General Systems (GS)

Pregunta 1 de 64

1

Select the correct response(s):

Selecciona una o más de las siguientes respuestas posibles:

Water hammer is negligible in hydraulic system pipe installation.  
Water hammer is an important parameters which used to dimensionate pipes.
Hydraulic Pumps generally used in aircraft hydraulic systems are gear type and capable to  provide roughly same pressure at any flow demand (if below specified max flow demand).
Hydraulic Pumps generally used in aircraft hydraulic systems are piston type and capable to  provide roughly same pressure at any flow demand (if below specified max flow demand).
Acceleration of fluid is not negligible for the calculation of the necessary pressure of hydraulic pressurized reservoirs.

Explicación

Pregunta 2 de 64

1

If the aircraft hydraulic system supply the services that control the direction of the aircraft on the ground (e.g. nosewheel steering and differential braking):  

Selecciona una o más de las siguientes respuestas posibles:

, the emergency braking system must have differential control.
, consideration shall be given to supplying the nosewheel steering and normal brakes from different hydraulic systems.

Explicación

Pregunta 3 de 64

1

Common use Aerospace Hydraulic Pumps:

Selecciona una o más de las siguientes respuestas posibles:

when engine driven, are installed in engine gearbox. Its suction line and fire shut-off valve in suction line are fire proof tested
when engine driven, are installed in engine gearbox. Its suction line is fire resistant (5 min) and fire shut-off valve in suction line is fire proof tested (15 min).

Explicación

Pregunta 4 de 64

1

Common use Hydraulic Reservoirs :

Selecciona una o más de las siguientes respuestas posibles:

Do not need pressurization. Vented type reservoir is sufficient whenever located above the pump.
Utilizes the system pressure, acting on a differential piston, to achieve the required tank pressure.
The pressure required in the reservoir to supply fluid to the pump should be calculated using the guidelines in AIR1922.
This pressure must be sufficient to avoid pump cavitation at Pcrit.
Each reservoir should be equipped with pressure regulating valves and a filter.
No Hydraulic Reservoirs shall be located in a designated fire zone.

Explicación

Pregunta 5 de 64

1

CFG main advantages compared with VFG are:

Selecciona una o más de las siguientes respuestas posibles:

Better reliability.
Simpler
Cheaper.
Less volume and weight for for the same power delivered.
Several suppliers able to design and produce them.
Fixed output frequency, with fixed efficiency and capability.
No overvoltage event potentially leading to common failures.

Explicación

Pregunta 6 de 64

1

The emergency system shall power the services necessary to complete a flight and make a safe landing. The services to be powered must include:

Selecciona una o más de las siguientes respuestas posibles:

Those required for descent, approach and Landing.
Those required for immediate safety
Those required for continued controlled flight

Explicación

Pregunta 7 de 64

1

New high voltage levels (270 Vdc and 230 Vac) are applicable to civil and military electrical systems since they permit to:

Selecciona una o más de las siguientes respuestas posibles:

Increase hydraulic Systems.
Increase Electric Systems.
Increase Pneumatic Systems.
Increase Mechanical Systems.
Reduce electrical power demand.
Decrease the losses in the feeders and distribution wiring.

Explicación

Pregunta 8 de 64

1

Electrical power quality is determined by:

Selecciona una o más de las siguientes respuestas posibles:

The electrical consumers.
The interactions of all the electrical generation and supplied equipments.

Explicación

Pregunta 9 de 64

1

Li-Ion battery technology main advantages compared with Ni-Cd one are:

Selecciona una o más de las siguientes respuestas posibles:

Less susceptible to abuse conditions.
Less weight for the same power delivered.
Maintenance free and higher service life. This, plus the improved reliability, leads to an important Direct Maintenance Cost (DMC) reduction.
Better control of the SOC. No memory effect.
No mounting restrictions

Explicación

Pregunta 10 de 64

1

LED technology main advantages compared with HID one are:

Selecciona una o más de las siguientes respuestas posibles:

Higher reliability.
Higher maximum operating temperature.
Power consumption.
Cost.

