Questions for ATPL Exams
021 Airframes, Systems & Powerplant
For the correct contents of these files no guarantee can be given.
When leaning the mixture for the most economic cruise fuel flow, excessive leaning will cause...
a)* high CHT and EGT
b) high MAP
c) low CHT and EGT
d) high RPM
In addition to energy storage, the accumulator in a hydraulic system is used...
a) for storage of fluid
b) for storage of pressure
c) as pressure relief valve
d)* for dampening excessive pressure surges
With power changes on an engine with constant speed propeller, wrong combination of MAP and RPM causes excessive pressures in the cylinders. This is caused by...
a)* high MAP low RPM
b) low MAP high RPM
c) high MAP high RPM
d) low MAP low RPM
In a modern airliner, the maximum differential pressure is usually...
a) 3.5 psi
b)* 9 psi
c) 13.5 psi
d) 15.5 psi
On a propeller driven aircraft, the torque is measured...
a) on the camshaft
b)* in the gear box between the engine and the propeller
c) In the auxiliary gear box
An unloaded lead-acid battery can be detected through the following property...
a) the electrolyte tends to "boil"
b)* the voltage decreases under load
c) the voltage increases
d) the current increases due to a voltage decrease
The VOR has a wavelength which is...
a) centimetric
b) decimetric
c)* metric
d) hectometric
What is important for internal cooling of a reciprocating engine, regardless of RPM at a given PWR setting?
a) rich fuel/air mixture
b) lean fuel/air mixture
c) a good working thermostat
d)* a circulation of lubricating oil
A diluter demand oxygen regulator...
a)* gives airflow when inhaling
b) gives airflow only above FL100
c) mixes air and oxygen in the passenger's mask
d) is to use only when there is smoke in the cabin
The warning system indicating a too high cabin altitude starts at...
a) 8'000 ft
b)* 10'000 ft
c) 12'000 ft
d) 14'000 ft
The color of synthetic oil is...
a) pink
b) blue
c)* purple
d) red
Wing anti-ice system on modern aircraft is...
a) electrical
b) chemical
c)* thermal (hot air)
d) mechanical
What type are passenger emergency oxygen masks?
a) continuous flow, can be used with smoke
b)* continuous flow, cannot be used with smoke
c) on demand, can be used with smoke
d) on demand, cannot be used with smoke
Load sharing between 2 A/C generators in parallel...
a)* both real and reactive loads must be matched
b) only real loads must be matched
c) only reactive loads must be matched
d) no influence
Where are Krueger flaps located?
i) leading edge
ii) trailing edge
iii) wingroot
iv) wingtip
a) i only
b) ii only
c) i & iv
d)* i & iii
Vapour lock in a fuel system occurs.
a) due to water in the lines, freezing at low temperatures
b) due to burnt gases in the exhaust
c) as a phenomenon of enriching after incorrect application of the carburator heat
d)* due to heat and subsequent forming of vapour plugs in the fuel lines
A capacitance fuel gauge system measures...
a)* dielectric change fuel/air
b) resistance variation of fuel
c) density change of fuel
Rich mixture during climb causes...
a) higher torque
b) higher efficiency
c)* lower CHT
d) slight loss of power
Oxygen for the flight crew is stored...
a) liquid
b)* gaseous
c) chemical
d) chemical/gaseous
The use of a barometric adjusted fuel controler is to...
a) increase the fuel-to-air ratio when altitude
is increasing
b) decrease the fuel-to-air ratio when
altitude is increasing
c) maintain the fuel-to-air ratio
constant whatever the altitude is
d)* maintain a constant weight
fuel-to-air ratio when altitude is increasing
In an airline transport aircraft, the emergency exits must be designed so that...
a) 50% of the pax can evacuate through 50% of
the exits in 20 seconds
b) all pax can evacuate in 2 minutes
through 50% of the exits
c)* all pax and crew can evacuate
through 50% of the exits in 90 seconds
The supply on demand diluter oxygen systems are.
a)* normally set to 100% oxygen
b) increasing oxygen when altitude is
increasing
c) decreasing oxygen when altitude is
increasing
On a quickdonning mask the oxygen diluter in normal will affect the air/oxygen ratio in the following.
a)* increase
air/oxygen ratio when ALT increases
b) decrease air/oxygen ratio when ALT
increases
c) 100% oxygen
C/B's are used...
a) only
in a DC circuit
b) only in a DC circuit
c)* in AC and DC circuits
d) are never necessary
A fusible plug in a tire is provided...
a) to
release overpressure
b)* to release pressure caused by excess
of heat
c) to release overpressure from the discbrakes
d) to release overheat from the
discbrakes
The air conditioning system takes bleed air from the...
