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05.03. Data Conversion. Explanation. NIL.

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Question Number. 1. If a signal has Question Number. 5. Physical variables

quantity in volts and physical position it is. in quantitative forms, such as voltage or angular
rotation of a shaft are.
Option A. digital. Option A. digital.
Option B. synchronous. Option B. analogue.
Option C. analogue. Option C. binary.
Correct Answer is. analogue. Correct Answer is. analogue.
Explanation. This is the definition of an Explanation. NIL.
analogue signal.

Question Number. 6. A D to A converter

Question Number. 2. Within a computer is required to produce an output range of 0 to 10V.
controlled flight system, position feedback is This can be achieved by.
converted from. Option A. a non inverting op amp connected
Option A. position feedback to rate in series with output.
feedback. Option B. an inverting op amp connected in
Option B. analogue to digital. series with output.
Option C. digital to analogue. Option C. a differentiator with a 100 Kilohm
Correct Answer is. analogue to digital. feedback resistor.
Explanation. NIL. Correct Answer is. an inverting op amp
connected in series with output.
Explanation. NIL.
Question Number. 3. What is serial to
parallel and vice-versa called?.
Option A. Switching. Question Number. 7. A D to A converter
Option B. Multiplex/Demultiplex. would use a precision amplifier to.
Option C. Encoder/Decoder. Option A. compensate for the variation of
Correct Answer is. Multiplex/Demultiplex. the feedback resistor with temperature.
Explanation. NIL. Option B. ensure that the output voltages
remain accurate.
Option C. ensure that the input voltage
Question Number. 4. A thyristor is a remains accurate.
device which has. Correct Answer is. ensure that the output
Option A. a positive temperature coefficient. voltages remain accurate.
Explanation. NIL.
Option B. a negative temperature
coefficient.
Option C. a temperature coefficient of zero. Question Number. 8. A given transducer
provides a voltage which corresponds to true
Correct Answer is. a negative temperature heading. This voltage can beconverted to 'bits' by
Page

coefficient. using a.

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Option A. analogue to digital converter. Question Number. 12. An encoder using

Option B. digital to analogue converter. Grey code.
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Option C. commutator. Option A. changes analogue to binary.

Correct Answer is. analogue to digital Option B. changes digital to analogue.
converter. Option C. changes analogue to digital.
Explanation. NIL. Correct Answer is. changes analogue to
digital.
Explanation. NIL.
Question Number. 9. An A to D
converter uses successive approximation to.
Question Number. 13. An analogue to
Option A. increase resolution. digital converter is as accurate as.
Option B. increase accuracy. Option A. the frequency.
Option C. increase speed. Option B. the sampling rate.
Correct Answer is. increase speed. Option C. the amplitude.
Explanation. NIL. Correct Answer is. the sampling rate.
Explanation. NIL.

Question Number. 10. An R-2R D to A

converter uses. Question Number. 14. A digital to
Option A. two values of resistors whose analogue converter that requires the output to
precision is not important. range between 0v and -10v would have.
Option B. two values of precision resistors. Option A. a non-inverting amplifier in line
with the output with a resistor to ground.
Option C. resistors whose values are Option B. an inverting amplifier in series
logarithmic. with the output line.
Correct Answer is. two values of resistors Option C. a non-inverting amplifier in parallel
whose precision is not important. with the output line.
Explanation. NIL. Correct Answer is. an inverting amplifier in
series with the output line.
Explanation. NIL.
Question Number. 11. The function of a
commutator is to.
Option A. convert from analogue to binary Question Number. 15. In an analogue to
form. digital converter, the input voltage.
Option B. provide continuous availability of Option A. is switched by the digital input.
all parameters connected to the system. Option B. is intermittent.
Option C. provide a sampling in sequence of Option C. stays on constantly.
a number of parameters. Correct Answer is. stays on constantly.
Correct Answer is. provide a sampling in Explanation. NIL.
sequence of a number of parameters.
Explanation. NIL.
Question Number. 16. An R-2R Converter
Page

has values or resistance.

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Option A. whose relative precision are

accurate. Question Number. 20. Transistors are
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Option B. whose precision are not accurate. used in a current triggered D to A device to.

