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1. Soldering tips that are plated with an oxidation-resistant coating will be cleaned, while cold, with:

a. Emery or Aluminum Oxide clothe with approximately 320 grit.
b. A flat, single cut file.
c. Mild nitric acid (20% by volume)
d. Boiling water.

2. Why must adequate ventilation be required during preparation, soldering, and cleaning of the soldered connection?

a. To vent toxic fumes caused by thermal wire strippers.
b. To vent acrid fumes created by melting flux, oxides, and molten solder.
c. To vent highly flammable cleaning solvents.
d. All of the above.

3. Insulation clearance:

a. Is the length of exposed bare wire, not to exceed 1/10 inch, between the insulation and the terminal after the connection is soldered.
b. Shall be a minimum of one wire diameter, or a maximum of 2 diameters (including insulation).
c. Shall be a minimum of three wire diameters (including insulation).
d. Any visible clearance.

4. Soldering irons must be temperature controllable and set to a temperature which will allow an acceptable solder connection to be made in a maximum time of:

a. 3 seconds
b. 4 seconds
c. 5 seconds
d. 10 seconds

5. The most accurate meaning of heat bridge is:

a. A heat-absorbing device that prevents wicking.
b. A part of a terminal or connection where the wire enters.
c. A device for measuring thermal expansion.
d. A small amount of solder between the iron and the connection that maximizes the rapid transfer of heat.

6. The best definition of wicking is:

a. The part of a terminal where a wire enters to make a connection.
b. Melting at the lowest possible temperature.
c. Capillary action pulling solder into a stranded wire.
d. A layer of protective substance that conforms to or follows the outline of components on a printed circuit board.

7. When soldering a connection, where is the proper location to first apply the solder?

a. To the right of the terminal axis.
b. Right where the component lead enters the terminal.
c. Opposite the soldering tip, to prevent thermal expansion.
d. Where the soldering tip touches the terminal, forming a Heat Bridge.

8. What is the maximum length of time residual flux may be left on a connection?

a. 5 minutes
b. 30 minutes
c. 90 minutes
d. 24 hours

9. What is the minimum acceptable wire wrap when using a hook terminal?

a. 0 degrees (0 turns)
b. 90 degrees (1/4 turn)
c. 180 degrees (1/2 turn)
d. 270 degrees (3/4 turn)

10. The proper definition of bird-caging is:

a. The flat portion (bottom) of a terminal that a wire rests on.
b. The ability to resist oxidation.
c. Any disturbance of the natural lay of the wire in a stranded conductor.
d. The proper preparation of a stranded conductor prior to tinning.

11. Select the best definition of thermal shunt:

a. A device for intensifying the heat from a soldering iron.
b. A device for heating a cathode-ray tube.
c. A device used to prevent heat from damaging a component or wicking.
d. None of the above.

12. Which type of wire stripper is not allowed?

a. Thermal type.
b. Cutting type allowing operator adjustment.
c. Factory-set precision cutting type.
d. None of the above.

13. If another type of flux is not specified, what type of flux should be used if more is needed?

a. RMA (Rosin Mildly Activated)
b. RA (Rosin Activated)
c. R (Rosin)
d. A (Activated)

14. Bare copper showing at the cut end of the stranded wire terminal lead on a completed soldered connection is acceptable.

a. True
b. False

15. In selecting the proper size iron for soldering, what factor(s) should be considered?

a. The percent of zinc in the solder.
b. The electrical resistance of the components to be soldered.
c. The temperature at which flux melts.
d. The size and type of connections to be soldered.

16. What does dewetting mean?

a. Drying off a circuit board in preparation for encapsulation.
b. Use of a solvent to clean a circuit board.
c. A condition that results when molten solder has coated a surface and has then receded.
d. A condition brought about by the improper use of tools or incorrect solder alloy.

17. A clean soldering iron tip, must be applied to surface to be soldered within how many seconds after wiping tip.

a. 3 seconds
b. 6 seconds
c. 10 seconds
d. 60 seconds

18. What is the minimum amount of wire wrap for a lead connected to a turret terminal?

a. 0 degrees (0 turns)
b. 90 degrees (1/4 turn)
c. 180 degrees (1/2 turn)
d. 270 degrees (3/4 turn)

19. According to T.O. 00-25-234, a stretched, nicked, or scraped strand of wire:

a. Can be used if the defect is properly tinned.
b. Can be used only if the defect is between the trimmed insulation and the terminal to be soldered.
c. Can be used if the application is non-sensitive.
d. Cannot be used.

