Avionics Exam 1 UPDATED ACTUAL
Exam Questions and CORRECT Answers
What is a twisted pair? - CORRECT ANSWER - two insulated conductors twisted together
two steps to building wire harnasses - CORRECT ANSWER - pin out (crimping /
connecting wires and pins to correct holes)
ring out (continuity-checking every wire to verify correct connectivity between connectors)
In what direction may the identification code be stamped on a wire? - CORRECT
ANSWER - vertically or horizontally
A sleeve is stamped with the abbreviation GRN. What does this mean? - CORRECT
ANSWER - green
Which of the following is true regarding wire marking machines?
- Automated laser or ink marking machines may be used to mark wire.
- Automated machines only use lasers.
- Automated machines may only be used with the ink stamping method.
- Automated machines should not be used to mark wire. - CORRECT ANSWER -
Automated laser or ink marking machines may be used to mark wire.
Two benefits of tinning - CORRECT ANSWER - encourages heat transfer during
soldering
,securely holds wire strands together
Most common solder in aviation industry - CORRECT ANSWER - Sn60
Which of the following solder types is known as "eutectic"?
Sn60
Sn40
Sn37
Sn63 - CORRECT ANSWER - Sn63
At what temperature does Sn60 solder begin to melt? - CORRECT ANSWER - 361
degrees F
At what temperature does Sn60 become completely liquid? - CORRECT ANSWER - 365
degrees F
On a small connector, how long should the four soldering steps take to complete? - CORRECT
ANSWER - No more than 2 seconds
What bad technique is likely to heat soak and damage a connector? - CORRECT
ANSWER - Using a soldering iron with a tip temperature that is too low.
Two reasons to avoid soldering adjacent pins - CORRECT ANSWER - promote slow
cooling
avoid heat damage to connector
, What is a visual indication of a quality solder connection? - CORRECT ANSWER -a
smooth and shiny surface
If a soldering connection fails a visual inspection, what should be done? - CORRECT
ANSWER - The solder should be removed and the connection re-soldered.
What can reduce static electricity noise caused by rain or snow? - CORRECT ANSWER -
bonding
Three liquids for preparing surfaces for grounding or bonding - CORRECT ANSWER -
isopropyl alcohol
soap and water
acetone
Why should abrasives not be used when preparing a surface for grounding or bonding? -
CORRECT ANSWER - They may leave corrosive particles embedded in the surface.
Maximum allowable resistance allowed across a grounding jumper - CORRECT
ANSWER - 0.1 Ohms
Most efficient class of amplifier - CORRECT ANSWER - Class D
Amplifier with best fidelity - CORRECT ANSWER - Class A
Which of the following is a characteristic of a crystal oscillator?
- It is stable.
Exam Questions and CORRECT Answers
What is a twisted pair? - CORRECT ANSWER - two insulated conductors twisted together
two steps to building wire harnasses - CORRECT ANSWER - pin out (crimping /
connecting wires and pins to correct holes)
ring out (continuity-checking every wire to verify correct connectivity between connectors)
In what direction may the identification code be stamped on a wire? - CORRECT
ANSWER - vertically or horizontally
A sleeve is stamped with the abbreviation GRN. What does this mean? - CORRECT
ANSWER - green
Which of the following is true regarding wire marking machines?
- Automated laser or ink marking machines may be used to mark wire.
- Automated machines only use lasers.
- Automated machines may only be used with the ink stamping method.
- Automated machines should not be used to mark wire. - CORRECT ANSWER -
Automated laser or ink marking machines may be used to mark wire.
Two benefits of tinning - CORRECT ANSWER - encourages heat transfer during
soldering
,securely holds wire strands together
Most common solder in aviation industry - CORRECT ANSWER - Sn60
Which of the following solder types is known as "eutectic"?
Sn60
Sn40
Sn37
Sn63 - CORRECT ANSWER - Sn63
At what temperature does Sn60 solder begin to melt? - CORRECT ANSWER - 361
degrees F
At what temperature does Sn60 become completely liquid? - CORRECT ANSWER - 365
degrees F
On a small connector, how long should the four soldering steps take to complete? - CORRECT
ANSWER - No more than 2 seconds
What bad technique is likely to heat soak and damage a connector? - CORRECT
ANSWER - Using a soldering iron with a tip temperature that is too low.
Two reasons to avoid soldering adjacent pins - CORRECT ANSWER - promote slow
cooling
avoid heat damage to connector
, What is a visual indication of a quality solder connection? - CORRECT ANSWER -a
smooth and shiny surface
If a soldering connection fails a visual inspection, what should be done? - CORRECT
ANSWER - The solder should be removed and the connection re-soldered.
What can reduce static electricity noise caused by rain or snow? - CORRECT ANSWER -
bonding
Three liquids for preparing surfaces for grounding or bonding - CORRECT ANSWER -
isopropyl alcohol
soap and water
acetone
Why should abrasives not be used when preparing a surface for grounding or bonding? -
CORRECT ANSWER - They may leave corrosive particles embedded in the surface.
Maximum allowable resistance allowed across a grounding jumper - CORRECT
ANSWER - 0.1 Ohms
Most efficient class of amplifier - CORRECT ANSWER - Class D
Amplifier with best fidelity - CORRECT ANSWER - Class A
Which of the following is a characteristic of a crystal oscillator?
- It is stable.