Option C. whose precision are accurate. Option A. switch off the inputs.
Correct Answer is. whose precision are not Option B. switch on the input.
accurate. Option C. change the state of the inputs.
Explanation. NIL. Correct Answer is. change the state of the
inputs.
Explanation. NIL.
Question Number. 17. What does 1
represent in an analogue system?.
Option A. High frequency Question Number. 21. Op amps generally
Option B. Switches closed, magnetised used in ADCs and DACs are normally.
Option C. Switches open, unmagnetised Option A. high input impedance, high output
Correct Answer is. Switches closed, impedance.
magnetised Option B. high input impedance, low output
Explanation. NIL. impedance.
Option C. low input impedance , how output
impedance.
Question Number. 18. Audio sounds Correct Answer is. high input impedance, low
recorded digitally. output impedance.
Option A. are superior quality and graeter Explanation. NIL.
bandwidth.
Option B. are narrow bandwidth.
Option C. are not as accurate due to clipping Question Number. 22. Analogue logic 1
and input errors. is.
Correct Answer is. are superior quality and Option A. closed switch, Logic Q=0.
graeter bandwidth. Option B. closed circuit, Logic Q=1.
Explanation. NIL. Option C. open circuit.
Correct Answer is. closed circuit, Logic Q=1.

Question Number. 19. An analogue to Explanation. NIL.

digital converter where it counts up to binary state
equal to the analogue input and then back down
when this is reached is a. Question Number. 23. An ADC uses
Option A. a ramp type converter. successive approximation to.
Option B. successive approximation counter. Option A. increase speed.
Option B. increase accuracy.
Option C. flash type converter. Option C. increase resolution.
Correct Answer is. a ramp type converter. Correct Answer is. increase speed.
Explanation. Digital Fundamentals T L Floyd Explanation. NIL.
page 790.
Page

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Question Number. 24. A DAC uses a Explanation. Digital Fundamentals by Thomas L

precision amplifier to. Floyd.
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Option A. ensure the output voltages remain

accurate.
Option B. compensates for the variation of Question Number. 28. A charge balancing
the feedback resistor due to temperature. ADC uses.
Option C. ensure the input remains accurate. Option A. successive approximation logic
circuit to control the output.
Correct Answer is. ensure the output voltages Option B. a closed loop system to compare
remain accurate. the analogue input to give the required digital
Explanation. NIL. output.
Option C. a closed loop system to check the
analogue input with the input sample.
Question Number. 25. A precision op- Correct Answer is. a closed loop system to
amp is used in a DAC to. compare the analogue input to give the required
Option A. compensate for temperature digital output.
variation. Explanation. NIL.
Option B. give output at required level.
Option C. make output between 0 - 5V.
Correct Answer is. give output at required Question Number. 29. Sample and hold is
level. a technique used in.
Explanation. NIL. Option A. D to A conversion.
Option B. Moving coil instruments.
Option C. A to D conversion.
Question Number. 26. In an R-2R ladder Correct Answer is. A to D conversion.
converter the values of resistors. Explanation. NIL.
Option A. do not need to be of precise
values.
Option B. only the first resistor need to be Question Number. 30. An analogue to
precise. digital converter (ADC) requires the following.
Option C. are precise.
Correct Answer is. do not need to be of Option A. a reference voltage, an input gate,
precise values. an internal counter, a comparitor.
Explanation. NIL. Option B. a reference voltage, an input gate,
a comparator.
Option C. a reference voltage, an input gate,
Question Number. 27. What is the an internal counter.
quickest method of analogue to digital Correct Answer is. a reference voltage, an
conversion?. input gate, a comparator.
Option A. Voltage to frequency. Explanation. NIL.
Option B. Flash converter.
Option C. Single ramp method.
Correct Answer is. Flash converter.
Page

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Question Number. 31. What is Option C. if its not soaked, a minimum

'Throughput Rate' for the A/D converter?. temperature of 20 degrees C taken as OAT.
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Correct Answer is. it must be soaked and

