module 5 questions

MODULE 05 PRACTICE MCQ PART 01

An # represents the correct answer

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

2. EADI sky and ground display is provided by

a) synthetic TV signals

# b) raster scan

c) stroke pulse

3. HSI heading is valid if the heading flag is

a) in view

b) green

# c) out of view

4. A NOR gate with both inputs inverted becomes a

a) NAND gate

# b) AND gate

c) OR gate


5. An ARINC 429 binary coded decimal data word occupies bits

a) 11 to 28

# b) 11 to 29

c) 1 to 8

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

7. The command bars on an ADI relate to

# a) path required

b) path being followed

c) roll indications

8. The recording medium in an FDR is

a) a high density floppy disc

# b) plastic tape coated with ferrite

c) copper foil coated with ferrite


9. Convert 0111012 to octal

a) 25

b) 33

# c) 35

10. What does the CADC feed

a) Altimeter / FMS / secondary radar

b) standby altimeter / machmeter

# c) cabin pressure controller sensor / machmeter / altimeter

11. ARINC 629 databus is

a) one cable, bi-directional

# b) two cables, bi directional

c) two cables, uni-directional

12. Requirements for software control can be found in

# a) AWN 45

b) JAR OPS

c) JAR AWO


13. Software can be modified by

a) licensed avionics engineers

b) the manufacturer

# c) The same rules apply as to modifications to hardware

14. Two connected fibre optic cable ends are parallel but not quite touching. This is called

a) lens connector

# b) end to end coupling

c) end fire coupling

15. 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

16. 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


17. What kind of light is used in a fibre optic systems?

# a) Infrared

b) Visible

c) Ultraviolet

18. Typical displays on an EHSI are

# a) VOR, Map, Plan and weather radar

b) VOR, Plan, Map and Attitude

c) Engine indications

19. 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

20. 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


21. 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

22. Adding invertors to the two inputs of an AND gate makes a

a) NAND gate

b) OR gate

# c) NOR gate

23. 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

24. CRT horizontal beam control is achieved by a

a) square wave

# b) sawtooth wave

c) sinusoidal wave


25. The ARINC 429 data bus word systems use

a) decimal numbering

b) hexadecimal numbering

# c) binary coded decimal

26. The binary number 11010111 expressed as a decimal is

a) 207

b) 223

# c) 215

27. The octal number 1001 expressed as a decimal is

a) 65

# b) 513

c) 9

28. This truth table is for a

C B A

0 0 0

0 0 1

0 1 0

1 1 1

a) NAND gate

# b) AND gate

c) OR gate


29. The inputs and outputs of a CADC are

a) pitot and static in; altitude, attitude, IAS and VS out

# b) pitot and static in; altitude, IAS, mach and VS out

c) pitot in; static, altitude, mach, IAS and VS out

30. EICAS provides the following

a) engine parameters only

# b) engine parameters and system warnings only

c) engine parameters and engine warnings only

31. 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

32. Engine parameters are displayed on

# a) ECAM

b) EHSI

c) FMSCDU


33. 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

34. ARINC 573 is related to what system

a) INS

# b) FDR

c) Weather Radar

35. The rising runway is positioned from information derived from

a) barometric height

b) vertical speed

# c) radio altimeter

36. Where are the Digital Flight Data Recorder outputs supplied to?

a) The recording unit

b) Flight instruments

# c) There are no outputs


37. FMS failure and warnings are

# a) displayed on EICAS

b) engine warnings only

c) EFIS warnings only

38. Who is responsible for the operational program of the FMS?

# a) The pilot

b) The engineer

c) The manufacturer

39. Flight director command bars are moved to the correct position by

# a) position feedback

b) amplifier gain

c) calibration

40. If a signal has quantity in volts and physical position it is

a) digital

b) synchronous

# c) analogue


41. 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

c) Horizontal

42. What is the fixed feature of an ADI?

a) The glideslope pointer

b) The lateral deviation bar

# c) The aircraft symbol

43. Primary colours of a CRT are

# a) red, green and blue

b) red, green and yellow

c) red, blue and yellow

44. 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


45. IRS accelerometers are mounted

a) 60o to each other

b) 45o to each other

# c) 90o to each other

46. An FMS navigation database is updated

a) at the operators request

b) once a month

# c) every 28 days

47. 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

48. 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


49. Fly-by-wire roll control is achieved by

a) ailerons

b) spoilers

# c) spoilers and ailerons

50. 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

51. ARINC 629 current mode couplers are

a) capacitive

b) resistive

# c) inductive

52. 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


53. What instrument includes a display of a rising runway?

# a) EADI

b) EHSI

c) ECAM

54. 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

55. ARINC 629 data bus is

a) two buses, unidirectional

b) two buses, bi-directional data flow

# c) one bus, bi-directional data flow

56. 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


57. 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

