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Test sobre Examen Dani, creado por Pablo_masi el 22/06/2016.

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Examen Dani

Pregunta 1 de 57

1

We have detected the following malfunction:
Each time we are transmitting with the radio in a channel centered in 409 MHz, we find problems with the GPS. We have reduced the output power of the radio, and the problem disappears. We do not have problems between the radio and the GPS in other channels, separated 50 MHz between them. The GPS is using L2 band (1227.60 MHz). The length of the GPS cable is 10 meters and the gain of the preamplifier of the GPS antenna is 20 dB. The cable insertion loss is 0.5 dB per meter.
 Which proposals can solve this problem?

Selecciona una o más de las siguientes respuestas posibles:

  • We propose to change the GPS antenna for another with a better filter

  • We propose to reduce the spurious emission of the radio

  • We propose to increase the gain of preamplifier of the GPS antenna

  • We propose to relocate the antennas to increase the isolation.

Explicación

Pregunta 2 de 57

1

Concerning the directive/directional antennas, which one(s) are true:

Selecciona una o más de las siguientes respuestas posibles:

  • With an array antenna we could electronically locate the maximum of the radiation pattern track a target and electronically locate a null of the radiation pattern to avoid jamming.

  • The main advantage of an electronically scan array antenna compared to a mechanical scan reflector antenna is the simplicity of electronically steering of the radiation pattern, which enables to design a simpler antenna avoiding the integration of motors, gears, encoders…

  • We have designed and integrated a satcom system working in X band based on a reflector+subreflector antenna. We have to move to Ku band. In general, we cannot reuse the radome.

  • We have designed and integrated a satcom system working in X band based on a reflector+subreflector antenna. We have to move to Ku band. In general, we cannot reuse the main reflector and subreflector of the antenna

Explicación

Pregunta 3 de 57

1

Concerning the impedance of an antenna, which ones are true:

Selecciona una o más de las siguientes respuestas posibles:

  • There is a relation between the impedance of the antenna and efficiency factor.

  • This parameter only depends on and is fixed by the matching network

  • If we know the impedance of an antenna we can evaluate the efficiency factor.

  • It can be measured, even installed on the aircraft, and could be used to check the right impedance of the antenna.

Explicación

Pregunta 4 de 57

1

In the task of antenna location, which one(s) is(are) true:

Selecciona una o más de las siguientes respuestas posibles:

  • The efficiency radiation of the antenna must be optimised, in the general case, by choosing the best location for the installation of the antenna.

  • The performance of the antenna installed on the aircraft is assessed, typically using electromagnetic simulation, to estimate the radiation patterns (coverage) of the antenna installed in a predefined location.

  • The performance of the antenna installed on the aircraft is assessed, typically using electromagnetic simulation, to estimate the impedance and the radiation patterns (coverage) antenna installed in a predefined location.

  • The efficiency of the antenna is not a parameter fixed during this phase. The efficiency antenna is selected/defined during the selection of the antenna phase, and assured by definition of the installation requirements.

Explicación

Pregunta 5 de 57

1

Common use Hydraulic Reservoirs

Selecciona una o más de las siguientes respuestas posibles:

  • All are pressurized (bootstrap) type.

  • Generally are bootstrap type and air pressurized, but not limited to.

  • Do not need pressurization. Vented type reservoir is sufficient whenever located above the pum

Explicación

Pregunta 6 de 57

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:

  • Reduce electrical power demand

  • Reduce current level.

  • Increase hydraulic Systems.

Explicación

Pregunta 7 de 57

1

Electrical power quality is determined by:

Selecciona una o más de las siguientes respuestas posibles:

  • The electrical power generation equipments.

  • The electrical consumers.

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

Explicación

Pregunta 8 de 57

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

  • Anticollision lights.

  • Taxi lights.

Explicación

Pregunta 9 de 57

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:

  • Weight

  • Cost

  • Reliability

Explicación

Pregunta 10 de 57

1

Redundancy in cabin pressurization outflow valves is requested: 


Selecciona una o más de las siguientes respuestas posibles:

  • Sometimes

  • Never

  • Always

Explicación

Pregunta 11 de 57

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:

  • High speed, high Outside Ambient Temperature

  • Low speed, low Outside Ambient Temperature

  • Low speed, high Outside Ambient Temperature

Explicación

Pregunta 12 de 57

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 Motor

  • An air turbine starter.