Explicación

Pregunta 11 de 64

1

What of the following exterior lights have their illumination performances covered by the EASA Part 25 requirements?  

Selecciona una o más de las siguientes respuestas posibles:

Navigation lights.
Landing lights.
Turn-Off/Taxi lights.
Logo lights.
Anticolision lights (Beacon & Strobe).
Wing/Engine Scan Lights.

Explicación

Pregunta 12 de 64

1

The biggest problem in humans associated to exposure at high altitudes is:

Selecciona una o más de las siguientes respuestas posibles:

Reduction in temperature.
Reduction of O2 partial pressure.
Lack of oxygen (hypoxia)

Explicación

Pregunta 13 de 64

1

Aerodynamic heating is given, basically, by the total temperature of the air computed as follows Ttot = Tambient (1+ 0.2 Mach2). Given an ISA atmosphere, the heating is maximum in one of the following conditions:

Selecciona una o más de las siguientes respuestas posibles:

40 kft, Mach=0.8.
SL, Mach=0.4.

Explicación

Pregunta 14 de 64

1

Minimum standard ventilation to maintain CO2 levels in enclosed spaces is (at SL, 15ºC) according to ASHRAE:

Selecciona una o más de las siguientes respuestas posibles:

1.5 kg/min of air.
1 kg/min of air.
0.5 kg/min of air.

Explicación

Pregunta 15 de 64

1

Being one of the most efficient cooling systems, why liquid cooling is not so used:

Selecciona una o más de las siguientes respuestas posibles:

Cost.
Temperature range.
Weight.
Efficiency.
Complexity

Explicación

Pregunta 16 de 64

1

Redundancy in cabin pressurization outflow valves is requested:

Selecciona una o más de las siguientes respuestas posibles:

Sometimes.
Never.
Always.

Explicación

Pregunta 17 de 64

1

In a wing profile section, ice accretion impingement limits will be most extended in the following case:

Selecciona una o más de las siguientes respuestas posibles:

Thick profile, low speed, small droplets.
Thin profile, low speed, big droplets.
Thin profile, high speed, big droplets.

Explicación

Pregunta 18 de 64

1

A deicing system is basically sized to limit quantity of ice accreted. What is the worst flying condition in terms of design:

Selecciona una o más de las siguientes respuestas posibles:

Low speed, high Outside Ambient Temperature.
Low speed, low Outside Ambient Temperature
High speed, high Outside Ambient Temperature
High speed, low Outside Ambient Temperature

Explicación

Pregunta 19 de 64

1

Which are the aircraft key operational cases that are normally considered for the sizing of the APU on large civil aircrafts for passenger transport?

Selecciona una o más de las siguientes respuestas posibles:

Main Engine Start In Flight at 30 kFt.
On Ground Electrical power demands only.
On Ground Electrical & Pneumatic power demands from the A/C systems

Explicación

Pregunta 20 de 64

1

The APU model PW980 in the AIRBUS A380 is steadily supplying bleed air for the aircraft pneumatic systems (MES or ECS) on ground. In a matter of a couple of seconds, such demand is significantly reduced. What would be the expected immediate reaction from the APU control system?

Selecciona una o más de las siguientes respuestas posibles:

The ECB commands the Bleed Valve to close and the APU electrical generator to absorb more shaft power in order to avoid a Load Compressor over speed.
To command the opening of the Anti-surge Valve and the closure of the Inlet Guide Vanes, to alleviate the bleed pressure raise & reduce the bleed airflow supply.
The command to the aircraft’s fuel system to shut off completely the fuel supply to the APU and stop it to prevent the burst of the aircraft’s bleed piping.

Explicación

Pregunta 21 de 64

1

The APU model PW980 in the AIRBUS A380 is steadily supplying bleed air for the aircraft pneumatic systems (ECS) on ground. In a matter of a couple of seconds , such demand signal from the ECS is significantly reduced . Which of these cannot be a normal reaction of the APU Ctrl system under such situation:

Selecciona una o más de las siguientes respuestas posibles:

To keep fully open the Bleed Shut-off Valve while correspondingly closing the Load Compressor IGVs.
To automatically shut down the APU in case an oil system overtemperature is sensed by the APU ECB.
To correspondingly close the Load Compressor IGVs to reduce the bleed flow, while keeping constant the fuel flow to maintain a constant L/C speed.
To keep the Surge Valve fully closed while progressively reducing the fuel flow to avoid an APU rotors overspeed condition potentially leading to a rotor burst.

