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Physics Flashcards

1
Q

What is the absolute pressure at a depth of 254 msw?

A

26.4 bar

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2
Q

What is the absolute pressure at a depth of 254 fsw?

A

8.69 ata

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3
Q

A diver is working at 120 msw for 4 hours. What volume of gas will he use?

A

109.2 m3

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4
Q

A diver is working at 100 fsw for 30 minutes. What volume of gas will he use?

A

151.2 ft3

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5
Q

Two divers are working out of the bell at 75 msw. What volume of gas will they use in 4 hours?

A

142.8 m3

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6
Q

An air diver is working at 60 fsw for 20 minutes. What volume of air will he use?

A

70.45 ft3

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7
Q

A 64 x 50 litre quad contains gas at a pressure of 100 bar. What is the total volume of gas in the quad?

A

320 m3

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8
Q

The quad in Question 7 will be changed over when the pressure falls to 40 bar. What volume of gas is available to the diver?

A

192 m3

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9
Q

In Question 8, the diver is working at 130 msw. How long can he work for before the quad is changed over?

A

6 hours 32 minutes

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10
Q

A diver is working at 80 msw, breathing from a 16 x 50 litre quad at a pressure of 150 bar. How long could he work for? (Assume that the quad will be changed over at 40 bar.)

A

4 hours 39 minutes

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11
Q

A 64 x 50 litre quad is at a pressure of 205 bar. It can be used until the pressure falls to 30 bar. How much gas is available for use?

A

560 m3

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12
Q

A 12 x 50 litre quad is at a pressure of 25 bar. What volume of gas will be needed to fill it to a pressure of 200 bar?

A

105 m3

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13
Q

A bail-out bottle has a volume of 12 litres and contains gas at a pressure of 200 bar. If the diver is working at 100 msw, what volume of gas is available to him in an emergency?

A

2.15 m3

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14
Q

A diver is working at 195 msw, breathing from a 16 x 50 litre quad at a pressure of 110 bar. The quad will be changed over at 40 bar. How long could he work for?

A

1 hour 18 minutes

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15
Q

A quad contains 5800 ft3 when it is at a pressure of 3000 psi. How much gas does it contain when the pressure is 1800 psi?

A

3480 ft3

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16
Q

A quad contains 21650 ft3 at a pressure of 2800 psi. How much gas does it contain when the pressure is 600 psi?

A

4639 ft3

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17
Q

A quad contains 22,500 ft3 at a pressure of 3000 psi. It can be used until the pressure drops to 450 psi. What volume of gas is available to the diver?

A

19125 ft3

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18
Q

A diver is working at 250 fsw. He’s breathing from a quad which contains 22,500 ft3 of gas when it is at a pressure of 3000 psi at the start of his dive. Just now, it is at 2750 psi. How much longer could the diver work for? (Assume that the quad will be changed over at 500 psi.)

A

26 hours 13 minutes

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19
Q

A diver is working at 380 fsw. He is breathing from a quad which contains 22,500 ft3 of gas at a pressure of 3000 psi. The quad will be changed over at 450 psi. How long could the diver work for?

A

20 hours 22 minutes

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20
Q

A quad contains 5400 ft3 at a pressure of 2800 psi. It can be used until the pressure drops to 400 psi. What volume of gas is available to the diver?

A

4629 ft3

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21
Q

An LP compressor supplies 30 ft3/min at 300 psi. The diver plans to work at 100 fsw. Is the air supply sufficient?

A

Yes

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22
Q

A lightweight LP compressor delivers 250 l/min at a pressure of 15 bar. Two divers are planning to work at 30 msw. Is the air supply sufficient?

A

No

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23
Q

Two divers are planning to work at 60 fsw, using an LP compressor. What is the minimum delivery volume and pressure that they require?

A

7.04 ft3 per minute, 188 psi (12.82 ata)

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24
Q

A bail-out bottle has a floodable volume of 12 litres. How much time has a diver got if his surface supply fails at 200 msw? The bail-out bottle is at a pressure of 180 bar.

