Exams ab

TEC TRIMIX DIVER EXAMS

Versions A & B

IMPORTANTDo not write in this booklet.

Please use the separate answer sheet provided.You may use a pen or pencil, scrap paper andthe 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 byProfessional Association of Diving Instructors

Product No. 70434 Version 1.0 (06/03) 010PDF3

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Tec Trimix Diver Exam VERSION A

Please use the separate answer sheet. Do not writein this exam book. You may use a pen or pencil, scrappaper and the tables in the Tec Trimix Diver Manualand the Tec Deep Diver Manual appendices.

1. Your potential risks as a Tec Trimix Diver include

a. helium is less forgiving of procedural errors.b. difficult or impossible to be rescued.c. hypoxia.d. All of the above.

2. The Tec Trimix Diver certification qualifies you to ini-tially dive to a maximum of

a. 60 metres/200 feet or the maximum depth youreached in training.

b. 75 metres/245 feet or the maximum depth you reached in training.

c. 90 metres/300 feet or the maximum depth youreached in training.

d. 100 metres/330 feet or the maximum depth you reached in training.

3. Which is not one of the benefits of diving with trimix?

a. less heat lost into breathing gas.b. less dense for easier breathing.c. reduced narcosis.d. reduced oxygen toxicity.

4. Compared to the same dive being made with air andthe same deco gases, for a typical technical dive atrimix dive will

a. have longer decompression.b. have no decompression.c. have less decompression.d. have reversed decompression.

5. According to the broad community standard, trimixis considered mandatory for all diving deeper than

a. 30 metres/100 feetb. 50 metres/165 feetc. 55 metres/185 feetd. 60 metres/200 feet

6. You’ve planned your dive based on diving withTMx18/50. Upon analysis, you find your oxygen analy-

sis is actually 17.5 percent. The normal action wouldbe

a. to have the blender add oxygen to adjust themix.

b. to drain the cylinders completely and reblendfrom scratch.

c. to add 10 percent to all your deco times.d. to dive the mix as planned.

7. All cylinders used in a trimix dive should be clearlymarked with

a. the gas, analyzed content, dive date and teamname.

b. the gas, diver’s name, dive date and maximumdepth.

c. the diver’s name, dive date, maximum depth andanalyzed content.

d. the gas, diver’s name, analyzed content and maxi-mum depth.

8. When you wear four cylinders, where you wear thegases on a particular dive should

a. depend on the gases you’re using.b. always follow your personal standard configura-

tion.c. vary based on your mood.d. None of the above.

9. You can’t generally put trimix in your dry suit because

a. helium conducts heat too rapidly to effectively in-sulate you.

b. doing so poses a risk of isobaric counterdiffusion.c. Both a and b.d. None of the above.

10. An argon inflation system has

a. no second stage.b. an over pressure relief valve.c. a label clearly marking it as argon.d. All of the above.

11. When wearing two cylinders on each side, the con-vention is

a. right rich, left lean.b. left loaded, right reduced.c. left bottom low, right bottom second lowest.d. None of the above.

Tec Trimix Diver Examination

VERSION A

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12. The procedure you should follow to prevent switch-ing to the wrong gas is

a. the NO TOX gas switch.b. not specified.c. not crucial to follow if you know what you’re

doing.d. None of the above.

13. Compared to nitrogen, diving with helium is ____________________ tolerant of poor depth managementduring decompression.

a. lessb. morec. asd. None of the above.

14. Neo-Haldanean models

a. assume that if there’s no DCS, all inert gas remainsin solution.

b. use a deco strategy that gets the diver as shallowas possible as fast as possible.

c. Both a and b.d. None of the above.

15. Even using desktop deco software, to determineyour gas volume requirements on a trimix dive you’llhave to manually determine

a. your oxygen exposure.b. your partial pressure of oxygen.c. your decompression schedule.d. your SAC rates.

