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  • TEC TRIMIX DIVER EXAMS Versions A & B IMPORTANT Do not write in this booklet. Please use the separate answer sheet provided. You may use a pen or pencil, scrap paper and the tables in the Tec Trimix Diver Manual and the Tec Deep Diver Manual appendices. © International PADI, Inc., 2003 Produced by Diving Science and Technology (DSAT) All rights reserved, including the right of reproduction in whole or in part in any form. Printed in U.S.A. Published and Distributed by Professional Association of Diving InstructorsProduct No. 70434 Version 1.0 (06/03) 010PDF3
  • Tec Trimix Diver Exam VERSION ATec Trimix Diver Examination VERSION A sis is actually 17.5 percent. The normal action would Please use the separate answer sheet. Do not write be in this exam book. You may use a pen or pencil, scrap paper and the tables in the Tec Trimix Diver Manual a. to have the blender add oxygen to adjust the and the Tec Deep Diver Manual appendices. mix. b. to drain the cylinders completely and reblend from scratch. c. to add 10 percent to all your deco times. 1. Your potential risks as a Tec Trimix Diver include d. to dive the mix as planned. a. helium is less forgiving of procedural errors. b. difficult or impossible to be rescued. 7. All cylinders used in a trimix dive should be clearly marked with c. hypoxia. d. All of the above. a. the gas, analyzed content, dive date and team name. 2. The Tec Trimix Diver certification qualifies you to ini- b. the gas, diver’s name, dive date and maximum tially dive to a maximum of depth. a. 60 metres/200 feet or the maximum depth you c. the diver’s name, dive date, maximum depth and reached in training. analyzed content. b. 75 metres/245 feet or the maximum depth d. the gas, diver’s name, analyzed content and maxi- you reached in training. mum depth. c. 90 metres/300 feet or the maximum depth you 8. When you wear four cylinders, where you wear the reached in training. gases on a particular dive should d. 100 metres/330 feet or the maximum depth you reached in training. a. depend on the gases you’re using. b. always follow your personal standard configura- 3. Which is not one of the benefits of diving with trimix? tion. a. less heat lost into breathing gas. c. vary based on your mood. b. less dense for easier breathing. d. None of the above. c. reduced narcosis. 9. You can’t generally put trimix in your dry suit because d. reduced oxygen toxicity. a. helium conducts heat too rapidly to effectively in- 4. Compared to the same dive being made with air and sulate you. the same deco gases, for a typical technical dive a b. doing so poses a risk of isobaric counterdiffusion. trimix dive will c. Both a and b. a. have longer decompression. d. None of the above. b. have no decompression. 10. An argon inflation system has c. have less decompression. d. have reversed decompression. a. no second stage. b. an over pressure relief valve. 5. According to the broad community standard, trimix c. a label clearly marking it as argon. is considered mandatory for all diving deeper than d. All of the above. a. 30 metres/100 feet b. 50 metres/165 feet 11. When wearing two cylinders on each side, the con- vention is c. 55 metres/185 feet d. 60 metres/200 feet a. right rich, left lean. b. left loaded, right reduced. 6. You’ve planned your dive based on diving with c. left bottom low, right bottom second lowest. TMx18/50. Upon analysis, you find your oxygen analy- d. None of the above. 2
  • Tec Trimix Diver Exam VERSION A12. The procedure you should follow to prevent switch- 19. After certification, simulation ing to the wrong gas is a. remains a useful learning tool. a. the NO TOX gas switch. b. has little real application. b. not specified. c. applies only to beginners. c. not crucial to follow if you know what you’re d. can interfere with planning an effective mission. doing. d. None of the above. 20. A fullface mask suited to tec diving should offer a. use of standard second stages.13. Compared to nitrogen, diving with helium is _______ b. special switch blocks for gas routing. _____________ tolerant of poor depth management during decompression. c. ease of complete removal for gas switches. d. All of the above. a. less b. more 21. The primary advantages of diving with a multigas c. as trimix computer include d. None of the above. a. that it is far less costly than a standard air computer. b. that it assumes you spend the entire dive at the14. Neo-Haldanean models deepest depth. a. assume that if there’s no DCS, all inert gas remains c. that it prevents you from breathing too fast. in solution. d. None of the above. b. use a deco strategy that gets the diver as shallow as possible as fast as possible. 