a) first
fan blade stage
b) low pressure compressor
c)* high pressure compressor
d) low pressure compressor first and if
necessary from the high pressure compressor
When TAS increases the blade angle of attack of a constant speed propeller.
a) increases
b) decreases
c)* remains constant
d) first decreases then increases
The air-cycle cooling system produces cold air by...
a) routing conditional air through the cooling fan
b) passing heated air through a compressor
c) passing air through cooling coils that contain a refrigerant
d)* extracting heat energy across an expansion turbine
What is the function of a static inverter?
a) change
polarisation
b) change alternate current into direct
current
c) for static discharge
d)* change direct current into alternate current
You add current on a conductor which is placed in a magnetic field. What happens?
a) nothing until the conductor is moved
b)* there will be a force excerted on
the conductor
What happens in a continuous fire loop detector if temperature increases?
a) pressure increases
b) resistance inverses
c)* resistance decreases
d) resistance increases
What is the friction coefficient, when an aircraft is hydroplaning?
a)* 0
b) 0,1
c) 0,5
d) 1
The igniters should be on...
throughout the whole operation
2) during acceleration
3) at ground start
4) at inflight relight
5) during turbulences
6) during precipitation and icing
a) 1
b) 3
c) 2,3,4
d)* 3,4,5,6
What is the use of the mixture control?
a) decrease the fuel in the fuel/air mixture
due to increase of air density
b)* increase the fuel in the fuel/air
mixture due to increase of air density
c) decrease of fuel flow
d) increase of fuel flow
What is the relationship between the octane grade and the compression ratio?
a)* the higher the octane number, the higher the
compression ratio
b) the higher the octane number, the
lower the compression ratio
c) the lower the octane number, the higher
the compression ratio
d) the compression ratio is independent
of the octane number
Cabin altitude increases while the aircraft is flying level. The differential pressure...
a)* decreases
b) increases
c) remains the same
d) may exceed maximum differential pressure
On piston engines, carburator icing...
a) only occurs at OAT's below +10°C
b)* may occur above +10°C
c) only occurs at OAT's below freezing level of water
d) only occurs at OAT's below freezing level of fuel
When combustion gases are directed through the turbine of a turbocharger, their...
a) temperature increases
b)* velocity decreases
c) pressure increases
d) pressure decreases
A continous element of a fire detector loop is heated:
resistance increases
resistance decreases
leaking voltage increases
leaking voltage decreases
a)
b)* 2,3
c) 2,4
d)
Required number of megaphones for commercial airplanes with 61 passenger seats:
a) none
b) 1 if at least 35 passengers on board
c)* 1
d) 2
Required number of axes or crowbars for a commercial airplane over 5700 kg with more than 9 and less than 200 seats:
a)* one axe or crowbar in the cockpit
b) one axe in the cockpit and one crowbar in the cabin
Why is the hydraulic fluid/oil in front of the pump pressurized?
a)* to avoid cavitation in the pump
b) to avoid vapour lock in the pump
When starting to get bleed air from a compressor stage, with constant fuel flow, the turbine temperature...
a)* increases
b) decreases
c) remains constant
d) depends on the RPM and number of compressor stage
What type are fuel booster pumps?
a)* centrifugal low pressure pumps
b) centrifugal high pressure pumps
c) variable blade type low pressure pumps
d) variable blade type high pressure pumps
Which of the following may cause detonation?
a) delaying the ignition time
b)* excessive lean fuel/air mixture
c) increase compression ratio
d) the use of a high octane rating as compared to a low octane rating
The cabin pressure regulator regulates:
max differential pressure
max cabin altitude
max cabin altitude rate-of-change
balance between cabin and ambient pressure
always the same differential pressure
a)* 1, 2 and 3
b) 1, 2 only
c) 2, 5 only
d) 3, 4 and 5
Anti-ice equipment on transport aircraft:
engine air inlet and rod
windshield
pitot tube
wings leading edge
cabin windows
wing trailing edge and flaps
a)* 1, 2, 4, 5
b) 1, 2, 3
c) 1, 2, 4, 5, 6
d) 3, 4, 7
Angle of a 3-phase generator?
a)* 120°
Shortly after engine start with no other electrical systems on, the battery-load-ammeter shows high:
a) the generator failed, cut down the engine!
b) the battery failed, stop the engine!
c)* this is normal and can be disregarded, as long as the reading doesn't stay that high for a longer period
d) can be totally disregarded
In case of a main hydraulic system failure, the RAT provides hydraulic power to...
