Neets Module 4 Ch 2

Front 1

Q1. What are the basic requirements for any splice or terminal connection?

Back 1

A1. The connection must be both mechanically and electrically as strong as the conductor or device
with which it is used

Front 2

Q2. What is the preferred method for stripping wire?

Back 2

A2. By use of a wire-stripping tool

Front 3

Q3. What stripping tool would NOT be used to strip glass braid insulation?

Back 3

A3. Hot-blade stripper.

Front 4

Q4. What tool should be used to strip aluminum wire?

Back 4

A4. Knife.

Front 5

Q5. Why are the ends of the wire clamped down after a Western Union splice is made?

Back 5

A5. To prevent damage to the tape insulation.

Front 6

Q6. Why are splices staggered on multiconductor cables?

Back 6

A6. To prevent the joint from being bulky.

Front 7

Q7. Where is the rattail joint normally used?

Back 7

A7. When wires are in conduit and a junction box is used.

Front 8

Q8. Which type of splice is used to splice a lighting fixture to a branch circuit?

Back 8

A8. Fixture joint.

Front 9

Q9. Which of the splices discussed is NOT a butted splice?

Back 9

A9. Knotted tap joint.

Front 10

Q10. Why is friction tape used in splicing?

Back 10

A10. As a protective covering over the rubber tape.

Front 11

Q11. What is a major advantage of the crimped terminal over the soldered terminal?

Back 11

A11. Requires relatively little operator skill to install.

Front 12

Q12. What are the two types of insulation most commonly used for noninsulated splices and terminal
lugs?

Back 12

A12. Spaghetti or heat-shrinkable tubing.

Front 13

Q13. What is the maximum allowable temperature that should be used on heat-shrinkable tubing?

Back 13

A13. 300º F

Front 14

Q14. What is the maximum allowable source pressure that can be used with the compressor
air/nitrogen heating tool?

Back 14

A14. 200 psig.

Front 15

Q15. Should aluminum wire be cleaned prior to installing an aluminum terminal lug or splice?

Back 15

A15. No, it is done automatically by the petroleum abrasive compound that comes in the terminal or
splices.

Front 16

Q16. What tools should be used to install large aluminum terminal lugs and splices?

Back 16

A16. Power-operated crimping tools.

Front 17

Q17. Why should a lockwasher never be used with an aluminum terminal?

Back 17

A17. It gouges the terminal lug and causes deterioration.

Front 18

Q18. What is the most common method of terminating and splicing wires?

Back 18

A18. The use of preinsulated splices and terminal lugs.

Front 19

Q19. Besides not having to insulate a noninsulated terminal, what other advantage is gained by using
a preinsulated terminal lug?

Back 19

A19. It has insulation support for extra supporting strength of the wire insulation.

Front 20

Q20. Why are preinsulated terminal lugs and splices color coded?

Back 20

A20. To identify wire sizes they are to be used on.

Front 21

Q21. Why must items to be soldered be cleaned just prior to the soldering process?

Back 21

A21. Solder will not adhere to dirty, greasy, or oxidized surfaces.

Front 22

Q22. What does "tinning" mean in relationship to soldering?

Back 22

A22. The coating of the material to be soldered with a light coat of solder.

Front 23

Q23. Why should wire be stripped 1/32 inch longer than the depth of the solder barrel?

Back 23

A23. To prevent burning the insulation during the soldering process and to allow the wire to flex
easier at a stress point.

Front 24

Q24. How much of the stripped length of a conductor should be tinned?

Back 24

A24. One-half the stripped length.

Front 25

Q25. What causes a "fractured solder" joint?

Back 25

A25. Movement of the parts being soldered while the solder is cooling.

Front 26

Q26. Define thermal inertia.

Back 26

A26. The capacity of the soldering iron to generate and maintain a satisfactory soldering temperature
while giving up heat to the joint being soldered.

Front 27

Q27. Why are small-wattage soldering irons not used to solder large conductors?

Back 27

A27. Although its temperature is as high as the larger irons, it does not have thermal inertia.

Front 28

Q28. State why a well-designed soldering iron is self-regulating.

Back 28

A28. The resistance of its heating element increases with rising temperature, thus limiting the current
flow.

Front 29

Q29. What should be done to a soldering iron tip that is pitted?