22. When planning dives with a multigas trimix computer c. Both a and b. a. you will not need desktop deco software. d. None of the above. b. you will use desktop deco software.15. Even using desktop deco software, to determine c. you only need desktop deco software if you have your gas volume requirements on a trimix dive you’ll only one multigas computer. have to manually determine d. There’s not enough information to answer the question. a. your oxygen exposure. b. your partial pressure of oxygen. 23. To backup a multigas trimix computer c. your decompression schedule. a. you can rely on your teammate’s computer. d. your SAC rates. b. you can use backup tables with a depth gauge and timer.16. Team diving reduces accidents by c. you can use the computer’s auto-backup mode. a. providing a “backup brain.” d. None of the above. b. providing your reserve gas so you don’t have to. c. keeping you from doing dives that have any risk. 24. Helium d. All of the above. a. dissolves in lipids more readily than oxygen and nitrogen.17. Compatible gases benefit a team by b. is denser than oxygen and nitrogen. a. making it unnecessary to ever share gas in an c. diffuses more rapidly than oxygen and nitrogen. emergency. d. conducts heat more slowly than oxygen and ni- b. eliminating the “backup brain” aspect of team div- trogen. ing. c. helping keep the team together. 25. An advantage of helium as a dive gas is d. All of the above. a. that it is cheaper than air. b. it is non narcotic at depth.18. When using A Good Diver’s Main Objective Is To Live c. it can cause HPNS. to plan a trimix dive, “Diver’s” is the recall word for d. it insulates better than air. a. depth. b. direction. c. deep stop. d. decompression. 3
  • Tec Trimix Diver Exam VERSION A26. A disadvantage of helium as a dive gas is 33. You typically use a travel gas when a. its high density. a. your decompression gases cannot be used shal- b. it can cause oxygen toxicity. lower than 30 metres/100 feet. c. it can cause you to overheat in your dry suit. b. your bottom mix has less than 21 percent oxygen. d. None of the above. c. your bottom mix is narcotic above 30 metres/ 100 feet.27. Switching to a trimix high in helium (more than 20 d. your bottom mix has less than 16 percent oxygen. percent) during ascent or decompression after diving with air or enriched air poses a theoretical risk of 34. When making a repetitive dive after a trimix dive a. isobaric counterdiffusion. a. make the next dive to the same depth or shallower. b. HPNS. b. oxygen is generally the same or higher. c. nitrogen narcosis. c. avoid using air or enriched air for the repetitive d. CNS oxygen toxicity. dive bottom gas. d. All of the above.28. Inflating your dry suit with trimix can cause a decom- pression problem due to 35. (Metric) You’re ascending from a dive using a multi- a. isobaric counterdiffusion. gas trimix computer that doesn’t calculate deep stops. You’re leaving a depth of 54 metres and the b. transdermal narcosis. computer shows your first stop as 30 metres. Using c. heat transfer capillary constriction. the Deep Stop Calculation Table, what would your d. None of the above. first two deep stops be assuming the 30 metre stop doesn’t clear after the first deep stop.29. (Metric) Using the Equivalent Narcotic Depth Table, _____________________________ what is the END for 50 metres when diving TMx18/33? ____________________________________________ 35. (Imperial) You’re ascending from a dive using a multigas trimix computer that doesn’t calculate deep29. (Imperial) Using the Equivalent Narcotic Depth Table, stops. You’re leaving a depth of 180 feet and the what is the END for 165 feet when diving TMx18/33? computer shows your first stop as 100 feet. Using the ____________________________________________ Deep Stop Calculation Table, what would your first two deep stops be assuming the 100 foot stop30. Considerations in selecting a trimix for a dive include doesn’t clear after the first deep stop. a. decompression issues. _____________________________ b. narcosis. 