NEETS MODULE 3 CHAPTER 1CIRCUIT MEASUREMENT
Q1. What are two ways that circuit measurement is used?
Q2. Why are in-circuit meters used?
Q3. What is one advantage of an out-of-circuit meter when it is compared with an in-circuit meter?
Q4. How does a compass react when placed close to a current carrying conductor?
Q5. If the amount of current in the conductor changes, what happens to the magnetic field around theconductor?
Q6. How does the compass needle react to a decreased magnetic field?
Q7. What type of meter movement is the d’Arsonval meter movement?
Q8. What is the effect of current flow through the coil in a d’Arsonval meter movement?
Q9. What are three functions of the hairsprings in a d’Arsonval meter movement?
Q10. How would a compass react when placed close to a conductor carrying alternating current at alow frequency?
Q11. How would the compass react if the alternating current through the conductor was a high frequency?
Q12. What is the purpose of a rectifier in a meter?
Q13. How can a d’Arsonval meter movement be adapted for use as an ac meter?
Q14. What is damping?
Q15. What are two methods used to damp a meter movement?
Q16. What value does a meter movement react to (actually measure) when measuring ac?
Q17. What value is indicated on the scale of an ac meter?
Q18. List three meter movements that can measure either ac or dc without the use of a rectifier.
Q19. What electrical property is used by all the meter movements discussed so far?
Q20. What electrical property does an ammeter measure?
Q21. How is an ammeter connected to the circuit under test?
Q22. How does an ammeter affect the circuit being measured?
Q23. How is the ammeter’s effect on the circuit being measured kept to a minimum?
Q24. What is ammeter sensitivity?
Q25. What is used to allow an ammeter to measure different ranges?
Q26. Why should you use the highest range of an ammeter for the initial measurement?
Q27. What range of an ammeter is selected for the final measurement?
Q28. List the six safety precautions for the use of ammeters.
Q29. Why will an ammeter be damaged if connected in parallel with the circuit to be measured?
Q30. What electrical quantity is measured by a voltmeter?
Q31. How is a voltmeter connected to the circuit to be measured?
Q32. What is the loading effect of a voltmeter?
Q33. How is the loading effect of a voltmeter kept to a minimum?
Q34. How is it possible to use a current sensitive meter movement to measure voltage?
Q35. What is voltmeter sensitivity?
Q36. What method is used to allow a voltmeter to have several ranges?
Q37. Why should you always use the highest range when connecting a voltmeter to a circuit?
Q38. What type of meter movement reacts to voltage rather than current?
Q39. What is the only use for the voltage sensitive meter movement?
Q40. List the six safety precautions for the use of voltmeters
Q41. What electrical quantity is measured by an ohmmeter?
Q42. What other measurement can an ohmmeter make?
Q43. How is a series-type ohmmeter connected to the circuit being measured?
Q44. What is used to provide the ohmmeter with several ranges?
Q45. What area of an ohmmeter scale should be used when measuring circuits?
Q46. What are the two types of ohmmeters?
Q47. What is the most obvious difference between the two types of ohmmeters?
Q48. List the four safety precautions observed when using ohmmeters
Q49. What is the primary use of a megger?
Q50. What is the procedure for using a megger to check the insulation of a conductor?
Q51. What is a normal indication on a megger when checking insulation?
Q52. List the four safety precautions observed when using a megger
Q53. What is a multimeter?
Q54. Why is a multimeter preferred over separate meters?
Q55. How is a multimeter changed from a voltage measuring device to a resistance measuring device?
Q56. Why is the dc scale on a multimeter different than the ac scale?
Q57. What is the reason for having a mirror on the scale of a multimeter?
Q58. How is the mirror on a multimeter used?
Q59. List the 11 safety precautions for multimeters.
Q60. Why would you use a hook-on voltameter instead of a multimeter?
Q61. What electrical quantity is measured by a wattmeter?
Q62. What electrical quantity is measured by a watt-hour meter?
Q63. What is the quantity shown on the watt-hour meter in figure 1-46?
Q64. What are two types of frequency meters?
Q65. What type of meter is shown and what is the value of the quantity being measured for each meter infigure1-49?
Q66. What meter reading is shown on each multimeter in each part of figure 1-50?
Q67. Which part of figure1-50 shows the switch positions the multimeter should be left in when the meteris secured?
Q68. What type of meter is shown and what is the value of the quantity being measured for each meter infigure 1-51?
Q69. If the insulation of a conductor was being measured in figure1-51 (A), would the reading indicate agood insulation?
Q70. What type of frequency meter is shown and what is the value indicated for each meter in figure1-52?
NEETS MODULE 3 CHAPTER 2 CIRCUIT PROTECTION DEVICES
Q1. Why are circuit protection devices necessary?
Q2. What are the three conditions that require circuit protection?
Q3. What is a direct short?
Q4. What is an excessive current condition?
Q5. What is an excessive heat condition?
Q6. How are circuit protection devices connected to the circuit they are intended to protect and whyare they connected in this way?
Q7. What are the two types of circuit protection devices?
Q8. Label the schematic symbols shown in figure 2-3 below.
Q9. Label the fuses shown in figure 2-6 according to type
Q10. Identify the open fuses shown in figure 2-6.
