MODULE 5
Digital Techniques / Electronic Instrument Systems
1. An FMS system, besides controlling navigation, thrust and auto-nav, also provides
a) take-off and landing warnings b) dedicated status and warnings c) GPWS warnings
The correct answer is b The FMS is not used for Take Off or Landing The GPWS warnings come from the GPWS Computer
2. EADI sky and ground display is provided by a) synthetic TV signals
b) raster scan
c) stroke pulse
The correct answer is b Pallett - Aircraft Instruments Page 302 Fig. 12.5 3. HSI heading is valid if the heading flag is
a) in view
b) green
c) out of view
The correct answer is c Warning flags 'in view' indicate failure. Normally the only coloured flag used is RED, indicating failure
4. A NOR gate with both inputs inverted becomes a
a) NAND gate
b) AND gate
c) OR gate
The correct answer is b Read up on logic gates - you need to know much more than you needed for Module 4
5. An ARINC 429 binary coded decimal data word occupies bits
a) 11 to 28
b) 11 to 29
c) 1 to 8
The correct answer is b Pallett - Aircraft Instruments Page 159 6. A fibre optic cable consists of
a) a plastic core with a cladding having a higher refractive index b) a silica glass core with a cladding having a higher refractive index c) a silica glass core with a cladding having a lower refractive index The correct answer is c See www.commspecial.com/fiberguide
7. The command bars on an ADI relate to a) path required
b) path being followed
The correct answer is a Pallett - Aircraft Instruments Page 212
8. The recording medium in an FDR is a) a high density floppy disc
b) magnetic tape coated with ferrite c) copper foil coated with ferrite The correct answer is b See www.l-ar.com/html/history.html 9. Convert 0111012 to octal
a) 25
b) 33
c) 35
The correct answer is c The OCTAL code has 8 digits, 0 - 7. To convert binary to octal divide the binary number into groups of three starting from the right. You've got to know your binary, octal, hex and bcd conversions!
10. What does the CADC feed
a) Altimeter / FMS / secondary radar b) standby altimeter / machmeter
c) cabin pressure controller sensor / machmeter / altimeter The correct answer is c Pallett - Aircraft Instruments Page 179 Fig. 7.12
---
1. ARINC 629 databus is
a) one cable, bi-directional b) two cables, bi directional c) two cables, uni-directional
The correct answer is b Pallett - Aircraft Instruments Page 160 2. Requirements for software control can be found in
a) AWN 45
b) JAR OPS
c) JAR AWO
The correct answer is a AWN 45 has been deleted at issue 133, but the examiners may not know that! (Sinicism, surely not!)
3. Software can be modified by a) licensed avionics engineers
b) the manufacturer
c) The same rules apply as to modifications to hardware The correct answer is c Read up on software control - get a copy of AWNs
4. Two connected fibre optic cable ends are parallel but not quite touching. This is called
b) end to end coupling c) end fire coupling
The correct answer is b There are several websites on fibre optics 5. A disadvantage of a fibre optic cable is
a) shallow bend radius allowed
b) couplings susceptible to ingress of fluid
c) end terminals are susceptible to environmental contamination The correct answer is c www.commspecial.com/fiberguide.htm
6. The inside of a CRT consists of
a) an oxide coating and rare mercury gas b) a phosphor coating and rare mercury gas c) iodine and rare mercury gas
The correct answer is b Pallett - Aircraft Instruments Page 284 7. What kind of light is used in a fibre optic systems?
a) Infrared
b) Visible
c) Ultraviolet
The correct answer is a www.floti.bell.ac.uk/MathsPhysics/light.htm 8. Typical displays on an EHSI are
a) VOR, Map, Plan and weather radar b) VOR, Plan, Map and Attitude c) Engine indications
The correct answer is a Pallett - Aircraft Instruments Pages 302 & 304
9. An EADI display showing a moving runway moves down during the final stages of an approach. The aircraft must
a) fly up
b) fly down
c) hold descent path
The correct answer is b At 200ft, during Approach, the Rising Runway starts to move up the EHSI display until, at touch down, it touches the bottom of the aircraft symbol. If the Rising Runway start to move down again it means that the aircraft is climbing and should FLY DOWN
10. An ARINC 573 data bus is used
a) to input into a Digital Flight Data Recorder b) to input into a FDR Digital Acquisition Unit
c) to supply digital inputs from a Symbol Generator to the EADI and EHSI The correct answer is a The FDR can have different inputs depending upon the age of the
system, modern systems use ARINC 573. The inputs to FDR DAU are only analogue, discreet and ARINC 429. The interface between SGUs, EADI and EHSI is only ARINC 429
1. A flight data recorder can obtain information from aircraft instruments a) provided there is adequate isolation
b) by direct connection to the instruments c) provided there is adequate damping The correct answer is a Read up on Flight Data recording
2. Adding invertors to the two inputs of an AND gate makes a
a) NAND gate
b) OR gate
c) NOR gate
The correct answer is c Read up on logic gates - you need to know much more than you needed for Module 4!
3. An ARINC 429 bus uses
a) a twisted shielded pair of wires
b) two bi-directional twin sheathed and earthed wires c) a single twin wire cable for each transmitter The correct answer is a Pallett - Aircraft Instruments Page 157 4. CRT horizontal beam control is achieved by a
a) square wave
b) sawtooth wave
c) sinusoidal wave
The correct answer is b Northrop Institute of Technology - Electricity & Electronics for Aerospace Vehicles Page 284
5. The ARINC 429 data bus word systems use a) decimal numbering
b) hexadecimal numbering
c) binary coded decimal
The correct answer is c Pallett - Aircraft Instruments Page 156
6. The binary number 11010111 expressed as a decimal is
a) 207
b) 223
c) 215
The correct answer is c Learn binary, octal, hex and BCD conversions 7. The octal number 1001 expressed as a decimal is
a) 65
b) 513
c) 9
The correct answer is b Learn binary, octal, hex and BCD conversions
8. This truth table is for a
A B C
0 0 0
0 1 0
1 1 1
a) NAND gate
b) AND gate
c) OR gate
The correct answer is b Read up on logic gates - you need to know much more than you needed for Module 4!