36. Which gas do you generally use at the first deep stop? c. logistics. d. All of the above. a. your deepest decompression gas b. your travel gas31. (Metric) Using the appropriate tables, what is the c. your second deepest decompression gas “ideal” trimix for a dive to 60 metres? d. None of the above. ____________________________________________ 37. What is the minimum duration and interval for an air31. (Imperial) Using the appropriate tables, what is the break? “ideal” trimix for a dive to 200 feet? a. 5 minutes every 8 minutes ____________________________________________ b. 5 minutes every 15 minutes c. 5 minutes every 20 minutes32. Which of the following would not be considered a d. 5 minutes every 30 minutes hypoxic trimix? a. TMx10.5/50 38. The theoretical benefit of having a small amount of b. TMx14/33 helium in your decompression gas is c. TMx18/50 a. that it may reduce bubble formation. d. TMx21/20 b. that it helps you retain heat. c. that it reduces the cost of your deco gases. d. All of the above. 4
  • Tec Trimix Diver Exam VERSION A39. One way to help control your ascent is to and 6 minutes at 9 metres/30 feet, followed by 4 a. keep your rate smooth by eliminating unnecessary minutes on oxygen at 6 metres/20 feet and 20 min- stops. utes at 5 metres/15 feet. You’re ascending from the b. watch your smallest bubbles instead of your 21 metre/70 foot stop when you lose control of your depth gauge/computer. buoyancy and rise to the surface. You have no DCS symptoms and return to depth within 5 minutes. c. ascend as fast as possible to the first stop, then What should your decompression schedule and extend it by the ascent time. gases be now? d. stop or pause each 3 metres/10 feet as you as- _____________________________ cend to the first stop.40. At the beginning of a dive requiring travel gas 46. If you experience CNS symptoms underwater, you should stay on low oxygen gas a. start by breathing back gas at the surface until ready to descend. a. for at least 15 minutes. b. teammates confirm that everyone’s breathing the b. for at least 15 minutes after all symptoms subside. correct gas before descending. c. regardless of how it affects your decompression. c. Both a and b. d. You should not be on low oxygen gas. d. None of the above. 47. Carbon dioxide buildup41. If you lose your deco gases on a trimix dive a. can increase your breathing rate. a. your options may be none or very limited. b. can offset narcosis. b. support divers, if available, may be able to bring c. is not a realistic problem in trimix diving. down more. d. is usually an issue at the surface, not underwater. c. you may be able to use teammates’ gas if they didn’t lose theirs. 48. The primary mission of a trimix dive d. All of the above. a. is for the entire team to return unhurt. b. depends upon the mission focus.42. If your multigas trimix computer fails during a dive c. cannot be predicted in advance. a. you can use a backup multigas trimix computer to d. None of the above. abort the dive. b. you can use backup tables, depth gauge and 49. Your responsibilities as a trimix diver include timer to abort the dive. a. accepting the risks of tec and trimix diving. c. Both a and b. b. quitting if your physical or mental health requires it. d. None of the above. c. being patient in expanding your limits.43. Support divers can be especially beneficial on trimix d. All of the above. dives 50. The safest course with respect to avoiding crush a. by providing extra deco gas if necessary. depth is b. by shuttling unneeded equipment to the surface. a. test dive all equipment to twice the expected use c. by standing by to lend assistance as needed. depth. d. All of the above. b. use nothing that has an air space in it. c. stay within the manufacturer’s depth rating.44. Your responsibilities as a Tec Trimix Diver include d. All of the above. a. not allowing new dive technology, medicine or decompression theory to influence you. b. diving only with the same team. c. bringing up less experienced divers. d. All of the above.45. You’re decompressing from a dive with TMx18/33 to 60 metres/200 feet. After the deep stops, your schedule calls for EANx50 for 1 minute at 21 me- tres/70 feet, 2 minutes at 18 metres/60 feet, 2 minutes at 15 metres 50 feet, 4 minutes at 12 metres/40 feet 5