58. 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

59. EADI sky and ground display is provided by

a) synthetic TV signals

# b) raster scan

c) stroke pulse

60. 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


61. What frequency creates the raster effect on a CRT?

# a) 50/60 Hz

b) 400 Hz

c) 250Hz

62. 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

63. The sweep waveform used on a electromagnetic CRT is

# a) trapezoidal

b) sinusoidal

c) sawtooth

64. FMS operational program is updated every

a) 7 days

# b) 28 days

c) 90 days


65. 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

66. What is 345 in binary?

a) 100111001

b) 110011001

# c) 101011001

67. Which logic gate can be represented as a parallel circuit?

# a) OR gate

b) Exclusive OR gate

c) NAND gate

68. Software documentation procedures are laid down in

# a) AWN 45

b) JAA Ops

c) MOE


69. 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

70. In an ARINC 429 wordstring, bits 1 to 8 represent the

a) source of message

# b) monitored parameter

c) destination LRU address

71. ARINC 629 terminal transmit interval is

a) unique to each terminal

# b) common to each terminal

c) when all terminals are quiet

72. 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


73. 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

74. 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

75. Magnetic deflection on a CRT is achieved by a

a) sawtooth waveform

# b) trapezoidal waveform

c) sinusoidal waveform

76. 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


77. MIL-ST-1533 is a data bus for

a) Flight Data Recorders

b) Inertial Reference System

# c) Digital Information Transfer System

78. 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

79. Parallel to series conversion is achieved by

a) a parallel to series converter

# b) a shift register

c) a multiplexer / demultiplexer

80. 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


81. 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

82. 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

83. 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

84. within a computer controlled flight system, position feedback is converted from

# a) analogue to digital

b) digital to analogue

c) position feedback to rate feedback


85. What shape does the waveform take to counter the impedence effect of the coils in an

electromagnetic controlled CRT?

# a) Trapezoid

b) Sawtooth

c) Rectangular

86. What warnings can an FMS provide?

# a) Discrete warnings

b) Spurious faults

c) Ground faults only.

87. 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

88. 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


89. 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

90. The third EFIS Symbol Generator is operated

a) with EICAS

b) in an emergency

# c) as a standby to the No1 and No2 system

91. What functions are available on the EHSI?

a) Full arc and Wx only

# b) Full arc, Wx and Map Mode

c) Full Arc only

92. EFIS displays of the right hand and left hand displays are compared by comparators in

the

a) FMS

b) EICAS

# c) Symbol Generators


93. What is the approximate earth rate?

a) 5o/hour

b) 10o/hour

# c) 15o/hour

94. An IRS platform has

a) two accelerometers

# b) three accelerometers

c) two or three accelerometers depending on the system

95. IRS Laser Ring Gyros provide

# a) rate movement about an axis

b) displacement about an axis

c) both rate and displacement about an axis

96. 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


97. ARINC 629 periodic mode is used for

# a) normal operation

b) transferring data only on events important to aircraft operation

c) database loads

98. 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

99. Light travels along a fibre optic by

# a) reflection

b) refraction

c) dispersion

100. 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.


101. How is data coupled to an ARINC data bus?

a) By a capacitive pickup

# b) By an inductive pickup

c) By a resistive pickup

102. An AND gate output is 1 when inputs are

a) both 0

b) 1 and 0

# c) both 1

103. What is hex 110 in decimal

# a) 272

b) 282

c) 32

104. Convert the binary word 1100 to decimal

a) 16

# b) 12

c) 11


105. 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)

106. If a data message is made up of 1 and 0 it is

a) analogue

# b) digital

c) logic

107. Convert the binary word 1110 to decimal

a) 12

# b) 14

c) 15

108. What sort of gate requires two positive voltages to operate

a) NOT

b) OR

# c) AND


109. 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

110. When 4 binary serial counters are connected in cascade for frequency division, what

division factor is required

a) 4

b) 8

# c) 16

111. Magnetic deflection in a CRT is achieved by

a) a sawtooth waveform

# b) a trapezoidal waveform

c) a sinusoidal voltage

112. 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


113. 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

114. on a Fly by Wire system, what controls the stab trim

a) ELAC

# b) ELAC and SEC

c) SEC

115. 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

116. ARINC 429 SDI word format is at bits

a) 1 - 8

# b) 9 - 10

c) 32


117. Convert the binary number 110010 to decimal

a) 80

# b) 50

c) 34

118. What is serial to parallel and vice-versa called

a) Encoder/Decoder

# b) Multiplex/Demultiplex

c) Switching

119. 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

120. 3 binary counters in cascade. What is the division?

