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Avionics Finals > Avionics 103 Final > Flashcards

Avionics 103 Final Flashcards

1
Q

Pitting on a solder joint is cause by:
-Moving the soldered item while solder is still in liquid form

  • a good solder joint
  • a bad quality solder being used
  • too much heat
A

Too much heat

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2
Q

A cold solder joint has an increased resistance to current flow

  • True
  • False
A

True

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3
Q

A good solder joint should be shiny with slight ripples in it.

  • True
  • False
A

False

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4
Q

EMI stands for

A

Electro-magnetic Interference

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5
Q

Shielded wires are used to reduce EMI.

  • True
  • False
A

True

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6
Q

A daisy chain is designed so that if any one solder connection breaks, all the wires are still grounded through that daisy chain.

  • True
  • False
A

False

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7
Q

It is ok if a strand sticks out of the solder sleeve.

  • True
  • False
A

False

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8
Q

Contact cleaner needs to leave no residue.

  • True
  • False
A

True

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9
Q

Tinning the solder tip will prevent it from______

  • heating
  • melting
  • soldering
  • oxidizing
A

Oxidizing

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10
Q

Proper solder adhesion requires the metal surface to be_______.

  • solder free
  • clean
  • greasy
  • cold
A

Clean

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11
Q

Solder wick is used to______.

  • remove solder
  • solder in small parts
  • cleaning the solder iron tip
  • removing flux
A

-Remove solder

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12
Q

A cold solder joint is caused by_______.

  • a solder bridge
  • using the wrong solder
  • insufficient heat
  • acid core solder
A

insufficient heat

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13
Q

Tinning the wire is not required if you are putting the wire in a solder ring.

  • True
  • False
A

False

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14
Q

A dull finish indicates a good solder.

  • True
  • False
A

False

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15
Q

What is the purpose of the daisy chain?

  • To prevent EMI
  • So one side of wire bundle can be grounded
  • All of the above
A

All of the above

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16
Q

How do you know when the solder ring is properly melted?

  • When the heatshrink is completely melted
  • When the solder ring is completely melted
A

When the solder ring is completely melted

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17
Q

Why is heatshrink used over solder connections?

  • To support the solder joint
  • To protect the solder joint from over heating
  • To help prevent shorting of the solder joint
  • All of the above
A

To help prevent shorting of the solder joint

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18
Q

What are the two ways of removing excess solder from a joint?

  • Solder wick and using your solder iron to pull solder onto your solder tip
  • Solder wick and solder sucker
A

Solder wick and solder sucker

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19
Q

What is the purpose of cleaning the inside of an electrical connector before soldering wires in the connector cups?

  • To remove dirt and debris out of the connector to improve solder adhesion
  • To clean minor corrosion
  • All of the above
A

All of the above

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20
Q

Why would changing tip size change the way you apply solder?

  • You will need more solder to get the job done.
  • You will need to adjust the application based on more or less heated surface on the tip.
A

-You will need to adjust the application based on more or less heated surface on the tip.

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21
Q

If you are doing multiple buttsplices in a bundle at the same location, you need to make sure that the buttspices are______.

A

Staggered

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22
Q

If you are doing the tyco buttsplice in a protected area, it is allowed that you can leave off the heatshrink sleeve.

  • True
  • False
A

False

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23
Q

The wires are loose in the backshell clamp. You can use ___________ to build up the diameter, so it fits snug into the clamp.

A

Guideline tape

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24
Q

It is not necessary to connect the shield if you are crimping a new section of shielded wiring.

  • True
  • False
A

False

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25
Q

Where do you find the information for trimming a coax so it will work with the BNC?

  • Get the information off the crimper
  • Research the part number to identify the correct crimper
  • Research the part number to find the manufacturer’s drawing for the trimming dimensions.

Research the part number of the coax to find the correct dimensions.

A

Research the part number to find the manufacturer’s drawing for the trimming dimensions.

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26
Q

Your braid must be under the sleeve when you crimp it. None of the braid appears outside of that sleeve.

  • True
  • False
A

True

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27
Q

You can use your plastic removal/extraction tool for a front release connector.

