Dive Decompression Terminology Practice Test

These questions are part of the practice quiz. Start practicing

• What is in-water decompression and when is it used?
• Which statement about depth gauges is true?
• Which action is described as part of travel-rate management during ascent?
• If you arrive early at a decompression stop, when should you begin timing the first stop?
• Stage Depth is defined as which of the following?
• What is no-decompression time (no-deco time) defined as in dive planning?
• What is the FSW correction for dives between 301 and 400 feet of seawater on a zeroed gauge?
• What is RGBM decompression and how does it differ from traditional models?
• What is a primary decompression risk of rapid ascent?
• Which table is used for Surface Decompression using Oxygen (Sur D 02)?
• In decompression theory, when are decompression stops triggered?
• Hyperbaric Oxygen Therapy (HBOT) is a high-pressure treatment using 100% oxygen. When is it indicated?
• Maximum Depth refers to which of the following?
• Explain Equivalent Narcotic Depth (END) and its role in nitrox planning.
• Is it safe to dive at altitude with pulmonary edema?
• What is the FSW correction for dives between 201 and 300 feet of seawater on a zeroed gauge?
• What does NDL credit refer to in surface interval planning for repetitive dives?
• Which abbreviation is used for residual nitrogen time in planning?
• Which option is NOT a listed action for CNS Oxygen Toxicity without convulsions?
• Which stop is a non-mandatory ascent pause intended to limit nitrogen loading?
• How long does it take for equilibration to occur?
• In decompression theory, tissue loading is best described as?
• Which of the following is NOT a non-technical factor influencing decompression risk?
• How is a repetitive dive credit earned and used?
• Hyperbaric Oxygen Therapy (HBOT) is indicated for which of the following conditions?
• Which term defines the total time from leaving the bottom to arriving on the surface?
• What time must be added to the Bottom Time of a repetitive dive to compensate for residual nitrogen in tissues?
• Decompression Table is best described as which of the following?
• What are Type I and Type II decompression sickness symptoms and how do they differ?
• True or False: 'Omitted D' may or may not be planned.
• What best defines a Decompression Schedule?
• How does a gradient factor influence the conservatism of a decompression profile?
• When rounding Reach Surface, the measurement is rounded in which direction?
• L stands for which term?
• Total Time Of The Dive is defined as which of the following?
• What is the FSW correction for dives between 101 and 200 feet of seawater on a zeroed gauge?
• What are common PPO2 safety limits used in recreational planning and why?
• Which abbreviation represents the time between surfacing and the next dive?
• If you are symptomatic at greater than 5 minutes but less than 7 minutes, which procedure applies?
• What does LS stand for in diving terminology?
• If you are symptomatic at 5 minutes or less, which procedure is indicated?
• Which moment is commonly referred to as Midnight in 24-hour time notation?
• Describe the difference between an 'air dive' plan and a 'nitrox plan' in terms of NDL and PPO2.
• How do MOD and NDL interact when planning a nitrox-based decompression schedule?
• What is the deco ceiling used to identify in some decompression models?
• Which are three symptoms of altitude sickness?
• Dive tables become less accurate as depth and time increase.
• Oxygen decompression stops, at which depths are they specified in the material?
• What is CNS Oxygen Toxicity and how is it detected or prevented?
• Which abbreviation indicates the total decompression time during ascent?
• Which statement best describes the difference between RGBM and fixed-M decompression models?
• Which is NOT a listed treatment for pulmonary edema?
• Define Maximum Operating Depth (MOD) and how it's determined for a gas.
• Which of the following is a clearly technical factor affecting decompression risk?
• No Decompression Limit defines which of the following?
• What is an M-Value in decompression theory?
• Why might a diver perform a Safety Stop at 5 meters instead of 3 meters?
• What is the Oxygen Window in decompression planning?
• Which of the following is NOT one of the five decompression tables?
• SI = LS - RS. If LS = 15 and RS = 5, SI equals?
• TBT stands for which term?
• What is the underlying cause of altitude sickness?
• Which statement best describes a Decompression Schedule?
• On a zeroed gauge, what is the FSW value for 0-100 fsw?
• Which statement best describes the hazards of an Exceptional Exposure Dive?
• Which term refers to a scheduled ascent stop to allow nitrogen off-gassing?
• What is 'O2 exposure' and how is it tracked during a gas-switch sequence?
• Which abbreviation denotes the total bottom time spent in a dive?
• R stands for which term?
• What table would you go to with Type I DCS?
• RS stands for which term?