# a) 8

b) 16

c) 32


121. Control of software is by

# a) the National Aviation Authority

b) engineers

c) the aircraft manufacturers

122. A typical fibre optic connector is

a) F-type connector

# b) coupling type, with lens fitted

c) push-pull connector

123. An ARINC 429 word label format is

a) binary

# b) octal

c) hexadecimal

124. Which of the following is an optelectronic device?

a) Triac

b) Thyristor

# c) Laser Diode


125. 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

126. How many LRUs can be connected to an ARINC 429 data bus

a) 120

# b) 20

c) 60

127. Convert the hexidecimal number D into decimal

# a) 13

b) 14

c) 15

128. Convert decimal 15 into binary

a) 1101

# b) 1111

c) 1110


129. Convert 448 to hex

a) 3616

# b) 2416

c) 2216

130. 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

131. How many LRUs can be connected to an ARINC 629 data bus

# a) 120

b) 20

c) 60

132. Convert decimal 15 into hexadecimal

a) E

b) G

# c) F


133. Which logic gate has this truth table A B C

C B A

0 0 0

1 1 0

1 0 1

0 1 1

a) NOT

# b) Exclusive OR

c) NAND

134. Which logic gate can be represented as a parallel circuit?

# a) OR

b) Exclusive OR

c) NAND

135. What is the definition of level one software?

# a) Critical

b) Essential

c) Non-essential

136. ESDS bags are sealed by

a) zip locks

b) ESDS labels

# c) twine (100% cotton)


137. What is 345 in binary?

# a) 101011001

b) 110011001

c) 100111001

138. 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

139. Convert 1D to binary

a) 29

# b) 11101

c) 101001

140. ARINC 629 terminal transmit interval is

a) unique to each terminal

# b) common to each terminal

c) is when all transmissions are quiet


141. Convert 2C hex to octal

# a) 54

b) 44

c) 35

142. A fibre optic light source is normally

a) a filament lamp

# b) a laser or LED

c) a strobe light

143. 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

144. 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


145. 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

146. ARINC Communications Addressing and Reporting Systems is used to

a) download aircraft status reports

# b) connect the aircraft to base

c) make telephone calls

147. ARINC 429 data bus systems uses

a) decimal numbering

b) hexadecimal numbering

# c) binary coded decimal

148. with radio coupled autopilot, what are the inputs

a) ADF and ILS

b) ADF and VOR

# c) ILS and VOR


149. 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"

150. 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

151. An ARINC 429 Binary Coded Decimal word occupies word bits

a) 11 - 28

# b) 11 - 29

c) 1 - 8

152. Engine parameters are displayed on

# a) ECAM

b) EHSI

c) CDU


153. 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

154. What systems does the ADC feed?

a) Altimeter / FMS / secondary radar

b) Standby altimeter/machmeter

# c) Cabin pressure controller sensor / machmeter / Altimeter

155. A hexadecimal is a number to base

a) 8

b) 2

# c) 16

156. 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


157. A thyristor is a device which has

a) a positive temperature coefficient

# b) a negative temperature coefficient

c) a temperature coefficient of zero

158. 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

b) less than 10 kilohms

c) less than 1 ohm

159. 1012 converted to decimal is

a) 52

# b) 510

c) 210

160. Physical variables in quantitative forms, such as voltage or angular rotation of a shaft

are

# a) analogue

b) digital

c) binary


161. Within a 3 bit frequency cascade, division is to

# a) 8

b) 4

c) 2

162. When is a radio altimeter active?

a) Up to 10,000 ft

# b) Up to 2,500 ft

c) Up to 100 ft

163. 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

164. The binary coded decimal number 10011000 expressed as a decimal number is

# a) 9810

b) 15210

c) 1522


165. The decimal number 7 expressed as a binary number is

# a) 1112

b) 72

c) 1012

166. Convert 011101 binary to octal

a) 25

b) 33

# c) 35

167. 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.