9. The inputs and outputs of a CADC are
a) pitot and static in; altitude, attitude, CAS and VS out b) pitot and static in; altitude, CAS, mach and VS out c) pitot in; static, altitude, mach, CAS and VS out The correct answer is b Pallett - Aircraft Instruments Page 179 Fig. 7.12 10. EICAS provides the following
a) engine parameters only
b) engine parameters and system warnings only c) engine parameters and engine warnings only The correct answer is b Pallett - Aircraft Instruments Page 377
---
1. During an instrument approach, the glideslope pointer deflects below the glideslope centre mark. This means the aircraft is positioned
a) above the glideslope
b) below the glideslope
c) to the left of the localiser
The correct answer is a Consider the centre of the G/S scale as the aircraft position and the pointer as the centre of the G/S beam
2. Engine parameters are displayed on
a) ECAM
b) EHSI
c) FMSCDU
The correct answer is a Engine parameters can be displayed on ECAM by selecting the Engine Page. See Pallett - Aircraft Instrumnets and Integrated Systems Page 391
3. A central maintenance computer provides
a) ground and flight monitoring and testing on an on-board computer b) ground and BITE testing using a portable control panel
c) display of system warnings and cautions The correct answer is a Read up on BITE systems
4. ARINC 573 is related to what system?
a) INS
b) FDR
The correct answer is b Boeing Maintenance Training notes for B757
5. The rising runway is positioned from information derived from a) barometric height
b) vertical speed
c) radio altimeter
The correct answer is c Boeing Maintenance Training notes for B757
6. Where are the Digital Flight Data Recorder outputs supplied to? a) The recording unit
b) Flight instruments
c) There are no outputs
The correct answer is c Information recorded in the DFDR is only accessable in the shop
7. FMS failure and warnings are a) displayed on EICAS
b) engine warnings only
c) EFIS warnings only
The correct answer is a FMS warnings are displayed on EICAS and EFIS, but the answers given are 'EICAS' or 'EFIS only' so for the purposes of this question the correct answer is EICAS 8. Who is responsible for the operational program of the FMS?
a) The pilot
b) The engineer
c) The manufacturer
The correct answer is a Ambiguous question. Do they mean who is responsible for following the program, if so the answer is 'Pilot' or producing the program, then the answer is 'Manufacturer'
9. Flight director command bars are moved to the correct position by a) position feedback
b) amplifier gain
c) calibration
The correct answer is a Read up on the flight director indication system
10. If a signal has quantity in volts and physical position it is
a) digital
b) synchronous
c) analogue
The correct answer is c This is the definition of an analogue signal
---
1. In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction of the electron beam movement?
a) Vertical
b) No movement
The correct answer is a The Y plates lie horizontal. Use the right hand rule to work out the direction of electron beam movement. Aircraft Instruments & Integrated Systems, Pallett, page 287
2. What is the fixed feature of an ADI? a) The glideslope pointer b) The lateral deviation bar c) The aircraft symbol
The correct answer is c The little aeroplane pianted in the middle of the instrument
3. Primary colours of a CRT are a) red, green and blue b) red, green and yellow c) red, blue and yellow The correct answer is a Rotor Gear Box
4. What information is required before completion of the alignment of an Inertial Navigation System?
a) Aircraft present position
b) Aircraft present position and heading c) Heading and attitude
The correct answer is a Read up on INS
5. IRS accelerometers are mounted a) 60o to each other
b) 45o to each other
c) 90o to each other The correct answer is c Read up on IRS
6. An FMS navigation database is updated a) at the operators request
b) once a month
c) every 28 days
The correct answer is c Read up on FMS navigation data management
7. A single failure of a fly-by-wire system a) has no effect on aircraft operation b) will limit the flight profile
c) will reduce operational heights and speeds
The correct answer is a Redundant FBW systems will continue to fly the aircraft
8. Fly-by-wire load alleviation function in turbulent conditions will result in a) ailerons moving symmetrically upwards
b) ailerons and spoilers moving symmetrically upwards c) spoilers moving symmetrically upwards
The correct answer is b Read up on Load Alleviation system Ailerons move symmetrically upwards and No 4 and 5 spoilers move symmetrically upwards in a gust.
a) ailerons
b) spoilers
c) spoilers and ailerons
The correct answer is c Automatic Flight Control, Pallett and Coyle Page 296 10. The movement of fly-by-wire control surfaces are
a) hydraulically controlled and electrically actuated b) both electrically controlled and electrically actuated c) electrically controlled and hydraulically actuated The correct answer is c Read up on FBW systems
---
1. ARINC 629 current mode couplers are
a) capacitive
b) resistive
c) inductive
The correct answer is c Read up on ARINC 629 and 429
2. On an EADI, the Flight Director command bars show a) the actual path with respect to the required path b) the required path with respect to the actual path c) the path with respect to the horizon
The correct answer is b Read up on ILS system indication
3. What instrument includes a display of a rising runway?
a) EADI
b) EHSI
c) ECAM
The correct answer is a Read up on ILS system indication
4. What are the effects of the X and Y plates on a CRT?
a) X plates move the beam vertically, Y plates move the beam horizontal b) Y plates move the beam vertically, X plates move the beam horizontal c) X and Y plates can move the beam in either direction
The correct answer is b Read up on CRTs
5. ARINC 629 data bus is
a) two buses, unidirectional
b) two buses, bi-directional data flow c) one bus, bi-directional data flow The correct answer is c Read up on ARINC 629 and 429
6. An FMS system, besides controlling navigation, thrust and auto-nav, also provides
a) take-off and landing warnings b) dedicated status warnings
c) GPWS warnings The correct answer is b Read up on FMS
7. In order to maintain HIRF protection, bonding checks between airframe and electrical components carrying voltages greater than 50 volts RMS or DC or main earth return should not exceed
a) 1 megohm
b) 1 ohm
c) 0.05 ohm
The correct answer is b CAAIPs Leaflet 9-1
8. Ribbon cables effected by mutual impedance and current loop leakage should be protected by
a) shielding each individual conductor
b) connecting all conductors to a common earth
c) earthing each alternative conductor to separate point The correct answer is c Read up on cable protection methods
9. EADI sky and ground display is provided by a) synthetic TV signals
b) raster scan
c) stroke pulse
The correct answer is b Read up on CRTs and see what a raster scan is
10. Normal transmission order of ARINC 629 LRUs in periodic mode is in order of
a) power up
b) shortest to largest TG c) shortest to largest TI
The correct answer is b Aircraft Electricity and Electronics Eismin Page 149
---
1. What frequency creates the raster effect on a CRT?
a) 50/60 Hz
b) 400 Hz
c) 250Hz
The correct answer is a Read up on CRTs
2. If an EFIS has 3 symbol generators, what is the purpose of the 3rd symbol generator?
a) Comparison with No.1 symbol generator
b) Standby
c) Parity function The correct answer is b Read up on EFIS
3. The sweep waveform used on a electromagnetic CRT is
b) sinusoidal
c) sawtooth
The correct answer is a Do not get confused with an electrostatic CRT. Electromagnetic CRT uses trapezoidal waveform to overcome the impedence of the coil
4. FMS operational program is updated every
a) 7 days
b) 28 days
c) 90 days
The correct answer is b Read up on FMS 5. Fibre optic data is sent by
a) modulating the frequency of a laser beam b) modulating the frequency of a filament beam c) a strobe light
The correct answer is a Read up on fibre optics
6. What is 345 in binary?
a) 100111001
b) 110011001
c) 101011001
The correct answer is c You've got to know your binary, octal, hex and bcd conversions!