a)* flight controls to steer the aircraft
b) flaps extension
c) gear extension
d) nose wheel steering on ground
A storage device in a computer is:
a) screen
b) keyboard
c)* harddisk
In a compensated capacitance fuel measuring system the mass of fuel is 800 lbs. Due to temperature increase the volume increases by 5%. The indicated mass will be...
a)
b)
c)* constant
d) + 10%
Concerning quick donning oxygen masks, radio telephony can be maintained as follows:
a) receive only
b) transmit only
c)* receive and transmit
What is the 'cabin ROD'?
a)* an increase in cabin pressure
b) a decrease in cabin pressure
c) it's the same as the aircraft ROD
d) it's not possible at a constant altitude
What is an EPROM?
a read-only memory
a writeable memory
it erases the memory if the power is disconnected
it keeps the memory if the power is disconnected
What combination describes it best:
a)
b)* 1+4
c)
d)
A relay is...
a) an electrical security device
b) an electrical power conversion
c)* an electro-magnetic operated switch
d) only for AC
Where does most of the power brake system pressure come from?
a) pedals
b)* main hydraulic system
c) engine driven hydraulic pump
d) actuator
Effect of the carburator heater:
a) air density increase, mixture becomes leaner
b) air volume increase, mixture becomes leaner
c)* air density decrease, mixture becomes richer
d) air volume decrease, mixture becomes richer
Ionization detectors can detect.
a)* fire (smoke)
b) heat
c) fire and heat
Braking action "poor":
a)* 0.25
b) 0.27
c) 0.30
d) 0.42
What is the wavelength of VHF?
a) cm
b) dm
c)* m
c) hectometer
How can you recognize that a battery is low?
a) boiling of fluid
b) volt increase
c)* volt decrease
c) current increase
Air cycle machine. The turbine.
a)* drives the compressor
b) increases the pressure
How do you fight a magnesium fire?
a)* with sand
b) with water
c) with halon
d) with CO2
What is the wavelength of the NDB with 300kHz?
a) 1 m
b) 10 m
c) 100 m
d)* 1'000 m
A turbocharger is driven by.
a) electric motor
b) hydraulic
c)* exhaust gases
Hottest temperature in engine is found in the.
a)* combustion chamber
b) exhaust
The function of a NOT logic gate within a circuit is to.
a) ensure the input signal is AC only
b) ensure the input signal is DC only
c) ensure the output signal of the same state as the input signal
d)* invert the input signal so that the output is always of the opposite state
Which of these signals at least are inputs, which the stall warning is composed of?
a) angle of attack, flaps, spoiler
b)* angle of attack, flaps, slats
c) angle of attack, flaps, EPR, N1
d) angle of attack, flaps, EPR
How is a firewire alert system tested?
a)* the wire and the warning are tested
b) only the warning function is tested
c) output of the wiring and total heat
d) wire is totally heated
What is a continuous-loop-detector?
a) smoke detector
b)* fire detector
When does a pilot usually use the autofeather system?
a)* during T/O
b) during landing
c) during cruise
d) during T/O and landing
A "tyre-burst" is prevented by.
a) a water cooling system
b)* a hollow screw in the wheel, ... (thermal fuse)
c) a thermal relief valve
d) the anti-skid system that prevents excessive breaking, resulting in an overheat of the brakes
In a single-spool gas turbine, the turbine RPM compared to the compressor RPM is.
a) greater
b)* equal
c) less
d) independent of the compressor RPM
In an A/C circuit with a series of capacitors, when the frequency of the A/C is increased, the current in the circuit will.
a)* increase
b) decrease
c) remain the same
What cannot be influenced by an airconditioning system?
a) pressure
b) humidity
c) temperature
d)* purity
An accumulator in a hydraulic brake system is prepressurized with 1'200 psi. If an electrically hydraulic pump is switched on, producing a pressure of 3'000 psi, the pressure gauge of the gas containing compartment shows a pressure of
a) 1'200 psi
b) 1'800 psi
c)* 3'000 psi
d) 4'200 psi
The frequency of an A/C generator depends on.
a) the individual number of poles and the rotation speed of the moving parts
b)* the number of pole pairs and the rotation speed of the moving parts
c) the rotation frequency of the moving parts
Overheat detectors are located in.
a)* the wheel well
b) fuel tanks
c) cabin
d) tyre
In an aircraft with 180 passenger seats (30 rows, 2 blocks with 3 seats each block) the number of oxygen masks is at least.