Explicación

Pregunta 22 de 64

1

For the start of the APU engine on large civil aircrafts for passenger transport, the most commonly used system consists on:  

Selecciona una o más de las siguientes respuestas posibles:

An electrical 12VDC Starter/Generator.
An electrical 28VDC Starter/Generator.
An electrical 28VDC Starter Motor.
An air turbine starter.

Explicación

Pregunta 23 de 64

1

Which of the following is not a true statement related to APU in-flight start reliability :

Selecciona una o más de las siguientes respuestas posibles:

The A350 flight test campaign (Honeywell HGT1700) is already showing in 2013, APU in- flight restart reliabilities of around 98%.
The A330 fleet (Honeywell 331-350 APU) has already shown APU in-flight restart reliabilities of 97%or higher.
The APU shall be operative without permanent presence of operator.
The APU in its installed configuration shall have an adequate in- flight start reliability (not less than 95%) throughout the flight envelope taking account of all approved fuel types and temperatures
The APU in its installed configuration shall have an adequate in- flight start reliability (not less than 83%) throughout the flight envelope taking account of all approved fuel types and temperatures
The APU shall be capable to pressurize the aircraft and maintain an adequate cockpit and cabin environment in one-engine inoperative cruise conditions, taking into account one engine operative requirements, up to 30,000 ft.
The A350 shall be capable to start any engines - regardless of engine starting sequence or engine type (RR or GE) - on ground using battery power supply.

Explicación

Pregunta 24 de 64

1

Which of the following statements is/are not correct? :

Selecciona una o más de las siguientes respuestas posibles:

Same as in a propulsive power plant, the APU shall be installed in a Fire Compartment.
The APU engine shall be mounted on the A/C structure with a Suspension System designed  to withstand the corresponding inertial loads.
The APU Air Intake usually has an electrically actuated flap door that is kept closed while the APU is not operating.
The Exhaust Muffler outlet at the very rear end point of the fuselage is the most favorable location for its pressure effect for in-flight APU starts
The Cooling Inlet function is to convey the necessary atmospheric air flow into the APU for both the : Power Unit and Load Compressor

Explicación

Pregunta 25 de 64

1

The installation of the APU in the fuselage tailcone section on large civil aircrafts for passenger transport, presents as a significant drawback:

Selecciona una o más de las siguientes respuestas posibles:

The impacts on the aircraft in case of rotor burst.
The noise projection on the ground.
The in-flight aerodynamic conditions.
The accessibility for ground maintenance operations

Explicación

Pregunta 26 de 64

1

The installation of the APU in the fuselage section 19.1 on AIRBUS’s large civil aircrafts for passenger transport, presents a main advantage (when compared to an APU installed in the wing root or main landing gear zones), that is:

Selecciona una o más de las siguientes respuestas posibles:

The length of fuel supply line, bleed air pipe & electrical cables lengths.
Maintenance tasks and APU replacement are easier.
The noise projection on the ground.

Explicación

Pregunta 27 de 64

1

Which one is not a key feature for the fire protection design strategy in an typical APS installation? :

Selecciona una o más de las siguientes respuestas posibles:

An adequate APU compartment drainage system.
A manual (non-automatic) APU fire detection & extinguishing system for APU ground use.
The use of fireproof titanium firewalls of 0.4 mm thickness.
The installation of the APU in a fire compartment with a fire detection & extinguishing system.

Explicación

Pregunta 28 de 64

1

Which are the key features for the fire protection design strategy in an typical APS installation?

Selecciona una o más de las siguientes respuestas posibles:

The fire detection & fire extinguishing systems only.
The installation of the APU in the fuselage tailcone area, and the limitation of the APU use  mostly for ground.
The fireproof design of the APU compartment & components, the ventilation, the drainage, and the fire detection & fire extinguishing systems.