7. Which logic gate can be represented as a parallel circuit?
a) OR gate
b) Exclusive OR gate
c) NAND gate
The correct answer is a Read up on logic gates - you need to know much more than you needed for Module 4!
8. Software documentation procedures are laid down in
a) AWN 45
b) JAA Ops
c) MOE
The correct answer is a AWN 45 has been deleted at issue 133, but the examiners may not know that! (Sinicism, surely not!)
9. HIRF is prevented from entering a fibre optic cable by a) enclosing it in a metal braid
b) grounding the fibre at both ends c) using an opto-isolator coupling
The correct answer is c Although a fiber optic cable is 'immune' from collecting HIRF, it can still transmit HIRF which has been picked up by the source circuitry. An optoelectronic isolator will filter out the HIRF prior to transmission.
10. In an ARINC 429 wordstring, bits 1 to 8 represent the a) source of message
b) monitored parameter
The correct answer is b Both a and b are correct. Aircraft Instruments and Integrated Systems Pallett Page 158 says 'source of the message', whereas ARINCs own tutorial (See FORUM Mod.5) says 'bits 8-1 contain parameter' (which Pallett's book also infers on Page 159).
---
1. ARINC 629 terminal transmit interval is a) unique to each terminal
b) common to each terminal
c) when all terminals are quiet
The correct answer is b The ARINC 629 TI is common to all LRUs.
2. Continuity of a fibre optic cable is checked by a) a light source and an opto-power meter b) a calibrated light source
c) a calibrated light source and an optometer The correct answer is c See http://www.tpub.com/neets/tm/109-13.htm
3. To shield a fibre optic from EMI you must a) earth both transducer and couplings b) shield it with a braided shield c) use an opto-isolator
The correct answer is c Read up on fibre optics
4. A simbol generator displays ESDs warning. During replacement
a) you must wear a wrist strap connected to an approved earth point b) make sure the pins are not touched and covers fitted
c) you must earth the unit to the airframe structure
The correct answer is b See Pallett's Micro Electronics In Aircraft Systsems or CAAIPs 9-4 para.7.1.3.
5. Magnetic deflection on a CRT is achieved by a
a) sawtooth waveform
b) trapezoidal waveform
c) sinusoidal waveform
The correct answer is b Read up on CRTs - do not get confused with electrostatic deflection types - which are more common on aircraft
6. An FDR fitted to a helicopter begins recording
a) on take-off
b) on engine start-up
c) when power is applied to the aircraft The correct answer is b See ANO Art 53 para.1
7. MIL-ST-1533 is a data bus for a) Flight Data Recorders b) Inertial Reference System
The correct answer is c Read up on MIL-ST-1533 - a military version of ARINC 429
8. Making an invertor from a NAND or NOR gate is achieved by a) inverting the input
b) connecting two in series c) connecting the inputs The correct answer is c Read up on logic gates
9. Parallel to series conversion is achieved by a) a parallel to series converter b) a shift register
c) a multiplexer / demultiplexer
The correct answer is b Read up on parallel to series converion 10. The FMS databases consist of
a) one navigation and one performance database b) two performance and one navigation database c) one performance and two navigation databases
The correct answer is c Normally we consider the FMS as having 2 databases (1 navigational and 1 performance). (Jeppesen Avionics Fundamentals Page 385). However, the Navigational database is split in two. 1 is for Jeppesen data, uploaded on the ground, the other is for pilot input data (additional waypoints etc.). See http://www.b737.org.uk/fmc.htm for more
---
1. The FMS can update the IRS position outputs by using information from either
a) VOR and DME only
b) DME and GPS only
c) GPS, DME, LOC and VOR The correct answer is c Read up on INS/IRS 2. The accepted error from INS/IRS is a) 1 mile/hour + 3 miles b) 2 miles per hour + 3 miles c) 3 miles / hour + 3 miles The correct answer is c Read up on INS/IRS
3. Before an IRS can complete the alignment sequence a) the shutdown present position must be entered b) the current present position must be entered c) either the last or current position must be entered The correct answer is b Read up on INS/IRS
4. Within a computer controlled flight system, position feedback is converted from a) analogue to digital
b) digital to analogue
The correct answer is a Read up on computer controlled flight
5. What shape does the waveform take to counter the impedance effect of the coils in an electromagnetic controlled CRT?
a) Trapezoid
b) Sawtooth
c) Rectangular
The correct answer is a Read up on CRTs - do not get confused with an electrostatic CRT
6. What warnings can an FMS provide? a) Discrete warnings
b) Spurious faults c) Ground faults only
The correct answer is a This means it can warn of inoperative equipment, but not when equipment is providing incorrect data
7. Centralised Aircraft Monitoring System
a) performs in-flight and ground tests of aircraft systems by carrying out a BITE interrogation
b) give red warnings and amber cautions to display system status c) performs in-flight BITE interrogation only
The correct answer is b Read up on ECAM
8. The control of the speed or rate that the flight director command bars move can be controlled by
a) position feedback b) rate or velocity feedback c) amplifier gain
The correct answer is b Read up on ILS indication
9. The Centralised Aircraft Monitoring System uses the maintenance mode of operation
a) in the air only
b) on the ground only
c) either in the air or on the ground
The correct answer is b Aircraft Electricity and Electronics, Eismin, 5th Edition Page 359
10. The third EFIS Symbol Generator is operated
a) with EICAS
b) in an emergency
c) as a standby to the No1 and No2 system The correct answer is c Read up on EFIS