a)* 110% of passenger seats
b) for each passenger seat plus one mask in each row
c) for each passenger seat plus one mask for each seat block
d) 150% of passenger seats
There are 60 persons (passengers and crew) on board a turbo-prop aircraft. The aircraft is cruising at a speed of 240 KT and is about to fly over water, so that, at the maximum time to reach an emergency alternate aerodrome is 01:45 hrs. The emergency equipment has to comprise.
a) 60 life jackets
b) 60 life jackets plus 2 slides/rafts for 30 persons each
c)* 60 life jackets plus 3 slides/rafts for 30 persons each
d) 60 life jackets plus 2 slides/rafts for 20 persons each and one for 30 persons
Which capacity of the sliderafts are required for flights over water?
a) for each person on board plus 10 %
b)* all persons on board, considering 1 raft of the highest capacity is unusable
Why are temperature limitations given for turbo-jet engines?
a) to prevent damage to the combustion chamber
b) to prevent damage to the nozzle guide vanes (prevent excessive creeping)
c)* to prevent damage to the turbine blades
What happens, if the waste gate is seized in a descent?
a) the turbine blades desintegrate
b) the compressor blades desintegrate
c)* the maximum MAP will be exceeded
d) the turbine shaft will shear
What type of smoke detectors are used in modern large transport aircraft?
a) electrical type
b)* optical or ionization type
c) machanical type
d) chemical type
How is emergency gear extension provided in a heavy transport aircraft?
a) pneumatically
b) hydraulically
c)* mechanically
d) electrically and mechanically
If you use two 12V batteries with 40 Ah each in series, the total capacity will be.
a) 12V, 40 Ah
b)* 24V, 40 Ah
c) 12V, 80 Ah
d) 24V, 80 Ah
How is the fire alert for engine fire provided?
a)* fire warning for each engine plus one common bell
b) fire warning for each engine plus one bell for each engine
c) one fire warning for both engines plus one bell for each engine
d) one fire warning for both engines plus one common bell
How are the engine fire extinguishers discharged?
a) automatically
b)* by the pilot
c) automatically after a delay (if the pilot didn´t react)
91. Above which flight altitude does at least one pilot have to wear an oxygen mask?
a) FL 250
b) FL 300
c)* FL 410
d) FL 490
What kind of oxygen systems are normally found on large transport aircraft?
a) one system for all persons on board
b) two systems for all persons on board
c)* two independant systems, one for the cockpit, one for the cabin
What is necessary for paralleling independant operating GEN´s?
a) the phase relationship is of no importance
b)* the GEN´s have to be synchronized
c) the GEN´s have to have a constant phase difference of 120°
d) the GEN´s have to have a constant phase difference of 240°
In a circuit with two resistors (R1, R2) in parallel, the equal resistance (Req) in the circuit is.
a) Req = R1 + R2
b) Req = 1/ R1 + 1/ R2
c)* 1/ Req = 1/ R1+ 1/ R2
d) 1/ Req = R1+ R2/ R1* R2
If an electrical supply unit gives "open circuit", .
a) due to the increas of current, the CB popps
b)* the continuity is interrupted, the services will stop operating
c) the load, shown on the ammeter will rise significantly
In a non stressed skin wing construction, which part takes the bending forces?
a) the skin
b) the ribs
c)* the spars
A rich fuel/air mixture has a weight ratio of.
a)* 1/9th
b) 1/12th
c) 1/15th
d) 1/20th
What happens if there exists an excessive rich mixture?
a)* black smoke
b) white smoke
c) CHT rises
d) a purple flame can be seen coming out of the exhaust pipe
What increases the skip distance of HF transmission waves?
a) a lower frequency and a lower ionospheric layer
b) a lower frequency and a higher ionospheric layer
c) a higher frequency and a lower ionospheric layer
d)* a higher frequency and a higher ionospheric layer
The efficiency of a constant speed propeller compared to a fixed-pitch-propeller is.
a) always better
b)* constant over a wide range of operation
c) better over the whole range of operation
d) better in cruise
With a constant throttle and RPM lever setting in a climb,.
a) the RPM will rise
b) the MAP will rise
c) the RPM will decrease
d)* the MAP will decrease
What kind of basic logical element is shown here?
a)
a NOR-gate
b) a NAND-gate
c)* a NOT-gate or an inverter
d) a XOR-gate
Which one is a peripheral output device for a computer?
a) keyboard
b)* screen
c) disk drive
d) hard disk drive
Which device is necessary to charge a battery in an AC current electrical system?
a) an inverter
b)* a transformer-rectifier unit
Why is there a fuel heating upstream of the filter?
a) to prevent ice, forming due water in the fuel
b)* to prevent the forming of ice crystals in the filter due low temperature of the fuel
c) to improve the burning process in the combustion chamber
What happens in the diffuser of a centrifugal compressor?
