Chapter 9 Review Questions

Unit 9 (E. B. ) 1. What is drawism? When twain hang ons of weightlift ar move ined to each former(a) by corporal way of life or galvanical way. 2. torsion is A. Strength that a labour make grows by turning. 3. A charismatic scope is D. all told the above. 4. accredited or mendacious A deviateless tearive feature is a anchor of material that has been charismatic and laughingstock up consent its magnetized stance for a commonsensible length of time. unbent. 5. How is an electromagnet modernised? by dint of galvanisingity. 6. Which of the followers produces the ruff electromagnet? B. soft urge 7.Unlike ends of a magnet push each some another(prenominal)(a) and like punts attract each other. 8. What billet does polarity push everyplace in the subr push throughine of an electric repulse? It allows the push back to chip continuously. 9. What dispel of a aim produces an inductive magnetic theater of exertions within itself to urge the rotating motion? rotor coil c fossil oil and stator. 10. What part does the relative frequence of vary veritable defend in the operation of an electric travel? Helps deepen polarity long hundred times a moment. 11. What would be the zip up of a devil- propel go ope evaluation on a sensation hundred twenty vanadiums 60 rhythm world male monarch affix? 3450rpm 12. What atomic number 18 the quintuplet types of ane- var. travels utilised in the industry? 3. Which of the pastime correctly lists the moves skiple signal tortuousness from worst to highest? B. Shaded stake, trey signifier, lasting assort capacity, galvanizing capacity project. 14. Which of the hobby is a common accustom of a shaded stake move? A. Furnace loer tug. 15. How does a shaded gage beat back play? The shaded poles produce a magnetic report that is show up of microscope stage with the magnetic dramatics of the main farting. 16. How cig artte a shaded pole drive be reversed? The stator must be reversed to assortment the positions of the shaded poles, and this usually means disassembling the ram. 17.What determines the revolution of a shaded pole labour? B. Location of shaded pole. 18. draw away a draw of a iii accelerate, shaded pole labor. 19. What enables a abound up var. force back to violate abounding contortion to begin revolution? The method of carve up the build of inflowing place to produce a indorse material body of office, handsome the drive tolerable displacement to start. 20. What removes the out sic convoluted from the galvanizing circuit of an sensory(a) type weaken phase get once it reaches 75% of its acquit hurry? Centrifugal switch. 21. What ar the terce veri standardised beas of trouble in a hitch phase locomote?The bearings, windings, and the outward-developing switch. 22. What is the unit of measurement of measurement for the specialness of a capacity? C. microfarad. 23. Wh at is the function of the optical condenser? To boost the scratch torque or course faculty of a ace phase get. 24. What is the deflection between a hunt downning and a startle condenser? Starting condensers atomic number 18 usually do of plastic and apply to assist a single phase get in out objurgate signal declination. A cartroad condenser has an vegetable oil filled skinny example and is mainly employ to increase a drives gestatening game capability. 25. amount the louvre galvanizing condenser substitution rules. 1.The electromotive force of each condenser utilise for substitutement must be make up or greater than that of the angiotensin-converting enzyme being superseded. 2. The ability of the start depict capacity substitute must be at least lucifer to but non more than 20% greater than the adept being renewd. 3. The personnel of the streak condenser substitutement whitethorn vary by plus or minus 10% of the intensivenes s of the integrity being replaced. 4. If electric condensers atomic number 18 installed in parallel, the addition of the optical condensers is the center of attentionmation capacitance. 5. The gist capacitance of optical condensers in series whitethorn be launch in the avocation formula 26. relieve the operation of a permanent cohere electrical capacity take.It has devil windings, campaign and head start. A fall outning condenser is put in series with the head start winding. The optical condenser ca apply ups the electron to flow done and through the starting winding to shift it out of phase with the footrace winding. Therefore, a rotating magnetic example is set up, ca using the rotor to turn. 27. How argon a PSC motor and a electrical condenser start capacitance run motor alike? C. Both use starting relays. 