NEETS MODULE 4 CHAPTER 1 ELECTRICAL CONDUCTORS
Q1. State the reason for the establishment of a "unit size" for conductors
Q2. Calculate the diameter in MILS of a conductor that has a diameter of 0.375 inch.
Q3. Define a mil-foot
Q4. Define a square mil as it relates to a square conductor.
Q5. Define a circular mil.
Q6. What is the circular mil area of a 19-strand conductor if each strand is 0.004 inch?
Q7. Define specific resistance
Q8. List the three factors used to calculate resistance of a particular conductor in ohms.
Q9. Using table 1-2, determine the resistance of 1,500 feet of AWG 20 wire at 25º C.
Q10. When using an American Standard Wire Gauge to determine the size of a wire, where shouldyou place the wire in the gauge to get the correct measurement?
Q11. List the four factors you should use to select wire for a specified current rating.
Q12. What are three types of nonmetallic insulating materials that can be used in a high-temperatureenvironments?
Q13. State why it is important for you to consider the ambient (surrounding) temperature of aconductor when selecting wire size.
Q14. State two advantages of using aluminum wire for carrying electricity over long distances.
Q15. State four advantages of copper over aluminum as a conductor
Q16. Define the temperature coefficient of resistance
Q17. What happens to the resistance of copper when it is heated?
Q18. Compare the resistance of a conductor to that of an insulator
Q19. State two fundamental properties of insulating materials.
Q20. Define insulation resistance.
Q21. Define dielectric strength
Q22. How is the dielectric strength of an insulator determined?
Q23. What is the purpose of coating a copper conductor with tin when rubber insulation is used?
Q24. What safety precaution should you take when working with extruded polytetrafluoroethyleneinsulated wiring?
Q25. State the reasons that the Navy is getting away from the use of asbestos insulation
Q26. State what happens to the insulating characteristics of asbestos when it gets wet.
Q27. What are the most common insulators used for extremely high voltages?
Q28. What is the common name for enamel-insulated wire?
Q29. If a cable is installed where it receives rough treatment, what should be added?
Q30. How many categories of nonmetallic protective coverings are there?
Q31. What is the most common type of nonmetallic material used to protect wires and cables?
Q32. What are the most common types of fibrous tape?
Q33. What materials are commonly used as cushions between cable insulation and metallic armor?
Q34. What are the two types of metallic protection?
Q35. What are the three types of lead-sheathed cables?
Q36. What are the three examples of metallic armor cable that were discussed?
NEETS MODULE 4 CHAPTER 2WIRING TECHNIQUES
Q1. What are the basic requirements for any splice or terminal connection?
Q2. What is the preferred method for stripping wire?
Q3. What stripping tool would NOT be used to strip glass braid insulation?
Q4. What tool should be used to strip aluminum wire?
Q5. Why are the ends of the wire clamped down after a Western Union splice is made?
Q6. Why are splices staggered on multiconductor cables?
Q7. Where is the rattail joint normally used?
Q8. Which type of splice is used to splice a lighting fixture to a branch circuit?
Q9. Which of the splices discussed is NOT a butted splice?
Q10. Why is friction tape used in splicing?
Q11. What is a major advantage of the crimped terminal over the soldered terminal?
Q12. What are the two types of insulation most commonly used for noninsulated splices and terminallugs?
Q13. What is the maximum allowable temperature that should be used on heat-shrinkable tubing?
Q14. What is the maximum allowable source pressure that can be used with the compressorair/nitrogen heating tool?
Q15. Should aluminum wire be cleaned prior to installing an aluminum terminal lug or splice?
Q16. What tools should be used to install large aluminum terminal lugs and splices?
Q17. Why should a lockwasher never be used with an aluminum terminal?
Q18. What is the most common method of terminating and splicing wires?
Q19. Besides not having to insulate a noninsulated terminal, what other advantage is gained by usinga preinsulated terminal lug?
Q20. Why are preinsulated terminal lugs and splices color coded?
Q21. Why must items to be soldered be cleaned just prior to the soldering process?
Q22. What does "tinning" mean in relationship to soldering?
Q23. Why should wire be stripped 1/32 inch longer than the depth of the solder barrel?
Q24. How much of the stripped length of a conductor should be tinned?
Q25. What causes a "fractured solder" joint?
Q26. Define thermal inertia.
Q27. Why are small-wattage soldering irons not used to solder large conductors?
Q28. State why a well-designed soldering iron is self-regulating.
Q29. What should be done to a soldering iron tip that is pitted?
Q30. What happens if a soldering gun switch is pressed for periods longer than 30 seconds?
Q31. What causes the nuts or screws that hold the tips on soldering irons and guns to loosen?
Q32. A soldering gun should NOT be used on what components?
Q33. What is an advantage of using a resistance soldering iron when soldering wire to a connector?
Q34. Why is steel wool NEVER used as an abrasive to clean soldering tools?
Q35. Why should "antiseize" compound be used on the screw-in tips of the pencil iron?
Q36. If no suitable tip is available for a particular job, how may one be improvised?
Q37. What two metals are used to from soft solder?
Q38. Define the metal solvent action that takes place when copper conductors are soldered together.
Q39. What is the tin-lead alloy percentage of solder used for electrical connectors, splices, andterminal lugs?
Q40. What purpose does flux serve in the soldering process?
Q42. Why are solvents used in the soldering process?
Q43. What is the purpose of a heat shunt?
Q44. Besides presenting a neat appearance and supporting each other, what is the other purpose forlacing conductors?
Q45. Why is flat tape preferred instead of round cord when wire bundles are laced?
Q46. What amount of flat tape or round cord is required to single lace a group of conductors?
Q47. What is the purpose of a lacing shuttle?
Q48. When should wires be twisted prior to lacing?
Q49. What precautions should you take when tying bundles containing coaxial cables?
Q50. How is the single lace started?
Q51. What size wire bundles require double lace?
Q52. How is the double lace started?
Q53. How are laced cable groups bound together?
Q54. When are spot ties used?
Q55. What is used to install self-clinching cable straps?
Q56. What is used to tie wire bundles in high-temperature areas?
NEETS MODULE 4 CHAPTER 3 SCHEMATIC READING
Q1. Why must cables and wires be identified?
Q2. Where would you find the wire identification system for a specific piece of equipment?
Q3. What does the cable number identify?
Q4. If a wire passes through a connector what portion of the aircraft wire identification numberchanges?
Q5. What markings are found on spaghetti sleeving?
Q6. What is the purpose of the green conductor in a power tool or electrical appliance cable?
Q7. What type of electrical diagram is used to identify the components of a system?
Q8. What type of diagram is used to find the location of a component?
Q9. What types of diagrams are the most convenient from which to learn the basic Functions of a circuit?
Q10. What type of diagram is the most useful in learning the overall operation of a system?
Q11. Refer to the schematic diagram in figure 3-10. If the ignition switch is placed in the ON positionand all the engine instruments operate properly except the gas gauge, where would the faultprobably be?
Q12. If the fuse shown on the schematic (figure 3-10) opens, what lights will operate?
Q13. What type of diagram is the most detailed?
Q14. Why must a wiring diagram be used in conjunction with a schematic to troubleshoot a system?
Q15. What type of diagram would be most useful for wiring a relay into a circuit?
Q16. What safety precaution must you observe when soldering or hot-wire stripping fluoroplasticinsulated wire?
Q17. What must be used to test an activated circuit?
Q18. How should excess solder be removed from a hot soldering iron?
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