16. Team diving reduces accidents by

a. providing a “backup brain.”b. providing your reserve gas so you don’t have to.c. keeping you from doing dives that have any risk.d. All of the above.

17. Compatible gases benefit a team by

a. making it unnecessary to ever share gas in anemergency.

b. eliminating the “backup brain” aspect of team div-ing.

c. helping keep the team together.d. All of the above.

18. When using A Good Diver’s Main Objective Is To Liveto plan a trimix dive, “Diver’s” is the recall word for

a. depth.b. direction.c. deep stop.d. decompression.

19. After certification, simulation

a. remains a useful learning tool.b. has little real application.c. applies only to beginners.d. can interfere with planning an effective mission.

20. A fullface mask suited to tec diving should offer

a. use of standard second stages.b. special switch blocks for gas routing.c. ease of complete removal for gas switches.d. All of the above.

21. The primary advantages of diving with a multigastrimix computer include

a. that it is far less costly than a standard air computer.b. that it assumes you spend the entire dive at the

deepest depth.c. that it prevents you from breathing too fast.d. None of the above.

22. When planning dives with a multigas trimix computer

a. you will not need desktop deco software.b. you will use desktop deco software.c. you only need desktop deco software if you have

only one multigas computer.d. There’s not enough information to answer the

question.

23. To backup a multigas trimix computer

a. you can rely on your teammate’s computer.b. you can use backup tables with a depth gauge

and timer.c. you can use the computer’s auto-backup mode.d. None of the above.

24. Helium

a. dissolves in lipids more readily than oxygen andnitrogen.

b. is denser than oxygen and nitrogen.c. diffuses more rapidly than oxygen and nitrogen.d. conducts heat more slowly than oxygen and ni-

trogen.

25. An advantage of helium as a dive gas is

a. that it is cheaper than air.b. it is non narcotic at depth. c. it can cause HPNS.d. it insulates better than air.

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26. A disadvantage of helium as a dive gas is

a. its high density.b. it can cause oxygen toxicity.c. it can cause you to overheat in your dry suit.d. None of the above.

27. Switching to a trimix high in helium (more than 20percent) during ascent or decompression after divingwith air or enriched air poses a theoretical risk of

a. isobaric counterdiffusion.b. HPNS.c. nitrogen narcosis.d. CNS oxygen toxicity.

28. Inflating your dry suit with trimix can cause a decom-pression problem due to

a. isobaric counterdiffusion.b. transdermal narcosis.c. heat transfer capillary constriction.d. None of the above.

29. (Metric) Using the Equivalent Narcotic Depth Table,what is the END for 50 metres when diving TMx18/33?

____________________________________________

29. (Imperial) Using the Equivalent Narcotic Depth Table,what is the END for 165 feet when diving TMx18/33?

____________________________________________

30. Considerations in selecting a trimix for a dive include

a. decompression issues.b. narcosis.c. logistics.d. All of the above.

31. (Metric) Using the appropriate tables, what is the“ideal” trimix for a dive to 60 metres?

____________________________________________

31. (Imperial) Using the appropriate tables, what is the“ideal” trimix for a dive to 200 feet?

____________________________________________

32. Which of the following would not be considered ahypoxic trimix?

a. TMx10.5/50b. TMx14/33c. TMx18/50d. TMx21/20

33. You typically use a travel gas when

a. your decompression gases cannot be used shal-lower than 30 metres/100 feet.

b. your bottom mix has less than 21 percent oxygen.c. your bottom mix is narcotic above 30 metres/

100 feet.d. your bottom mix has less than 16 percent oxygen.

34. When making a repetitive dive after a trimix dive

a. make the next dive to the same depth or shallower.b. oxygen is generally the same or higher.c. avoid using air or enriched air for the repetitive

dive bottom gas.d. All of the above.