---
1. What functions are available on the EHSI? a) Full arc and Wx only
b) Full arc, Wx and Map Mode c) Full Arc only
The correct answer is b Read up on EFIS
2. EFIS displays of the right hand and left hand displays are compared by comparators in the
a) FMS
b) EICAS
c) Symbol Generators The correct answer is c Read up on EFIS
3. What is the approximate earth rate?
a) 5o/hour
b) 10o/hour
c) 15o/hour
The correct answer is c Aircraft Instruments and Integrated Systems. Pallett Page 102
4. An IRS platform has a) two accelerometers
b) three accelerometers
c) two or three accelerometers depending on the system The correct answer is b Jeppesen Avionics Fundamentals Page 137
5. IRS Laser Ring Gyros provide a) rate movement about an axis b) displacement about an axis
c) both rate and displacement about an axis The correct answer is a Jeppesen Avionics Fundamentals Page 137
6. What are the outputs of a Digital ADC a) TAS, MACH, Altitude, TAT and SAT b) TAS, MACH and Altitude c) TAS, MACH, Altitude and TAT
The correct answer is a Both Static and Total Air Temperatures are outputs of a digital ADC
7. ARINC 629 periodic mode is used for a) normal operation
b) transferring data only on events important to aircraft operation c) database loads
The correct answer is a Read up ARINC 429 and 629 8. A fibre optic data bus used on an aircraft a) connects non-essential systems only
b) can transmit on several channels at the same time c) can send only one message at a time
The correct answer is b Read up on fibre optics 9. Light travels along a fibre optic by
a) reflection
c) dispersion
The correct answer is a Read up on fibre optics
10. Manufacturers of aircraft can ensure HIRF protection by
a) designing specific avionic areas that are shielded against HIRF b) ensuring all single wires are shielded with metal conduit
c) advising operators of all points susceptible to deterioration due to corrosion, moisture ingress, flexing etc.
The correct answer is a Understanding HIRF By Gerald L. Fuller ---
1. How is data coupled to an ARINC data bus? a) By a capacitive pickup
b) By an inductive pickup c) By a resistive pickup
The correct answer is b Read up on ARINC 429 and 629 data bus systems 2. An AND gate output is 1 when inputs are
a) both 0
b) 1 and 0
c) both 1
The correct answer is c Read up on logic gates 3. What is hex 110 in decimal
a) 272
b) 282
c) 32
The correct answer is a Read up on hexadecimal numbering system
4. Convert the binary word 1100 to decimal
a) 16
b) 12
c) 11
The correct answer is b Read up on binary to decimal converion 5. How does MIL-STD-1533 put data onto the data bus? a) Through the bus controller
b) R1 (remote terminal)
c) SSIFU (sub-system interface unit)
The correct answer is a Read up on MIL-STD-1533 data bus systems
6. If a data message is made up of 1 and 0 it is
a) analogue
b) digital
c) logic
7. Convert the binary word 1110 to decimal
a) 12
b) 14
c) 15
The correct answer is b Read up on binary to decimal converion
8. What sort of gate requires two positive voltages to operate
a) NOT
b) OR
c) AND
The correct answer is c Read up on logic gates
9. What is the main disadvantage of a fibre optic data bus? a) Bend radius and moisture ingress at connections
b) Less strong and durable when compared to twisted pair and coaxial cable
c) Expensive to install The correct answer is a Read up on fibre optics
10. When 4 binary serial counters are connected in cascade for frequency division, what division factor is required
a) 4
b) 8
c) 16
The correct answer is c Each serial counter changes its state once every 2 clock pulses. So 4 serial counters devides by 2x2x2x2 = 16
---
1. Magnetic deflection in a CRT is achieved by a) a sawtooth waveform
b) a trapezoidal waveform c) a sinusoidal voltage
The correct answer is b Do not get confused with electrostatic deflection (plates), which would be sawtooth
2. Fly By Wire systems in the fully active mode, the actuators will a) both be active
b) one in active mode, one in damping mode c) both be in damping mode, awaiting control inputs The correct answer is b Read up on Fly by Wire
3. The parity bit in digital information is used a) for BITE programs
b) to check the validity of data information c) to check the status of the system
4. On a Fly By Wire system, what controls the stab trim
a) ELAC
b) ELAC and SEC
c) SEC
The correct answer is b ELAC = Elevator Aileron Computer, SEC = Spoilers Elevator Computer and FAC = Flight Augmentation Computers (rudder)
5. A disadvantage of a fibre optic cable is a) shallow bend radius
b) couplings susceptible to ingress of fluid
c) liable to environmental contamination of end terminals The correct answer is c Read up on fibre optics
6. ARINC 429 SDI word format is at bits
a) 1 - 8
b) 9 - 10
c) 32
The correct answer is b SDI = Source Destination Ident
7. Convert the binary number 110010 to decimal
a) 80
b) 50
c) 34
The correct answer is b Read up on decimal conversions
8. What is serial to parallel and vice-versa called
a) Encoder/Decoder
b) Multiplex/Demultiplex c) Switching
The correct answer is b Read up on multiplexing
9. What is the parity bit for on an ARINC 429 bus
a) To check for corruption during transmission of a word b) To act as a terminal gap in an emergency
c) To delay the signal
The correct answer is a Read up on purpose and use of parity bit
10. 3 binary counters in cascade. What is the division?
a) 8
b) 16
c) 32
The correct answer is a Each serial counter changes its state once every 2 clock pulses. So 3 serial counters devides by 2x2x2 = 8
---
a) the National Aviation Authority
b) engineers
c) the aircraft manufacturers The correct answer is a See AWN 45.
2. A typical fibre optic connector is a) F-type connector
b) coupling type, with lens fitted c) push-pull connector
The correct answer is b Read up on fibre optics.
3. An ARINC 429 word label format is
a) binary
b) octal
c) hexadecimal
The correct answer is b Read up on ARINC 429 word format.
4. Which of the following is an optelectronic device?
a) Triac
b) Thyristor
c) Laser Diode
The correct answer is c Read up on optoelectronic devices (from Module 4).
5. What is the advantage of a single mode fibre optic over ordinary wire?
a) Large bandwidth
b) Small bend radius
c) Not prone to damage
6. How many LRUs can be connected to an ARINC 429 data bus
a) 120
b) 20
c) 60
The correct answer is b Read up on ARINC 429 and 629.
7. Convert the hexidecimal number D into decimal
a) 13
b) 14
c) 14
The correct answer is a Read up on hexidecimal numbering system.
8. Convert decimal 15 into binary
a) 1101
b) 1111
c) 1110
The correct answer is b Read up on decimal to binary conversion. 9. Convert 448 to hex
b) 2416
c) 2216
The correct answer is b read up on octal to hex conversion. 10. When will a NAND gate give logic 0 at the output? a) When both inputs are at 0
b) When both inputs are at 1 c) When the inputs are different The correct answer is b Read up on logic gates.
---
This is exam number 14. You've been here 1 times.