Q11. In what three ways are fuses rated?
Q12. What does the current rating of a fuse indicate?
Q13. What does the voltage rating of a fuse indicate?
Q14. What are the three time delay ratings of fuses?
Q15. Give an example of a device you could protect with each type of time delay fuse
Q16. What are the voltage, current, and time delay ratings for a fuse with the designation A
Q16. What are the voltage, current, and time delay ratings for a fuse with the designation B
Q17. What are the voltage and current ratings for a fuse designated A
Q17. What are the voltage and current ratings for a fuse designated B
Q18. What is the new military designation for a fuse with the old military designation F05A20ROB?
Q19. Label the fuseholders in figure 2-12.
Q20. Which connector should you use to connect the (a) power source and (b) load to the fuseholdershown in figure 2-12(A)?
Q21. What are three methods for determining if a fuse is open?
Q22. You have just checked a fuse with an ohmmeter and find that the fuse is shorted. What should youdo?
Q23. You have just checked a 1/500-ampere fuse with an ohmmeter and find it is open. Checking thereplacement fuse shows the replacement fuse is open also. Why would the replacement fuseindicate open?
Q24. How could you check a 1/500-ampere fuse with an ohmmeter?
Q25. List the safety precautions to be observed when checking fuses.
Q26. You have removed an open fuse from a fuseholder and repaired the cause of the fuse opening. Theparts list specifies a fuse coded F02BI25VñA. There are no fuses available with that identification.In the following list, indicate if the fuse is a direct replacement, a good substitute, or notacceptable. For the fuses that are good substitutes, number them in order of preference and explainwhy they are numbered that way. If the fuse is not acceptable, explain why.(a) F03BI25V½A
Q26 (b) F02BI25V $(c)
Q26 (c) F02GR500B
Q26 (d) F02B32V½A
Q26 (e) F02DR500B
Q26 (f) F02A250V $
Q26 (g) F02AI25V½A
Q27. What two things should you check before replacing a fuse?
Q28. List the safety precautions to be observed when replacing a fuse
Q29. What conditions should you check for when conducting preventive maintenance on fuses?
Q30. What are the five main components of a circuit breaker?
Q31. What are the three types of circuit breaker trip elements?
Q32. How does each type of trip element react to an overload?
Q33. What is a trip-free circuit breaker?
Q34. What is a nontrip-free circuit breaker?
Q35. Where should you use a trip-free circuit breaker?
Q36. Where should you use a nontrip-free circuit breaker?
Q37. What are the three time delay ratings for circuit breakers?
Q38. What is selective tripping and why is it used?
Q39. If the power distribution system shown in figure 2-22 uses selective tripping, what is the time delay rating for each of the circuit breakers shown?
Q40. What factors are used to select a circuit breaker?
Q41. What type of circuit breaker is used on a multimeter?
Q42. What steps are to be taken before beginning work on a circuit breaker?
Q43. What items are you to check when working on a circuit breaker?
NEETS MODULE 3 CHAPTER 3 CIRCUIT CONTROL DEVICES
Q1. What are three reasons circuit control is needed?
Q2. What are the three types of circuit control devices?
Q3. Label the schematic symbols shown in figure 3-2.
Q4. What is the difference between a manual and an automatic switch?
Q5. What is one example of a manual switch?
Q6. What is one example of an automatic switch?
Q7. Why are multicontact switches used?
Q8. Label the schematic symbols shown in figure 3-4 as to number of poles and number of throws.
Q9. Label the switch schematics shown in figure 3-10A through 3-10G
Q10. What classification of a switch is used when you describe it as a rocker switch?
Q11. In describing a switch by the number of positions of the actuator, what are the two possible configurations for a single-pole, double-throw switch?
Q12. What type of switch should be used to control a circuit that requires a temporary actuation signal?
Q13. What type of switch is used if it is necessary to guard against a circuit being accidentally turnedon or off?
Q14. What is the common name used for an accurate snap-acting switch?
Q15. What is the current rating of a switch?
Q16. What is the voltage rating of a switch?
Q17. What two types of meters can be used to check a switch?
Q18. If a switch must be checked with power applied, what type of meter is used?
Q19. A double-pole, double-throw, single-break, three-position, toggle switch is faulty. This switch has a momentary position 1 and is locked out opposition 3. The voltage and current ratings for the switch are 115 volt dc, 5 amperes. No direct replacement is available. From switches A through I,in table 3-1, indicate if the switch is acceptable or not acceptable as a substitute. Of the acceptable switches, rank them in order of choice. If the switch is unacceptable, give the reason
Q20. What should you check when performing preventive maintenance on a switch?
Q21. What is the operating principle of a solenoid?
Q22. What is one example of the use of a solenoid?
Q23. If a solenoid is not operating properly, what items should be checked?
Q24. What is the operating principle of a relay?
Q25. How does a relay differ from a solenoid?
Q26. What are the two classifications of relays?
Q27. How can you determine if a relay is operating (changing from one position to the other)?
Q28. What items should be checked on a relay that is not operating properly?
Q29. What is used to clean the contacts of a relay?
Q30. What tool is used to set contact clearances on a relay?
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