a) pressure increase, increase in velocity
b)* pressure increase, decrease in velocity
c) pressure decrease, increase in velocity
d) pressure decrease, decrease in velocity
The static pressure error at the static vent is most affected by.
a) temperature
b) ambient pressure
c)* mach number
After a malfunction in an electrical circuit a popped circuit breaker.
a) resets automatically after the fault has been rectified
b)* can be reset manually after the fault has been rectified
c) resets itself after a certain time has passed
d) can only be reset on ground
EPR is the relation of.
a) turbine inlet pressure to turbine discharge pressure
b) compressor discharge pressure to turbine inlet pressure
c) compressor inlet pressure to turbine discharge pressure
d)* turbine discharge pressure to compressor inlet pressure
In a fuel system, what is the purpose of the fuel/oil cooler?
a)* jet oil cooling porvided by a heat exchanger with fuel coming from the tanks
a) automatic fuel heating to prevent the formation of ice crystals
b) automatic fuel cooling
c) heating of the oil
Compressor baldes are loose on the ground but will not move anymore as the engine is running. This is due to.
a) thermal expansion
b) a system which is blocking the blades
c)* aerodynamical and centrifugal forces
What is conditioned air?
a)* air which is treated for pressure and temperature
b) air which is pressurized
c) air which is filtered
Before being indicated on the vibration indicator, vibrations are.
a)* filtered and amplified
b) only filtered
c) directly measured at the engine
d) are only amplified
An aeroplane with more than 61 seats is equipped with 3 fire extinguishers. How many of them must be of the halon type?
a)
b)* 1
c) 2
d) 3
What is recorded on a cockpit voice recorder?
communication exchanged by cabin crew
aural tones and warnings in the cockpit
communications between cockpit and ATC
only captain's communication
a) 1 only is correct
b) 1, 2 are correct
c)* 2, 3 are correct
d) 3, 4 are correct
When does the FDR stop recording?
a) when the aircraft touches down
b) when the aircraft cleares the runway
c)* when the aircraft cannot move any longer by its own power
Where do you have a drift of 15°/h?
a) 30°N
b) 45°N
c)* at the North Pole
d) at the Equator
On a stick shaker.
a)* the vibrations on the control stick are producing simulated buffeting
b) the vibrations on the control stick are natural buffeting prior to simulated buffeting
In a lead acid battery, when one cell is inoperative.
a) you have a loss of 1/12 of the voltage and capacity but the battery is still working
b) you have only a loss of 1/12 of the voltage but the battery is still working
c)* the battery is unservicable
How is EGT measured?
a) by the use of a bimetallic thermometer
b)* by the use of a thermocouple
Where is the CHT measured?
a) at the EGT
b) it is an average of all cylinder temperatures
c)* at the hottest cylinder
What is the rotating part in an AC generator?
a)* rotor
b) stator
c) slip ring
d) oscillator
If you use bleed air from the turbine, what will happen to the EPR and EGT?
a)* EPR is decreasing and EGT is increasing
b) both EPR and EGT are decreasing
c) both EPR and EGT are increasing
d) EPR is increasing and EGT is decreasing
What is cabin altitude?
a)* cabin pressure expressed in altitude
b) the altitude where the cabin is actually located
Smoke detectors are located in.
a) engine nacelles
b) wheel bay
c)* upper cargo compartments
What is the purpose of a T-tail?
a) to create a tail heavy tendency
b)* to prevent the tail being in wing turbulence
c) to decrease fuel consumption
d) to have better high speed characteristics
An aircraft must be provided with a fuel dump system when.
a) the aircraft MTOM is more than 5.7 t
b) the aircraft has more than 150 pax
c)* MTOM is significanty different form MLM
How is the pressurization system controlled?
a) bleed air valves
b) cabin relief valves
c)* cabin outflow valves
d) cabin inlet valves
If the outflow valves close in flight, the effect will be.
a)* pressure rise to maximum differential pressure
b) damage the skin
c) cease airflow automatically
Voltage regulators. If the load is reduced, what does the current in the exciter field do?
a) increase
b)* decrease
c) nothing
Fuel flow across feed valves can be used when.
in flight
on ground
engine supplied from any fuel tank
moving fuel from tank to tank
a) 1 only is correct
b) 1, 3 are correct
c) 1, 2, 4 are correct
d)* all of the avobe are correct
Which fuel tanks are heated?
a) wing
b) centre
c) all
d)* none
When are life jackets for adults inflated?