1. How many LRUs can be connected to an ARINC 629 data bus
a) 120
b) 20
c) 60
The correct answer is a Read up on ARINC 429 and 629 data bus systems 2. Convert decimal 15 into hexadecimal
a) E
b) G
c) F
The correct answer is c Read up on hexadecimal numbering system
3. Which logic gate has this truth table
A B C 0 0 0 0 1 1 1 0 1 1 1 0 a) NOT b) Exclusive OR c) NAND
The correct answer is b Read up on logic gates
4. Which logic gate can be represented as a parallel circuit?
a) OR
b) Exclusive OR
c) NAND
The correct answer is a Read up on logic gates
5. What is the definition of level one software? a) Critical
b) Essential
c) Non-essential
6. ESDS bags are sealed by
a) zip locks
b) ESDS labels
c) twine (100% cotton)
The correct answer is c Boeing manual says 100% cotton twine. Other manuals say ESDS label. However, it could be considered that ESDS labels do not 'seal'.
7. What is 345 in binary?
a) 101011001
b) 110011001
c) 100111001
The correct answer is a Read up on decimal to binary conversion
8. What are the values of an ESDS wrist strap? a) 250 kilohms to 1.5 megohms
b) 2 megohms to 5 megohms
c) 2 gigohms to 4 gigohms
The correct answer is a CAAIPs Leaflet 9-4 5.3.1 - closest answer
9. Convert 1D to binary
a) 29
b) 11101
c) 101001
The correct answer is b Read up on hex to binary conversion 10. ARINC 629 terminal transmit interval is a) unique to each terminal
b) common to each terminal
c) is when all transmissions are quiet
The correct answer is b The TI is common to all LRUs on ARINC 629
---
1. Convert 2C hex to octal
a) 54
b) 44
c) 35
The correct answer is a Read up on hex to octal conversions
2. A fibre optic light source is normally a) a filament lamp
b) a laser or LED
c) a strobe light
The correct answer is b Read up on fibre optics
3. What precautions are required when removing ESDS equipment a) Wear a wrist strap connected to an approved ground point b) Keep one hand on the airframe
c) No special precautions are required The correct answer is a Read up on anti-static precautions
4. An ARINC 429 bus uses
a) two bi-directional twin, sheathed and earthed wires b) a twisted shielded pair of wires
c) a single twin cable for each transmitter
The correct answer is b Read up on ARINC 429 and 629 data bus systems
5. The minimum requirement for a cockpit voice recorder to begin operating is a) on engine startup
b) on commencing the takeoff roll
c) once established in the en-route climb
The correct answer is b See ANO Art 53 para.1. Although JAR Ops states that the CVR must begin when the aircraft is capable of moving under its own power.
6. ARINC Communications Addressing and Reporting Systems is used to a) download aircraft status reports
b) connect the aircraft to base c) make telephone calls The correct answer is b Read up on ACARS
7. ARINC 429 data bus systems uses a) decimal numbering
b) hexadecimal numbering
c) binary coded decimal
The correct answer is c Read up on ARINC 429 and 629 data bus systems (429 uses either BCD or binary)
8. With radio coupled autopilot, what are the inputs
a) ADF and ILS
b) ADF and VOR
c) ILS and VOR The correct answer is c Read up on autopilot
9. B-RNAV system must be capable of a) holding six waypoints
b) displaying distance and bearing to waypoint c) reversing the waypoints for "fly-me-home" The correct answer is b Read up on B-RNAV
10. The basic principle of radar is based upon
a) the amount of power in the signal returned
b) the time delay between outward and returning pulse c) ultrasonic wave propagation
The correct answer is b Read up on basic radar theory
1. An ARINC 429 Binary Coded Decimal word occupies word bits
a) 11 - 28
b) 11 - 29
c) 1 - 8
The correct answer is b Two versions of ARINC 429. BCD uses 11 - 29, Binary uses 11 - 28. 2. Engine parameters are displayed on
a) ECAM
b) EHSI
c) CDU
The correct answer is a Read up on ECAM/EICAS systems
3. A flight deck CRT LRU is being replaced. What does the ESDS label indicate? a) Wrist straps should be worn
b) Do not touch plug pins or leave them exposed c) Remove power before connecting
The correct answer is b See Pallett's Micro Electronics In Aircraft Systsems or CAAIPs 9-4 para.7.1.3.
4. What systems does the ADC feed? a) Altimeter / FMS / secondary radar b) Standby altimeter/machmeter
c) Cabin pressure controller sensor / machmeter / Altimeter The correct answer is c Read up on Air DAta Computers
5. A hexadecimal is a number to base
a) 8
b) 2
c) 16
The correct answer is c Read up on hexadecimal numering system
6. An ARINC 429 system uses a
a) 16 bit word over a twisted pair of wires b) 32 bit word over a twisted pair of wires c) 20 bit word over a bi-directional bus
The correct answer is b Read up on ARINC 429 and 629 data bus systems
7. A thyristor is a device which has
a) a positive temperature coefficient b) a negative temperature coefficient c) a temperature coefficient of zero The correct answer is b Read up on thyristos
8. When using a wrist strap, before touching the LRU the resistance should be measured from your skin to the end of the earth probe. This should be
a) more than 10 kilohms
c) less than 1 ohm
The correct answer is a Read up on anti-static precautions
9. 1012 converted to decimal is
a) 52
b) 510
c) 210
The correct answer is b Read up on binary to decimal converions
10. Physical variables in quantitative forms, such as voltage or angular rotation of a shaft are
a) analogue
b) digital
c) binary
The correct answer is a Read up on analogue/digital definitions
---
1. Within a 3 bit frequency cascade, division is to
a) 8
b) 4
c) 2
The correct answer is a Read up on counters
2. When is a radio altimeter active? a) Up to 10,000 ft
b) Up to 2,500 ft
c) Up to 100 ft
The correct answer is b Read up on radio altimeters and ILS
3. Which of the following could be a primary cause of HIRF protection failure? a) Unserviceable radio filters
b) Broken or missing static wicks c) Corrosion on bonding leads
The correct answer is a The exact definition of HIRF does not include electrostatc discharge (ESD). But only interference from outside sources. Understanding HIRF By Gerald L. Fuller
4. The binary coded decimal number 10011000 expressed as a decimal number is
a) 98 b10
b) 152 10
c) 152 2
The correct answer is a Read up on BCD to decimal conversions (BCD is not the same a s binary)
5. The decimal number 7 expressed as a binary number is
a) 111 2
b) 7 2
The correct answer is a Read up on decimal to binary conversions 6. Convert 011101 binary to octal
a) 25
b) 33
c) 35
The correct answer is c Read up on binary to octal conversions
7. Manufacturers of aircraft can ensure HIRF protection
a) by designing specific avionic areas that are shielded against HIRF b) by ensuring all single wires are shielded with metal conduit
c) by advising the operator of parts of the aircraft susceptible to degradation due to corrosion, moisture ingress, flexing etc.