168. 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


169. in an ARINC 429 word string, bits 1 - 8 represent

a) the source of the message

# b) the monitored parameter

c) the destination LRU

170. What limits the number of ARINC 429 receivers on a bus

a) The speed and size

# b) The parallel input impedance

c) The weight

171. 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

172. 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


173. 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

174. A BYTE is usually

a) a 12 bit word

# b) an 8 bit word

c) a six bit word

175. Data is transferred on the MIL-STD-1553B by

a) bi-polar return to zero

# b) manchester bi-phase

c) non return to zero

176. The fibre optic cable can be identified on aircraft by its jacket colour which is

# a) purple

b) red

c) yellow


177. 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

178. The timebase in a CRT consists of

# a) an amplifier and an oscillator

b) an oscillator only

c) an amplifier only

179. HIRF protection of LRUs is provided by

# a) built in filters and overvoltage circuits

b) internally shielded cables

c) built in filters only

180. An EADI display of flight director commands are coloured

a) cyan

b) red

# c) magenta


181. Which systems does a modern ADC give information to?

# a) Flight control computer, Air Data Instrument, Engine systems

b) EFIS

c) EICAS

182. Binary Number: 110010

a) 80

# b) 50

c) 34

183. How are engine indications sent to the FDR?

# a) Via ARINC 573

b) Via ARINC 629

c) Source isolated


184. What is this truth table?

A.B B A

0 0 0

0 0 1

0 1 0

1 1 1

# a) AND gate

b) NOR gate

c) NOT gate

185. Where do the outputs from a DADC go?

a) EADI

b) EHSI

# c) IRMP: Inertial Reference Mode Panel

186. During an EFIS screen fit

a) use bonding strap

# b) dont touch terminals

c) no tooling is required


187. To stop earth loops forming, you would

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

188. How many satellite signals are required to achieve precise 3D positioning?

# a) 4

b) 5

c) 6

189. Binary addition of 1101 + 101101 is

# a) 58

b) 61

c) 70

190. What system uses base 8?

# a) ARINC 429, in dataword labels only

b) ARINC 629

c) ARINC 573


191. What maintenance problems are associated fibre optics?

a) Corrosion

b) Earthing faults

# c) Kinking and contamination of connectors

192. Who can sign for a software update?

# a) Design organization or the aircraft manufacturer

b) Engineer

c) Chief pilot

193. What sort of gate is this?

a) Or gate

# b) NOR gate

c) NOT gate

194. What creates the raster effect on a CRT?

# a) Sawtooth frequency

b) Sinusoidal frequency

c) Trapezoidal


195. Common fibre optic use is

a) modulating intensity on direct read

# b) modulating frequency on direct read

c) HIRF

196. 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

197. The binary number 11010111 is expressed as a decimal is:

# a) 215

b) 107

c) 53

198. The octal number 1001 expressed as a decimal is:

# a) 513

b) 613

c) 713


199. 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

200. 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

201. A fibre optic data bus

a) can only transmit 1 message at a time

# b) can transmit several messages simultaneously

c) is only used for non essential messages

202. The minimum requirement for an aeroplane CVR is

a) from power on

b) from engine start

# c) from beginning of take off roll


203. on an ARINC 629 data bus, the maximum amount of current-mode couplers per data bus

is

a) 46

# b) 120

c) 64

204. 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

205. A current-mode coupler contains an E-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

206. 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


207. 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 parallel with output

# b) An inverting op amp connected in parallel with output

c) A differentiator with a 100 Kilohm feedback resistor

208. 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

209. 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

210. The output of a NOT gate is logic 1. The input is

a) logic 1

# b) logic 0

c) both logic 1


211. 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

212. 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

213. 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

214. 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


215. An Inertial Navigation System (INS/IRS) computes distance from acceleration by

a) a simple integration

b) a differentiation followed by an integration

# c) two successive integrations

216. 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

217. 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

218. An A to D converter uses successive approximation to

a) increase resolution

# b) increase speed

c) increase accuracy


219. 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

220. 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

221. 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

222. An IRS system requires data for wind computation from

# a) central Air Data Computer

b) satellites

c) Doppler System


223. 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

224. 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

225. Pitch Control of a fly by wire system is achieved by

a) elevators only

# b) stabilizer and elevator

c) stabilizer only

226. 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


227. in memory using multivibrators, when power is switched off the data will

a) still be available on power up

# b) be lost

c) automatically be downloaded

228. 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

229. 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

230. What is the advantage of EPROM over fusible link?

a) Cheaper to produce

# b) Can be re-programmed

c) Does not need refreshing


231. 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

232. What must be entered into the IRS before the aircraft can be moved?

# a) Present position

b) Flight plan

c) Cruise height

233. 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

234. 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


235. 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

236. 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

237. The output of an AND gate having two inputs A and B is logic 1. The two inputs will

have the logic states of

a) A = 0, B = 0

# b) A = 1, B = 1

c) A = 1, B = 0

238. 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


239. What is 0111000012 in Octal?

a) 28110

b) 2258

# c) 3418

240. ARINC 629 is used for

# a) normal flight

b) emergency only

c) a backup to ARINC 429

241. 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

242. 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


243. 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

244. 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

245. 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

246. 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


247. 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

248. 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

249. 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

250. 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


251. 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

252. 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

253. LCD screens are driven by

# a) ac voltage

b) variable current dc voltage

c) fixed current dc voltage

254. 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


255. 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.

256. 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

257. A FMS has a total of how many Data Bases

a) 1

# b) 2

c) 4

258. Fly by wire High Speed protection is

a) to prevent high speed stall

b) to increase the pitch angle as speed increases

# c) to prevent tuck under


259. 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

260. A semiconductor which emits photons and releases electrons when stimulated by photons

is called

a) an LED

b) a photodiode

# c) a laser diode

261. An IRS Laser gyro provides

# a) detection of the rate of movement about an aircraft axis

b) detection of the earths rotation to establish true north

c) detection of the earths gravitational force to establish true north

262. 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


263. 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

264. 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

265. An encoder changes

a) analogue to digital

b) digital to analogue

# c) data from one format to another

266. An encoder using Grey code

# a) changes analogue to digital

b) changes analogue to binary

c) changes digital to analogue


267. What is the Low Speed transmission rate for ARINC 429?

# a) 12 14.5 kbits / second

b) 100 kbits / second

c) 120 kbits / second

268. What is this symbol:

a) Exclusive AND gate

# b) Exclusive OR gate

c) Exclusive NOR gate

269. What Logic Gate does this switch circuit indicate?

a) AND gate

# b) OR gate

c) NOR gate

270. What is the effect of a level 1 software failure?

a) Significant reduction in safety margins

b) Large reduction in safety margins

# c) Loss of aircraft and / or fatalities


271. Ribbon cables affected by mutual impedance and current loop leakage are protected by

a) earthing each conductor

# b) earthing each alternate conductor

c) wrapping the complete ribbon in an earthed shield

272. What is the definition of baud rate?

# a) 1 bit per second

b) 1 byte per second

c) 1 word per second

273. An RS flip-flop with Q at 1 is said to be

a) reset

# b) set

c) zero

276. The release of a photon by another photon is an example of

a) a zener diode

# b) an LED

c) a photo diode


277. When a JK flip flop is used as a memory device, what type of memory would it be

a) non-volatile

b) read-only

# c) volatile

278. Once an ARINC 629 LRU has transmitted a message it will wait how long before

transmitting again?

a) Until the end of the synchronization gap.

