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Basic Digital Techniques and Electronic Instrument Systems > questions 2 > Flashcards

questions 2 Flashcards

1
Q

what do the initials PIDG stand for?

A

pre insulated diamond grip

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2
Q

when checking the insulation group using the AMP crimping tool, what position number should you start from?

A

position 3

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3
Q

prior to using a PTT, what must the tool be subject to?

A
  • calibration check
  • ratchet check
  • go/no-go check
  • insulation adjustment
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4
Q

crimping a red AMP crimp, how many dots/lines should be visible on the crimp?

A

one dot, two lines

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5
Q

moving a hydraulic crimping tool, what gives an indication that the dies have bottomed?

A
  • internal bypass valve opens, reducing pressure

- dies should not accept 0.001” shim

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6
Q

what procedure should be used when crimping multi-contact connectors if some of the contact positions are not used?

A

blanked off using appropriate blanking plugs

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7
Q

what is eyeball crimping?

A
  • not recommended
  • contact inserted from underside with barrel facing operator
  • align pot with inventors, clamp but do not crimp
  • insert prepared conductor from rear and crimp
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8
Q

on a cable loom that has solder sleeves, what is the stagger distance for the sleeves?

A

between 4-6 inches from plug or receptacle

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9
Q

on a solder sleeve, what size cable is normally used for the tail?

A

22AWG

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10
Q

state the composition of soft solder

A

60% tin, 40% lead

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11
Q

explain the general purpose of heat sinks

A
  • prevents heat sensitive components from being damaged
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12
Q

explain the difference between activated and non activated fluxes and other general areas of use

A

active fluxes contain active agents, used where more active cleaning agents are necessary

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13
Q

state and describe the difference between soft soldering and brazing

A

brazing performed at much higher temperatures

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14
Q

what factors should cables be protected against?

A
  • mechanical damage
  • damage from fluids/vapours
  • heat damage
  • sharp bends
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15
Q

what is the general rule (moisture) with regards to routing of cables to LRU’s?

A

ensure cables run downwards from component

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16
Q

what are the methods used for cable bending and support?

A
  • wax string
  • p-clips
  • tie-wraps
  • looming cord
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17
Q

what factors dictate the composition of a cable loom?

A
  • overall diameter
  • temperature conditions
  • type of current
  • type of system
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18
Q

which areas would you normally use conduit for conveying cables?

A

where possibility of exposure to fuel/hydraulic oil/ other harmful fluids

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19
Q

using a metal conduit in place of a plastic conduit, what additional task needs to be carried out and why?

A

conduit needs to be bonded to airframe (signal interference)

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20
Q

in a pressure bung, and several cables were no longer required, what procedure would you carry out?

A

cut cable 6-9” either side of bing and fir 3/4-1” plain sleeves at each end

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21
Q

what test needs to be carried out after the final installation of a cable pressure seal?

A

pressure test

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22
Q

in a ducted loom, how are the specific consumer systems identified?

A

appropriately coloured wax wiring/string

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23
Q

on a pressure bung that is having wires inserted, what is the general rule?

A

pull wires to desired length before removing tool

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24
Q

what is the purpose of bonding?

A

joining two or more conducting objects in such a way that an electrical current may flow easily from one to the other

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25
Q

define primary and secondary conductors and the sizes normally used

A
  • primary conductors carry lightning strikes - 3/6mm squared

- secondary conductors - all other forms of bonding - 1mmsquared

26
Q

where would you find a sacrificial plate?

A

between two dissimilar metals

27
Q

what is the term inherent bonding?

A

adequate electrical path between parts and assemblies without any special action

28
Q

how does a ground discharge method work?

A
  • through nose wheel tire impregnated with electrically conducting compound or static discharge whip trailed from landing wheel assy
29
Q

what are periodic inspections of bonding and earth assemblies carried out for?

A

signs of

  • overheating
  • corrosion
  • resistance checks
30
Q

what are the two testers used to measure bonding resistance?

