger compartment.
5 hand fire-extinguishers conveniently located in the passenger compartment.
6 hand fire-extinguishers conveniently located in the passenger compartment
25. A dump valve:
(1 Point)
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automatically opens when fuel is dumped
is controlled manually
is opened automatically when the safety valve opens
is controlled by the safety valve integrating line
26. How can one monitor the rate of change of cabin pressure?
(1 Point)
Check the cabin differential pressure indicator
Check the change in cabin altitude
Check the cabin vertical speed indicator
Monitor the difference between cabin altitude and aircraft altitude
27. The term “pressurization cycle” means:
(1 Point)
air introduced into a fuselage under pressure only
air introduced into a fuselage under pressure until the time the air is released
air discharged from the fuselage, above 15 psi
the frequency in Hz the pressure cycles from the rootes blowers enter the fuselage
28. In flight, the most commonly used anti-icing method for the wings of modern
commercial aircraft fitted with turbo-jet units is:
(1 Point)
Thermal (use of hot air).
Physical/chemical
chemical (glycol-based liquid).
Electrical (electrical resistances).
Mechanical (pneumatic source which acts by deforming the profiles of the leading
edge).
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29. The anti-ice or de-icing system which is mostly used for the wings of modern
turboprop aeroplanes is :
(1 Point)
Pneumatic boots.
Electrical heating.
Thermal anti-icing.
Fluid de-icing.
30. Smoke detectors fitted on transport aircraft are of the following type :
(1 Point)
optical or ionization
chemical
electrical
magnetic
31. Why does the bleed-air system make use of two compressor tappings?
(1 Point)
The LP tapping is used for low pressure consumers, the HP tapping for high
pressure consumers
The LP tapping is used at sufficiently high RPM’s; the HP tapping only at low RPM’s
The LP compressor tapping is used for air conditioning; the HP tapping for ice-
protection
The LP compressor tapping is used for internal purposes; the HP tapping for
external purposes
32. Which one of the following ice protection systems can only be used as a de-
icing system?
(1 Point)
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Mechanical
Electrical
Chemical
Thermal
33. In a turbo-compressor or bootstrap system the cooling air is:
(1 Point)
ram air
engine by pass air
cabin air
compressor air
34. What is the function of a negative pressure relief valve, which of them is
incorporated in a pressurisation system?
(1 Point)
To prevent the cabin pressure from becoming too high
To prevent the cabin pressure from becoming lower than the surrounding air
pressure
To prevent negative cabin altitudes
To prevent the cabin pressure from becoming higher than the surrounding air
pressure
35. The purpose of the baffles in an aircraft's integral fuel tank is to:
(1 Point)
Restrict the fuel from flowing to the wing tips during abnormal manoeuvre (side
slipping...).
Prevent overpressure in the tank.
Prevent the fuel from flowing in the vent lines
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Prevent mixture of the fuel and hydraulic fluid.
36. The cabin heating supply in a heavy jet transport aircraft is obtained from :
(1 Point)
hot air coming from the engine's compressors.
hot air coming from the engine's turbines.
a fuel heater system.
an electrical heater system
37. If an aircraft suffers decompression what happens to the indications on a cabin
VSI, cabin altimeter and differential pressure gauge?
(1 Point)
VSI up, altimeter up, differential pressure gauge down
VSI, altimeter, differential pressure gauge all unchanged
VSI down, altimeter up, differential pressure gauge down
VSI up, altimeter down, differential pressure gauge down
38. Gas turbine engines are most vulnerable to ice on the:
(1 Point)
Cowling
Air intake
Compressor blades
Fan blades
39. What happens if a gaseous oxygen cylinder is over-pressurized?
(1 Point)
A pressure relief valve vents the excess pressure into the atmosphere
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A bursting disc vents the complete contents of the cylinder(s) to atmosphere
A pressure regulator will prevent the excess pressure damaging the system
A pressure relief valve vents the excess pressure into the fuselage
40. The fuel supply system on a jet engine includes a fuel heating device, upstream
of the main fuel filter so as to:
(1 Point)
prevent, at low fuel temperature, the risk of ice formation from water contained in
the fuel.
maintain and improve fuel heating power.
ease low pressure pumps work by increasing fuel fluidity
prevent fuel from freezing in fuel pipes due to low temperatures at high altitude
41. A pressurization system works by:
(1 Point)
essentially constant input mass flow and variable output
essentially constant output mass flow and variable input
does not start until an altitude of 8000 ft has been reached
supplying hot gases from the engine exhaust unit to the mass flow control system
42. An aircraft is in straight and level flight at a constant cabin altitude when the
crew notice the rate of climb indicator reads –200 ft/min. What will be the
sequence of events?
(1 Point)
Crew should begin a climb to regain cabin altitude
Cabin altitude will increase to outside atmospheric pressure
Cabin altitude will descend to, and continue beyond normal max. diff., at which
point the safety valves will open
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Cabin altitude will increase to, and continue beyond normal max. diff., at which
point the safety valves will open
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