Explicación

Pregunta 29 de 64

1

The primary step for the Certification of the APU system in the aircraft is:  

Selecciona una o más de las siguientes respuestas posibles:

To achieve the certification of the aircraft electrical & pneumatic systems to be supplied by the APU.
To achieve the APU Qualification obtained by the manufacturer for the engine by TSO C77B.
The Compatibility & the Flight Test campaigns.

Explicación

Pregunta 30 de 64

1

Which is the primary test platform for certification of the integrated A/C & APU system? :

Selecciona una o más de las siguientes respuestas posibles:

The APU engine test cells
The Flight Tests aircrafts
The Compatibility Tests rig.
The Icing Tests rig

Explicación

Pregunta 31 de 64

1

The normal duration of the development cycle for a new APU system in a large transport aircraft is:  

Selecciona una o más de las siguientes respuestas posibles:

The duration of the typical A/C’s: Electrical duty cycle + ECS duty cycle – the MES time
Minimum 10 years
6 to 7 years

Explicación

Pregunta 32 de 64

1

Which are the aircraft key operational cases that are normally considered for the sizing of the APU on large civil aircrafts for passenger transport? :

Selecciona una o más de las siguientes respuestas posibles:

On Ground Electrical & Pneumatic power demands from the A/C systems  
In-Flight Electrical power demands
Main engine start in flight at 22Kft

Explicación

Pregunta 33 de 64

1

The APU is steadily operating on Max ECS supply condition on ground. Due to an incorrect tightening of the clamp that couples the APU Bleed Valve and the ATA36 pneumatic duct, an air leak takes place in fuselage section 19.1. Which of these statements is correct at that instant? :

Selecciona una o más de las siguientes respuestas posibles:

The Surge Control Valve ( SCV ) will be commanded to ‘close’ since the L/C operating condition reaches the cracking line.  
The L/C IGVs control logic will command the closing of the SCV to further increase the flow towards the ECS.
The APU lubrication system heat exchanger will remain air cooled by airflow pumped by the APU exhaust eductor or a gearbox driven fan.
The APU Inlet door position regulated by the ECB will be further opened to increase the airflow through the APU Load Compressor.
The surge control logic will command the closing of the SCV to further increase the flow towards the ECS.

Explicación

Pregunta 34 de 64

1

Which of the following functions correspond to the FCS?

Selecciona una o más de las siguientes respuestas posibles:

Stability augmentation
Thrust setting
Positions aerodynamic control surfaces according to pilot, autopilot or stability augmentation inputs
Provides the pilot with the required force feedback
Flight Envelope Protection
Load alleviation (manoeuvre and gust).
Flutter suppression.
Thrust vectoring.
Abnormal position recovery, including post stall

Explicación

Pregunta 35 de 64

1

Two of the following statements are correct. Which ones are they?

Selecciona una o más de las siguientes respuestas posibles:

Artificial feel systems are required to provide good handling qualities in irreversible FCS systems
In an “irreversible” FCS, pilot cannot reconfigure the system after a failure.
In an irreversible FCS aerodynamic loads are not fed back to the pilot inceptor

Explicación

Pregunta 36 de 64

1

Identify two drawbacks of the Fly By Wire systems in the list below.

Selecciona una o más de las siguientes respuestas posibles:

They require the use of hydraulic systems to provide power to the actuators.
They require a high degree of redundancy.
High development cost and high system clearance effort.
SW development complexity and inherent computing delays.
Safety critical SW certified against Common Mode Failures (testing +
specification).
EMI susceptibility
Evolving regulation.

