Scuba Diving Equipment and Techniques, Exams of Advanced Education

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PADI - IDC Equipment Final Exam SS- CL

(2024/2025)

_________ and ________ are the two most common blends of enriched air. Choose your answer. A EANx30 and EANx B EANx32 and EANx C EANx30 and EANx D EANx32 and EANx40 - ANSWER-EANx32 and EANx _____________ scuba systems are the most common type of recreation scuba equipment, are easy to use and maintain, and vent exhaled gases directly into the water. Choose your answer. A Rebreather B Open circuit - ANSWER-Open circuit A _________________ is used to tell you how much breathing gas you have left in your cylinder at any time. Choose your answer. A depth gauge B pressure transducer C dive computer D submersible pressure gauge - ANSWER-submersible pressure gauge A buddy team exits the water. Both divers are using dive computers. After a short surface interval, they plan another dive to 18 metres/60 feet. One device allows 38 minutes of bottom time at 18 metres/60 feet, the other allows only 32 minutes. Based on this information how should they plan their dive? Choose your answer. A Plan a maximum bottom time of 38 minutes because computers are intentionally designed to be more conservative than dive tables. B Plan a maximum bottom time of 32 minutes because computers are intentionally designed to be more conservative than dive tables. C Plan a maximum bottom time of 38 minutes but be sure to make a safety stop before surfacing. D Plan a bottom time of somewhat less than 32 minutes and make a safety stop before surfacing. - ANSWER-Plan a bottom time of somewhat less than 32 minutes and make a safety stop before surfacing. A valve that tends to open in the direction of flow is referred to as _____________ while a valve that tends to close in the direction of flow is referred to as _____________. Choose your answer.

A open circuit/closed circuit B closed circuit/open circuit C upstream/downstream D downstream/upstream - ANSWER-downstream/upstream A/An _________________ operates by not allowing water to directly contact the first stage piston or diaphragm. Choose your answer. A submersible pressure gauge B unbalanced valve C environmental seal D All of the above. - ANSWER-environmental seal All rebreathers recycle ________________ instead of allowing them to be wasted into the water. Choose your answer. A carbon dioxide B bubbles C usable gasses D air - ANSWER-usable gasses An/A _________________ depth gauge works by using Boyle's law. Choose your answer. A bourdon tube B analog C pressure transducer activated D None of the above. - ANSWER-None of the above. Before using your computer for the first time, you should read the manufacturer's instructions. Choose your answer. A True B False - ANSWER-True During a hydrostatic test a scuba cylinder is generally pressurized to ________ of it's working pressure. Choose your answer. A 5/3's B 3/5's C 9/10's D 1/2 - ANSWER-5/3s During a hydrostatic test a scuba cylinder is placed in a water-filled chamber. The cylinder is then filled with water. As the water pressure within the tank is increased, the

amount of expansion that occurs in the cylinder is measured by the amount of water that is displaced. Choose your answer. A True B False - ANSWER-True Fail safe refers to a regulator's tendency to _____________ because of the use of a(n) _____________ valve in the second-stage. Choose your answer. A breathe easily/open circuit B free-flow/downstream C breathe easily/closed circuit D free-flow/upstream - ANSWER-free-flow/downstream Identify the component of an open circuit scuba regulator indicated in the photograph. Choose your answer. A Alternate air source B Low pressure inflator C Primary second stage D First stage - ANSWER-Primary second stage Identify the indicated component of a dive compass. Choose your answer. A Lubber line B North needle C Bezel D Index mark - ANSWER-Index mark Identify the indicated component of a dive compass. Choose your answer. A North needle B Lubber line C Index mark D Bezel - ANSWER-Lubber line Identify the indicated part of a cylinder valve. Choose your answer. A Burst disc B High pressure port C Low pressure port D Debris tube - ANSWER-Debris Tube Identify the type of valve pictured. Choose your answer. A K valve

B J valve C DIN valve D Yoke valve - ANSWER-DIN valve If your computer fails: (choose all that apply) Choose your answer. A during a dive, use your backup computer if you have one. B during a dive, share your buddy's computer. C between dives, use your backup computer if you've been diving with one. D you may be able to resume diving using tables. - ANSWER-during a dive, use your backup computer if you have one. between dives, use your backup computer if you've been diving with one you may be able to resume diving using tables. One advantage of an open circuit demand valve regulator is that it avoids carbon dioxide buildup by reducing dead air spaces. Choose your answer. A True B False - ANSWER-True The ___________________ of a dive computer informs the computer what depth it is at. Choose your answer. A decompression algorithm B display C clock D pressure sensor/transducer - ANSWER-pressure sensor/transducer The (+) designation that appears on _____________ tanks denotes that the tank may be overfilled to _____________ beyond its working pressure. Choose your answer. A steel/15% B aluminum/10% C steel and aluminum/10% D steel/10% - ANSWER-steel/10% The component of an open circuit scuba regulator that reduces the intermediate air pressure to ambient pressure for breathing is: Choose your answer. A second stage B first stage C Low pressure hose D burst disc - ANSWER-second stage