  • True
  • False
A

False

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28
Q

How many different types of environmental splices did you do in lab?

  • 1
  • 2
  • 3
  • 4
A

3

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29
Q

Where do you find the information to adjust the depth of the crimp on your contact before installing it in your connector.

A

on the locator

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30
Q

If you tug on the contact after crimping and the wire pulls right out, what is the most likely problem?

  • The wrong crimper was used
  • You did not finish the crimp process
  • The crimp depth was not set right
  • The clip in the connector did not lock
A

The crimp depth was not set right

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31
Q

Out in the industry, if a pin does not lock in the connector, what can you do?

  • Use superglue to install the pin
  • Replace the connector
  • Move the pin to a different location and correct the wiring diagram.
  • Both B & C
A

Replace the connector

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32
Q

Molex pins are used on new technology and require specific crimpers.

  • True
  • False
A

False

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33
Q

Why is crimping more common in the industry instead of soldering?

  • crimping is cheaper
  • it is not, solder is used more
  • crimping uses more expensive tooling
  • crimping takes less time than soldering
A

crimping takes less time than soldering

34
Q

You find a contact, and you do not know what the part number is, how would you find the part number?

  • Look up the part number on the contact
  • Go to a website and check based on color strips on the contact.
  • Look up the connector part number to get the part number.
A

Go to a website and check based on color strips on the contact.

35
Q

There are two different set names for the pins in a connector, give one set of names.

A

pins and sockets

36
Q

How do you determine if a crimp is a good crimp? Give two things you would do.

  • Give it a tug and visually inspect the crimp
  • Give it a tug and make sure it locks into the connector.

Give it a tug and make sure there are no strands sticking out.

Ring it out and give it a tug.

A

Ring it out and give it a tug.

37
Q

It is okay to crimp something twice, if you are not happy with the first crimp.

  • True
  • False
A

False

38
Q

The crimp on the pin is located where?

  • The barrel where the insulator goes in.
  • The barrel where you would see color stripes
  • All of the above
A

The barrel where you would see color stripes

39
Q

Crimp connectors have two types of release systems to allow the pins to be removed. What are those two types?

A

front and rear release

40
Q

You must always hear the click when inserting a pin in the connector.

  • True
  • False
A

False

41
Q

What is the type of locking mechanism does your silver connector have?

  • Bayonet connector
  • Breech-loc connector
  • Acme Threads
A

Bayonet connector

42
Q

When a connector has a hard plastic front, that tells you that it is a ________ release connector.

  • Front
  • Rear
A

Rear

43
Q

What is the purpose of an environmental splice?

  • To protect the bundle from the environment
  • To protect the wire from rocks or gravel being kicked up into the wiring
  • To protect the wire from weather or outside conditions
A

To protect the wire from weather or outside conditions

44
Q

How do you know which crimp tool to use, when crimping a ring terminal?

  • Research the part number to identify the correct crimper
  • The crimper is based on wire AWG and is color coded
  • You use the Tyco crimpers
A

The crimper is based on wire AWG and is color coded

45
Q

How would you find the correct crimp tool for a connector?

  • Research the part number to identify the correct crimper
  • The crimper is based on wire AWG and is color coded
  • You use the Tyco crimper
A

Research the part number to identify the correct crimper

46
Q

When using the AC43-13-1B as a reference in a signoff, you can use the page number.

  • True
  • False
A

False

47
Q

When using the AC 43-13-1B you are using a paragraph that has several specific sub-paragraphs in it. Only one of those sub-paragraphs apply to the job you did on the aircraft, you should always reference the whole paragraph.

  • True
  • False
A

False

48
Q

The vertical lines down the side of sections of the AC 43-13-1B indicate_______

  • nothing
  • an optional version of the paragraph before
  • new information based on previous publication
A

new information based on previous publication

49
Q

You do not have to use the electronic version of the AC-43-13-1B out in the field?

  • True
  • False
A

True

50
Q

When tying a lacing cord knot, it must have some room to move due to vibration.

  • True
  • False
A

False

51
Q

The primary function of a service loop is to loop excess wiring, so wiring repairs can happen in the future.