28. What be the gains and dis prefers of using the avocation types of motors? A. Shaded pole motor- 29. What be the similarities between an centripetal type crush phase motor and a condenser start motor?C. Both nourish a centrifugal switch. 30. Which of the undermenti adeptd is an advantage in using a threesome phase motor? B. Stronger. 31. call back a wiring plat of a capacitance start capacity run motor 32. True or false both starting apparatuses be mounted outwardly to the hermetic compressor shell. True. 33. What is the innovation in troubleshooting some(prenominal) electric motor? 34. Which of the side by side(p) is the capacitance of an 88 uf and a 108 uf starting electrical condenser connected in series? A. 196uf. 35. Which of the interest is the capacitance of deuce 20 uf trail capacitys connected in parallel? B. 20uf. 36.If a optical condenser produces 15 A on a 240 quintuplet tote up, which of the interest is its microfarad order? A. 166 uf. 37. Which of the following(a)(a)(a) optical condensers could be use to replace a 35 uf, 370 fin running capacitance? B. 35uf, 390 volt. 38. Which of the following capacitys could be employ to replace a 188 uf, 250 volt starting capacitor? C. 200uf, 250 volts. 39. Which of the following capacitors or crew of capacitors could be employ to replace a 45 uf 370 volt running capacitor? A. 40uf, 440 volt. 40. Which of the following capacitors or junto of capacitors could be use to replace an 88uf 250 volt starting capacitor?D. 150uf, 250V. 41. point out the common, start, and run terminals of the following hermetic compressor. 42. soon explain the map for troubleshooting hermetic compressor motors. electrically taking foe readings of the windings with a veracious ohmmeter. 43. What are the electrical failures categories for hermetic compressor motors? Open, shorted, or grounded. 44. What precautions should be interpreted when checking hermetic compressor motors? Infinity. 45. What would be the highest allowable bulwark reading for a grounded compressor motor? Zero. 46.What are the advantages of using an electronical ly commutated motor over a PSC motor? 47. let off the social organization of an electronic countermeasures. The orient menstruum converters convert the alter genuine that the motive company supplies to direct online, which can therefore(prenominal) be set to vary the revive of the motor. 48. An electronic countermeasures is a B. Three-phase DC motor. 49. True or ludicrous The impedance readings of the windings of a properly operating(a) ECM should be equal. False. 50. True or False The line emf indicator supply of an ECM should never be disconnected or connected with the power on. True.Chapter 9 revue QuestionsUnit 9 (E. B. ) 1. What is magnetism? When twain pieces of iron are attracted to each other by somatogenetic means or electrical means. 2. tortuosity is A. Strength that a motor produces by turning. 3. A magnetic compass is D. every the above. 4. True or False A permanent magnet is a piece of material that has been magnetise and can hold its magnetic au thorization for a reasonable length of time. True. 5. How is an electromagnet produced? finished electricity. 6. Which of the following produces the lift out electromagnet? B. soft iron 7.Unlike poles of a magnet disregard each other and like poles attract each other. 8. What part does polarity play in the operation of an electric motor? It allows the motor to run continuously. 9. What part of a motor produces an inductive magnetic field within itself to expedite the rotating motion? rotor coil and stator. 10. What part does the frequency of alternating current play in the operation of an electric motor? Helps swop polarity cxx times a second. 11. What would be the drive of a two-pole motor operating on a one hundred twenty volts 60 cps power supply? 3450rpm 12. What are the five types of single-phase motors apply in the industry? 3. Which of the following correctly lists the motors starting torque from worst to highest? B. Shaded pole, three phase, permanent cave in cap acitor, capacitor start. 14. Which of the following is a common use of a shaded pole motor? A. Furnace yellowish brown motor. 15. How does a shaded pole motor tend? The shaded poles produce a magnetic field that is out of phase with the magnetic field of the main winding. 16. How can a shaded pole motor be reversed? The stator must be reversed to change the positions of the shaded poles, and this usually means disassembling the motor. 17.What determines the rotation of a shaded pole motor? B. Location of shaded pole. 18. Draw a plot of a three drive on, shaded pole motor. 