# b) Until the end of the transmit interval

c) Until the start of the terminal gap

279. How is the word label 206 written in ARINC 429?

a) Decimal 206

b) Binary 11000110

# c) Octal 01100001

280. What is ARINC 561 used for?

a) Flight Data Recorder systems

b) Fly by Wire systems

# c) Inertial Navigation Systems


281. What are the outputs from digital clocks used for?

a) VOR, ILS and DME

# b) Flight data acquisition unit, Flight management computer and Voice recorder

c) Weather radar, TCAS and ACARS

282. What does a fibre optic star connection do?

# a) Provides direct point-to-point services to units on dedicated lines emanating from the

central hub

b) Provides a continuous loop of fibre interconnecting all nodes

c) Shares a common bandwidth of a common cable

283. What is the purpose of the ALU?

a) To convert serial into parallel data

b) To store data being used by the CPU

# c) The part of the CPU unit where arithmetic & logic operations are carried out

284. Which logic gate has both inputs high to get an output?

a) NAND gate

b) OR gate

# c) AND gate


285. Which would have the least components?

# a) ALU

b) CPU

c) LSI

286. How many address lines would be needed for an 8 line MUX?

a) 4

# b) 3

c) 2

287. in a MUX, how is parallel converted to serial?

# a) By way of a shift register

b) By way of a demultiplexer

c) By way of an encoder

288. If a magnetic field is parallel to the X plates in a CRT, which way will the beam move?

a) Diagonally

b) Vertically

# c) Horizontally


289. What would you expect to see displayed on an EADI display?

# a) Flight director command bars, slip indicator, rate to altitude & autoland

b) Compass heading, selected heading and VOR

c) Course information, weather radar, way point alert and bearing pointers

290. The binary number 10101000111001012 in hexadecimal is:

a) 22BC16

# b) A8E516

c) FFFF16

1. A fibreoptic lens type coupling with lens and integral LED compared

to an end-fire coupling is

# a) more efficient

b)less efficient

c)equally efficient

2. An analogue to digital converter is as accurate as

# a) the sampling rate

b)the frequency

c) the amplitude


3. A digital to analogue converter that requires the output to range

between 0v and -10v would have

a) a non-inverting amplifier in parallel with the output line

# b)an inverting amplifier in series with the output line

c) a non-inverting amplifier in line with the output with a resistor

to ground

4. An LED display is

a) red and green

# b)monochrome only

c) high definition

5. An EFIS ADI display will show along with pitch and roll

a) flight director bars, autoland, compass rose, altitude

b)flight director bars, autoland, altitude, range to altitude, decision

height

# c) decision height, autoland, rad alt , altitude


6. A full operation system BITE check will

# a) carry out a internal system test that ensures the system meets

design requirements and is operational

b)as well as checking full system will move the controls to their stops

c) as well as checking full system will not move the controls to

their stops

7. If on a flight deck EFIS system all the displays were missing

one bit of information this is most likely to be

a) the symbol generator and display

# b)the input sensor bus and display controller

c) the display controller and symbol generator

8. A arinc data word is bits 11-29, if bits 11-18 are patched which of

the following would be the LSB bit

# a) 19

b)29

c) 21


9. What is a band?

a) A block of data

# b)A bit of data

c) A byte of data

10. Passive sensors in fibre optics

a) require power for the processing signal before they send them down

the fibre optic

b)require no power and they do not process signals

# c) process the signal but do not require power

1. An LCD display uses what type of power supply?

# a) Continuous AC

b)Variable level DC voltage

c) DC voltage

2. Fibre optic data bus links are

# a) bi-directional

b)one way data buses

c) simplex


3. 0011011000101001 when transferred to computer language this

information can be a representation of

a) binary, octal or decimal numbers

# b)hex, octal and binary numbers

c) hex, octal and decimal numbers

4. In a bi-stable memory circuit

# a) the memory is lost as soon as power is removed

b)the memory is retained indefinably

c) the memory needs to be refreshed constantly, even when power is on

5. In an analogue to digital converter, the input voltage

# a) stays on constantly

b)is switched by the digital input

c) is intermittent


6. In an RS flip flop output is one. This means it is

# a) set

b)reset

c) intermediate

7. ARINC 629 utilizes