  • True
  • False
A

False

52
Q

When replacing copper wires with aluminum, what is the rule about the size of wire?

  • You must go up (diameter) two sizes
  • You must go down (diameter) two sizes
  • The wiring remains the same
A

You must go up (diameter) two sizes

53
Q

A conduit is designed to protect wiring that runs through it and must have a drain hole at its lowest point.

  • True
  • False
A

True

54
Q

For shielded wiring to be successful, it must cover what % of the wiring.

A

85% coverage

Paragraph 11-106

55
Q

Are most relays repairable?

A

Not repairable

Paragraph 11-48(c)

56
Q

What knot should you use to tie a wire bundle running through the aircraft?

A

Clove hitch secured with a square knot

paragraph 11-158(b)

57
Q

What is the primary function of a service loop?

A

To provide ease of maintenance

Paragraph 11-135

58
Q

How is a service loop inspected?

A

Adequate length, Breakout Point, Routing, Harness Termination

Paragraph 11-139 (a, b, c, d)

59
Q

What is the maximum allowable slack in a wire bundle between two clamps?

A

Slack not exceeding ½” deflection off center

Paragraph 11-118

60
Q

What does SWAMP stand for? Give its definition.

A

Severe Wind And Moisture Problems

61
Q

Are shielded wires used to reduce EMI?

A

Yes

62
Q

Ratcheting crimpers must be used for insulated terminals.

  • True
  • False
A

True

63
Q

How many splices can be in one segment? What is a segment?

A

There should not be more than one splice in any one wire segment.

A “segment” is any section of wire “between two connectors or other disconnect points.”

64
Q

Why are splices in a bundle must be staggered?

A

To minimize any increase in the size of the bundle, preventing the bundle from fitting into its designated space, or cause congestion that will adversely affect maintenance.

65
Q

Why would you have a drain hole in a conduit? Where would it be located?

A

Prevent moisture entrapment.

At the lowest point in a conduit run.

66
Q

“Ringing out” is specific to shorts and continuity checks is specific for opens.

  • True
  • False
A

False

67
Q

A circuit breaker popping indicates what?

A

Short

68
Q

When using a TDR, a short is indicated with the line going _______.

  • Up
  • Down
  • Stays the same
A

Down

69
Q

An aircraft wiring diagram gives the technician an idea of how much resistance is in that circuit.

  • True
  • False
A

False

70
Q

When using a TDR, an open is indicated with the line going ______.

  • Up
  • Down
  • Stays the same
A

Up

71
Q

Can you use a TDR to troubleshoot an open?

  • Yes
  • No
A

Yes

72
Q

What does TDR stand for?

A

time domain reflectometer

73
Q

A wiring diagram gives the amount of amps running through the wire?

  • True
  • False
A

False

74
Q

What is the proper way to cut plastic wire ties?

  • with scissors
  • with a knife
  • with semi-flush diagonal pliers
  • with flush-cut diagonal pliers and cut flush.
A

with flush-cut diagonal pliers and cut flush

75
Q

A gasket or sealant is used between the antenna mast and the fuselage skin_____.

A

-to prevent the entry of moisture

76
Q

Wires running in a bundle between two clamps should be secure and should not have any slack.

  • True
  • False
A

False

77
Q

A pattern of static indicates EMI.

  • True
  • False
A

True

78
Q

What does EMI stand for?

A

electro-magnetic interference

79
Q

Looking at a wiring diagram. You see two wires running from connector A to connector B. These wires have a circle around the two wires at the ends of the wires near connector A and B. What does those circles mean?

A

shielded wires

80
Q

Can you use a Meggar to troubleshoot an open?

  • Yes
  • No
A

No

81
Q

You have a write up that states that the C/B pops when power is supplied you have changed everything and rang out wires with your meter. How would you continue troubleshooting this short?

A

Use a meggar

82
Q

When troubleshooting a live circuit with voltage on it, that can not be disconnected because of other work on the aircraft. Can you do a continuity check.

  • Yes
  • No
A

No

Avionics Finals (2 decks)

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