20. All portions of a stranded wire which come in contact with the area to be soldered will be:

a. Insulated
b. Tinned
c. Grounded
d. Desoldered

21. After stripping the wire with thermal strippers, and preparing it for installation, the insulation may exhibit which of the following:

a. Burned insulation.
b. Cut insulation.
c. Slightly discolored insulation.
d. Split insulation.

22. Soldering is the process of joining two or more metals together by the application of heat using:

a. A low melting point alloy.
b. A high melting point alloy.
c. An alloy that will not melt at soldering temperatures.
d. An alloy that melts before the flux melts.

23. What precaution(s) should be taken when preparing stranded wire for soldering?

a. Do not use excessive solder when tinning.
b. Do not disturb the natural contour lay of the wire.
c. Avoid nicking, cutting, bird caging or stretching wire strands when bending.
d. All of the above.

24. One characteristic of an acceptable flux is:

a. That it be a non-wetting type.
b. That it resist melting at soldering temperatures.
c. That it have good electrical conductance.
d. That it melts below the melting point of solder.

25. How are flux and other impurities removed from a solder connection?

a. With soap and water.
b. With a wire brush dipped in some solvent.
c. With compressed air.
d. With a medium-stiff bristle brush dipped in an approved solvent.

26. The cutting type stripping tool is generally recommended for Teflon insulated wire.

a. True
b. False

27. The most accurate meaning of fillet is:

a. A terminal with a looped end for the connection.
b. A narrow band of solder, concave in shape, between two objects that are soldered together.
c. A connection between the two sides of a double-sided circuit board.
d. None of the above.

28. What is the maximum amount of wire wrap for a lead connected to a turret terminal?

a. 0 degrees (0 turns)
b. 90 degrees (1/4 turn)
c. 180 degrees (1/2 turn)
d. 270 degrees (3/4 turn)

29. Which of the following describes flux best?

a. Something used to prevent heat damage to a component.
b. A compound used to neutralize the lead and tin content in SN 63 solder.
c. A substance used to clean and prevent further oxide from forming during the soldering process.
d. A synthetic material used in a plating process.

30. It is essential to use a soldering iron that grounds the iron tip to the power supply unit utilizing a three wire power cord to:

a. Prevent electrical shock to the operator.
b. Provide quicker heat transfer.
c. Prevent current leakage damage to the soldered component.
d. Eliminate the need for a heat sink.

31. What type of wire stripper if practical should be used with Teflon insulated wire?

a. A sharp knife blade used carefully.
b. Precision cutting type.
c. Operator adjustment type.
d. Thermal strippers.

32. Why is it important in the soldering of electronic equipment to make a good joint?

a. To insure impervious mechanical bond in the solder joint.
b. To reduce the possibilities of electrical shock.
c. To make a permanent and continuous metallic connection having a constant electrical value.
d. To satisfy the Quality Control Inspectors.

33. Acceptable soldered connections will have:

a. A shiny, bright appearance.
b. A convex fillet between the wire lead and the terminal.
c. No more than two voids.
d. No visible contour of the wire strands showing through the solder.

34. What precautions should be taken when stripping Teflon or plastic insulation using thermal strippers?

a. Make sure the diameter of the wire is greater than 1/32 inch.
b. Use only low conductivity wires with the strippers.
c. Use proper exhaust mechanisms to remove the toxic fumes.
d. Use only low temperature thermal strippers.

35. What is an abrasion point on a completed soldered connection?

a. A nicked or cut strand of wire.
b. A disturbance of the natural lay of stranded wire.
c. The pointed cut end of wire not being tinned.
d. The cut end of a lead wire extending beyond the terminal diameter.

36. What is the minimum percent of available space that must be left open on a side-entry bifurcated connection?

a. 20%
b. 25%
c. 30%
d. 35%

37. When a specific overhaul technical manual is not available, what technical order demonstrates general shop soldering practices?

a. 00-25-234
b. 00-74-15
c. Overhaul Tech Order (1-3)
d. 12-6-1

Answers posted in a couple weeks got to go TDY

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Ummm, is this a test Question

And what is the relevance to the F-16 Question

1. C (should be cleaned hot with a moist sponge)
2. D
3. B
4. C
5. D
6. C
7. D
8. C
9. C
10. C
11. C
12. B
13. C
14. B
15. D
16. C
17. B
18. C
19. D
20. B
21. C
22. A
23. D
24. D
25. D
26. B
27. B
28. D
29. C
30. C
31. D
32. C
33. A
34. C
35. D
36. A
37. A

Hi Rel is a solder discipline for many of the wire repairs on the F-16.

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Forum: F-16 Design & Construction

High reliability soldering questions