A

2.1 minutes or 2 minutes 7 seconds

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25
A bail-out bottle contains 100 ft3 at 3500 psi. It is at a pressure of 3000 psi. If the diver’s surface supply fails at 500 fsw, how long has he got to get back to the bell?
3.1 minutes or 3 minutes 6 seconds
26
After filling to 200 bar, a bail-out bottle is at a temperature of 30 °C. What will the pressure be when the temperature drops to 4 °C?
183 bar gauge
27
After filling to 3500 psi, a bail-out bottle is at a temperature of 40 °C. What will the pressure be when the temperature drops to 4 °C?
3097 psi
28
A diver at 250 fsw is breathing a 15% mix. What is the pO2 in his mix?
1.287 ata
29
In a chamber at 80 msw, the oxygen percentage reading is 4.5%. What is the pO2 in the chamber?
405 mb
30
A diver at 125 msw is breathing a 4% mix. What is his pO2?
540 mb
31
A diver at 165 msw is breathing a 4% mix. What is the pO2 in his mix?
700 mb
32
A diver at 340 fsw is breathing a 6% mix. What is the pO2 in his mix?
0.678 ata
33
A diver at 60 msw is breathing an 18% mix. What is the pO2 in his mix?
1.26 bar
34
What is the pO2 in a chamber at 50 fsw if the oxygen percentage is 23%?
0.578 ata
35
The pO2 in a chamber at 108 msw is 400 mb. What is the oxygen percentage?
3.39%
36
The pO2 in a chamber at 327 fsw is 0.42 ata. What is the percentage of oxygen in the chamber?
3.85%
37
During a saturation dive at 600 fsw, the divers require a pO2 between 0.5 and 0.8 ata. What is a suitable mix?
Anything between 2.6% and 4.2%
38
If the pO2 must lie between 1.2 and 1.6 bar, what is the greatest depth (in msw) at which you could use a 15% mix?
96.7 msw
39
During a bounce dive to 80 msw, the divers require a pO2 between 1.2 and 1.6 bar. What is a suitable mix?
Anything between 13.3% and 17.78%
40
During a saturation dive at 208 msw, the divers require a pO2 between 550 and 750 mb. What is a suitable mix?
Anything between 2.52% and 3.44%
41
Assuming that air contains 21% oxygen and 79% nitrogen, what is the pO2 and pN2 in air at 165 fsw?
1.26 ata, 4.74 ata
42
A hydrox mix contains 1% oxygen. How deep could the diver go without exceeding a pO2 of 750 mb?
740 msw
43
You want to make 200 bar of 9%, using 2% and 12%. What pressure of each gas do you need?
140 bar of 12% and, 60 bar of 2%
44
You want to make 180 bar of 6%, using 2% and 18%. What pressure of each gas do you need?
135 bar of 2%, 45 bar of 18%
45
You want to make 3000 psi of 23%, using 12% and 50%. What pressure of each gas do you need?
2132 psi of 12%, 868 psi of 50%
46
You want to make 2500 psi of 12%, using 2% and 18%. What pressure of each gas do you need?
938 psi of 2%, 1562 psi of 18%
47
You have 100 bar of 4% and you want to turn it into 10%, by pumping in 20%. What will the final pressure of the mixture be?
160 bar
48
You have 45 bar of 2% and you want to turn it into 10%, by pumping in 18%. What will the final pressure of the mixture be?
90 bar
49
You have 1800 psi of 1.5% and you want to turn it into 4%, by pumping in 16%. What will the final pressure of the mixture be?
2175 psi
50
You have 600 psi of 2% and you want to turn it into 6%, by pumping in 18%. What will the final pressure of the mixture be?
800 psi
51
You have 50 bar of 2%, 40 bar of 4% and you want to mix them together and add 23% to make the mix up to 8%. What will the final pressure be?
121 bar
52