35. (Metric) You’re ascending from a dive using a multi-gas trimix computer that doesn’t calculate deepstops. You’re leaving a depth of 54 metres and thecomputer shows your first stop as 30 metres. Usingthe Deep Stop Calculation Table, what would yourfirst two deep stops be assuming the 30 metre stopdoesn’t clear after the first deep stop.

_____________________________

35. (Imperial) You’re ascending from a dive using amultigas trimix computer that doesn’t calculate deepstops. You’re leaving a depth of 180 feet and thecomputer shows your first stop as 100 feet. Using theDeep Stop Calculation Table, what would your firsttwo deep stops be assuming the 100 foot stopdoesn’t clear after the first deep stop.

_____________________________

36. Which gas do you generally use at the first deep stop?

a. your deepest decompression gasb. your travel gasc. your second deepest decompression gasd. None of the above.

37. What is the minimum duration and interval for an airbreak?

a. 5 minutes every 8 minutesb. 5 minutes every 15 minutesc. 5 minutes every 20 minutesd. 5 minutes every 30 minutes

38. The theoretical benefit of having a small amount ofhelium in your decompression gas is

a. that it may reduce bubble formation.b. that it helps you retain heat.c. that it reduces the cost of your deco gases.d. All of the above.

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39. One way to help control your ascent is to

a. keep your rate smooth by eliminating unnecessarystops.

b. watch your smallest bubbles instead of yourdepth gauge/computer.

c. ascend as fast as possible to the first stop, thenextend it by the ascent time.

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

a. start by breathing back gas at the surface untilready to descend.

b. teammates confirm that everyone’s breathing thecorrect gas before descending.


41. If you lose your deco gases on a trimix dive

a. your options may be none or very limited.b. support divers, if available, may be able to bring

down more.c. you may be able to use teammates’ gas if they

didn’t lose theirs.d. All of the above.

42. If your multigas trimix computer fails during a dive

a. you can use a backup multigas trimix computer toabort the dive.

b. you can use backup tables, depth gauge andtimer to abort the dive.


43. Support divers can be especially beneficial on trimixdives

a. by providing extra deco gas if necessary.b. by shuttling unneeded equipment to the surface.c. by standing by to lend assistance as needed.d. All of the above.

44. Your responsibilities as a Tec Trimix Diver include

a. not allowing new dive technology, medicine ordecompression 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 to60 metres/200 feet. After the deep stops, yourschedule calls for EANx50 for 1 minute at 21 me-tres/70 feet, 2 minutes at 18 metres/60 feet, 2 minutesat 15 metres 50 feet, 4 minutes at 12 metres/40 feet

and 6 minutes at 9 metres/30 feet, followed by 4minutes on oxygen at 6 metres/20 feet and 20 min-utes at 5 metres/15 feet. You’re ascending from the21 metre/70 foot stop when you lose control of yourbuoyancy and rise to the surface. You have no DCSsymptoms and return to depth within 5 minutes.What should your decompression schedule andgases be now?

_____________________________

46. If you experience CNS symptoms underwater, youshould stay on low oxygen gas

a. for at least 15 minutes.b. for at least 15 minutes after all symptoms subside.c. regardless of how it affects your decompression.d. You should not be on low oxygen gas.

47. Carbon dioxide buildup

a. can increase your breathing rate.b. can offset narcosis.c. is not a realistic problem in trimix diving.d. is usually an issue at the surface, not underwater.

48. The primary mission of a trimix dive

a. is for the entire team to return unhurt.b. depends upon the mission focus.c. cannot be predicted in advance.d. None of the above.

49. Your responsibilities as a trimix diver include

a. accepting the risks of tec and trimix diving.b. quitting if your physical or mental health requires it.c. being patient in expanding your limits.d. All of the above.

50. The safest course with respect to avoiding crushdepth is

a. test dive all equipment to twice the expected usedepth.

b. use nothing that has an air space in it.c. stay within the manufacturer’s depth rating.d. All of the above.

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TEC TRIMIX DIVER EXAM

Version B

IMPORTANTDo not write in this booklet.