The fundamental function of the first stage of an open circuit regulator is to: Choose your answer. A reduce the intermediate pressure from the cylinder to a breathable pressure. B reduce the high pressure delivered by the cylinder to an intermediate pressure. C recycle usable breathing gases. D turn the air on and off from the cylinder. - ANSWER-reduce the high pressure delivered by the cylinder to an intermediate pressure. The illustrated compass is a _______________ type. Choose your answer. A direct reading B indirect reading - ANSWER-direct reading The primary advantage of a __________________ over an unbalanced one is that they breathe easier at greater depths, even at low tank pressures, provide greater air flow, and are better able to supply a second diver breathing from an octopus. Choose your answer. A closed circuit B balanced first stage C first stage valve D downstream valve - ANSWER-balanced first stage The term "demand valve" refers to the fact that the regulator will provide air: Choose your answer. A during both inhalation and exhalation. B only upon inhalation. C only upon exhalation. D at a constant flow regardless of the inhalation effort. - ANSWER-only upon inhalation The term "open circuit" refers to the fact that: Choose your answer. A electricity is used to test the regulator's air-flow rate. B the regulator is made from nonmagnetic metal. C the exhaled air is released directly into the water. D All of the above are correct. - ANSWER-the exhaled air is released directly into the water. To ensure the structural integrity of a scuba tank, it should be _____________ anytime it is _____________. Choose your answer. A destroyed/at an age of twenty years B hydrostatically tested/exposed to temperatures above 82ºC/180ºF C visually inspected/left unused for more than two years

D All of the above are correct. - ANSWER-hydrostatically tested/exposed to temperatures above 82ºC/180ºF To plan a dive with your computer: (choose all that apply) Choose your answer. A scroll the NDLs to find the limit for your planned depth. B agree on a time limit with your buddy. C write down the NDL for your planned and next greater depth. D plan dives so the maximum depths are progressively shallower. - ANSWER-scroll the NDLs to find the limit for your planned depth. agree on a time limit with your buddy. write down the NDL for your planned and next greater depth. plan dives so the maximum depths are progressively shallower. To prevent a scuba tank from rupturing due to overpressurization, a burst disk is installed in the _____________, and is designed to rupture when the tank pressure rises above about _____________ of the tank's rated pressure. Choose your answer. A regulator/200% B tank neck/225% C valve/140% D submersible pressure gauge/125% - ANSWER-valve/140% Two divers may use a single dive computer provided they are careful to remain together and dive the exact same profile. Choose your answer. A True B False - ANSWER-False Typically, aluminum cylinders have higher working pressures so they hold comparable or slightly more air than steel cylinders. Choose your answer. A True B False - ANSWER-True Under what circumstances should a scuba cylinder be visually inspected? (choose all that apply) Choose your answer. A Air compressor defective or air smells unusual B The valve is removed C After hydrostatic re-test D Cylinder exterior is damaged E Burst disc fails

F Its previous history is unknown - ANSWER-Air compressor defective or air smells unusual The valve is removed After hydrostatic re-test Cylinder exterior is damaged Burst disc fails Its previous history is unknown What situations dictate a need for a compass? (choose all that apply) Choose your answer. A When diving in low visibility water B When diving in midwater C When diving at night D When you can't use natural references to navigate - ANSWER-When diving in low visibility water When diving in midwater When diving at night When you can't use natural references to navigate When flying after a dive with your computer, it's recommended that you ____________ or when the computer says you can fly - whichever is longer. Choose your answer. A follow the dive medical community recommendations B wait 4 hours C wait 8 hours D None of the above - ANSWER-follow the dive medical community recommendations When using enriched air with up to _________ oxygen generally, you may use standard scuba equipment (except cylinder), use of oxygen compatible lubricants is generally recommended, and follow all manufacturer recommendations regarding using their equipment with enriched air. Choose your answer. A 40 percent B 36 percent C 38 percent D None of the above. - ANSWER-40 percent

Which of the following tank markings designates the hydrostatic test date? Choose your answer. A 3AL B 7@ C 675432 D 3000 - ANSWER-7@ Which of the following tank markings designates the type of metal used to construct the scuba tank?Choose your answer. A 3AL B 7@ C 675432 D 3000 - ANSWER-3AL While on a dive in a mountain lake at an altitude of 3,000 metres/10,000 feet, a diver checks his depth. He is using a capillary depth gauge which indicates a depth of 14 metres/45 feet. If he actually measured the linear distance to the surface from where he is, he would find that: Choose your answer. A he is exactly 14 metres/45 feet beneath the surface. B he is actually more than 14 metres/45 feet below the surface. C he is actually less than 14 metres/45 feet below the surface. D The answer cannot be determined from the data provided. - ANSWER-he is actually less than 14 metres/45 feet below the surface. Why do you need to know the maximum depth of a dive and how long you've been underwater? Choose your answer. A To avoid decompression sickness and remain within your planned depth and time limits B So you can ascend at the appropriate rate C To avoid air embolism D All of the above. - ANSWER-To avoid decompression sickness and remain within your planned depth and time limits You can use a _______________ to keep nitrogen levels in your body within accepted limits. Choose your answer. A submersible pressure gauge B regulator C dive computer D surface float - ANSWER-dive computer

You should not turn off your dive computer, or replace the batteries between dives, because that would cause it to lose any memory of previous dives, which could cause it to calculate repetitive dives incorrectly and create an unacceptable risk of _________________. Choose your answer. A decompression sickness B air embolism C headache D nitrogen narcosis - ANSWER-decompression sickness