Option A. Number of complete digital words ambient temperature allowance taken into
encoded in a specified unit of time. consideration.
Option B. None of the above. Explanation. NIL.
Option C. Speed of variable resistor which
senses the analogue signal.
Correct Answer is. Number of complete Question Number. 35. A Digital to
digital words encoded in a specified unit of time. Analogue Converter has a resolution of 0.3 Volts.
What will be the analogue output when the digital
Explanation. NIL. input is 10110.
Option A. 6.6 Volts RMS.
Option B. -6.6 Volts DC.G36.
Question Number. 32. What is the Option C. 6.6 Volts DC.
Resolution of A/D and D/A converters?. Correct Answer is. 6.6 Volts DC.
Option A. Resolution of the Instrument Explanation. NIL.
which displays the values.
Option B. Number of discrete values that can
be represented by the digital word. Question Number. 36. A number
Option C. Rate at which data is converted. represented as a physical quantity, e.g. voltage or
Correct Answer is. Number of discrete values speed of rotation is.
that can be represented by the digital word. Option A. digital.
Explanation. NIL. Option B. maximum value.
Option C. analogue.
Correct Answer is. analogue.
Question Number. 33. Digital signals can Explanation. NIL.
be represented.
Option A. only as a binary value. 05.04. Data Buses.
Option B. by a series of integers.
Option C. by real numbers.
Correct Answer is. by a series of integers. Question Number. 1. In arinc 629, LRUs
Explanation. NIL. are programmed to transmit.
Option A. one at a time.
Option B. one transmits and one recieves.
Question Number. 34. When testing EGT Option C. all at the same time.
probe. Correct Answer is. one transmits and one
Option A. it must be soaked and ambient recieves.
temperature allowance taken into consideration. Explanation. NIL.

Option B. not necessarily soaked but

ambient temperature must be taken into Question Number. 2. In aircraft use,
consideration. fibre optic cables should comply with.
Page

Option A. ARINC 629 standard.

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Option B. ARIND 429 standard. Explanation. Pallett - Aircraft Instruments Page

Option C. ARIND 636 standard. 157.
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Correct Answer is. ARIND 636 standard.

Explanation. NIL.
Question Number. 6. The ARINC 429
data bus word systems use.
Question Number. 3. ARINC 629 Option A. binary coded decimal.
databus is. Option B. decimal numbering.
Option A. one cable, bi-directional. Option C. hexadecimal numbering.
Option B. two cables, uni-directional. Correct Answer is. binary coded decimal.
Option C. two cables, bi directional. Explanation. Pallett - Aircraft Instruments Page
Correct Answer is. two cables, bi directional. 156.

Explanation. NIL.
Question Number. 7. ARINC 573 is
related to what system?.
Question Number. 4. An ARINC 573 data Option A. Weather Radar.
bus is used. Option B. FDR.
Option A. to input into a Digital Flight Data Option C. INS.
Recorder. Correct Answer is. FDR.
Option B. to supply digital inputs from a Explanation. Boeing Maintenance Training
Symbol Generator to the EADI and EHSI. notes for B757.
Option C. to input into a FDR Digital
Acquisition Unit.
Correct Answer is. to input into a Digital Question Number. 8. ARINC 629 current
Flight Data Recorder. mode couplers are.
Explanation. The FDR can have different inputs Option A. capacitive.
depending upon the age of the system, modern Option B. resistive.
systems use ARINC 573. The inputs to FDR DAU are Option C. inductive.
only analogue, discreet and ARINC 429. The Correct Answer is. inductive.
interface between SGUs, EADI and EHSI is only Explanation. NIL.
ARINC 429.

Question Number. 9. ARINC 629

Question Number. 5. An ARINC 429 bus databus is.
uses. Option A. one bus, bi-directional data flow.
Option A. a twisted shielded pair of wires.
Option B. two bi-directional twin sheathed Option B. two buses, unidirectional.
and earthed wires. Option C. two buses, bi-directional data
Option C. a single twin wire cable for each flow.
transmitter. Correct Answer is. one bus, bi-directional
Correct Answer is. a twisted shielded pair of data flow.
wires. Explanation. NIL.
Page

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Question Number. 10. Normal Question Number. 14. ARINC 629

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transmission order of ARINC 629 LRUs in periodic periodic mode is used for.
mode is in order of. Option A. transferring data only on events
Option A. shortest to largest TI. important to aircraft operation.
Option B. shortest to largest TG. Option B. database loads.
Option C. power up. Option C. normal operation.
Correct Answer is. power up. Correct Answer is. normal operation.
Explanation. B777 MM 23-91-00 pg 41. Shortest Explanation. NIL.
to longest terminal gap is for aperiodic mode only.