# a) full duplex

b)half duplex

c) simplex

8. Optical fibre losses are due to

a) absorption only

# b)absorption, scattering and reflection

c) radiation, absorption and reflection

9. The cone of acceptance is measured between

# a) longitudinal axis of the core and the outer angle

b)the two outer angles

c) the diameter of the core


10. An R-2R Converter has values or resistance

a) whose precision are accurate

# b)whose relative precision are accurate

c) whose precision are not accurate

1. An ALU is an example of

# a) LSI

b)SSI

c) MSI

2. What does 1 represent in an analogue system?

# a) Switches closed, magnetised

b)Switches open, unmagnetised

c) High frequency


3. A centralised monitoring computer system is used

a) to test system during flight and for BITE test of systems on the

ground using a carry on control unit

# b)to test systems in flight and on the ground using a centralised on

board control unit

c) testing systems on the ground only

4. A signal in an ARINC 629 system uses

a) a pair of wires per transmitter unit

# b)a twisted pair of wires or fibre optics

c) a single wire

5. A beam deflection on EFIS displays are

# a) electromagnetism

b)electrostatic

c) solid state


6. A nand and nor to become a not gate have

# a) inputs connected together

b)inputs inverted

c) outputs inverted

7. An in-series ARINC 429 system transmits using

a) wave dividing multiplexing

# b)time dividing multiplexing

c) encoder

8. Fibre optic cables use

a) reflective outer shell

# b)refractive outer shell

c) reflective inner shell

9. A sinusoidal circular time constant produces what output?

# a) 90 degrees out of phase

b)180 degrees out of phase

c) In phase


10. A terminal controller

a) transmits only when addressed

b)is repetitive transmitting

# c) will transmit only once during each transmit interval

1. What is the advantage of series over parallel message sending?

a) Quicker

b)More information sent

# c) Only one pair of conductors

2. The number of LRUs which transmit/receive on ARINC-429 is dependent

upon

a) size of S.D.I

b)speed of transmission & size of aircraft systems

# c) parallel input impedance

3. In fibre optic cable, signals are separated by

# a) active optic filter

b)passive optic filter

c) low pass filter


4. In an EFIS display, the lines, Scales, Indicator and Synoptic are

generated by

a) synoptic scan

# b)stroke scan

c) raster scan

5. Speed of computer process information depends upon

a) the size of the programme

# b)the time period to access the memory

c) the external inputs to the system

6. A typical example of a mass storage memory device which "write once"

and "read many" is

# a) a CD Rom

b)an IC

c) a magnetic tape

7. When handling PCB's labelled ESDS, what precaution are taken?

# a) Isolate electrical power before installing on Aircraft

b)First earth with aircraft then to it

c) Do not touch its pins as copper contamination can occur


8. A computer consist of at least the C.P.U and

# a) memory and input & output port

b)register section, ALU, timing and control section

c) memory, ALU, input & output port

9. Electromagnetic compatibility is achieved by

# a) shielding, screening, earthing, bonding and interference filters

b)enclosing the system with same frequency and strength of which

screening is done

c) coating in a conductive paint

10. The supply to an LCD is

# a) AC

b)current restricted DC

c) voltage restricted DC

1. The method of producing (white) lines for aircraft symbols, V/S scale

etc. on an EADI is by

# a) stroke scan

b)raster scan

c) trapezoidal input


2. In modern aircraft, the output from the clock is used

a) to synchronise the signals on the control bus

# b)give GMT details to the flight recorder and other systems

c) to provide a clock pulse for CRT

3. Audio sounds recorded digitally

a) are not as accurate due to clipping and input errors

# b)are superior quality and "data preservation"

c) are narrow bandwidth

4. When carrying out HIRF maintenance on aircraft, the max resistance is

a) 1 milliohm

b)1 ohm

# c) 0.05 ohms

5. A computer message 3B4 is

a) binary

b)octal

# c) hexadecimal


6. One of the ARINC 429 formats is

a) hexadecimal

# b)BCD

c) octal

7. When does voice data recording commence?

# a) On engine start

b)From aircraft take off run

c) After take off when airborne

8. What is 54 octal in hexadecimal

# a) 2C

b)4F

c) 2F

9. A heading reference of 320 degrees in a word label format would be

written as

a) 101010001

# b)11010000

c) 01000111


10. Within an EFIS display system, all displays have 1 bit of

information missing. What would be the most probable cause?