  • TEC TRIMIX DIVER EXAM Version B IMPORTANT Do not write in this booklet. Please use the separate answer sheet provided. You may use a pen or pencil, scrap paper and the tables in the Tec Trimix Diver Manual and the Tec Deep Diver Manual appendices. © International PADI, Inc., 2003 Produced by Diving Science and Technology (DSAT)All rights reserved, including the right of reproduction in whole or in part in any form. Printed in U.S.A. Published and Distributed by Professional Association of Diving Instructors 7
  • Tec Trimix Diver Exam VERSION BTec Trimix Diver Examination VERSION B 6. When analyzing trimix, your blend should be within Please use the separate answer sheet. Do not write plus or minus _____ percent of the intended oxygen in this exam book. You may use a pen or pencil, scrap content. paper and the tables in the Tec Trimix Diver Manual and the Tec Deep Diver Manual appendices. a. 3 b. 2 c. 1 d. 0.5 1. Your potential risks as a Tec Trimix Diver include: a. gas blend inaccuracy. 7. All cylinders used in a trimix dive should be clearly marked with b. difficult or impossible to be rescued. a. the gas, analyzed content, dive date and team c. isobaric counterdiffusion. name. d. All of the above. b. the gas, diver’s name, analyzed content and maximum depth. 2. The Tec Trimix Diver certification qualifies you to ini- tially dive to a maximum of c. the diver’s name, dive date, maximum depth and analyzed content. a. 75 metres/245 feet or the maximum depth you d. the gas, diver’s name, dive date and maximum reached in training. depth. b. 90 metres/300 feet or the maximum depth you reached in training. 8. You may choose to wear four cylinders all left or right c. 100 metres/330 feet or the maximum depth you and left, but either way you should reached in training. a. have oxygen on the left side. d. None of the above. b. have and maintain a personal standard in your configuration. 3. Which of the following is a normoxic trimix? c. switch them all to the left side for decompression. a. TMx18/50 d. All of the above. b. TMx21/33 c. TMx14/33 9. You can’t generally put trimix in your dry suit because d. TMx10.5/50 a. doing so unnecessarily drains your gas supply. b. helium conducts heat too rapidly to effectively 4. Within typical tec diving limits for a comparable insulate you. air/enriched air dive, depth, oxygen content and c. Both a and b. deco gases being the same, a trimix dive d. None of the above. a. requires less decompression. b. requires the same decompression. 10. Argon is the preferred dry suit insulation gas because c. requires more decompression. a. it is inexpensive. d. you cannot predict the effect on decompression. b. it has low density. c. it is safe to breathe at depth. 5. According to the broad community standard, trimix d. it insulates better than trimix, air or enriched air. is considered mandatory for all overhead environ- ment dives or complex environment dives deeper 11. When wearing all cylinders on the left, the convention than is a. 30 metres/100 feet a. breathe the bottom cylinder. b. 40 metres/130 feet b. move the cylinder you’re breathing to the right c. 50 metres/165 feet side. d. 60 metres/200 feet c. the cylinder you’re breathing is always on top. d. None of the above. 8
  • Tec Trimix Diver Exam VERSION B 12. The procedure you should follow to prevent switch- 19. Simulation ing to the wrong gas is a. is an effective learning tool before and after certi- a. the NO TOX gas switch. fication. b. not specified. b. is not directly applicable to trimix diving. c. not crucial to follow if you know what you’re c. is useful for training, but not beyond training. doing. d. All of the above. d. None of the above. 20. The primary advantage of using an appropriate 13. You should try to vary no more than __________ from tec diving fullface mask on a trimix dive is your decompression stop depth. a. that it keeps your face warm. a. .3 metres/1 foot b. it may reduce your risk of drowning if you have a b. .6 metres/2 feet CNS oxygen convulsion. c. 1 metre/ 3 feet c. it reduces your gas consumption. d. 2 metres/6 feet d. All of the above. 