Question Number. 15. How is data

Question Number. 11. In an ARINC 429 coupled to an ARINC 629 data bus?.
wordstring, bits 1 to 8 represent the. Option A. By a resistive pickup.
Option A. destination LRU address. Option B. By an inductive pickup.
Option B. monitored parameter. Option C. By a capacitive pickup.
Option C. message. Correct Answer is. By an inductive pickup.
Correct Answer is. monitored parameter. Explanation. NIL.
Explanation. Aircraft Instruments and
Integrated Systems Pallett Page 159 and ARINCs
tutorial. Question Number. 16. How does MIL-
STD-1533 put data onto the databus?.
Option A. Through the bus controller.
Question Number. 12. ARINC 629 Option B. R1 (remote terminal).
terminal transmit interval is. Option C. SSIFU (sub-system interface unit).
Option A. common to each terminal.
Option B. unique to each terminal. Correct Answer is. Through the bus
Option C. when all terminals are quiet. controller.
Correct Answer is. common to each terminal. Explanation. Through the bus controller.

Explanation. The ARINC 629 TI is common to all

LRUs. Question Number. 17. The parity bit in
digital information is used.
Option A. to check the validity of data
Question Number. 13. MIL-STD-1533 is a information.
data bus for. Option B. for BITE programs.
Option A. Inertial Reference System. Option C. to check the status of the system.
Option B. Flight Data Recorders.
Option C. Digital Information Transfer Correct Answer is. to check the validity of
System. data information.
Correct Answer is. Digital Information Explanation. NIL.
Transfer System.
Explanation. NIL.
Page

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Question Number. 18. ARINC 429 SDI Option B. is when all transmissions are quiet.
word format is at bits.
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Option A. 32. Option C. unique to each terminal.

Option B. 1-8. Correct Answer is. common to each terminal.
Option C. 9-10.
Correct Answer is. 9-10. Explanation. NIL.
Explanation. SDI = Source Destination Ident.

Question Number. 23. An ARINC 429 bus

Question Number. 19. What is the parity uses.
bit for on an ARINC 429 bus?. Option A. a twisted shielded pair of wires.
Option A. To act as a terminal gap in an Option B. a single twin cable for each
emergency. transmitter.
Option B. To delay the signal. Option C. two bi-directional twin, sheathed
Option C. To check for corruption during and earthed wires.
transmission of a word. Correct Answer is. a twisted shielded pair of
Correct Answer is. To check for corruption wires.
during transmission of a word. Explanation. NIL.
Explanation. NIL.

Question Number. 24. ARINC 429 data

Question Number. 20. An ARINC 429 bus systems uses.
word label format is. Option A. hexadecimal numbering.
Option A. hexadecimal. Option B. binary coded decimal.
Option B. octal. Option C. decimal numbering.
Option C. binary. Correct Answer is. binary coded decimal.
Correct Answer is. octal. Explanation. NIL.
Explanation. NIL.

Question Number. 25. An ARINC 429

Question Number. 21. How many LRUs Binary Coded Decimal word occupies word bits.
can be connected to an ARINC 429 data bus?.
Option A. 1-8.
Option A. 120. Option B. 11-29.
Option B. 60. Option C. 11-28.
Option C. 20. Correct Answer is. 11-29.
Correct Answer is. 20. Explanation. Two versions of ARINC 429. BCD
Explanation. NIL. uses 11 - 29, Binary uses 11 - 28.

Question Number. 22. ARINC 629 Question Number. 26. An ARINC 429
terminal transmit interval is. system uses a.
Option A. common to each terminal. Option A. 20 bit word over a bi-directional
Page

bus.