Back 29

A29. File the tip until it is smooth and retin it.

Front 30

Q30. What happens if a soldering gun switch is pressed for periods longer than 30 seconds?

Back 30

A30. It will overheat and could burn the insulation of the wire being soldered.

Front 31

Q31. What causes the nuts or screws that hold the tips on soldering irons and guns to loosen?

Back 31

A31. The heating and cooling cycles.

Front 32

Q32. A soldering gun should NOT be used on what components?

Back 32

A32. Electronic components, such as resistors, capacitors, and transistors.

Front 33

Q33. What is an advantage of using a resistance soldering iron when soldering wire to a connector?

Back 33

A33. The soldering tips are hot only during the brief period of soldering the connection, thus
minimizing the chance of burning the wire insulation or connector inserts.

Front 34

Q34. Why is steel wool NEVER used as an abrasive to clean soldering tools?

Back 34

A34. The strands can fall into electrical equipment being worked on and cause short circuits.

Front 35

Q35. Why should "antiseize" compound be used on the screw-in tips of the pencil iron?

Back 35

A35. It enables the tip to be removed easily when another is to be inserted.

Front 36

Q36. If no suitable tip is available for a particular job, how may one be improvised?

Back 36

A36. Wrap a length of copper wire around one of the regular tips and bend to the proper shape for the
purpose.

Front 37

Q37. What two metals are used to from soft solder?

Back 37

A37. Tin and lead.

Front 38

Q38. Define the metal solvent action that takes place when copper conductors are soldered together.

Back 38

A38. The solder dissolves a small amount of the copper, which combines with the solder forming a new
alloy; therefore, the joint is one common metal.

Front 39

Q39. What is the tin-lead alloy percentage of solder used for electrical connectors, splices, and
terminal lugs?

Back 39

A39. 60-percent tin and 40-percent lead (60/40 solder).

Front 40

Q40. What purpose does flux serve in the soldering process?

Back 40

A40. It cleans the metal by removing the oxide layer and prevents further oxidation during the
soldering.

Front 41

Q41. What type of flux must be used in all electrical and electronic soldering?

Back 41

A41. Noncorrosive, nonconductive rosin fluxes.

Front 42

Q42. Why are solvents used in the soldering process?

Back 42

A42. To remove contaminants from soldered connections.

Front 43

Q43. What is the purpose of a heat shunt?

Back 43

A43. To prevent damage to heat-sensitive components.

Front 44

Q44. Besides presenting a neat appearance and supporting each other, what is the other purpose for
lacing conductors?

Back 44

A44. To aid in tracing the conductors when alterations or repairs are required.

Front 45

Q45. Why is flat tape preferred instead of round cord when wire bundles are laced?

Back 45

A45. Round cord has a tendency to cut into the wire insulation.

Front 46

Q46. What amount of flat tape or round cord is required to single lace a group of conductors?

Back 46

A46. Two and one-half times the length of the longest conductor in the group.

Front 47

Q47. What is the purpose of a lacing shuttle?

Back 47

A47. To keep the tape or cord from fouling during the lacing operation.

Front 48

Q48. When should wires be twisted prior to lacing?

Back 48

A48. When required, such as for the filament leads in electron tube amplifiers.

Front 49

Q49. What precautions should you take when tying bundles containing coaxial cables?

Back 49

A49. Do not tie too tightly and use the proper type of tape.

Front 50

Q50. How is the single lace started?

Back 50

A50. With a square knot and at least two marling hitches drawn tightly.

Front 51

Q51. What size wire bundles require double lace?

Back 51

A51. Bundles that are 1 inch or larger in diameter

Front 52

Q52. How is the double lace started?

Back 52

A52. With a telephone hitch.

Front 53

Q53. How are laced cable groups bound together?

Back 53

A53. They are bound together at intervals with telephone hitches.

Front 54

Q54. When are spot ties used?

Back 54

A54. When wire bundles are supported by cable supports that are more than 12 inches apart.

Front 55

Q55. What is used to install self-clinching cable straps?

Back 55

A55. Military Standard hand tool.

Front 56

Q56. What is used to tie wire bundles in high-temperature areas?

Back 56

A56. High-temperature, pressure-sensitive tape.