a) in the plane
b) in the water
c)* on leaving the plane
d) in the sea
Pneumatic boot de-icing on wing leading edge.
a)* lasts longer than 10 sec
b) has 10 cycles a second
c) prevents ice build up
What pressure does the booster pump supply fuel at?
a) 5 - 10 psi
b)* 20 - 50 psi
c) 300 - 500 psi
d) 3'000 - 5'000 psi
How can you realize that the aircraft is not bonded properly?
a) static on VOR
b)* static on VHF radio
c) corrosion on fuselage
The purpose of bonding is.
a) to protect against lightning
b) to prevent static
c) to keep the aircraft at zero potential
d)* to keep all parts of the aircraft at the same potential
Shimmy is.
a)* sinusodial tracking on the runway
b) when the pilot looses control
c) a torque link
d) an accumulator in the steering contol
Feeding fuel is pressurized to.
a) prevent vapour lock
b)* prevent cavitation
c) keep a constant fuel flow in negative g's
d) prevent fuel icing
The power output of a piston engine can be calculated by.
a) force times distance
b) work times velocity
c)* torque times RPM
d) pressure times arm
Pulling the fire shut off handle causes a number of devices to disconnect. In respect of the AC generator it can be said that the.
a) generator breaker opens
b) exciter control relay, the generator breaker and the tie breaker opens
c) exciter control relay opens
d) exciter control relay and the generator breaker opens
A fan stage of a ducted fan turbine engine is driven by.
a) high pressure turbine
b) airflow across it by the high pressure compressor
c)* the low pressure turbine
d) the high pressure compressor through reduction gearing
The propeller blade is twisted in order to.
a)* keep the local angle of attack constant along the blade
b) allow higher mechanical stress
c) avoid appearance of sonic phenomena
d) decrease blade tangetial speed from the blade root to the tip
What is the voltage level of a fully charged lead-acid battery?
a) 1.8 V
b) 1.4 V
c)* 2.2 V
d) 1.2 V
A magnetic circuit breaker.
a)* is a quick tripping response protective system
b) permits overvoltage for a short period of time
c) has a slow response time
d) can be reset without danger
The purpose of ditching control is to.
a)* close the outflow valve
b) open the outflow valve
c) direct pressurized air to floatation bags
d) achieve rapid depressurization
FL 390, maximum permissable passengers by certification is 230. number of seats is 200, scheduled number of passengers is 180. What is the minimum number of inhaler systems in the cabin?
a)
b)
c)* 220
d) 253
Protective breathing equipment.
a) protects crew against depressurization
b)* protects crew against fumes and noxious gases
If a CSD is disconnected during flight, it.
a) may be reset using the reset mechanism
b)* may be reset on the ground only after engine shutdown
Where are the overheat detectors located in the hydraulic system?
a) in the fuel/oil cooler
b)* in the pumps
c) in the reservoir
The purpose of a trim tab device is to.
a)* reduce or cancel control forces
b) trim the aeroplane during normal flight
c) trim the aeroplane during low speed flight
d) lower manoeuvring control forces
Which type of fire extinguisher should be used for inflammable gaseous materials like propane?
a) CO2. water
b)* BCF, CO2
c) dry powder, water
d) water only
The fuel temperature at which the vapour ignites in contact with flame is the.
a)* flash point
b) self ignition point
c) combustion point
d) fire point
The conditions for the highest engine power are.
a) cold air
b) humid air
c) high pressure
d)* cold, dry air and high pressure
The output of a generator is controlled by.
a) the reverse current circuitbreaker
b)* varying the field strength
c) engine speed
d) varying the length of wire in the armature
In commercial transport aircraft the landing gear operating system is usually.
a) electrical
b)* hydraulic
c) mechanical
d) pneumatic
The most widely used frequency in aircraft is.
a) 50 Hz
b) 60 Hz
c) 100 Hz
d)* 400 Hz
Fan markers use.
a) centrimetric wavelengths
b) millimetric wavelengths
c)* metric wavelengths
d) hectometric or kilometric wavelengths
For a frequency of 121.95 MHz, what is the wavelength?
a) 2.46 cm
b) 2.46 mm
c) 2.46 km
d)* 2.46 m
MLS equipment uses.
a)* centimetric wavelengths
b) millimetric wavelengths
c) metric wavelengths
d) kilometric wavelengths
ADF uses.
a)* hectometric or kilometric wavelengths
b) metric wavelengths
c) millimetric wavelengths
d) centimetric wavelengths
A fuse is rated by.
a) its resistance in ohms
b)* the current amperage it will carry
c) the volts it will carry
d) the wattage it will pass
A 400 Hz asynchronous motor with 4 poles will rotate at.