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Option B. 32 bit word over a twisted pair of Option A. Source isolated.

wires. Option B. Via ARINC 629.
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Option C. 16 bit word over a twisted pair of Option C. Via ARINC 573.
wires. Correct Answer is. Via ARINC 573.
Correct Answer is. 32 bit word over a twisted Explanation. NIL.
pair of wires.
Explanation. NIL.
Question Number. 31. What system uses
base 8?.
Question Number. 27. An ARINC 629 Option A. ARINC 429, in dataword labels
characteristic is. only.
Option A. all LRUs can transmit and receive Option B. ARINC 573.
at the same time. Option C. ARINC 629.
Option B. data can transmit in both Correct Answer is. ARINC 429, in dataword
directions down the data bus. labels only.
Option C. all LRUs can transmit at the same Explanation. NIL.
time.
Correct Answer is. data can transmit in both
directions down the data bus. Question Number. 32. On an ARINC 629
Explanation. NIL. data bus, the maximum amount of current-mode
couplers per data bus is.
Option A. 46.
Question Number. 28. What limits the Option B. 120.
number of ARINC 429 receivers on a bus?. Option C. 64.
Correct Answer is. 120.
Option A. The speed and size. Explanation. 120 LRUs maximum (but the B777
Option B. The weight. uses 46).
Option C. The parallel input impedance.
Correct Answer is. The parallel input
impedance. Question Number. 33. To connect an LRU
Explanation. NIL. to the data bus.
Option A. a terminal controller and interface
module only is required.
Question Number. 29. Data is transferred Option B. current mode coupler, terminal
on the MIL-STD-1553B by. controller and a production break is required.
Option A. non return to zero. Option C. a current mode coupler, serial
Option B. Manchester bi-phase. interface module and terminal controller is
Option C. bi-polar return to zero. required.
Correct Answer is. Manchester bi-phase. Correct Answer is. a current mode coupler,
Explanation. NIL. serial interface module and terminal controller is
required.
Explanation. NIL.
Question Number. 30. How are engine
Page

indications sent to the FDR?.

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Question Number. 34. A current-mode Option C. connects bi-directional data

coupler contains an E-Core assembly. The purpose between two LRUs.
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of the E-Core is to provide effective screening of Correct Answer is. connects bi-directional
the signal through the. data between the LRU and current mode coupler.
Option A. current-mode coupler.
Option B. couple the signal to the data bus. Explanation. NIL.

Option C. enable easy access for monitoring

of the signal. Question Number. 38. Care must be
Correct Answer is. couple the signal to the taken when installing ARINC 629 cables into bus
data bus. panels, damage to cables can cause.
Explanation. NIL. Option A. corrosion of the conductor.
Option B. arcing of high voltage signals.
Option C. standing waves.
Question Number. 35. The ARINC 429 low Correct Answer is. corrosion of the
rate of transmission is. conductor.
Option A. 100 kbits/second with high of 12- Explanation. NIL.
14 Mbits/second.
Option B. 12-14 Kbits/second with high of
100 kBits/second. Question Number. 39. An aircraft
Option C. 12-14 Mbits/second with high of databus system.
100 Mbits/secon. Option A. can use both ARINC 629 and ARINC
Correct Answer is. 12-14 Kbits/second with 429 as they are compatible.
high of 100 kBits/second. Option B. can use both systems, ARINC 629
Explanation. NIL. and ARINC 429 via system card files and signal
gateways.
Option C. cannot use both ARINC 629 and
Question Number. 36. An ARINC 629 bus ARINC 429 data buses.
cable is a twisted pair of wires with. Correct Answer is. can use both systems,
Option A. a 130 ohm resistor at one end. ARINC 629 and ARINC 429 via system card files and
Option B. a 130 ohm resistor at both ends. signal gateways.
Explanation. NIL.
Option C. a 230 ohm resistor at one end.
Correct Answer is. a 130 ohm resistor at both
ends. Question Number. 40. ARINC 629 is used
Explanation. NIL. for.
Option A. emergency only.
Option B. a backup to ARINC 429.
Question Number. 37. An ARINC 629 stub Option C. normal flight.
cable. Correct Answer is. normal flight.
Option A. connects single directional data Explanation. NIL.
between the LRU and current mode coupler.
Option B. connects bi-directional data
Page

between the LRU and current mode coupler.

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Question Number. 41. Once an ARINC Question Number. 45. Fibreoptic databus
629 LRU has transmitted a message it will wait links are.
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how long before transmitting again?. Option A. simplex.