a) Symbol generator and sensor input

# b)Display controller and sensor input bus

c) Display controller and symbol generator

1. A computer using RAM would utilise

a) a compact disc

# b)an integrated circuit (chip)

c) magnetic tape

2. With a j-k flip flop which is the output set

# a) q = 1

b)q = 0

c) either

3. If the glideslope pointer is below the centre mark the aircraft is

a) on the glideslope

b)below the glideslope

# c) above the glideslope


4. 2D in decimal is

# a) 45

b)43

c) 41

5. The operational data base of the FMS may have to be modified in

flight

a) by the pilot

b)automatically by the DADC

# c) It cannot be modified in flight

6. An LED will emit light when

# a) it is forward biased

b)it is reverse biased

c) either forward or reverse biased if a sufficient level of ac

voltage is applied

7. On an EFIS system the weather radar is displayed on

a) the EADI

# b)the EHSI

c) the FMC CDU


8. CADC outputs are

a) altitude, vertical speed, IAS, mach no

b)altitude ,vertical speed, angle of attack, TAT, SAT

# c) altitude, vertical speed, TAS, CAS, mach no, SAT, TAT

9. Data is converted from serial to parallel and parallel to serial by

a) a parallel register

# b)a shift register

c) a synchronous counter

10. A group of bits transmitted at the same time is

a) a clock signal

# b)parallel data

c) serial data

1. A typical characteristic of a CMOS is

# a) low power dissipation

b)high voltage handling

c) high power dissipation


2. If one EICAS CRT fails

# a) the remaining CRT will display primary EICAS data

b)the FMS CDU will display the failed CRT data

c) the standby CRT will automatically take over

3. 84 decimal in hexadecimal is

# a) 54

b)f4

c) 5f

4. EADI displays

# a) pitch and roll attitudes

b)heading and weather radar

c) pitch, roll and waypoints

5. On an EHSI in weather radar mode, a severe storm would be shown as

a) orange areas with black or yellow surrounds

# b)red areas with black surrounds

c) blue areas with white background


6. Variations in light on EFIS displays are compensated for by

# a) integrated light dependant resistors in the display compensating for

each display individual

b)An external light dependant resistor mounted on the flight deck

compensating for all displays in a parallel-parallel format

c) manual adjustment by flight crew on EFIS controller

7. The input bus into a central processor unit is a

# a) one way bus

b)bi directional bus

c) two way bus

8. A method used in modern aircraft for reporting in flight faults to an

engineering and monitoring ground station is

a) TCAS II

# b)ACARS

c) TAWS


9. A CRT display has the advantage over an LCD display by

a) brighter clearer output

b)more energy efficient

# c) large viewing angle

10. Most fibre optic connectors are designed so

a) the receptacle has to torque to a designated torque to ensure

correct alignment

# b)the connectors can not be over tightened

c) the connector can not be replaced on the aircraft

1. The self test function on an EFIS system can be tested

a) in the air only

# b)on the ground only

c) in the air and on the ground


2. Each of the symbol generator outputs in an EFIS system can be

# a) displayed of each individual display

b)only no. 2 can be displayed on the no.1

c) can not be interchanged

3. An AND gate with inverted inputs and an inverted output is equivalent

to

a) an AND gate

# b)an OR gate

c) a NOR gate

4. Logic gates internal operating mechanisms are produced from

a) thin film resistors

# b)transistors

c) diodes

5. To display a circle on a CRT you use

a) 2 sine waves 180 degrees out of phase

# b)2 sine waves 90 degrees out of phase

c) 2 square wave 90 degrees out of phase


6. The light source used in fibre optics is

# a) higher bandwidth than visible light

b)lower bandwidth than visible light

c) visible light

7. When the power is removed from a bi-stable memory device, it's

memory will

# a) be lost indefinitely

b)be saved indefinitely

c) downloaded to memory

8. BITE tests are inhibited for ground use during

a) take-off

b)gear retraction

# c) forward motion

9. Software changes come under the responsibility of

a) the national aviation authority

# b)the aircraft constructor

c) the engineer


10. A multiplexer

# a) takes many signals in and converts it to a serial transmission

output

b)takes one signal in and converts it to a parallel transmission output

c) takes many signals in and puts these in a parallel transmission on

the output

1. The CPU consists of

a) register and arithmetic logic unit only

# b)ALU, timing and control section, register

c) register, timing and control section only

2. The ARINC 429 system uses the following system to transfer data

a) non return to zero

b)harvard bi phase

# c) bi-directional return to zero


3. Which of the following ARINCs are bidirectional?

a) 429

# b)629

c) 573

4. Data is transferred on the MIL-STD-1553B by using

a) bipolar return to zero

# b)manchester bi-phase

c) non return to zero

5. The general arrangement of ARINC 629 includes

a) current mode coupler, data bus cable only

b)data bus cable, stub cable, voltage mode coupler

# c) data bus cable, current mode coupler, stub cable

6. To deflect the beam of a CRT horizontally, coils are placed on the

neck of the tube

a) one on the side, one at the bottom

b)each side

# c) top and bottom


7. During flight (non fault conditions) the EICAS system displays

on the lower CRT

# a) secondary engine parameters

b)synoptic display

c) flight phase page

8. Who can design new software?

# a) BCAR section A8 approved company

b)BCAR section A1 approved company

c) The CAA

9. Data bus cables are terminated using

# a) 130 ohms resistor

b)100 ohms resistor

c) 25 ohms resistor

10. Modern aircraft with electronic displays would display information

on airframe and engine on which system?

a) Flight management system

# b)Electronic centralised aircraft monitoring system (ECAM)

c) EADI


1. The Flight data recorder starts recording

a) after take off

b)on aircraft roll out from stand

# c) after the first engine has started

2. Data to flight data recorder can be taken form a communal data bus if

a) it goes directly to it

b)the power is within flight data recorder limits

# c) if source isolation has been considered

3. In arinc 429 data field is bits 11 to 28. If the bits 11 to 18 had

pad bits, the L.S.B. Of the data would be

# a) bit 19

b)bit 11

c) bit 28

4. The BCD data field of arinc 429 is contained within bits

a) 1- 8

# b)11- 29

c) 11- 28


5. After attaching a wrist strap to you wrist (which is connected to

aircraft ground), prior to removal of ESDS equipment, the resistance

measured

a) between the strap and the pin ground must be >10 Megohms

# b)between your skin and the pin ground must be


8. If the magnetic deflection plates produce a magnetic field which is

parallel to the horizontal then the trace is deflected in

a) horizontal axis

b)circular motion

# c) vertical axis

9. Light transmission in a fibre optic cable is due to

# a) repeated internal reflection

b)refraction of the light

c) defraction of the light

10. The name given to the joining of two fibre optic cables by aligning

them carefully and bringing them into close proximity of each other is

a) Fusion

# b)End to end

c) Lens Coupling

1. In a fibre optic cable

a) only one data signal can be sent down it at any one time

# b)multiple data signals can be sent down it at one time

c) data can only be sent in one direction


2. A logic 1 may be represented in an analogue system by

(where Q is an output of a latch / flip-flop)