• Which factor determines whether Table 5 or Table 6 is used for asymptomatic dives longer than 7 minutes?
• Which abbreviation corresponds to Reached Bottom?
• Define 'ascent rate' and its typical recommended limit for safe ascent.
• Altitude correction and its effect on no-decompression limits (NDL) is that it:
• Stage Depth refers to which reading?
• What is a Bühlmann decompression model and what is its key characteristic?
• What does an 'air-to-nitrox switch' entail and at what depth might it occur?
• For a No-D diver who ascends faster than 30 FSW/Min and is asymptomatic and does not need recompression, how long should you observe on the surface?
• TBT = BT + RNT. If BT = 6 and RNT = 4, what is TBT?
• What does equilibration refer to?
• After CNS Oxygen Toxicity symptoms have subsided, when should oxygen breathing be resumed?
• Which statement correctly compares equilibration and acclimatization times?
• In VPM, the model focuses on which factors rather than fixed M-values?
• What is the purpose of a 'deco ceiling' in some models?
• Which of the following describes the two mechanisms by which equilibration occurs at altitude?
• In nitrox planning, what does MOD constraints refer to?
• What is the deco ceiling used to identify in some decompression models?
• What is the last water stop depth for all decompression stops?
• Which term measures the overall duration from leaving the surface at the start until returning to the surface after the dive?
• What does Acclimation refer to?
• What defines an Exceptional Exposure Dive?
• When is a Safety Stop typically performed and what are its characteristics?
• When you exceed your travel rate during ascent, which action is recommended?
• What is the formula for finding Theoretical Ocean Depth TOD using Cross Corrections?
• Which statement best describes the effect of increasing the O2 fraction on the MOD for a fixed PPO2 limit?
• What does RGBM stand for and what is its fundamental approach?
• Differentiate between a Deep Stop and a Decompression Stop.
• SI stands for which term?
• Which statement accurately defines Exceptional Exposure Dive?
• What does No-Decompression Limit (NDL) mean in dive planning?
• What is the immediate action if a diver experiences CNS Oxygen Toxicity without convulsions in the chamber?
• In multi-gas decompression, how does a dive computer adjust when PPO2 limits are reached?
• Which statement about altitude sickness symptoms is correct?
• Explain CNS Oxygen Toxicity Threshold and how it's used in planning.
• Who is known as the Father of Altitude Diving?
• Which depth range requires a +7 FSW correction on a zeroed gauge?
• How does elevated PPO2 relate to Oxygen Toxicity risk, and what factors influence it?
• What is Residual Nitrogen Time (RNT) and how does it affect subsequent bottom times?
• Which term refers to the designation indicating the nitrogen load after a prior dive?
• FSW stands for what?
• Total Decompression Time is defined as which of the following?
• Which statement best describes equivalent narcotic depth (END)?
• Which statement describes Equivalent Single Dive?
• What is the formula to find the Altitude Stop Depth using Cross Corrections?
• How is depth adjusted when using a non-zeroed gauge at altitude?
• What are Gradient Factors in decompression theory and what do high/low values represent?
• If you are asymptomatic at greater than 7 minutes and you have 2 or fewer Sur D02, which table is used?
• Which statement best describes CNS oxygen toxicity planning?
• Oxygen decompression stops are only done at 20 or 30 FSW.
• If LB = 25 and LS = 12, what is BT?
• If you are asymptomatic at greater than 5 minutes but less than 7 minutes, which procedure is indicated?
• Which table provides limits when no decompression is required?
• Which table is the U.S. Navy Standard Air Table?
• What is Residual Nitrogen Time (RNT) and how does it affect planning?
• What does gradient factor primarily influence in decompression planning?
• Which term is synonymous with off-gassing during ascent and serves as a stop?
• What is Gas Switching and when might it be used during a dive?
• Explain Equivalent Air Depth (EAD) and its use in nitrox planning.
• What is a no-fly time and why is it recommended after a dive?
• Which term best defines residual nitrogen as the nitrogen gas still dissolved in tissues after surfacing?
• What does spare gas refer to and how is it used in deco planning?
• If altitude-related edema is suspected, should you attempt to dive at altitude?
• True or False: No correction is needed on FSW for dives between sea level and 300 fsw.
• Which term represents the deepest depth attained during a dive?
• What is a Gas Switch Strategy and why is it important for managing PPO2 and nitrogen loading?
• Which device computes No-Decompression Limits and decompression stops in real time?
• How is altitude diving different in terms of decompression planning?
• Which abbreviation denotes that the diver has reached a decompression stop?