Please use the separate answer sheet provided.You may use a pen or pencil, scrap paper andthe 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 byProfessional Association of Diving Instructors

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Tec Trimix Diver Exam VERSION B

Please use the separate answer sheet. Do not writein this exam book. You may use a pen or pencil, scrappaper and the tables in the Tec Trimix Diver Manualand the Tec Deep Diver Manual appendices.

1. Your potential risks as a Tec Trimix Diver include:

a. gas blend inaccuracy.b. difficult or impossible to be rescued.c. isobaric counterdiffusion.d. All of the above.

2. The Tec Trimix Diver certification qualifies you to ini-tially dive to a maximum of

a. 75 metres/245 feet or the maximum depth youreached in training.

b. 90 metres/300 feet or the maximum depth youreached in training.

c. 100 metres/330 feet or the maximum depth youreached in training.

d. None of the above.

3. Which of the following is a normoxic trimix?

a. TMx18/50b. TMx21/33c. TMx14/33d. TMx10.5/50

4. Within typical tec diving limits for a comparableair/enriched air dive, depth, oxygen content anddeco gases being the same, a trimix dive

a. requires less decompression.b. requires the same decompression.c. requires more decompression.d. you cannot predict the effect on decompression.

5. According to the broad community standard, trimixis considered mandatory for all overhead environ-ment dives or complex environment dives deeperthan

a. 30 metres/100 feetb. 40 metres/130 feetc. 50 metres/165 feetd. 60 metres/200 feet

6. When analyzing trimix, your blend should be withinplus or minus _____ percent of the intended oxygencontent.

a. 3b. 2c. 1 d. 0.5

7. All cylinders used in a trimix dive should be clearlymarked with

a. the gas, analyzed content, dive date and teamname.

b. the gas, diver’s name, analyzed content and maximum depth.

c. the diver’s name, dive date, maximum depth andanalyzed content.

d. the gas, diver’s name, dive date and maximumdepth.

8. You may choose to wear four cylinders all left or rightand left, but either way you should

a. have oxygen on the left side.b. have and maintain a personal standard in your

configuration.c. switch them all to the left side for decompression.d. All of the above.

9. You can’t generally put trimix in your dry suit because

a. doing so unnecessarily drains your gas supply.b. helium conducts heat too rapidly to effectively

insulate you.c. Both a and b.d. None of the above.

10. Argon is the preferred dry suit insulation gas because

a. it is inexpensive.b. it has low density.c. it is safe to breathe at depth.d. it insulates better than trimix, air or enriched air.

11. When wearing all cylinders on the left, the conventionis

a. breathe the bottom cylinder.b. move the cylinder you’re breathing to the right

side.c. the cylinder you’re breathing is always on top.d. None of the above.

Tec Trimix Diver Examination

VERSION B

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12. The procedure you should follow to prevent switch-ing to the wrong gas is

a. the NO TOX gas switch.b. not specified.c. not crucial to follow if you know what you’re

doing.d. None of the above.

13. You should try to vary no more than __________ fromyour decompression stop depth.

a. .3 metres/1 footb. .6 metres/2 feetc. 1 metre/ 3 feetd. 2 metres/6 feet

14. Bubble models

a. assume that if there’s no DCS, all inert gas remainsin solution.

b. use a deco strategy that gets the diver as shallowas possible as fast as possible.


15. Determining your gas volume requirements on a trimixdive

a. varies significantly from those used for air/en-riched air technical diving.

b. does not require a SAC rate.c. cannot be calculated by desktop deco software.d. None of the above.

16. Team diving has a greater likelihood of

a. accidents.b. decompression requirements.c. discovery.d. mission success.

17. Compatible gases benefit a team by

a. making it easier to share gas in an emergency.b. assisting the “backup brain” aspect of team div-

ing.c. helping keep the team together.d. All of the above.