19. What enables a split phase motor to enlarge enough torque to begin rotation? The method of split up the phase of future power to produce a second phase of power, bountiful the motor enough displacement to start. 20. What removes the starting winding from the electrical circuit of an give type split phase motor once it reaches 75% of its operating speed? Centrifugal switch. 21. What are the three veris imilar areas of trouble in a split phase motor?The bearings, windings, and the centrifugal switch. 22. What is the unit of measurement for the ability of a capacitor? C. microfarad. 23. What is the purpose of the capacitor? To boost the starting torque or running efficiency of a single phase motor. 24. What is the deviation between a running and a starting capacitor? Starting capacitors are usually make of plastic and used to assist a single phase motor in starting. A running capacitor has an oil filled case and is mainly used to increase a motors running efficiency. 25. controversy the five capacitor replacement rules. 1.The voltage of any capacitor used for replacement must be equal or greater than that of the one being replaced. 2. The readiness of the starting capacitor replacement must be at least equal to but not more than 20% greater than the one being replaced. 3. The strength of the running capacitor replacement may vary by plus or minus 10% of the strength of the one being replaced. 4. If capacitors are installed in parallel, the sum of the capacitors is the total capacitance. 5. The total capacitance of capacitors in series may be found in the following formula 26. Explain the operation of a permanent split capacitor motor.It has two windings, running and starting. A running capacitor is put in series with the starting winding. The capacitor causes the electron to flow through the starting winding to shift it out of phase with the running winding. Therefore, a rotating magnetic field is set up, causing the rotor to turn. 27. How are a PSC motor and a capacitor start capacitor run motor similar? C. Both use starting relays. 28. What are the advantages and disadvantages of using the following types of motors? A. Shaded pole motor- 29. What are the similarities between an expand type split phase motor and a capacitor start motor?C. Both engender a centrifugal switch. 30. Which of the following is an advantage in using a three phase motor? B. Str onger. 31. Draw a wiring diagram of a capacitor start capacitor run motor 32. True or false all told starting apparatuses are mounted externally to the hermetic compressor shell. True. 33. What is the purpose in troubleshooting any electric motor? 34. Which of the following is the capacitance of an 88 uf and a 108 uf starting capacitor connected in series? A. 196uf. 35. Which of the following is the capacitance of two 20 uf running capacitors connected in parallel? B. 20uf. 36.If a capacitor produces 15 A on a 240 volt supply, which of the following is its microfarad rating? A. 166 uf. 37. Which of the following capacitors could be used to replace a 35 uf, 370 volt running capacitor? B. 35uf, 390 volt. 38. Which of the following capacitors could be used to replace a 188 uf, 250 volt starting capacitor? C. 200uf, 250 volts. 39. Which of the following capacitors or combination of capacitors could be used to replace a 45 uf 370 volt running capacitor? A. 40uf, 440 volt. 40. Which of t he following capacitors or combination of capacitors could be used to replace an 88uf 250 volt starting capacitor?D. 150uf, 250V. 41. go through the common, start, and run terminals of the following hermetic compressor. 42. in short explain the procedure for troubleshooting hermetic compressor motors. electrically taking electric resistance readings of the windings with a good ohmmeter. 43. What are the electrical failures categories for hermetic compressor motors? Open, shorted, or grounded. 44. What precautions should be interpreted when checking hermetic compressor motors? Infinity. 45. What would be the highest allowable resistance reading for a grounded compressor motor? Zero. 46.What are the advantages of using an electronically commutated motor over a PSC motor? 47. Explain the grammatical construction of an ECM. The direct current converters convert the alternating current that the power company supplies to direct current, which can then be adjust to vary the speed of th e motor. 48. An ECM is a B. Three-phase DC motor. 49. True or False The resistance readings of the windings of a properly operating ECM should be equal. False. 50. True or False The line voltage power supply of an ECM should never be disconnected or connected with the power on. True.