Explicación

Pregunta 37 de 64

1

Which of the following statements are true for all types of Fly By Wire FCS:

Selecciona una o más de las siguientes respuestas posibles:

A mechanical back-up system is required to control the aircraft after a total FBW system failure.
Configuration changes are easy to implement in comparison with mechanically signaled FCS.
May be Active control technology (ACT) or Control configured vehicle (CCV)
Direct mechanical link are replaced by an electrical signalling system
Pilot control aircraft dynamics parameters instead of aircraft surface position 
Improve aircraft natural dynamic behaviour 
Cockpit layout design flexibility 
Reduced maintenance and operational cost 
Reduced weight, increased reliability

Explicación

Pregunta 38 de 64

1

Which of the following statements do not apply to the concept of Control Configured Vehicles:  

Selecciona una o más de las siguientes respuestas posibles:

Requires a careful balance between stick force and control authority at low and high speed.
Provides automatic prevention of stall departure and spinning.
Concurrent and complementary design of the basic airframe together with FCS to achieve performance improvements.
Allows improved aircraft performance and manoeuvrability.
Automatic structural protection and gust alleviation enhancing safety and reduce pilot’s workload.
Require full authority FCS with aircraft response feedback.
Use of the FCS to actively compensate for deficiencies in the aerodynamics of the basic airframe.

Explicación

Pregunta 39 de 64

1

What is the main disadvantage of the Electro Mechanical Actuator for its application in Primary FCS?

Selecciona una o más de las siguientes respuestas posibles:

If there is a mechanical jamming, control surface remains in the last commanded position.
The mechanical signaling circuit is prone to jamming.

Explicación

Pregunta 40 de 64

1

Identify two inputs to the FCS design from the following list:

Selecciona una o más de las siguientes respuestas posibles:

Interface Documents.
Compliance Check List.
Maintenance concept
Technical Direction (Compatibility with A/C Concept and other systems and Target Cost)
Preliminary Design (Control Surface Definition, Space Envelope, Target Weight)
Flight Physics (Functional def., Suf. deflexion, Actuation rate, Trim charact./artificial feel, Failures criticality)
Loads (Hinge moment and Surface deflexion limits)
Regulation (Certification basis and Safety criteria)
Reliability (Failure rate target)
Maintenance (Maintenance Concept and Failure detection level)

Explicación

Pregunta 41 de 64

1

Identify why kerosene type fuels (Jet A-1/JP-8) are safer than wide-cut fuel types (JetA/JP-4) (choose one):

Selecciona una o más de las siguientes respuestas posibles:

Kerosene Type Fuels have higher freezing temperature.
Density of Kerosene Type Fuels is higher.
Kerosene Type Fuels is less flammable than Wide-Cut Fuel Types
Kerosene Type Fuels have lower volatility / Vapor Pressure than Wide- Cut Fuel Types.

Explicación

Pregunta 42 de 64

1

Identify what is the purpose of the fuel vent subsystem (choose two):

Selecciona una o más de las siguientes respuestas posibles:

Allow fuel thermal expansion inside the tanks without external leakage.
Maintain the fuel tank temperature.
Avoid fuel tank overpressure or under-pressure during climbs and dives.

Explicación

Pregunta 43 de 64

1

For certification of the fuel system is essential to demonstrate that (choose one):

Selecciona una o más de las siguientes respuestas posibles:

The fuel reserves are higher than 5% of the fuel tank contents.
The aircraft can be refueled in flight.
The fuel supply of the engines is maintained across all the flight envelope

Explicación

Pregunta 44 de 64

1

What are the advantages of the Boom/Receptacle Air Refuelling Systems compared with probe and drogue Air Refueling System systems (choose two):

Selecciona una o más de las siguientes respuestas posibles:

It allows simultaneous air refuelling of two receiver aircraft.
Reduces the receiver pilot work load when in contact.
None, they are fully compatible between them.
Allows reverse refuelling  .
Possibility to refuel aircrafts with probe.
Higher flow rates and then less time to complete   refueling.
A tanker with flying boom can be adapted with a probe-adapter

Explicación

Pregunta 45 de 64

1

What are the advantages of the Probe and Drogue Air Refuelling Systems compared with Boom/Receptacle Air Refueling System systems (choose three):

Selecciona una o más de las siguientes respuestas posibles:

It would allow simultaneous air refuelling of two receiver aircraft.
Normally minimizes the modification of the aircraft and fuel system due to the Air Refueling  Installation
None, they are fully compatible between them.
Simpler and cheaper design.
Allows A/Cs not originally designed as tanker to be converted.
Allows higher fuel transfer flow rates minimizing the time in contact.
No BOOM operator is needed.
Can be used to refuel helicopters.

