Avionics Exam 1 Questions with Correct Answers (Grade A+)
Question 1: What is a twisted pair?
Answer: two insulated conductors twisted together
Question 2: two steps to building wire harnasses
Answer: pin out (crimping / connecting wires and pins to correct holes) ring out (continuity-checking every
wire to verify correct connectivity between connectors)
Question 3: In what direction may the identification code be stamped on a wire?
Answer: vertically or horizontally
Question 4: A sleeve is stamped with the abbreviation GRN. What does this mean?
Answer: green
Question 5: 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.
Answer: Automated laser or ink marking machines may be used to mark wire.
Question 6: Two benefits of tinning
Answer: encourages heat transfer during soldering securely holds wire strands together
Question 7: Most common solder in aviation industry
Answer: Sn60
Question 8: Which of the following solder types is known as "eutectic"? Sn60 Sn40 Sn37 Sn63
Answer: Sn63
Question 9: At what temperature does Sn60 solder begin to melt?
Answer: 361 degrees F
Question 10: At what temperature does Sn60 become completely liquid?
Answer: 365 degrees F
Page 1
, Question 11: On a small connector, how long should the four soldering steps take to complete?
Answer: No more than 2 seconds
Question 12: What bad technique is likely to heat soak and damage a connector?
Answer: Using a soldering iron with a tip temperature that is too low.
Question 13: Two reasons to avoid soldering adjacent pins
Answer: promote slow cooling avoid heat damage to connector
Question 14: What is a visual indication of a quality solder connection?
Answer: a smooth and shiny surface
Question 15: If a soldering connection fails a visual inspection, what should be done?
Answer: The solder should be removed and the connection re-soldered.
Question 16: What can reduce static electricity noise caused by rain or snow?
Answer: bonding
Question 17: Three liquids for preparing surfaces for grounding or bonding
Answer: isopropyl alcohol soap and water acetone
Question 18: Why should abrasives not be used when preparing a surface for grounding or bonding?
Answer: They may leave corrosive particles embedded in the surface.
Question 19: Maximum allowable resistance allowed across a grounding jumper
Answer: 0.1 Ohms
Question 20: Most efficient class of amplifier
Answer: Class D
Question 21: Amplifier with best fidelity
Answer: Class A
Page 2
Question 1: What is a twisted pair?
Answer: two insulated conductors twisted together
Question 2: two steps to building wire harnasses
Answer: pin out (crimping / connecting wires and pins to correct holes) ring out (continuity-checking every
wire to verify correct connectivity between connectors)
Question 3: In what direction may the identification code be stamped on a wire?
Answer: vertically or horizontally
Question 4: A sleeve is stamped with the abbreviation GRN. What does this mean?
Answer: green
Question 5: 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.
Answer: Automated laser or ink marking machines may be used to mark wire.
Question 6: Two benefits of tinning
Answer: encourages heat transfer during soldering securely holds wire strands together
Question 7: Most common solder in aviation industry
Answer: Sn60
Question 8: Which of the following solder types is known as "eutectic"? Sn60 Sn40 Sn37 Sn63
Answer: Sn63
Question 9: At what temperature does Sn60 solder begin to melt?
Answer: 361 degrees F
Question 10: At what temperature does Sn60 become completely liquid?
Answer: 365 degrees F
Page 1
, Question 11: On a small connector, how long should the four soldering steps take to complete?
Answer: No more than 2 seconds
Question 12: What bad technique is likely to heat soak and damage a connector?
Answer: Using a soldering iron with a tip temperature that is too low.
Question 13: Two reasons to avoid soldering adjacent pins
Answer: promote slow cooling avoid heat damage to connector
Question 14: What is a visual indication of a quality solder connection?
Answer: a smooth and shiny surface
Question 15: If a soldering connection fails a visual inspection, what should be done?
Answer: The solder should be removed and the connection re-soldered.
Question 16: What can reduce static electricity noise caused by rain or snow?
Answer: bonding
Question 17: Three liquids for preparing surfaces for grounding or bonding
Answer: isopropyl alcohol soap and water acetone
Question 18: Why should abrasives not be used when preparing a surface for grounding or bonding?
Answer: They may leave corrosive particles embedded in the surface.
Question 19: Maximum allowable resistance allowed across a grounding jumper
Answer: 0.1 Ohms
Question 20: Most efficient class of amplifier
Answer: Class D
Question 21: Amplifier with best fidelity
Answer: Class A
Page 2