You have 500 psi of 6%, 400 psi of 4% and you want to mix them together and add 16% to make the mix up to 12%. What will the final pressure be?
2453 psi or 2450 psi exactly if using the triangle method
53
A chamber is to be pressurised to 90 msw, using 12% and 2%. The final pO2 must be 600 mb. What depth of 12% should you add to start the pressurisation?
21 msw
54
A chamber is to be pressurised to 250 fsw, using 16% and 2%. The final pO2 must be 0.5 ata. What depth of 16% should you add to start the pressurisation?
33 fsw
55
You want to pressurise a chamber to 500 fsw, using 18% and 1%. The final pO2 must be 0.6 ata. What depth of 18% should you add to start the pressurisation?
46.3 fsw
56
You want to pressurise a chamber to 120 msw, using 20% and 1.5%. The final pO2 must not exceed 650 mb. What depth of 20% should you add to start the pressurisation?
14 msw
57
A chamber system has a volume of 40 m3. What volume of gas would it take to pressurise it to 150 msw?
600 m3
58
A chamber system has a volume of 1200 ft3. What volume of gas would it take to pressurise it to 500 fsw?
18180 ft3
59
A chamber system has a volume of 38 m3. What volume of gas would it take to pressurise it to 212 msw?
805.6 m3
60
A chamber system has a volume of 875 ft3. What volume of gas would it take to pressurise it to 355 fsw?
9413 ft3
61
A chamber system has a volume of 30 m3. It is to be pressurised to 90 msw, with 21 msw of 12% and 69 msw of 2%. What volume of each gas would be needed?
63 m3 of 12%, 207 m3 of 2%
62
A chamber system has a volume of 1100 ft3. It is to be pressurised to 620 fsw, with 39 fsw of 18% and 581 fsw of 1%. What volume of each gas would be needed?
1300 ft3 of 18%, 19367 ft3 of 1%
63
A chamber system has a volume of 45 m3. It is to be pressurised to 197 msw, with 7 msw of 16% and 190 msw of 1.5%. What volume of each gas would be needed?
31.5 m3 of 16%, 855 m3 of 1.5%
64
A medical lock is 0.8 metres long and 0.3 metres in diameter. The chamber is at 160 msw. How much gas is used when the lock is operated?
0.912 m3
65
An equipment lock is 4 ft long and 2 ft 6ins in diameter. The chamber is at 510 fsw. How much gas is used when the lock is operated?
303.44 ft3
66
9 divers are in saturation for 5.5 days. How much oxygen will they use in the chamber?
35.64 m3
67
6 divers are in saturation for 12 days. How much oxygen will they use in the chamber?
1800 ft3
68
A decompression from 95 msw takes 2 days, with a pO2 of 600 mb. There are two divers in the chamber and the chamber volume is 10 m3. How much oxygen is used?
16.98 m3
69
A decompression from 180 msw takes 4 days, with a pO2 of 600 mb. There are two divers in the chamber and the chamber volume is 10 m3. How much oxygen is used?
23.4 m3
70
6 divers are in saturation for a total of 11 days including decompression at 110 msw, with a pO2 of 400 mb. Before starting the decompression, the pO2 is raised to 600 mb. The decompression takes 3 days. The chamber volume is 15 m3. How much oxygen is used?
70.84 m3
71
How much oxygen is used when 2 divers are in a chamber at 4 days with a pO2 of 600 mb and a chamber volume of 10 m3?
23.4 m3 ## Footnote This calculation is based on the specific conditions provided.
72
What is the total oxygen usage for 6 divers in saturation for 11 days at 110 msw with a pO2 of 400 mb, raised to 600 mb before decompression?
70.84 m3
73
What volume of oxygen is required to raise the pO2 from 400 mb to 600 mb in a chamber of 17 m3?