18. When using A Good Diver’s Main Objective Is To Liveto plan a trimix dive, “Objective” is the recall word for

a. objective.b. orientation.c. origination point.d. oxygen.

19. Simulation

a. is an effective learning tool before and after certi-fication.

b. is not directly applicable to trimix diving.c. is useful for training, but not beyond training.d. All of the above.

20. The primary advantage of using an appropriatetec diving fullface mask on a trimix dive is

a. that it keeps your face warm.b. it may reduce your risk of drowning if you have a

CNS oxygen convulsion.c. it reduces your gas consumption.d. All of the above.

21. The primary advantages of diving with a multigastrimix computer include

a. that it is far less costly than a standard air computer.b. that it assumes you spend the entire dive at the

deepest depth.c. that it simplifies handling some emergency situa-

tions.d. All of the above.

22. When planning dives with a multigas trimix computer

a. you will use desktop deco software.b. you will not need desktop deco software.c. you only need desktop deco software if you have

only one multigas computer.d. There’s not enough information to answer the

question.

23. To backup a multigas trimix computer

a. you can use back up tables in the computer’s fail-ure mode.

b. you can use a second multigas trimix computer.c. you can rely on your teammate’s computerd. None of the above.

24. Helium

a. dissolves in lipids more readily than oxygen and nitrogen.

b. is denser than oxygen and nitrogen.c. diffuses more slowly than oxygen and nitrogen.d. conducts heat more rapidly than oxygen and

nitrogen.

25. An advantage of helium as a dive gas is

a. that it is cheaper than air.b. it is easier to breathe at depth. c. it can cause HPNS.d. it insulates better than air.

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26. A disadvantage of helium as a dive gas is

a. its high density.b. it may be less forgiving of decompression errors.c. it can cause you to overheat in your dry suit.d. All of the above.

27. Isobaric counterdiffusion is caused when

a. a rapidly diffusing gas dissolves into body tissuesfaster than a slowly diffusing gas dissolves out.

b. a slowly diffusing gas dissolves out of body tissuesfaster than a rapidly diffusing gas dissolves in.

c. a slowly diffusing gas dissolves into body tissuesfaster than a rapidly diffusing gas dissolves out.

d. None of the above.

28. Inflating your dry suit with trimix can cause a decom-pression problem due to

a. isobaric counterdiffusion.b. transdermal narcosis.c. heat transfer capillary constriction.d. None of the above.

29. (Metric) Using the Equivalent Narcotic Depth Table,what is the END for 56 metres when diving TMx18/50?

_____________________________

29. (Imperial) Using the Equivalent Narcotic Depth Table,what is the END for 184 feet when diving TMx18/50?

_____________________________

30. Considerations in selecting a trimix for a dive include

a. decompression issues.b. oxygen exposure.c. logistics.d. All of the above.

31. (Metric) Using the appropriate tables, what is the“ideal” trimix for a dive to 72 metres?

_____________________________

31. (Imperial) Using the appropriate tables, what is the“ideal” trimix for a dive to 240 feet?

_____________________________

32. Which of the following would not be considered ahypoxic trimix?

a. TMx10.5/50b. TMx14/33c. TMx18/50d. TMx21/20

33. If your bottom gas has less than 16 percent oxygen,you will need

a. a travel gas.b. a dry suit.c. to make deep stops.d. None of the above.

34. Using desktop deco software, you may calculatedeep stops

a. by having the software generate them automatically.b. by using a bubble model if available in your soft-

ware.c. by calculating them and entering them manually as

waypoints.d. All of the above.

35. (Metric) You’re ascending from a dive using a multi-gas trimix computer that doesn’t calculate deepstops. You’re leaving a depth of 48 metres and thecomputer shows your first stop as 36 metres. Usingthe Deep Stop Calculation Table, what would yourfirst two deep stops be assuming the 36 metre stopdoesn’t clear after the first deep stop.