The correct answer is a Understanding HIRF By Gerald L. Fuller
8. An ARINC 629 characteristic is
a) all LRUs can transmit at the same time
b) all LRUs can transmit and receive at the same time c) data can transmit in both directions down the data bus The correct answer is c Read up on ARINC 429 and 629 data bus systems 9. In an ARINC 429 word string, bits 1 - 8 represent
a) the source of the message b) the monitored parameter c) the destination LRU
The correct answer is b Read up on ARINC 429 and 629 data bus systems
10. What limits the number of ARINC 429 receivers on a bus a) The speed and size
b) The parallel input impedance c) The weight
The correct answer is b Read up on ARINC 429 and 629 data bus systems
---
1. The 'fan-in' in a gate is the
a) number of outputs from a gate b) number of inputs to a gate
c) number of inputs and outputs of a gate The correct answer is b Read up on logic gate systems
2. Very Large Scale Integrated (VLSI) means the number of gates in a single IC is
a) up to 1000
b) up to 10,000
c) over 10,000
3. The advantage of DRAM over SRAM is a) they operate slower
b) has a larger storage capacity per chip area c) are cheaper to manufacture
The correct answer is c Read up on memory (RAM) types
4. A BYTE is usually a) a 12 bit word
b) an 8 bit word
c) a six bit word
The correct answer is b Read up on computer terminology
5. Data is transferred on the MIL-STD-1553B by a) bi-polar return to zero
b) manchester bi-phase
c) non return to zero
The correct answer is b Read up on MIL-STD-1553 data bus system
6. The fibre optic cable can be identified on aircraft by its jacket colour which is
a) purple
b) red
c) yellow
The correct answer is a Read up on fibre optics
7. For a fibre optic cable connector that is not regularly disconnected you would use the
a) ceramic lens type
b) ball lens type
c) butt type
The correct answer is c Read up on fibre optics
8. The timebase in a CRT consists of a) an amplifier and an oscillator b) an oscillator only
c) an amplifier only The correct answer is a Read up on CRTs
9. HIRF protection of LRUs is provided by a) built in filters and overvoltage circuits b) internally shielded cables
c) built in filters only
The correct answer is a Understanding HIRF By Gerald L. Fuller
10. An EADI display of flight director commands are coloured
a) cyan
b) red
The correct answer is c Aircraft instruments and integrated systems,(pallet) page 302 fig 12.5 eadi flight director command bars are magenta
---
1. Which systems does a modern ADC give information to?
a) Flight control computer, Air Data Instrument, Engine systems
b) EFIS
c) EICAS
The correct answer is a Read up on Air Data Computer
2. Binary Number: 110010
a) 80
b) 50
c) 34
The correct answer is b Read up on binary to decimal conversion 3. How are engine indications sent to the FDR? a) Via ARINC 573
b) Via ARINC 629
c) Source isolated
The correct answer is a Read up on Flight Data Recorder
4. What is this truth table? A B A.B 0 0 0 1 0 0 0 1 0 1 1 1 a) AND gate b) NOR gate c) NOT gate
The correct answer is a Read up on logic gates
5. Where do the outputs from a DADC go?
a) EADI
b) EHSI
c) IRMP: Inertial Reference Mode Panel
The correct answer is c Read up on Digital AIr Data Computer (IRMP is the control for the Inertial Referencing Unit)
6. During an EFIS screen fit a) use bonding strap b) don’t touch terminals c) no tooling is required
The correct answer is b Microelectronics in Aircraft Systems - Pallet. pg 219
a) leave both ends of the cable screen open circuit b) earth both ends of the cable screen
c) earth only one end of the cable screen The correct answer is c Read up on anti-static precautions
8. How many satellite signals are required to achieve precise 3D positioning?
a) 4
b) 5
c) 6
The correct answer is a Read up on satallite navigation (or GPS) 9. Binary addition of 1101 + 101101 is
a) 58
b) 61
c) 70
The correct answer is a Read up on binary addition and binary to decimal conversions
10. What system uses base 8?
a) ARINC 429, in dataword labels only
b) ARINC 629
c) ARINC 573
The correct answer is a Read up on ARINC 429 data bus word format
---
1. What maintenance problems are associated fibre optics?
a) Corrosion
b) Earthing faults
c) Kinking and contamination of connectors The correct answer is c Read up on fibre optics
2. Who can sign for a software update?
a) Design organization or the aircraft manufacturer
b) Engineer
c) Chief pilot The correct answer is b AWN 43
3. What sort of gate is this?
a) Or gate
b) NOR gate
The correct answer is b Read up on logic gates
4. What creates the raster effect on a CRT? a) Sawtooth frequency
b) Sinusoidal frequency
c) Trapezoidal
The correct answer is a Read up on Cathode Ray Tubes
5. Common fibre optic use is
a) modulating intensity on direct read b) modulating frequency on direct read
c) HIRF
The correct answer is b Read up on fibre optics
6. An aircraft may have been HIRF affected. a) A static wick check is required b) A bonding load check is required
c) Test all radio frequencies for interference The correct answer is a Read up on HIRF protection
7. The binary number 11010111 is expressed as a decimal is:
a) 215
b) 107
c) 53
The correct answer is a Read up on binary to decimal converion
8. The octal number 1001 expressed as a decimal is:
a) 513
b) 613
c) 713
The correct answer is a Read up on octal to decimal conversion
9. With a relative humidity of 10% to 20%, if you walked over a carpet what electrostatic voltage value would you expect to see?