Explicación

Pregunta 13 de 57

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 Compatibility Tests rig.

  • The Icing Tests rig 


  • The Flight Tests aircrafts

Explicación

Pregunta 14 de 57

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 15 de 57

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 the use of digital computers.

  • They require a high degree of redundancy.

  • High development cost and high system clearance effort.

Explicación

Pregunta 16 de 57

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:

  • Force feedback depends on thrust and flap setting.

  • Aircraft response is tailored by the Flight Control Computers based on flight phase and system availability

  • 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.

Explicación

Pregunta 17 de 57

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:

  • They require local hydraulic pumps that make the design heavy and complex.

  • They have a slow response to input commands

  • If there is a mechanical jamming, control surface remains in the last commanded position.

  • The mechanical signaling circuit is prone to jamming

Explicación

Pregunta 18 de 57

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • They reduce the risk of fire in hot areas around the fuel tanks by minimizing fuel leakage in case of a thread impact.

  • They avoid projectile penetration.

  • The avoid fuel tank explosion sealing the tank after projectile impact.

Explicación

Pregunta 19 de 57

1

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

Selecciona una o más de las siguientes respuestas posibles:

  • Density

  • Conductivity

  • Color

  • Resistance to fuel exposure

Explicación

Pregunta 20 de 57

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

  • Remote control/monitor capability

  • Mechanical trip device activated by the heating

Explicación

Pregunta 21 de 57

1

Why large aircrafts generally use Hydraulic Powered Actuation Systems? (MASI12)

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.

  • Stiffness and response time are equivalent to electrically powered actuators, as EHAs, that intrinsically does not use hydraulics but purely consist in an electrical actuators, and are .. used in latest aircaft developments aircraft. Additional factors are response time, efficiencym reliability and robustness of hydro-mechanical systems when compared with another systems

Explicación

Pregunta 22 de 57

1

GPS accurate depends on:

Selecciona una o más de las siguientes respuestas posibles:

  • The last time from initial position.

  • The integration with the Inertial Navigation System

  • The air temperature

  • The number of satellites in view and the proper geometry.

Explicación

Pregunta 23 de 57

1

The TACAN system is a military radio navigation aid that:

Selecciona una o más de las siguientes respuestas posibles:

  • is able to provide absolute bearing and slant range to the ground station.

  • Provides geographical coordinates based on the integration of measured accelerations.

  • Provides a range function fully compatible with the one provided by DME.

  • Provides a bearing function based in the difference in phase of two pair of reference and 
variable phase signals. One of 15 Hz and another of 135 Hz.

Explicación

Pregunta 24 de 57

1

Flight Management System computes aircraft position based on

Selecciona una o más de las siguientes respuestas posibles:

  • Their own integrated pòsition sensors.

  • The pilot manual inputs.

  • Available aircraft navigation sensors with priority on their accuracy.

  • GPS only.

Explicación

Pregunta 25 de 57

1

VOR receiver cockpit incorporates the following function

Selecciona una o más de las siguientes respuestas posibles:

  • Course Deviation Indicator (CDI), which is a horizontal needle that moves laterally along a row of dots, each dot representing two degrees.

  • Omni Bearing Selector (OBS) which appears as a rotating latitude dial which provides for bearing selection.

  • Omni Bearing Selector (OBS) which appears as a rotating azimuth dial which provides for bearing selection

  • TO/FROM Indicator informs whether the aircraft bearing is “to” or “from” the VOR.

Explicación

Pregunta 26 de 57

1

Low and High RNAV routes are identified into the Aeronautical Chart by the letter:

Selecciona una o más de las siguientes respuestas posibles:

  • “L” and “H” respectively.

  • “T” and “Q” respectively.

  • “V” and “J” respectively

  • “RNAV T” and “RNAV Q” respectively.

Explicación

Pregunta 27 de 57

1

The three components of PBN concepts are

Selecciona una o más de las siguientes respuestas posibles:

  • Navigation application, Navigation Specification and Navigation Monitoring and Alerting

  • Navigation application, Navigation Specification and Navigation Infrastructure

  • Navigation Specification, Airspace Definition and System Performances.

  • Navigation application, Navigation Specification and Global Navigation Constellation.

Explicación

Pregunta 28 de 57

1

Which of the following guidance systems are used in air to air missiles?