Explicación

Pregunta 46 de 64

1

In terms of safety, which is the main concern in air refuelling operations?

Selecciona una o más de las siguientes respuestas posibles:

Transferring fuel is always the big safety concern.
Lack of fuel transfer in flight will not allow the receiver to make a safe landing.
AAR operations requires two aircraft flying in close formation.
In addition to the danger of flying in close formation, there are risks associated with the dispense devices.
Coupling detached & Uncontrolled hose movement.
Requires two aircraft flying in close formation
Several aircraft are flying in close proximity, increasing the pilot workload and hence the risk of collision.
In addition to the danger of flying in close formation, there are risks associated with the dispense devices.

Explicación

Pregunta 47 de 64

1

The purpose of fire detection systems is:

Selecciona una o más de las siguientes respuestas posibles:

To eliminate the possibility of a fire in the aircraft
To sense and indicate the presence of overheat, smoke or fire
To signal presence and locate fire in the aircraft
To extinguish the fire in the aircraft.

Explicación

Pregunta 48 de 64

1

Why current fire extinguishing substances (Halon based) have to be replaced in the future? (choose one)

Selecciona una o más de las siguientes respuestas posibles:

They are considered risk substances for human health.
Density of halon is too high compared with new substances considered equivalent for fire  extinguishing.
When used, or escape to the atmosphere, they are substances that contribute to destroy the ozone layer of the upper atmosphere.
The Montreal Protocol of 1987 identified Halon 1301 and Halon 1211 as two of a number of halogenated agents requiring limitations of use and production.

Explicación

Pregunta 49 de 64

1

What is the purpose of the self sealing fuel tanks? (choose one)

Selecciona una o más de las siguientes respuestas posibles:

The avoid fuel tank explosion sealing the tank after projectile impact.
They reduce the risk of fire in hot areas around the fuel tanks by minimizing fuel leakage in case of a thread impact
To conserve inerting performances by keeping the tank sealed.

Explicación

Pregunta 50 de 64

1

What are the two main factors to be considered in the selection of foams?

Selecciona una o más de las siguientes respuestas posibles:

Colour.
Resistance to fuel exposure.
Conductivity

Explicación

Pregunta 51 de 64

1

What are the differences today between OBIGGS for civil airliners and OBIGGS for military airplane (choose two)

Selecciona una o más de las siguientes respuestas posibles:

Civil ones are more demanding than military one.  
There is not any difference.
Military: The objective is to reduce vulnerability and enhance the ability to survive enemy fire into a possibly explosive fuel tank.
Civil: Active protection on center wing or body style tanks reasons of being unused by operators and are prone to be heated due to the usual closeness of heat sources like the air conditioning packs.
The purpose of civil ones is to minimize the risk of tank explosion in case of fuel system failures and military ones is to minimize the risk of tank explosion in case of external military threats.
For military application Limiting Oxygen Concentration LOC =9% and civil LOC=12%.

Explicación

Pregunta 52 de 64

1

Ground testing allows:

Selecciona una o más de las siguientes respuestas posibles:

Test individual elements .
Test all aspects of the complete a/c and of the man/machine interface.
Modeling, simulation, individual elements or the complete a/c are tested as far as possible to find design deviations as soon as possible.

Explicación

Pregunta 53 de 64

1

Identify what tests are performed during pre-flight test phase:

Selecciona una o más de las siguientes respuestas posibles:

Structural loads tests .
Functional tests
Taxi tests.
Wind Tunnel tests
Simulation tests.
Ground vibration tests.
Gain margin tests.
Weight & Balance.
Propulsion tests.

Explicación

Pregunta 54 de 64

1

The Nose Wheel arrangement of an airplane is shown in attached figure:

Selecciona una o más de las siguientes respuestas posibles:

Statically neutral, Dynamically neutral suitable only for steered mounting and shimmy damper required.
Statically neutral, Dynamically stable, Stable in reverse when wheel casters right around, Normally Shimmy damper required unless twin wheels coupled in rotation used.
Statically unstable. Dynamically Stable. Unstable in reverse. Must be locked or steered.