a) 6,000 volts
b) 12,000 volts
c) 35,000 volts
The correct answer is c Read up on static electricity
10. Before fitting a Printed Circuit Board you should check the
a) resistance between skin and strap end plug is less than 10 megohms b) resistance between skin and strap end plug is more than 1 megohms c) resistance between strap and strap end plug is less than 1 megohms The correct answer is c CAAIP Leaflet 9-4 5.3.1
---
a) can only transmit 1 message at a time
b) can transmit several messages simultaneously c) is only used for non essential messages
The correct answer is b Read up on fibre optics
2. The minimum requirement for an aeroplane CVR is a) from power on
b) from engine start
c) from beginning of take off roll
The correct answer is b JAR OPS Para 1.700 (c) OR answer c by CAP 393 Section I Para 53
3. On an ARINC 629 data bus, the maximum amount of current-mode couplers per data bus is
a) 46
b) 120
c) 64
The correct answer is b 120 LRUs maximum (but the B777 uses 46)
4. To connect a LRU to the data bus
a) a current mode coupler, serial interface module and terminal controller is required
b) current mode coupler, terminal controller and a production break is required
c) a terminal controller and interface module only is required The correct answer is a Read up on ARINC 429 and 629 data bus systems
5. A current-mode coupler contains an Core assembly. The purpose of the E-Core is to
a) couple the signal to the data bus
b) provide effective screening of the signal through the current-mode coupler
c) enable easy access for monitoring of the signal The correct answer is a Read up on ARINC 429 and 629 data bus systems
6. The ARINC 429 low rate of transmission is
a) 12-14 Kbits/second with high of 100 kBits/second b) 12-14 Mbits/second with high of 100 Mbits/secon c) 100 kbits/second with high of 12-14 Mbits/second The correct answer is a Read up on ARINC 429 and 629 data bus systems
7. A D to A converter is required to produce an output range of 0 to –10V. This can be achieved by
a) a non inverting op amp connected in series with output b) an inverting op amp connected in series with output c) a differentiator with a 100 Kilohm feedback resistor The correct answer is b Read up on DACs and ADCs
8. A D to A converter would use a precision amplifier to a) ensure that the output voltages remain accurate
b) ensure that the input voltage remains accurate
c) compensate for the variation of the feedback resistor with temperature The correct answer is a Read up on DACs and ADCs
9. A given transducer provides a voltage which corresponds to true heading. This voltage can be converted to 'bits' by using a
a) commutator
b) digital to analogue converter c) analogue to digital converter The correct answer is c Read up on DACs and ADCs
10. The output of a NOT gate is logic 1. The input is a) logic 1
b) logic 0
c) both logic 1
The correct answer is b Read up on logic gates
---
1. An ARINC 629 bus cable is a twisted pair of wires with a) a 130 ohm resistor at one end
b) a 230 ohm resistor at one end c) a 130 ohm resistor at both ends
The correct answer is c Read up on ARINC 429 and 629 data bus systems
2. An ARINC 629 stub cable
a) connects bi-directional data between the LRU and current mode coupler b) connects single directional data between the LRU and current mode coupler
c) connects bi-directional data between two LRUs The correct answer is a Read up on ARINC 429 and 629 data bus systems
3. Care must be taken when installing ARINC 629 cables into bus panels, damage to cables can cause
a) arcing of high voltage signals
b) standing waves.
c) corrosion of the conductor
The correct answer is c Read up on ARINC 429 and 629 data bus systems
4. An aircraft data bus system
a) cannot use both ARINC 629 and ARINC 429 data buses.
b) can use both ARINC 629 and ARINC 429 as they are compatible. c) can use both systems, ARINC 629 and ARINC 429 via system card files and signal gateways
The correct answer is c Read up on ARINC 429 and 629 data bus systems
a) a simple integration
b) a differentiation followed by an integration c) two successive integrations
The correct answer is c Read up on acceleration - velocity - distance computations
6. Before the aircraft is moved from the loading pier the pilot must a) insert the latitude and longitude of the pier into the IRS b) set the altitude to be fed into the INS
c) insert the longitude and latitude of the first waypoint into the INS The correct answer is a Read up on Inertial Reference Systems
7. A 12 bit 16 Channel encoder will use a multiplexer with a) 2 wire series address line
b) 3 bit parallel address line c) 4 bit parallel address line The correct answer is a Read up on multiplexing
8. An A to D converter uses successive approximation to a) increase resolution
b) increase speed
c) increase accuracy
The correct answer is b Read up on ADCs and DACs
9. An R-2R D to A converter uses
a) two values of resistors whose precision is not important b) two values of precision resistors
c) resistors whose values are logarithmic The correct answer is b Read up on ADCs and DACs
10. A fiber optic cable to LRU connector should be connected a) using torque-loaded pliers
b) hand tight only
c) very carefully to ensure alignment and reduce light loss The correct answer is c Read up on fibre optics
---
1. An IRS has
a) accelerometers fixed to the airframe and gyros on a stable platform b) accelerometers and gyros fixed to a the airframe
c) accelerometers on a stable platform and gyros fixed to the airframe The correct answer is b Read up on IRS
2. An IRS system requires data for wind computation from a) central Air Data Computer
b) satellites
The correct answer is a Read up on IRS
3. The FMS carries out a Rho/Theta navigation function, the purpose of this is to a) update the IRS system with an accurate position fix of latitude and longitude
b) to update the EMS with the new lateral flight profile for the flight plan c) to update the VOR and DME systems with an accurate position fix The correct answer is a Read up on FMS - IRS update function
4. The FMS is updated
a) by the aircrew by reference to the Tech Log b) automatically by update data from the ACARS
c) by an aircraft engineer updates the system either by a magnetic tape or floppy disc
The correct answer is c Read up on FMS database updating 5. Pitch Control of a fly by wire system is achieved by a) elevators only
b) stabilizer and elevator c) stabilizer only
The correct answer is b Read up on fly-by-wire
6. In a fly by wire system, if the pilot control input is derived from a side stick controller:
a) control surface feedback is fed to the side stick b) there is no control surface feedback to the side stick
c) there will be only control surface feedback to the side stick after a computer failure
The correct answer is b Read up on fly-by-wire
7. In memory using multivibrators, when power is switched off the datawill a) still be available on power up
b) be lost
c) automatically be downloaded The correct answer is b Read up on RAM types
8. The resistance of the wrist strap used as part of anti static precautions should be
a) 0 - 200 ohm
b) 250 kilohm - 1.5 megohm
c) 20 megohm - 200 megohm The correct answer is b CAAIPs Leaflet 9-4 5.3.1
9. What is the function of a status register in a microprocessor? a) To indicate the status of the processor
b) In the ALU, to store the position of the program during an interrupt c) To synchronize the clock pulse
The correct answer is a <See http://www.i-garden.org/docu/cecs/cs14.pdf
a) Cheaper to produce
b) Can be re-programmed
c) Does not need refreshing The correct answer is b Read up on RAM types
---
1. A basic IRS platform has
a) 3 accelerometers and 2 laser gyros b) 2 Accelerometers and 3 laser gyros c) 3 accelerometers and 3 laser gyros
The correct answer is c Jeppesen Avionics Fundamentals Page 137
2. What must be entered into the IRS before the aircraft can be moved? a) Present position
b) Flight plan
c) Cruise height The correct answer is a Read up on IRS