Selecciona una o más de las siguientes respuestas posibles:

  • IR passive sensor.

  • UV passive senso

  • Active radar guidance.

  • Laser/GPS guidance.

Explicación

Pregunta 29 de 57

1

Which sentence better suits the definition of Jettison?

Selecciona una o más de las siguientes respuestas posibles:

  • Uncommanded release of not armed weapons

  • Uncommanded release of armed weapons

  • Commanded release of armed weapons.

  • Commanded release of not armed weapons.

Explicación

Pregunta 30 de 57

1

What is a DIRCM?

Selecciona una o más de las siguientes respuestas posibles:

  • Metal-coated dielectric fibers that, when dispensed in large numbers, can produce strong radar echoes.

  • A flare that burns with an IR wavelength similar to the target aircraft IR signature.

  • Infrared countermeasure system that tracks and directs energy towards the threat.

  • A decoy attached to a thin cable, which can gradually be reeled out behind the aircraft, to confuse an enemy and draw his radar, or the seeker of an approaching radar guided missile.

Explicación

Pregunta 31 de 57

1

Which of the following characteristics are true for IR Missile Approach Warning?

Selecciona una o más de las siguientes respuestas posibles:

  • It is a passive sensor.

  • It detects the IR emission from the missile body and plume.

  • Farther detection range than UV Missile Approach Warning.

  • Only one sensor provides full coverage.

Explicación

Pregunta 32 de 57

1

When the IR seekers of a modern short range missile acquire the target IR emissions…

Selecciona una o más de las siguientes respuestas posibles:

  • There are no short range missiles with IR seeker

  • Can detect the IR emissions before or after it is fired

  • Always detects the IR emissions before it is fired.

  • Always detects the IR emissions after it is fired.

Explicación

Pregunta 33 de 57

1

Which of the following list of elements completely define a UAS? :

Selecciona una o más de las siguientes respuestas posibles:

  • Air Vehicle and Ground Segment.

  • UAV + GCS.

  • AV + COMMs + AMS + GCS

  • None of them.

Explicación

Pregunta 34 de 57

1

The payload capacity of a UAS is based on the available:

Selecciona una o más de las siguientes respuestas posibles:

  • Weight, volume and power on the AV.

  • Number of different payloads that can be integrated.

  • Its growth potential (HW & SW) to manage multi-payloads

  • Volume, weight and power both on ground and onboard

Explicación

Pregunta 35 de 57

1

3. Military RPAs traffic which does not comply with ICAO rules and procedures is termed (choose one):

Selecciona una o más de las siguientes respuestas posibles:

  • Operational Air Traffic

  • Governmental Air Traffic

  • General Air Traffic.

  • State aircrafts.

Explicación

Pregunta 36 de 57

1

Which category of ground segment architecture implicity requests handover capability?

Selecciona una o más de las siguientes respuestas posibles:

  • Portable

  • Distributed

  • Deployable

  • None of them.

Explicación

Pregunta 37 de 57

1

From the point of view of technology development in UAS, what are considered the main challenge UAS integration:

Selecciona una o más de las siguientes respuestas posibles:

  • Navigation and ATC communication

  • Regulation and social acceptance.

  • Data Links reliability and Sense and Avoid capability

  • Data Links and Navigation.

Explicación

Pregunta 38 de 57

1

In the Continuous Wave radar transmission method, which of the following target information is/are provided by the Doppler effect?

Selecciona una o más de las siguientes respuestas posibles:

  • Speed of the target

  • Presence of the target

  • Relative bearing of the target

Explicación

Pregunta 39 de 57

1

Frequency-modulated radars transmit a wave that continuously changes in frequency about a center frequency. Using frequency modulation, the range to a target is determined by using which of the following methods?

Selecciona una o más de las siguientes respuestas posibles:

  • By comparing the frequency of the transmitted signal with the returned frequency from the target

  • By comparing the magnitude of the transmitted pulses with the magnitude of returned pulses

  • By comparing the velocity of the received energy with the velocity of the transmitted energy

  • By measuring the doppler shift that occurs in the returning signal

Explicación

Pregunta 40 de 57

1

Which of the following flight conditions are optimal for SAR image generation?

Selecciona una o más de las siguientes respuestas posibles:

  • Straight and level flight, high constant speed, direct to target.