_____________________________

35. (Imperial) You’re ascending from a dive using a multigas trimix computer that doesn’t calculate deepstops. You’re leaving a depth of 160 feet and thecomputer shows your first stop as 120 feet. Using theDeep Stop Calculation Table, what would your firsttwo deep stops be assuming the 120 foot stop doesn’t clear after the first deep stop.

_____________________________

36. Which gas do you generally use at the first deep stop?

a. your deepest decompression gasb. your travel gasc. your back (bottom gas)d. None of the above.

37. The traditional air break is 5 minutes every 20 to 25minutes, but some theory suggests it’s better to break

a. 2-5 minutes every 10-12 minutesb. 8-10 minutes every 15-20 minutesc. 8-10 minutes very 20-25 minutesd. 2-5 minutes every 30-35 minutes

38. The theoretical benefit of having a small amount ofhelium in your decompression gas is

a. that it helps you retain heat.b. that it may reduce bubble formation.c. that it reduces the cost of your deco gases.d. There is no theoretical benefit.

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39. If your table or computer omits a regular 3 metre/10 foot stop interval between stops in your decoschedule, it’s best to

a. ascend past those intervals at the prescribed rate.b. make a 1 minute stop at the omitted 3 metre/10

foot intervals.c. make a 5 minute stop at the midpoint between

the required stops.d. None of the above.

40. At the beginning of a descent, you normally weartravel gas

a. as the upper left hand cylinder.b. as the upper right hand cylinder.c. You don’t wear the cylinder — you carry it.d. None of the above.

41. If you lose your deco gases on a trimix dive

a. your options may be none or very limited.b. support divers, if available, may be able to bring

down more.c. you may be able to use teammates’ gas if they

didn’t lose theirs.d. All of the above.

42. If your multigas trimix computer fails during a dive

a. you can use a backup multigas trimix computer toabort the dive.

b. you can use backup tables, depth gauge andtimer to abort the dive.


43. An effective support diver’s qualities include being

a. a good communicator.b. patient.c. a creative problem solver.d. All of the above.

44. Your responsibilities as a Tec Trimix Diver include

a. staying current with advances in dive technology,medicine and decompression theory.

b. diving only with the same team.c. avoiding contact with less experienced divers.d. All of the above.

45. You’re decompressing from a dive with TMx21/35 to55 metres/180 feet. After the deep stops, yourschedule calls for EANx50 for 1 minute at 18 metres/60 feet, 2 minutes at 15 metres 50 feet, 3 minutes at12 metres/40 feet and 4 minutes at 9 metres/30 feet,followed by 3 minutes on oxygen at 6 metres/20 feet

and 17 minutes at 5 metres/15 feet. You’re ascendingto the 6 metres/20 foot stop when you lose control ofyour buoyancy and rise to the surface. You have noDCS symptoms and return to depth in about 2 min-utes. What should your decompression schedule andgases be now?

_____________________________

46. If you experience DCS symptoms while underwaterduring a trimix dive

a. discontinue decompressing, surface immediatelyand contact help.

b. signal your teammates and/or surface supportdivers and complete your decompression whilethey arrange emergency care.

c. descend until the symptoms subside, then de-compress again with double all your deco times.

d. return to 10 metres/30 feet and remain there untilsymptoms subside.

47. Shallow breathing leads to high gas consumption be-cause

a. it causes nitrogen to build up.b. it causes helium to build up.c. it causes carbon dioxide to build up.d. All of the above.

48. The primary mission of a trimix dive

a. is to get the job done.b. depends upon mission focus.c. cannot be predicted in advance.d. None of the above.

49. Your responsibilities as a trimix diver include

a. accepting the risks of tec and trimix diving.b. staying current and keeping your skills sharp.c. being patient in expanding your limits.d. All of the above.

50. Diving beyond an equipment’s rated depth may posea risk of

a. catastrophic failure (implosion).b. seal failure and cracking.c. non catastrophic crush.d. All of the above.

Exams ab

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