a) 1600 RPM
b) 8000 RPM
c)* 12000 RPM
d) 24000 RPM
The anti-skid system will.
a)* reduce brake pressure to slower turning wheels
b) reduce brake pressure to faster turning wheels
c) increase brake pressure to slower turning wheels
d) increase brake pressure to faster turning wheels
In modern aircraft the hydraulic oil is.
a) mineral
b) vegetable
c) water and glycol
d)* synthetic
Why are low pressure fuel pumps submerged in fuel?
a)* to keep them cool
b) to prime them
c) to reduce the length of the fuel line
A hydraulic system is a.
a) high pressure, high flow system
b)* high pressure, low flow system
c) low pressure, high flow system
d) low pressure , low flow system
What component converts hydraulic pressure into linear motion?
a) accumulator
b) reservoir
c) pump
d)* jack/actuator
The low pressure switch in a hydraulic system will indicate a warning if.
a)* the pressure coming out of the pump is too low
b) the accumulator is deflected
c) the reservoir is too low
What is the purpose of a crash axe?
a) to assist in emergency exiting
b)* to pry a panel back to fight a fire
c) to restrain a passenger who is gettin violent
If an artificial feel unit is fitted it would be connected.
a) in series with the primary controls
b)* in parallel with the primary controls
A twin jet aircraft would normally be refuelled by which of the following methods?
a)* pressure refuelling
b) suction refuelling
c) open line refuelling
d) overwing refuelling
The advantage of a float type gauging system is.
simple
compensates for variations of SG
reads fuel quantity by mass
compensates for change of aircraft attitude
a)* 1 only
b)
c)
d)
If a fuel tank having a capacitive contents gauging system is empty of fuel but has a quantity of water in it.
a) the gauge will show the mass equivalent to that which would have been indicated with fuel in
b)* the gauge will show full scale high
How are escape slides inflated?
a)* self contained gas bottle
b) fed from bleed air system
c) hand pumped by cabin crew
The flight deck warning on activation of a fire detection system is a.
a)* warning light and warning bell
b) gear warning
c) warning bell
d) warning light
Hydraulic reservoirs are pressurized by.
a)* engine bleed air from turbine engine
b) seperate helium gas system
c) air from the air conditioning system
d) in flight only
A shuttle valve will.
a) reduce pump loading
b)* automatically switch to a more appropriate source of hydraulic supply
If the cabin pressure tends to decrease below ambient.
a) the inward relief valve closes
b) the outflow valve opens
c)* the inward relief valve opens
An undercarriage leg is locked when.
a)* mechanically locked by an over-centre mechanism
b) amber light is on
c) it is down
d) actuating cylinder is at the end of its travel
What happens to an underinflated tyre on a dry runway?
a)* increased wear on the shoulder
b) increased wear on the crown
c) decreased viscous aquaplaning speed
What is the purpose of inboard ailerons?
a)* to reduce wing twist at high speed
b) to reduce wing bending at high speed
c) to reduce wing twisting at low speed
d) to reduce wing bending at low speed
Smoke hoods protect.
a)* full face, continuous flow
b) mouth and nose, continuous flow
c) full face, demand oxygen
d) mouth and nose, demand oxygen
In a fan jet engine the bypass ratio is.
a) internal mass airflow divided by external mass airflow
b) internal mass airflow divided by mass fuel flow
c)* external mass airflow divided by internal mass airflow
d) external mass airflow divided by mass fuel flow
In a very cold weather, the pilot notices a slightly higher than normal oil pressure on start up.
a) this is abnormal - engine must be shut down immediately
b)* this is normal - providing it decreases after start up
c) it indicates that an oil change is required
d) is abnormal - but does not require the engine to be shut down
If the temperature gauge of the CSD is in the red, what action would be required?
a) auto disconnect
b) throttle back and allow to cool down
c) disconnect and when cooled reconnect
d)* manually disonnect and reconnect on the ground
How do you test a battery on an aircraft with a voltmeter?
a)* on load
b) off load
Using a medium frequency band, when is fading likely to occur? During.
a) daytime and raining
b) nighttime and raining
c) daytime with sky and ground waves
d)* nighttime with sky and ground waves
If the load increases on a constant speed generator, what does the voltage regulator do?
a)* increase the field excitation
b) decrease the field excitation
c) voltage regulator cannot change the field excitation
The frequency of an AC generatoris dependent upon.
a) poles only
b) RPM only
c)* poles and RPM
The principle of operation of a firewire is.
a) positive coefficient of resistance, negative coefficient of capacitance
b)* positive coefficient of capacitance, negative coefficient of resistance
c) current leakage
A magneto is switched off by.