3. The FMS Operational Data Base is a) updated once a month
b) is fed with information on aircraft weight, cruise altitude and cost index before take off
c) needs no update information The correct answer is b Read up on FMS databases
4. Control surface feedback is fed back to a) the Flight Control Computer only
b) the Flight Control Computer and side stick controller c) the side stick controller only
The correct answer is a Read up on fly by wire
5. The function of a commutator is to
a) convert from analogue to binary form
b) provide a sampling in sequence of a number of parameters
c) provide continuous availability of all parameters connected to the system The correct answer is b Read up on DACs and CADs
6. When the voltage that represents a logic 1 state is less than the voltage that represents a logic 0 state, the logic being used is
a) either positive or negative
b) positive
c) negative
The correct answer is c Read up on logic systems
7. The output of an AND gate having two inputs A and B is logic 1. The two inputs will have the logic states of
b) A = 1, B = 1 c) A = 1, B = 0
The correct answer is b Read up on logic gates
8. Registers are used in digital computers to
a) store bits of information in a permanent memory
b) store a limited amount of information on a temporary basis c) keep a count of operations completed
The correct answer is b Read up on CPU architecture 9. What is 0111000012 in Octal? a) 281 10 b) 225 8 c) 341 8
The correct answer is c Read up on binary to octal conversions
10. ARINC 629 is used for a) normal flight
b) emergency only
c) a backup to ARINC 429
The correct answer is a Read up on the ARINC 429 and 629 data bus system
---
1. Testing of HIRF on aircraft systems is done
a) by periodically listening for interference on all systems b) at and during production and testing (initial certification) c) only after a report of radio interference
The correct answer is b Understanding HIRF By Gerald L. Fuller
2. How are earth loops prevented from forming? a) Ground only one end of the cable screen b) Ground both ends of the cable screen c) Ground neither end of the cable screen The correct answer is a Read up on HIRF protection
3. When carrying out a bonding check on a surface protected by anodic film a) the anodic film should be removed locally to ensure a good contact b) the film is conductive so no preparations are required
c) add a bonding factor to the result of the test to account for the resistance of the anodic film
The correct answer is a Read up on electrical testing
4. The accelerometer output in an INS/IRS is a) integrated twice to give velocity
b) integrated twice to give distance c) integrated once to give distance
The correct answer is b Read up on acceleration - velocity - distance computations
5. An INS/IRS Battery Unit provides
a) standby power when airborne and on the ground b) standby power only whilst in flight
c) standby power only on the ground
The correct answer is a Aircraft Instruments and Integrated Systems. Pallett Page 247 & 248
6. The FMS Navigation Data Base must be updated
a) once a month
b) every 28 days
c) before each flight to establish the flight plan The correct answer is b Read up on FMS databases
7. If a fly by wire actuator loses hydraulic power the control surface will a) automatically move back to the neutral position
b) remain rigid in the failure position
c) remain in the failure position but may move due to aerodynamic pressure The correct answer is c Read up on fly by wire systems
8. The output of an OR gate having two inputs A and B is logic 0. The two inputs will have the logic states of
a) A = 0, B = 0
b) A = 1, B = 0
c) A = 0, B = 1
The correct answer is a Read up logic gates
9. When clamping cable looms containing co-axial cables
a) avoid distortion to the co-axial cable to maintain the dielectric constant b) distortion of the outer sheath is allowed providing the inner cable is not affected
c) the clamps must be no more than 1 metre apart The correct answer is a Read up on cable installations
10. When incorporating an aerial cable it must be a) in the centre of the other wires
b) outside the other wires for easy access c) positioned separately from the loom The correct answer is c Read up on cable installations
---
1. Some of the advantages of fiber optic cable over copper cable are
a) non conductive, easy to manufacture and assemble, higher bandwidth b) smaller size and weight, non conductive, more rugged, higher security
c) non conductive, higher bandwidth, higher security, smaller size and weight
The correct answer is c Read up on fibre optics
2. When carrying out airframe bonding checks as part of a program of HIRF prevention the airframe bonding resistance should be less than
a) 50 milliohms
b) 100 milliohms
c) 1 ohm
The correct answer is a Read up on HIRF protection
3. LCD screens are driven by
a) AC voltage
b) variable current DC voltage c) fixed current DC voltage
The correct answer is a See discussion in Forum Module 5 for details
4. IRS alignment
a) takes up to 10 minutes and the present position can be entered at any time during alignment
b) takes up to 10 minutes and present position must be entered before alignment.
c) takes up to 10 minutes and the previous flight shut down present position is used for the alignment
The correct answer is a Read up on IRS
5. A fault light appears on the IRS Mode Selector Unit during the alignment sequence. The correct action is
a) immediately switch off and select the standby system.
b) select HDG/STS on the Inertial System Display Unit (ISDU), observe the action code in the right alpha/numeric display
c) refer to the warning display on the EICAS/ECAM system. The correct answer is b Read up on IRS
6. EFlS systems have two control panels, their purpose is
a) to provide display control by one control panel whilst the other provides a standby
b) one for the EADI display and one for the EHSI display
c) one to control the type of EFlS display and the other to select the source of the information being displayed
The correct answer is c Read up on EFIS
7. A FMS has a total of how many Data Bases
a) 1
b) 2
c) 4
The correct answer is b Read up on FMS databases (navigation and performance databases)
a) to prevent high speed stall
b) to increase the pitch angle as speed increases c) to prevent tuck under
The correct answer is c Read up on fly by wire
9. In a single mode fibre optic cable
a) several waves travel down the cable
b) the diameter of the cable is dependent on the wavelength of the light used*
c) the distortion of the signal occurs is dependent on the length of cable The correct answer is b Read up on fibre optics
10. A semiconductor which emits photons and releases electrons when stimulated by photons is called
a) an LED
b) a photodiode
c) a laser diode
The correct answer is c Read up on laser diodes (Light Amplification by Stimulated Emission of Radiation)
---
1. An IRS Laser gyro provides
a) detection of the rate of movement about an aircraft axis b) detection of the earth’s rotation to establish true north
c) detection of the earth’s gravitational force to establish true north The correct answer is a Jeppesen Avionics Fundamentals Page 137
2. A Liquid Crystal Display (LCD) has the advantage over a CRT because a) it displays more colours
b) it requires less servicing c) it requires no cooling The correct answer is c Read up on LCDs and CRTs
3. The left and right cockpit displays
a) are supplied from separate Symbol Generators at all times b) are supplied from the same Symbol Generator
c) will only be supplied from the same symbol generator when all other symbol generators have failed
The correct answer is c Read up on EFIS
4. A single failure of a fly by wire control surface computer will
a) cause the system to revert to an alternate law of operation b) cause the system to revert to a direct law of operation c) not have any operational effect on the system
The correct answer is c Read up on fly by wire systems