Explicación

Pregunta 55 de 64

1

Brake by wire system control typically has critical partitions as:

Selecciona una o más de las siguientes respuestas posibles:

Brake by wire systems do not use brake order computer control. The command is mechanically transmitted by to the Brake Valve. Only Antiskid computer is used to carry on antiskid function.
Beside non-commanded brake order generated from computer caused by SW error or HW failure at take-off, brake availability at landing could also be critical. A back up brake control (emergency system) torque limited (without antiskid protection) is normally needed.

Explicación

Pregunta 56 de 64

1

For aircraft designs required to operate in unpaved airfields:

Selecciona una o más de las siguientes respuestas posibles:

Radial tyres are normally used because they are lighter than Bias Tyres.
Bias tyres are normally used because sidewall thickness and better retreadability. Sidewall thickness contributes to minimize punches when operating underinflated when sidewall is  more exposed to ground contamination

Explicación

Pregunta 57 de 64

1

Which are the key features of the Solid State Power Controller?

Selecciona una o más de las siguientes respuestas posibles:

Electronic component based on power semiconductors  
Mechanical trip device activated by the heating
Protects   installations from short circuits and overloads.
Remote control/monitor capability
High Mean Time Between Failure-MTBF.
Is a wiring protection device as circuit breaker (CB), Arc Fault Circuit Breakers (AFCB), Remote Controlled Circuit Breakers (RCCB).

Explicación

Pregunta 58 de 64

1

The purpose of electrical distribution systems is:  

Selecciona una o más de las siguientes respuestas posibles:

Ensure a maximum availability of the bus-bars.
Mechanical disconnection (mechanically disconnect it from the engine).
Participate in the connection/disconnection of the power sources.
Ensure the electrical network reconfigurations.
Ensure the protection against short circuit, over voltage, …
Ensure the electrical protections in order to avoid power source paralleling (AC) and propagation of defaults.

Explicación

Pregunta 59 de 64

1

Identify two drawbacks of the conventional protection devices (fuse and Circuit breakers):

Selecciona una o más de las siguientes respuestas posibles:

They require a high volume.
They are general use devices.
Influenced by ambient temperature.
No monitor capability.
Complex to monitor.
Slow response.
No reset capability.
No arc-fault detection capability.

Explicación

Pregunta 60 de 64

1

What type of main generator disconnection could perform crew with cockpit push-buttons?

Selecciona una o más de las siguientes respuestas posibles:

Electrical disconnection (line contactor opening).
Mechanical disconnection ( generator mechanically disconnected from the engine).

Explicación

Pregunta 61 de 64

1

Regulated converters advantages compared with unregulated converters are:

Selecciona una o más de las siguientes respuestas posibles:

Higher efficiency
Output voltage regulation (thinner range).
No power source rating imposed limit.
Lower ripple.

Explicación

Pregunta 62 de 64

1

Why large aircrafts generally use Hydraulic Powered Actuation Systems?

Selecciona una o más de las siguientes respuestas posibles:

High hydro-mechanical stiffness and associated high frequency response is relevant for flight control actuation. Additional typical factors are good response time, efficiency, reliability and robustness of hydro-mechanical systems when compared with another systems.
High hydro-mechanical stiffness and associated high frequency response is relevant for flight control actuation. Additional typical factors are response time and efficiency but not reliability and robustness, when compared with another Systems
High Power Transmission vs. System Weight.
High Efficiency.
Robustness & Reliable.
Shared Power Generation System.

Explicación

Pregunta 63 de 64

1

Generally, with regards to the number of hydraulic systems used in a civil typecertified large aircraft under Part 25 – EASA Airworthiness Regulations:

Selecciona una o más de las siguientes respuestas posibles:

The use of EHAs or EMAs for PFC may allow using only two hydraulic systems. This is dependent on having sufficient redundancy within the electrical power generation system.
If there are a large number of services that are powered hydraulically, four independent hydraulic systems may be a design solution in order to reduce the size of pumps.
There is no any aircraft using two hydraulic systems. If any primary flight control is required to be hydraulically powered, definitively three hydraulic systems are required.
Large aircrafts with two engines and three hydraulic systems normally requires a PTU (Power Transfer Unit) to transfer hydraulic power between the hydraulic systems in determined failure cases or for ground taxing with one engine shut down.