a) grounding the primary circuit
b) open the primary circuit
c) grounding the secondary circuit
d) open the secondary circuit
What is the difference between: 1) fuse and 2) CB?
a) 1 and 2 are resettable
b)* only 2 is resettable
c) the fuse is used for high current application and the CB for low
d) the fuse fails at a higher current
What is the purpose of a differential cut-out?
a)* it ensures that the generator voltages are nearly the same before they come on line
b) it ensures that one generator comes on line before the other
What type of motor is best used for starting engines?
a) shunt wound motor
b) compound wound motor
c)* series wound motor
d) induction motor
A tubeless tyre has.
a built in air tube
no built in air tube
a crossed ply construction
a radial ply construction
a) 2, 4 are correct
b) 1, 4 are correct
c) 1, 3 are correct
d) 2, 3 are correct
If an A/C GEN is overexcited, the.
a)* tie braker popps
b) tie braker and the GEN braker pop
c) tie braker and the GEN exciter braker pop
d) GEN exciter and GEN braker pop
The voltage regulator of a DC generator is connected in.
a) series with the armature and in parallel with the shunt field
b)* parallel with the armature and in parallel with the shunt field
c) series with the armature and in series with the shunt field
d) parallel with the armature and in in series eith the shunt field
APU provides.
a) air conditioning and electrical power on the ground
b)* air conditioning and electrical power on the ground and hydraulic back up in flight
On the ground, a system is preventing the retraction of the landing gear. It is.
a) a bolt
b) an aural warning
c) a system connected on the WOW
d)* a latch on the gear lever
If two AC generators are connected in parallel, the reactive loads are balanced by.
a) the frequency
b) the torque of the CSD
c)* the energizing current
d) the voltage
On a jet aircraft the fuel heaters are.
a) not necessary at all
b) installed in each tank
c)* located in the engines
d) installed only in the center tank
Measured output power units of a constant frequency AC system are.
a) volt and ampere
b) ampere and kilowatt
c)* kVar and kVa
d) volt and kilowatt
If the strength of a radio signal decreases away from the transmitter, this effect is called.
a)* attenuation
b) ducting
The components of the damping system on a large aircraft undercarriage are.
a) nitrogen / oxygen mix
b)* viscous liquid and nitrogen
c) helium
Fragments of questions...
You have to know the technical principle of fire- and smoke detection systems!
You have to know the relationship between outside pressure and cabin pressure!
You have to know all about oxygen supply!
You have to know all about alternators and generators (important)!
You have to know all about turbines!
You have to know all about propeller!
Why is a flow duct of a axial flow compressor tappered?
a)* to maintain a constant airflow velocity along the compressor
A fault protection fire loop.
a)* inhibits a fire warning if the loop is inadvertently grounded
A single loop detector (w/o fault protection) is inadvertently grounded. This.
a)* triggers a fire warning alert
What is necessary for paralleling DC generators?
a) same voltage
b)* reactive and real loads need to be matched
What causes carburator icing?
a)* the evaporation of fuel and temperature decrease by expansion of air in the venturi
During normal climb after take off.
a)* the cabin pressure decreases more slowly than the atmospheric pressure
Hot/direct buses are.
a)* direct connected to the battery
A 'reverse thrust door' warning light on the flight deck instrument panel illuminates when.
a)* the reverse doors are unlocked
The main function of a torsion link is to.
a)* avoid rotation of the position rod to the oleo strut
What is the purpose of the baffle check valves in the fuel tanks?
a)* to prevent fuel movement to the wing tip during manoeuvers
b) to damp out the movement of the fuel in the tank
What is a hung start?
a)* too less fuel is supported to the engine, N2 remains at approximately 35%
What is the definition of self-sustaining speed?
a)* RPM at which the starter unit can be switched off
The minimum height for door sills before a means of assisting escape is required is.
a)* 1.83 m
In a centrifugal compressor.
a)* the air enters the impeller axially at the eye and leaves at the periphery
What is the purpose of a hydraulic fuse?
a)* to prevent leakage if the line breaks
Where in the airconditioning system is the water separator located?
a)* after the cold air unit
What regulates the real load?
a)* the torque from the CSD
What fire extimnguisher would be used on a propane fire?
a)* foam
The purpose of a refuelling volumetric top off unit (VTO) is.
a)* to close the fuelling valve when the tank is full
The fan in a high by-pass ratio turbo jet engine produces.
a)* the greatest part of the thrust
What does a diffuser in a gas turbine do?
a)* convert kinetic pressure into static pressure
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