Option A. Until the end of the Option B. bi-directional.
synchronization gap. Option C. one way data buses.
Option B. Until the start of the terminal gap. Correct Answer is. bi-directional.
Explanation. NIL.
Option C. Until the end of the transmit
interval
Correct Answer is. Until the end of the Question Number. 46. ARINC 629 is.
transmit interval.
Explanation. NIL. Option A. half duplex.
Option B. full duplex.
Option C. simplex.
Question Number. 42. How is the word Correct Answer is. half duplex.
label 206 written in ARINC 429?. Explanation. NIL.
Option A. Decimal 206.
Option B. Octal 01100001.
Option C. Binary 11000110. Question Number. 47. A signal in an
Correct Answer is. Octal 01100001. ARINC 629 system uses.
Explanation. Label is Octal - MSB to right - so Option A. a pair of wires per transmitter unit.
yes, it is backwards.
Option B. a single wire.
Option C. a twisted pair of wires or fibre
Question Number. 43. What is ARINC 561 optics.
used for?. Correct Answer is. a twisted pair of wires or
Option A. Fly by Wire systems. fibre optics.
Option B. Flight Data Recorder systems. Explanation. Aircraft Electricity and Electronics
Option C. Inertial Navigation Systems. Eismin 5th Edition Page 148.
Correct Answer is. Inertial Navigation http://www.condoreng.com ARINC 429
Systems. tutorial
Explanation. NIL.

Question Number. 48. An in-series ARINC

Question Number. 44. An ARINC data 429 system transmits using.
word is bits 11-29, if bits 11-18 are patched which Option A. encoder.
of the following would be the LSB bit?. Option B. time division multiplexing.
Option A. 19. Option C. wave division multiplexing.
Option B. 29. Correct Answer is. time division multiplexing.
Option C. 21.
Correct Answer is. 19. Explanation. NIL.
Explanation. NIL.
Page

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Question Number. 49. A terminal Question Number. 53. The ARINC 429
controller. system uses which of the following system to
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Option A. is repetitive transmitting. transfer data?.

Option B. will transmit only once during each Option A. Non return to zero.
transmit interval. Option B. Harvard bi phase.
Option C. transmits only when addressed. Option C. Bi-directional return to zero.
Correct Answer is. will transmit only once Correct Answer is. Bi-directional return to
during each transmit. zero.
Explanation. NIL. Explanation.
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Question Number. 50. The number of
LRUs which transmit/receive on ARINC-429 is
dependent upon. Question Number. 54. Which of the
Option A. speed of transmission & size of following ARINCs is bidirectional?.
aircraft systems. Option A. 629.
Option B. parallel input impedance. Option B. 429.
Option C. size of S.D.I. Option C. 573.
Correct Answer is. parallel input impedance. Correct Answer is. 629.
Explanation. Aircraft Electricity and Electronics
Explanation. NIL. Eismin 5th Edition Page 148.
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Question Number. 51. One of the ARINC
429 formats is.
Option A. BCD. Question Number. 55. Data is transferred
Option B. octal. on the MIL-STD-1553B by using.
Option C. hexadecimal. Option A. non return to zero.
Correct Answer is. BCD. Option B. Manchester bi-phase.
Explanation. Option C. bipolar return to zero.
http://www.condoreng.com ARINC 429 Correct Answer is. Manchester bi-phase.
tutorial Explanation.
http://www.condoreng.com MIL-STD-1553
tutorial
Question Number. 52. A group of bits
transmitted at the same time is.
Option A. parallel data. Question Number. 56. The general
Option B. a clock signal. arrangement of ARINC 629 includes.
Option C. serial data. Option A. databus cable, current mode
Correct Answer is. parallel data. coupler, stub cable.
Explanation. NIL. Option B. current mode coupler, databus
cable only.
Option C. databus cable, stub cable, voltage
Page

mode coupler.