14. Bubble models 21. The primary advantages of diving with a multigas a. assume that if there’s no DCS, all inert gas remains trimix computer include in solution. a. that it is far less costly than a standard air computer. b. use a deco strategy that gets the diver as shallow b. that it assumes you spend the entire dive at the as possible as fast as possible. deepest depth. c. Both a and b. c. that it simplifies handling some emergency situa- d. None of the above. tions. d. All of the above. 15. Determining your gas volume requirements on a trimix dive 22. When planning dives with a multigas trimix computer a. varies significantly from those used for air/en- a. you will use desktop deco software. riched air technical diving. b. you will not need desktop deco software. b. does not require a SAC rate. c. you only need desktop deco software if you have c. cannot be calculated by desktop deco software. only one multigas computer. d. None of the above. d. There’s not enough information to answer the question.16. Team diving has a greater likelihood of a. accidents. 23. To backup a multigas trimix computer b. decompression requirements. a. you can use back up tables in the computer’s fail- ure mode. c. discovery. b. you can use a second multigas trimix computer. d. mission success. c. you can rely on your teammate’s computer 17. Compatible gases benefit a team by d. None of the above. a. making it easier to share gas in an emergency. 24. Helium b. assisting the “backup brain” aspect of team div- ing. a. dissolves in lipids more readily than oxygen and nitrogen. c. helping keep the team together. b. is denser than oxygen and nitrogen. d. All of the above. c. diffuses more slowly than oxygen and nitrogen. 18. When using A Good Diver’s Main Objective Is To Live d. conducts heat more rapidly than oxygen and to plan a trimix dive, “Objective” is the recall word for nitrogen. a. objective. 25. An advantage of helium as a dive gas is b. orientation. a. that it is cheaper than air. c. origination point. b. it is easier to breathe at depth. d. oxygen. c. it can cause HPNS. d. it insulates better than air. 9
  • Tec Trimix Diver Exam VERSION B26. A disadvantage of helium as a dive gas is 33. If your bottom gas has less than 16 percent oxygen, a. its high density. you will need b. it may be less forgiving of decompression errors. a. a travel gas. c. it can cause you to overheat in your dry suit. b. a dry suit. d. All of the above. c. to make deep stops. d. None of the above.27. Isobaric counterdiffusion is caused when a. a rapidly diffusing gas dissolves into body tissues 34. Using desktop deco software, you may calculate faster than a slowly diffusing gas dissolves out. deep stops b. a slowly diffusing gas dissolves out of body tissues a. by having the software generate them automatically. faster than a rapidly diffusing gas dissolves in. b. by using a bubble model if available in your soft- c. a slowly diffusing gas dissolves into body tissues ware. faster than a rapidly diffusing gas dissolves out. c. by calculating them and entering them manually as d. None of the above. waypoints. d. All of the above.28. Inflating your dry suit with trimix can cause a decom- pression problem due to 35. (Metric) You’re ascending from a dive using a multi- a. isobaric counterdiffusion. gas trimix computer that doesn’t calculate deep b. transdermal narcosis. stops. You’re leaving a depth of 48 metres and the computer shows your first stop as 36 metres. Using c. heat transfer capillary constriction. the Deep Stop Calculation Table, what would your d. None of the above. first two deep stops be assuming the 36 metre stop doesn’t clear after the first deep stop.29. (Metric) Using the Equivalent Narcotic Depth Table, _____________________________ what is the END for 56 metres when diving TMx18/50? _____________________________ 35. (Imperial) You’re ascending from a dive using a multigas trimix computer that doesn’t calculate deep29. (Imperial) Using the Equivalent Narcotic Depth Table, stops. You’re leaving a depth of 160 feet and the what is the END for 184 feet when diving TMx18/50? computer shows your first stop as 120 feet. Using the _____________________________ Deep Stop Calculation Table, what would your first two deep stops be assuming the 120 foot stop30. Considerations in selecting a trimix for a dive include doesn’t clear after the first deep stop. a. decompression issues. _____________________________ b. oxygen exposure. 