• What does Equivalent Single Dive Time represent?
• What best describes a Deep Stop in ascent planning?
• How does PPO2 change with depth when breathing a fixed oxygen fraction?
• Exceptional Exposure Dives should ALWAYS be planned in advance by Civilian Companies.
• What is Surface Decompression?
• What is a Dive Computer and how does it differ from dive tables for decompression planning?
• Bottom Time is defined as which of the following?
• What is the corrected FSW for the 301-400 fsw range on a zeroed gauge?
• RNT stands for which term?
• Decompression Table is defined as which of the following?
• Which table is used for Surface Decompression using Air (Sur D Air)?
• What term describes any dive conducted after all residual nitrogen from prior dives has been eliminated from tissues?
• The time 2400 or 0000 corresponds to which moment?
• NDL stands for what in decompression terminology?
• How much time do you have to enter the chamber after surfacing?
• Descent Time is defined as which of the following?
• What term describes a specific decompression procedure corresponding to a defined depth and bottom time as listed in a decompression table?
• If you are asymptomatic at 5 minutes or less, which procedures apply?
• What describes a dive that requires decompression stops during ascent?
• LB stands for which term?
• PPO2 at surface breathing air (21% O2) is which value?
• What does VPM stand for and how does it differ conceptually from gradient-based models?
• The 4 ways to treat for Pulmonary Edema: which is the initial step?
• How is the deco stop depth determined in a Bühlmann model?
• What is a tissue compartment in decompression models and what does it represent?
• What term refers to the nitrogen gas still dissolved in a diver's tissues after surfacing?
• Decompression stops deeper than 30 FSW are performed on which breathing gas?
• No Decompression Limit is defined as which of the following?
• What phrase denotes the deepest depth reached by any part of the diver?
• What term defines any dive conducted while residual nitrogen remains from a prior dive?
• In asymptomatic divers longer than 7 minutes, how is the choice between Table 5 and Table 6 determined?
• If RS = 7 and SI = 5, what is LS?
• How do dive computers manage gas exposure when using multi-gas decompression?
• What is the standard format for representing Surface Interval?
• Altitude corrections in decompression planning are applied to which components?
• What is Enriched Air Nitrox (EANx) and why might divers choose it?
• How long does it take for Acclimatization to occur?
• Under what condition is a decompression obligation added to a dive plan?
• What table would you go to with Type II DCS?
• Which of the following correctly lists all four depth gauges?
• Name two non-technical factors that can influence decompression risk beyond depth and time.
• What designation is used to indicate the amount of nitrogen remaining in a diver's body after a previous dive?
• Surface Decompression is described as which of the following?
• What is the Partial Pressure of Oxygen (PPO2) and how is it calculated for a given depth and O2 fraction?
• BT = LB - LS. If LB = 20 and LS = 7, BT equals?
• How does surface interval credit affect repetitive dive planning with air tables?
• Which gauge uses the following stepped corrections: 0-100 fsw = +1 fsw; 101-200 fsw = +2 fsw; 201-300 fsw = +4fsw; 301-400 fsw = +7fsw?
• How many different decompression tables are listed?
• The ascent rate from the last water stop to the surface for Sur D 02 is 40 fpm.
• If RS = 5 and SI = 2, what is LS?
• Which factor primarily determines the deepest safe depth for a nitrox dive?
• Which depth gauge type is acceptable only if properly zeroed?
• Which breathing gas is used for decompression stops deeper than 30 FSW?
• What is a Decompression Stop and when is it required?
• What does alkalosis refer to?
• Left Surface is rounded in which direction?
• Which statement correctly describes the role of sea level pressure and altitude pressure in the TOD formula?
• Maximum Depth is defined as which of the following?
• If you are asymptomatic at greater than 7 minutes and you have more than 2 Sur D02, which table is used?
• If BT = 9 and RNT = 3, what is TBT?
• In most gradient-factor based plans, what is the effect of using a higher gradient factor value?
• Is a delay of up to 1 minute reaching the first decompression stop ignorable?
• Why is it necessary to adjust decompression tables for altitude?
• What does Surface Interval refer to?
• TDT stands for which term?
• Which statement best differentiates Descent Time from Bottom Time?
• Which unit is used to express decompression stop depths in the material?
• Which factor primarily determines the maximum operating depth (MOD) for a nitrox dive?
• In the TOD calculation, which term is in the numerator?
• Define Surface Interval and describe its impact on subsequent dives.
• What describes a dive that does not require decompression stops during ascent?