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Correct Answer is. databus cable, current

mode coupler, stub cable.
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Explanation. NIL. Question Number. 61. A simplex system

has.
Option A. 1 transmitter and multiple
Question Number. 57. ARINC 629 receivers.
Databus cables are terminated using. Option B. 1 bus controller and 1 remote
Option A. 100 ohms resistor. terminal.
Option B. 130 ohms resistor. Option C. 1 bus controller and multiple
Option C. 25 ohms resistor. receivers.
Correct Answer is. 130 ohms resistor. Correct Answer is. 1 transmitter and multiple
Explanation. NIL. receivers.
Explanation. NIL.

Question Number. 58. In ARINC 429 data

field is bits 11 to 28. If the bits 11 to 18 had pad Question Number. 62. To create a bi-
bits, the L.S.B. Of the data would be. directional communications link within an ARINC
Option A. bit 11. 429 system.
Option B. bit 28. Option A. four databuses are required.
Option C. bit 19. Option B. only one databus is required.
Correct Answer is. bit 19. Option C. two databuses are required.
Explanation. NIL. Correct Answer is. two databuses are
required.
Explanation. NIL.
Question Number. 59. The BCD data field
of ARINC 429 is contained within bits.
Option A. 11-29. Question Number. 63. Why does an
Option B. 11-28. ARINC databus system send data to LRUs in
Option C. 1-8. series?.
Correct Answer is. 11-29. Option A. Saves weight.
Explanation. Binary Word is 11 - 28. BCD Word Option B. More information can be sent.
is 11 - 29. Option C. Takes less time.
Correct Answer is. Saves weight.
Explanation. Aircraft Electricity and Electronics
Question Number. 60. ARINC 629 is Eismin 5th Edition Page 146.
transmitted using.
Option A. single wire for each transmitter.
Option B. fibre optics or twisted pair of Question Number. 64. Can an LRU
wires. transmit and receive on more than one 629 bus?.
Option C. SWG 28 wire.
Correct Answer is. fibre optics or twisted pair Option A. Yes.
of wires. Option B. Only if paralleled.
Explanation. Aircraft Electricity and Electronics Option C. No.
Page

Eismin 5th Edition Page 148. Correct Answer is. Yes.

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Explanation. NIL. Correct Answer is. 00001011.

Explanation. Octal 320 converted to binary, and
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reversed.
Question Number. 65. ARINC 629 LRUs
transmit.
Option A. when addressed. Question Number. 69. In ARINC 629
Option B. when signal gap is sensed. aperiodic mode, LRUs transmit in order of.
Option C. when terminal gap is sensed.
Correct Answer is. when terminal gap is Option A. longest terminal gap to shortest
sensed. terminal gap.
Explanation. Aircraft Electricity and Electronics Option B. power up.
Eismin 5th Edition Page 149. Option C. shortest terminal gap to longest
terminal gap.
Correct Answer is. shortest terminal gap to
Question Number. 66. An ARINC 429 BCD longest terminal gap.
word occupies bits 11-29, if 11-15 are filled with Explanation. NIL.
padders then the LSB of the word will be.

Option A. 11. Question Number. 70. ARINC 629,

Option B. 16. aperiodic mode is used.
Option C. 29. Option A. for landing and approach
Correct Answer is. 16. operation.
Explanation. Aircraft Electricity and Electronics, Option B. for normal operation.
Eismin Page 147. Option C. for database loads.
Correct Answer is. for database loads.
Explanation. B777 MM 23-91-00 pg 41. Periodic
Question Number. 67. A simplex system mode is for normal operation. Aperiodic mode is
has. for non-normal operation and large information
Option A. one transmitter, many receivers. transfer such as database loads and operating
software loads.
Option B. a bus controller and separate
controller.
Option C. one transmitter, one receiver. Question Number. 71. How is ARINC 429
Correct Answer is. one transmitter, many bi-directional data transfer achieved?.
receivers. Option A. Via a current mode coupler.
Explanation. NIL. Option B. Using two data buses.
Option C. Via a twisted pair of shielded
cables.
Question Number. 68. In an Arinc 429 Correct Answer is. Using two data buses.
Word label-representing heading is 320, this is Explanation. NIL.
represented in bits 1- 8 as.
Option A. 01011001.
Option B. 00001011.
Page

Option C. 01101000.