3.4 m3
74
How much oxygen is used altogether when 6 divers are in saturation at 275 fsw for 12 days with a pO2 of 0.4 ata, raised to 0.6 atm for 2 days of decompression?
2569 ft3 100 ft3 for pO2 adjustment, 1800 ft3 for metabolic use, 669 ft3 for decompression.
75
If a chamber is at 145 msw and the temperature drops from 32 °C to 28 °C without adding gas, by how much would the depth decrease?
2 msw
76
What would be the depth decrease if a chamber at 345 fsw experiences a temperature drop from 31 °C to 26 °C without any action taken?
6.2 fsw
77
What is the pO2 at 130 msw when Chamber 1 is blown down from 97 msw using 2% with an initial pO2 of 400 mb?
466 mb
78
What is the pO2 at 210 fsw when a chamber is blown down from 180 fsw with an initial pO2 of 0.4 atm?
0.436 ata
79
After a leak, what is the pO2 at living depth of 125 msw if the chamber was at 50 msw with a pO2 of 180 mb and blown back using 5%?
555 mb
80
What is the pO2 at 100 fsw after Chamber 1 is bled from 320 fsw with a pO2 of 0.4 ata?
0.15 ata
81
What is the pO2 at 143 msw when a chamber with 2.1% oxygen is bled from 186 msw?
321 mb
82
What is the final pO2 when mixing atmospheres from Chamber 1 (12 m3 at 480 mb) and Chamber 2 (8 m3 at 400 mb)?
448 mb
83
What is the final pO2 when mixing two chambers, each with a volume of 400 ft3, with pO2 of 0.45 atm and 0.38 atm?
0.415 atm
84
What is the final pO2 when mixing three chambers with volumes and pO2 of: Chamber 1 (18 m3, 420 mb), Chamber 2 (12 m3, 400 mb), Chamber 3 (15 m3, 600 mb)?
474 mb
85
What is the pO2 in the bell at working depth of 200 msw if it was separated from a chamber at 185 msw with a pO2 of 400 mb?
460 mb
86
What is the pO2 at the surface after a pressurisation aborted at 70 fsw with an oxygen percentage of 8%?
0.08 ata
87
What is the true percentage of CO2 in the bell at 400 fsw with a scale reading of 1.4%?
True percentage 0.107%, pCO2 0.014 ata, SEP 1.4%
88
What is the true percentage of CO2 in the bell at 145 msw with a scale reading of 2%?
True percentage 0.13%, pCO2 20 mb, SEP 2.0%
89
Is the diving bell that displaces 5 m3 of seawater and weighs 4.8 tonnes positively buoyant?
Yes, the upthrust is 5.15 tonnes
90
Is the diving bell from Question 87 positively buoyant in fresh water?
Yes, the upthrust is 5 tonnes
91
Is the diving bell that displaces 180 ft3 of seawater and weighs 5.2 imperial tons positively buoyant?
No, the upthrust is 5.17 imperial tons
92
Is the diving bell that displaces 180 ft3 of seawater and weighs 5.2 US tons positively buoyant?
Yes, the upthrust is 5.79 US tons
93
What force is required to lift a concrete block (1m x 1m x 1m) with a density of 2400 kg/m3 clear of the seabed?
1.37 tonnes
94
What does a welding habitat weighing 25 tonnes in air and displacing 12 m3 weigh in seawater?
12.64 tonnes
95
How many 1-ton lifting bags are needed to lift a closed pipe weighing 12 imperial tons and displacing 140 ft3?
You need a lift of 7.98 tons, which is 8 lifting bags
96
A diver is breathing a 30/70 nitrox mix at 100 fsw. What is the EAD?
The EAD is 84.8 fsw, so use the next deepest table ## Footnote EAD = (nitrogen % x absolute depth) - 33 fsw 79
97
A diver is breathing a 40:60 nitrox mix at 25 msw. What is the EAD?
The EAD is 16.6 msw, so use the next deepest table | EAD = (nitrogen % x absolute depth) - 10 msw (79)

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