a) switch open / light on / Q

b)switch closed / light off / Not Q

# c) positive / magnetised / Q

3. A central fault display system should be available through

a) a bite test

# b)a easily accessible multifunction control display unit

c) a central bite test box with clear LED indications

4. An analogue to digital converter where it counts up to binary state

equal to the analogue in put and then back down when this is reached is a

a) successive approximation counter

# b)a tracking ramp type converter

c) flash type converter

5. Transistors are used in a current triggered D to A device to

a) switch on the input

b)switch of the inputs

# c) change the state of the inputs


6. Radio altitude is displayed on a EFIS system

a) on the Electronic horizontal situation indicator

# b)on the electronic artificial direction indicator

c) on the RMI

7. A flight data recorder should be capable of recording

a) the last 25 hours

b)the last 25 hours of aircraft flight

# c) the last 25 hours with engines running

8. Op amps generally used in ADCs and DACs are normally

# a) high input impedance, low output impedance

b)high input impedance , high output impedance

c) low input impedance , how output impedance

9. Magnetic materials are used in

a) ROMs only

# b)some RAMs

c) EPROM


10. The pins on an op amp are numbered

a) clockwise

# b)anticlockwise

c) cross ways

1. A parallel register

# a) reads each bit to be stored simultaneously

b)requires a clock pulse for each bit

c) reads the stored data when logic 0 is applied to the read line

2. HIRF protection is in the order of

# a) hardened skin and protecting wires / LRUs

b)bonding as many parts of the aircraft as possible and a maximum

resistance of 0.05ohms

c) periodically turn off components whilst radio transmitting

3. 16 hexadecimal converted to decimal is equivalent to

a) 38

b)48

# c) 22


4. To get logic 1 using this gate

a) A or B = 1

b)A and B = 1

# c) A and B = 0

6. Decimal 10 converted to binary is

a) 1111

b)1001

# c) 1010

7. What systems uses base 10?

# a) Decimal

b)Digital

c) Octal

8. What systems use base 16?

a) Octal

b)BCD

# c) Hexadecimal


9. EADI pointers, dials and engine data is produced using

# a) stroke

b)raster

c) electromagnetic waves

10. Fibre optic cables consists of a silica glass core and

# a) refractive outer cladding

b)reflective outer cladding

c) reflective inner cladding

1. The waveform to the coil of a CRT is

# a) trapezoidal

b)ramp

c) analogue

2. Analogue logic 1 is

a) closed switch, Logic Q=0

# b)closed circuit, Logic Q=1

c) open circuit


3. ARINC 629 is transmitted using

# a) fibre optics or twisted pair of wires

b)single wire for each transmitter

c) SWG 28 wire

4. BITE for ground use only is switched off

a) when breaks are released

b)when undercarriage up

# c) on take-off

5. Fibre optics relies on

a) fibre absorbing light

# b)light reflecting off cladding

c) light escaping cladding

6. The "light" emitted from a LED used within a fibre-optic system will

have a wavelength

# a) slightly longer then that of visible light

b)slightly shorter then that of visible light

c) equal to that of visible light


7. Binary coded decimal (BCD) format has a minimum of

# a) four "0s" or "1s"

b)2 lots of four "0s" or "1s"

c) 3 lots of four "0s" or "1s"

8. A simplex system has

# a) 1 transmitter and multiple receivers

b)1 bus controller and 1 remote terminal

c) 1 bus controller and multiple receivers

9. Fibre optic cable over copper cable has the following advantages

a) non-conductive, easier to manufacture and assemble, greater

bandwidth

# b)non-conductive, greater bandwidth, greater signal security

c) greater bandwidth, greater signal security, more robust

10. A EFIS system ADI displays pitch, roll

a) autoland, altitude, compass rose and flight director bars

b)autoland, decision height, range to altitude and flight director bars

and slip indicator

# c) autoland, rad alt, decision height and slip indicator


1. What is the Hexadecimal number F86 in Binary?

# a) 111110000110

b)111110000001

c) 3974

2. What is 11000012 - 1011002?

a) 1101112

b)100011012

# c) 1101012

3. During normal functioning of an ECAM system the engine data shown on

the Engine/Warning display comes from the

a) EFIS channel of DMC3

# b)ECAM channel of DMC1

c) ECAM channel of DMC3

4. To create a bi-directional communications link within an ARINC 429

system

a) only one databus is required

# b)two databuses are required

c) four databuses are required


5. Using I.N.S. an aircraft flies

a) course directed by ground station

# b)great circle route

c) rhumb line

6. What warnings can an FMS provide?

# a) Discrete warnings

module 5 questions

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