  • Straight flight, low speed, direct to target.

  • Straight and level flight, high constant speed, target approximately at 90º (270º) bearing from ground track (own aircraft course).

  • Orbit (circular) flight path centered in the target, maximum roll of 5º.

Explicación

Pregunta 41 de 57

1

Select the correct answer(s): the waveguide runs…

Selecciona una o más de las siguientes respuestas posibles:

  • should be always pressurized using dedicated compressors

  • must have a minimum air density, to avoid arcing effects during radar transmission.

  • admit structural stress, so they can be used to support other structures in the airframe

  • should be designed to minimize the number of joints, bends and turns, to reduce insertion loss.

Explicación

Pregunta 42 de 57

1

The TAWS mode 7 provides:

Selecciona una o más de las siguientes respuestas posibles:

  • Protection against descent below minimum height.

  • Windshear caution and warning.

  • Protection against altitude lost after take-off.

  • Landing gear up advisory.

Explicación

Pregunta 43 de 57

1

Enhanced GPWS modes are based on:

Selecciona una o más de las siguientes respuestas posibles:

  • The use of aircraft inertial navigation system

  • The use of aircraft roll altitude signal.

  • The use of terrain elevation databases.

  • The use of embedded GPS receivers

Explicación

Pregunta 44 de 57

1

Pulsed doppler radar

Selecciona una o más de las siguientes respuestas posibles:

  • he radial speed measurement is ambiguous

  • the range measurement is ambiguous

  • monopulse techniques can not be applied

  • a coherent transmitter is required

Explicación

Pregunta 45 de 57

1

Select from the following set of sentences concerning the Auxiliary Systems, the sentence(s) you believe are true:

Selecciona una o más de las siguientes respuestas posibles:

  • The CVR installation includes an automatic means to stop the recorder and prevent the erasure feature from functioning within 10 minutes after crash impact.

  • The CVR records a time reference for synchronization with the FDR data. 


  • The ELT cannot be manually activated by the pilots.

  • The Passenger Address transmission can be activated only through the Audio Management System

Explicación

Pregunta 46 de 57

1

Select, from the following set of sentences concerning COMSEC/TRANSEC, the sentence(s) that you believe are true

Selecciona una o más de las siguientes respuestas posibles:

  • Aircraft wirings carrying back signals should always be electromagnetically protected to avoid its “contamination” with red signals.

  • The integrity of messages is best protected when using analogic transmission techniques

  • Protected radio modes always rely on the availability of precise time data from a GPS receiver.

  • COMSEC keys cannot be edited in flight by the Pilot Non-Flying

  • Communication in the civil ATC band (118-137 MHz) provides secure authentication of the calling party.

Explicación

Pregunta 47 de 57

1

Assume you receive a requirement from the French Air Force to install a protected communication system operating in the UHF band. Select those response(s) which fulfill that requirement:

Selecciona una o más de las siguientes respuestas posibles:

  • One V/UHF transponder qualified for SINCGARS operation and one antenna.

  • One V/UHF radio fitted with embedded COMSEC, plus one control unit and one tuneable antenna.

  • One V/UHF radio qualified for HAVE QUICK

  • One V/UHF transponder qualified for PR4G standard with embedded COMSEC device

  • One V/UHF radio and an external SELCAL cryptographic device

Explicación

Pregunta 48 de 57

1

Select, from the following set of sentence concerning the Aeronautical Telecommunication Network (ATN), the sentence(s) you believe are true

Selecciona una o más de las siguientes respuestas posibles:

  • Subnetworks are, along with Intermediate Systems (IS) (or ATN routers) and End Systems (ES), one of the parts of the ATN modl, and have to be designed according to the protocol layers of the ATN model.

  • ATN is only defined for OSI (Open System Interconnection) reference model.

  • The ATN/OSI model became the standard solution because this solution was highly supported by the industry.

  • Context Management (CM), Flight Information Services (FIS) and Controller Pilot Data Link Communications (CPDLC) are three examples of ATN applications.

Explicación

Pregunta 49 de 57

1

Select, from the following set of sentences concerning the Satellite Communications Systems (SATCOM), the sentence(s) you believe are true

Selecciona una o más de las siguientes respuestas posibles:

  • Provision of broadband high speed data solutions (as the ones available in business jets to provide internet connections, VPN, etc.) in SATCOM systems is typically supported by means of communications in the L-band.