Explicación

Pregunta 64 de 64

1

Indicate which of the following statement(s) regarding the FCS is (are) correct:

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In a “direct link” FCS, there is a linear relation between control surface displacement and stick forces.
In a “fly by wire” FCS, pilot controls parameters rather than surface position.
Artificial feel systems are required to provide good handling qualities in irreversible FCS systems
In an “irreversible” FCS, pilot cannot reconfigure the system after a failure.

	Creado por Miguel Angel Veg1927 hace más de 8 años

Masters MASI Test sobre General Systems (GS), creado por Miguel Angel Veg1927 el 10/06/2016.

General Systems (GS)

Pregunta 1 de 64

Select the correct response(s):

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Explicación

Pregunta 2 de 64

If the aircraft hydraulic system supply the services that control the direction of the aircraft on the ground (e.g. nosewheel steering and differential braking):

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Explicación

Pregunta 3 de 64

Common use Aerospace Hydraulic Pumps:

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Explicación

Pregunta 4 de 64

Common use Hydraulic Reservoirs :

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Explicación

Pregunta 5 de 64

CFG main advantages compared with VFG are:

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Explicación

Pregunta 6 de 64

The emergency system shall power the services necessary to complete a flight and make a safe landing. The services to be powered must include:

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Explicación

Pregunta 7 de 64

New high voltage levels (270 Vdc and 230 Vac) are applicable to civil and military electrical systems since they permit to:

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Explicación

Pregunta 8 de 64

Electrical power quality is determined by:

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Explicación

Pregunta 9 de 64

Li-Ion battery technology main advantages compared with Ni-Cd one are:

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Explicación

Pregunta 10 de 64

LED technology main advantages compared with HID one are:

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Explicación

Pregunta 11 de 64

What of the following exterior lights have their illumination performances covered by the EASA Part 25 requirements?

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Explicación

Pregunta 12 de 64

The biggest problem in humans associated to exposure at high altitudes is:

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Explicación

Pregunta 13 de 64

Aerodynamic heating is given, basically, by the total temperature of the air computed as follows Ttot = Tambient (1+ 0.2 Mach2). Given an ISA atmosphere, the heating is maximum in one of the following conditions:

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Explicación

Pregunta 14 de 64

Minimum standard ventilation to maintain CO2 levels in enclosed spaces is (at SL, 15ºC) according to ASHRAE:

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Explicación

Pregunta 15 de 64

Being one of the most efficient cooling systems, why liquid cooling is not so used:

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Explicación

Pregunta 16 de 64

Redundancy in cabin pressurization outflow valves is requested:

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Explicación

Pregunta 17 de 64

In a wing profile section, ice accretion impingement limits will be most extended in the following case:

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Explicación

Pregunta 18 de 64

A deicing system is basically sized to limit quantity of ice accreted. What is the worst flying condition in terms of design:

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Explicación

Pregunta 19 de 64

Which are the aircraft key operational cases that are normally considered for the sizing of the APU on large civil aircrafts for passenger transport?

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Explicación

Pregunta 20 de 64

The APU model PW980 in the AIRBUS A380 is steadily supplying bleed air for the aircraft pneumatic systems (MES or ECS) on ground. In a matter of a couple of seconds, such demand is significantly reduced. What would be the expected immediate reaction from the APU control system?

If the aircraft hydraulic system supply the services that control the direction of the aircraft on the ground (e.g. nosewheel steering and differential braking):  

What of the following exterior lights have their illumination performances covered by the EASA Part 25 requirements?  

For the start of the APU engine on large civil aircrafts for passenger transport, the most commonly used system consists on:  

The primary step for the Certification of the APU system in the aircraft is:  

The normal duration of the development cycle for a new APU system in a large transport aircraft is:  