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Question Number. 72. The data format Option C. can be changed by adjusting the
use to transmit signal to flight data recorder. rx/tx software.
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Correct Answer is. can be changed by

Option A. Harvard bi-phase 12 bit. adjusting the rx/tx software.
Option B. Bi-Polar RZ 12 bit. Explanation. Aircraft Electricity and Electronics,
Option C. Manchester 2 bi-phase 12 bit. Eismin 5th Ed, pg149.
Correct Answer is. Harvard bi-phase 12 bit.
Explanation. NIL.
Question Number. 77. How does ARINC
629 bus transmit and receive information?.
Question Number. 73. The output voltage
of ARINC 429 signal is. Option A. Sockets and pins.
Option A. +5v. Option B. Inductive coupling.
Option B. +10v to -10v. H73. Option C. Optical coupling.
Option C. -5v. Correct Answer is. Inductive coupling.
Correct Answer is. +10v to -10v. H73. Explanation. NIL.
Explanation. NIL.

Question Number. 78. What is ARINC 561

Question Number. 74. An ARINC 629 used for?.
label word is. Option A. To specify LRU pin-outs.
Option A. 10 bits. Option B. To specify Radio Comms data bus.
Option B. 12 bits.
Option C. 8 bits. Option C. To specify Flight Data Recorder
Correct Answer is. 12 bits. data bus.
Explanation. 12-bit label field, 4-bit label Correct Answer is. To specify Radio Comms
extension, single parity, 3-bit time hi-lo synch data bus.
pulse. 20 bit in total. Explanation. NIL.

Question Number. 75. The T/R of ARINC Question Number. 79. What is the
629 is. purpose of the parity bit on an ARINC 429 bus?.
Option A. Encoder / decoder.
Option B. Multiplex / demultiplex. Option A. To indicate if the data is analogue.
Option C. switching.
Correct Answer is. Multiplex / demultiplex. Option B. To indicate that the data is digital.
Explanation. NIL.
Option C. To indicate to the receiver that the
data is valid.
Question Number. 76. Terminal gap in Correct Answer is. To indicate to the receiver
ARINC 629 is. that the data is valid.
Option A. always the same period. Explanation. NIL.
Option B. flexible.
Page

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Question Number. 80. ARINC 429 is. Correct Answer is. Three.
Explanation. NIL.
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Option A. Single Source Multiple Sink

System.
Option B. Multiple Source Multiple Sink Question Number. 84. In the ARINC 429
system. digital information transfer system, data may
Option C. Single Source Single Sink system. travel in:.
Option A. both directions on the same bus
Correct Answer is. Single Source Multiple Sink simultaneously.
System. Option B. one direction only.
Explanation. NIL. Option C. both directions on the same bus
sequentially by time multiplexing.
Correct Answer is. one direction only.
Question Number. 81. What is the Explanation. NIL.
purpose of intermediate production breaks in
ARINC 429 or 629 Data cables?.
Option A. Cables are only manufactured 40 Question Number. 85. An ARINC 629 data
feet long. word.
Option B. To allow maintenance personnel Option A. includes an 8 bit label and a 16 bit
to divide the right and left system buses into two data field.
parts for easy removal and installation. Option B. has only 20 bits.
Option C. To allow connection of new cables Option C. comprises up to 256 data bits.
to the existing ones in case of a modification. Correct Answer is. has only 20 bits.
Correct Answer is. To allow maintenance Explanation. NIL.
personnel to divide the right and left system buses
into two parts for easy removal and installation.
Explanation. NIL. Question Number. 86. In an ARINC 429
digital word bit number 32 is used for.
Option A. terminating the data field.
Question Number. 82. Where is the Option B. checking parity.
parity bit installed in a data word?. Option C. identifying word type.
Option A. Front. Correct Answer is. checking parity.
Option B. End MSB. Explanation. NIL.
Option C. Middle.
Correct Answer is. End MSB.
Explanation. NIL. Question Number. 87. What connects an
LRU to the Bus Coupler in an ARINC 629 Data Bus?.

Question Number. 83. RZ bi-polar Option A. Patch Cord.

modulation consists of bits which are one of Option B. Stub Cable.
__________ states?. Option C. Interconnect Cable.
Option A. Eight. Correct Answer is. Stub Cable.
Option B. Two. Explanation. NIL.
Page

Option C. Three.

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