  • n military SATCOM systems, airborne terminals usually follow an standardization process before integration
.

  • In current civil SATCOM systems, terminals and antennas are not standardized, and each service provider has its own terminals, which has been identified as a potential problem for interoperability in the development of future communication services.

  • Current satellite communication systems provide enough communication capacity to the operational concept defined in the context of the Future Communication Infrastructure (FCI), as proved by different studies performed by EUROCONTROL and FAA in the joint Action Plan 17 (AP17), and therefore development of new services is not a priority in the medium term.

Explicación

Pregunta 50 de 57

1

From the following set of sentences concerning the future communication infrastructure that at this moment is under development (SESAR programme, European ATM Masterplan / NextGen – FAA), the sentence(s) you believe are true

Selecciona una o más de las siguientes respuestas posibles:

  • Communications systems for airport surface (AeroMACS) is bases on optical fiber connections because of the high bandwidth that this kind of connections is able to provide.

  • Use of software defined radio along with multiband antennas has being proposed as an alternative to provide a flexible airborne architecture.

  • Satellite communication systems (SATCOM) for ATS services will be progressively replaced by the most reliable new terrestrial datalinks and finally will be disabled in 2020 when these terrestrial datalinks will be fully operative.

  • Air forces of all countries in the European Union signed a cooperative agreement in March 2012 to use for ATC communications the Shared ATC System (SAS) with the virtual military ATC center created in the Maastrich Up

Explicación

Pregunta 51 de 57

1

Select, from the following set of sentences, concerning the High Frequency (HF)communication system, the sentence(s) that you believe are true:

Selecciona una o más de las siguientes respuestas posibles:

  • The range for HF communications is mainly due to the low attenuation of the ground wave at these frequencies. 



  • The range for HF communications is mainly due to the ability of radio signals at these frequencies of having reflections at the ionized levels of the atmosphere.

  • Lowest usable frequency (LUF) is higher at night.

  • Maximum usable frequency (MUF) is highly dependent on the cycle of solar activity.

Explicación

Pregunta 52 de 57

1

The Design Eye Position (DEP):

Selecciona una o más de las siguientes respuestas posibles:

  • Is taken into account in the Flight Deck design process and is adjusted for different anthropometric population

  • Is a point fixed in relation to the airplane structure at which the pilot’s eyes should be located when seated at the normal position

  • Is taken into account in the Flight Deck internal components arrangement and is not in relation with Forward Fuselage Design.

Explicación

Pregunta 53 de 57

1

The HUD/HMD: 


Selecciona una o más de las siguientes respuestas posibles:

  • Symbology have to be very similar to the Head-Down PFD from consistency point of view to reduce flight crew workload.

  • Selection of De-clutter function removes essential symbology from the HUD and the following symbols will be affected: Attitude, Speed, Altitude, and Heading.

  • Is able to present Enhanced Vision System image of the real world in order to enable pilots to fly with greater confidence and safety under the most challenging visual conditions.

Explicación

Pregunta 54 de 57

1

The main advantage of electronic ink displays (e-ink) versus conventional LCD or plasma displays is:

Selecciona una o más de las siguientes respuestas posibles:

  • The power consumption is very lower (only during updating slot).

  • better color and grayscale

  • are faster.

Explicación

Pregunta 55 de 57

1

The Human Factors Engineering goals are:

Selecciona una o más de las siguientes respuestas posibles:

  • To entirely prevent and predict flight crew error.

  • To maximize the ability of the flight crew operate the airplane.

  • To minimize flight crew error occurrence and manage its effec

Explicación

Pregunta 56 de 57

1

The following requirements must be considered in a Flight Crew Alerting System:

Selecciona una o más de las siguientes respuestas posibles:

  • Emergency alert condition shall require immediate corrective action by the crew

  • Red Warning Messages shall remain presented until the causative condition has been corrected in order to reduce workload.

  • The colour of the Advisory signal shall be aviation yellow.

Explicación

Pregunta 57 de 57

1

Choose a System Operation lesson learned:

Selecciona una o más de las siguientes respuestas posibles:

  • It is possible to specify hard and fast rules to be applied when operating a system.

  • Experience and expertise are crucial to select the most effective method of operation.

  • System operation syllabus and training must provide an expert knowledge of system operation.

Explicación

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