Q: If a diver leaves the surface at 1115 and after a surface interval of 890 minutes makes another dive, what is the time they begin their second dive?

$$1115 + 890\ \text{minutes} = 1115 + 14\ \text{hours} \ 50\ \text{minutes} = 26:05 (or$$ $$2:05$$ next day)

Question 1

A diver uses a pneumofathometer to measure their depth. If the device reads 145 fsw and the correction factor for the 101-200 fsw range is +2 fsw, what is the diver's actual depth?

Accepted Answer

$$147\ 	ext{fsw}$$

Question 2

During decompression, a diver is delayed at the 30 fsw water stop for 3 minutes. If the standard stop time is 5 minutes, what is the total time spent at this stop?

Accepted Answer

$$8\ 	ext{minutes}$$

Question 3

A diver makes a dive to 136 fsw for optimum time on standard air tables, then after a surface interval of 500 minutes, makes another dive to 16 fsw for optimum time. What is the primary reason for using a long surface interval between dives?

Accepted Answer

To allow nitrogen levels in the body to decrease, reducing decompression sickness risk.

Question 4

If a diver leaves the surface at 1115 and after a surface interval of 890 minutes makes another dive, what is the time they begin their second dive?

Accepted Answer

$$1115 + 890\ 	ext{minutes} = 1115 + 14\ 	ext{hours} \ 50\ 	ext{minutes} = 26:05 (or$$ $$2:05$$ next day)

Question 5

Why is it important to apply correction factors to pneumofathometer readings when determining a diver's depth?

Accepted Answer

Because the device can underestimate actual depth due to calibration and environmental factors.

Question 6

A diver makes a dive to 115 fsw for 35 minutes with no penalty. If delayed at the 30 fsw water stop for 3 minutes, what is the effect on the decompression schedule?

Accepted Answer

The total decompression time increases by the delay duration.

Question 7

Which of the following best describes the purpose of water stops during decompression?

Accepted Answer

To allow dissolved gases to safely leave the body and prevent decompression sickness.

Question 8

If a diver's pneumofathometer reads 220 fsw, and the correction factor for the 201-300 fsw range is +2 fsw, what is the diver's actual depth?

Accepted Answer

$$222\ 	ext{fsw}$$

Question 9

A diver leaves the surface at 1700 and after 0 hours makes a second dive to 126 fsw for optimum time. What is the most likely reason for a zero-hour surface interval?

Accepted Answer

The dives are considered a single continuous exposure for decompression calculations.

Question 10

Which instrument is used to measure a diver's depth by reading the pressure of water at the diver's location?

Accepted Answer

Pneumofathometer

Question 11

If a diver makes a dive to 125 fsw for optimum time and incurs a 150 penalty, what does the penalty most likely refer to?

Accepted Answer

Additional decompression time required due to exceeding table limits.

Question 12

A diver's decompression schedule includes a chamber period of 15 minutes at 50 fsw on oxygen. What is the physiological benefit of using oxygen during decompression?

Accepted Answer

Oxygen accelerates the elimination of inert gases from the body.

Question 13

If a diver is omitted from decompression, what is the recommended immediate action?

Accepted Answer

Return the diver to depth and begin omitted decompression procedures.

Question 14

A diver makes a dive to 51 fsw for optimum time with no penalty. What does 'optimum time' refer to in this context?

Accepted Answer

The maximum allowable bottom time without incurring a decompression penalty.

Question 15

Why is it necessary to use different correction factors for pneumofathometer readings at various depth ranges?

Accepted Answer

Because the accuracy of the device varies with depth due to pressure and calibration effects.

Question 16

A diver is delayed at a water stop during decompression. What is the most significant risk associated with skipping or shortening water stops?

Accepted Answer

Increased risk of decompression sickness due to insufficient off-gassing.

Question 17

If a diver's pneumofathometer reads 95 fsw, what correction factor should be applied according to the provided study materials?

Accepted Answer

$$0\ 	ext{fsw}$$

Question 18

A diver makes a dive to 150 fsw for 2 minutes. What is the most likely decompression requirement for such a short exposure?

Accepted Answer

Minimal or no decompression required, depending on table limits.

Question 19

What is the main function of a decompression chamber in diving operations?

Accepted Answer

To simulate pressure conditions and safely manage omitted decompression or decompression sickness.

Question 20

A diver's decompression schedule includes a period of 5 minutes on oxygen at 30 fsw. What is the effect of breathing pure oxygen at this depth?

Accepted Answer

It increases the rate of inert gas elimination from the body.

Decompression Procedures and Depth Measurement in Diving Physics

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