A
  • 250V insulation tester

- the bonding tester

31
Q

which organisation states the maximum resistance values for primary bonding between extremities of the fixed portions of aircraft of non metallic or composite contstruction?

A

the CAA

32
Q

what test should be carried out on earth terminal assemblies that are also used to carry electrical supplies?

A

millivolt drop test

33
Q

when heat shrinking, where should the heat be applied to first?

A

centre of heat shrink, working outwards

34
Q

what is the normal curing time for adhesive type s1006?

A

24H at room temp, 2-4 days for max strength

35
Q

what psi air supply is required in a raychem thermopistol?

A

50psi

36
Q

how long should you leave a raychem thermopistol to stabilise the temperature and also the time to elapse before disconnecting the air supply on completion?

A
  • 15 min to stabilise

- 5 min before disconnecting

37
Q

when a potting connector becomes unserviceable, what should it be replaced with?

A

one of the new EP connectors

38
Q

what are the forces that exist in a basic meter movement?

A
  • deflecting force (current in the coil)
  • controlling force (spring strength)
  • damping force (prevents hunting)
39
Q

in older meters, how was hunting of the needle eliminated?

A

a small air dashpot connected to the movement

40
Q

state the two types of meters

A
  • moving iron

- moving coil

41
Q

what principle do meters operate on?

A

motor principle, i.e. magnetic repulsion

42
Q

what material are shunts used in current meters made from?

A

manganin

43
Q

what principle is used in meters that measure resistance?

A
  • measure the current flow through an unknown resistor
  • instrument movement as a DC ammeter
  • internal dry battery as a voltage source
44
Q

what value would you expect to find on a perfect insulator using a megger?

A

infinity

45
Q

what are the advantages and disadvantages of a moving coil meter?

A

advantage
- measures current and voltage
disadvantage
- cannot be used on AC

46
Q

what is the main advantage of a moving iron type meter?

A

advantages

  • cheap
  • used on AC and DC
47
Q

what aircraft systems would you not use a bonding tester on?

A

explosive or pyrotechnic systems (1A current more than 10mA required to set off)

48
Q

what effect does power variations have on a ratiometer system?

A

accurate over small variations in supply voltage

49
Q

state the general use of a clamp meter and its general description of operation

A
  • measures current through enclosing

- transformer principle

50
Q

on an oscilloscope waveform with a period of 4ms, calculate the frequency

A
  • 1/time period

- 250Hz

51
Q

state the correct sequence to carry out inspections on an aircraft

A
  • Visual (very)
  • Bonding (big)
  • Continuity testing (cow)
  • Insulation resistance check (in)
  • Functional (field)
52
Q

what equipment would be used to determine if a coaxial cable has insulation resistance damage?

A

time domain reflectometer

53
Q

if modifications or repairs have been carried out in the vicinity of looms, what additional inspections/checks are carried out?

A

inspection for swarf/tooling/damage to wires in vicinity

54
Q

using a bonding tester, which lead is connected first and why?

A

connect probe B first. then A. risk of damage otherwise

55
Q

what test would be carried out on cables that have been stamped?

A

british standard test 16

56
Q

how can the accuracy of a bonding tester be determined?

A
  • checked periodically by measuring resistance of standard test resistors
  • should be within 10% of resistor value
57
Q

what methods could be used to carry out a continuity check?

A
  • end to end
  • short between two cables
  • use aircraft structure
58
Q

what specification is used to standardise documentation?

A

ATA 100

59
Q

which manual shows a picture of aircraft components and gives the part number?

A

illustrated parts catalogue

60
Q

which manual supplies information on aircraft wiring configuration?

A

wiring diagram manual

61
Q

what are the two types of wiring diagram?

A
  • schematic

- wiring diagram

62
Q

how is the typical numbering system of chapters known?

A
  • 24-20-14
  • chapter
  • sub-system
  • unit/system

Basic Digital Techniques and Electronic Instrument Systems (4 decks)

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