36. Which gas do you generally use at the first deep stop? c. logistics. d. All of the above. a. your deepest decompression gas b. your travel gas31. (Metric) Using the appropriate tables, what is the c. your back (bottom gas) “ideal” trimix for a dive to 72 metres? d. None of the above. _____________________________ 37. The traditional air break is 5 minutes every 20 to 2531. (Imperial) Using the appropriate tables, what is the minutes, but some theory suggests it’s better to break “ideal” trimix for a dive to 240 feet? a. 2-5 minutes every 10-12 minutes _____________________________ b. 8-10 minutes every 15-20 minutes c. 8-10 minutes very 20-25 minutes32. Which of the following would not be considered a d. 2-5 minutes every 30-35 minutes hypoxic trimix? a. TMx10.5/50 38. The theoretical benefit of having a small amount of b. TMx14/33 helium in your decompression gas is c. TMx18/50 a. that it helps you retain heat. d. TMx21/20 b. that it may reduce bubble formation. c. that it reduces the cost of your deco gases. d. There is no theoretical benefit. 10
  • Tec Trimix Diver Exam VERSION B and 17 minutes at 5 metres/15 feet. You’re ascending39. If your table or computer omits a regular 3 metre/ to the 6 metres/20 foot stop when you lose control of 10 foot stop interval between stops in your deco your buoyancy and rise to the surface. You have no schedule, it’s best to DCS symptoms and return to depth in about 2 min- a. ascend past those intervals at the prescribed rate. utes. What should your decompression schedule and b. make a 1 minute stop at the omitted 3 metre/10 gases be now? foot intervals. _____________________________ c. make a 5 minute stop at the midpoint between the required stops. 46. If you experience DCS symptoms while underwater d. None of the above. during a trimix dive a. discontinue decompressing, surface immediately40. At the beginning of a descent, you normally wear and contact help. travel gas b. signal your teammates and/or surface support a. as the upper left hand cylinder. divers and complete your decompression while b. as the upper right hand cylinder. they arrange emergency care. c. You don’t wear the cylinder — you carry it. c. descend until the symptoms subside, then de- compress again with double all your deco times. d. None of the above. d. return to 10 metres/30 feet and remain there until symptoms subside.41. If you lose your deco gases on a trimix dive a. your options may be none or very limited. 47. Shallow breathing leads to high gas consumption be- b. support divers, if available, may be able to bring cause down more. a. it causes nitrogen to build up. c. you may be able to use teammates’ gas if they b. it causes helium to build up. didn’t lose theirs. c. it causes carbon dioxide to build up. d. All of the above. d. All of the above.42. If your multigas trimix computer fails during a dive 48. The primary mission of a trimix dive a. you can use a backup multigas trimix computer to abort the dive. a. is to get the job done. b. you can use backup tables, depth gauge and b. depends upon mission focus. timer to abort the dive. c. cannot be predicted in advance. c. Both a and b. d. None of the above. d. None of the above. 49. Your responsibilities as a trimix diver include43. An effective support diver’s qualities include being a. accepting the risks of tec and trimix diving. a. a good communicator. b. staying current and keeping your skills sharp. b. patient. c. being patient in expanding your limits. c. a creative problem solver. d. All of the above. d. All of the above. 50. Diving beyond an equipment’s rated depth may pose44. Your responsibilities as a Tec Trimix Diver include a risk of a. staying current with advances in dive technology, a. catastrophic failure (implosion). medicine and decompression theory. b. seal failure and cracking. b. diving only with the same team. c. non catastrophic crush. c. avoiding contact with less experienced divers. d. All of the above. d. All of the above.45. You’re decompressing from a dive with TMx21/35 to 55 metres/180 feet. After the deep stops, your schedule calls for EANx50 for 1 minute at 18 metres/ 60 feet, 2 minutes at 15 metres 50 feet, 3 minutes at 12 metres/40 feet and 4 minutes at 9 metres/30 feet, followed by 3 minutes on oxygen at 6 metres/20 feet 11