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1
Q

Convert 5200 PPM to %

A

0.52%

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2
Q

To convert F to absolute you must add?

A

460

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3
Q

What is 65 F in C

A

18.3

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4
Q

How much gas does a 12 L bailout charged with 200 bar hold?

A

2.4 m3

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5
Q

Convert 1500 L to m3

A

1.5 m3

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6
Q

How much gas is required to pressurise a chamber with FV of 20 m3 to 65 msw?

A

130 m3

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7
Q

A 12 L bailout charged to 300 bar has how much gas available to a diver at 75m? (- 10 for reg)

A

3.37 m3

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8
Q

A 64 x 50 L quad is at 195 bar. How much gas does it contain?

A

624 m3

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9
Q

A 10 L bailout at 200 bar. How long would it last in an emergency at 50 msw? (- 10 bar for reg)

A

7 mins 40 seconds

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10
Q

What is the PPo2 of air at 35 msw?

A

945 mb

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11
Q

If a gas contains 12% o2, at what depth would you change it over to prevent the PPo2 dropping below 500mb?

A

32 msw

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12
Q

A chamber at a depth of 230 msw contains 1.5% o2. If vented to surface what would the PPo2 be?

A

15mb

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13
Q

If a diver has 1L of gas in solution at 1 bar absolute, how much would he have in solution at 40 msw?

A

5L

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14
Q

A bell is blown down to a depth of 120 msw and a temperature of 38 C. What would be its depth when it cooled to 28 C?

A

116

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15
Q

During charging a bailout to 200 bar it reached 42 C. What would be the pressure if it cooled to 25 C?

A

189 Bar

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16
Q

What is the amount of gas needed to blow a chamber with a FV of 25 m3 down from 80 msw to 110 msw?

A

75 m3

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17
Q

A chamber contains 12% o2. What would be the PPo2 if it was vented to surface?

A

120 mb

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18
Q

How much gas would a diver consume over 3 hours at a depth of 75 msw at a consumption rate of 35 L/ min?

A

53.6

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19
Q

Convert 0.28% into ppm

A

2800 ppm

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20
Q

What is the PPN2 at a depth of 30 msw breathing air?

A

3.2 bar

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21
Q

A compressor has an output of 60 m3 / hr at 10 bar. How many divers would it support at 50 msw?

A

4

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22
Q

A diver is working at 80 msw, breathing from a 16 x 50 L quad, at a pressure of 150 bar. How long can he work if the quad is changed over at 40 bar.

A

4 hours 40 minutes

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23
Q

What is the PPo2 of air at 47 msw?

A

1.2 bar

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24
Q

A pontoon measures 10 x 3 x 4. It draws 2m. How much does it weigh?

A

61.8 ton

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25
What % o2 is required for a treatment mix with a PPo2 of 2.4 bar at 70 msw?
30%
26
A dDC is at 106 msw. Analyser reads 300 ppm Co2. What is the SEP?
0.03%
27
A DDC is at 75 msw with 4% o2. If vented to surface what's the PPo2 and o2 %
40 mb & 4%
28
Name the 3 states of bouyancy
Positive, neutral & negative
29
A pontoon displaces 6 m3 of seawater and weighs 5 ton. What's its state of buoyancy and by how much?
1.18 ton positive
30
What is the pressure exerted by 1 atmosphere in mmHg and PSI?
760 mmHg & 14.7 psi
31
Convert 6220 PPM to a %
0.622%
32
What is the absolute pressure at 165 fsw in PSI ?
88.2 PSI
33
To convert Celsius to Kelvin you must add?
273
34
What is 32 degrees C in F?
89.6 F
35
How much gas does a 10 L bailout hold at 200 bar?
2000 L
36
Convert 1000 L to m3
1 m3
37
How much gas to pressurise at chamber with a 22m3 FV to 37 msw?
103.4 m3
38
How much gas would a diver use at 100 fsw?
5.04 ft3/min
39
How much gas would it take to pressurise a chamber with a FV of 22 m3 to a depth of 37 msw
81.4 m3
40
How much gas would a diver require at 100 fsw?
5.04 ft3/min
41
A compressor has a delivery of 7 ft3/ min. To what depth would it support a diver?
151.8 fsw
42
A 12 liter bailout is charged to 200 bar. If the regulator dive pressure is 8 bar, how much gas is available to the driver at 42 msw?
2241.6 litres
43
How much gas is contained in a 45 x 50 L cylinder quad charged to 185 bar?
416 m3
44
A 6 L bailout is charged to 200 bar, if drive pressure is 8 bar, what is the bailout duration in an emergency at 52 msw?
4 min 30 sec
45
What is the PPo2 of air at 47 msw?
1.2 bar
46
If a chamber at 210 msw has 1.5% o2 and was vented to surface what would the PPo2 be?
0.015 bar
47
What is the PPN2 of air at 99 fsw?
3.16 Ats
48
If a diver has 1 L of gas in solution at 1 bar, how much would he have in solution at 50 msw?
6 L
49
A diver weighs 300 lbs & displaces 4.5 ft3 of seawater. If he wants to be 20 lbs negative how much extra weight is required?
9.7 lbs
50
A bell recieves an upthrust of 14,250 lbs and weighs 6.5t. How much buoyancy is required to make it 500 lbs positive?
813 lbs
51
During blow down to 100m temperature reached 35deg C. What would be the depth if it cooled to 25 degrees C?
96.75 m
52
What amount of gas is required to blow a chamber from 30 msw to 60 msw if the chamber volume is 14 m3?
56 m3
53
A chamber contains 6% O2 at 60m. What would it be if vented to surface?
0.06 bar
54
How much gas would a diver consume over 4 hours at 110 msw?
100.8 m3
55
How much gas would a diver consume over 4 hours at 110 msw?
100.8 m3
56
A diver is working at 130 fsw. How much air is he breathing / minute?
6.17 ft3 / min
57
A diver is working at 25 msw, what's his consumption / minute?
122.5 L / min
58
What is the minimum volume a compressor needs to supply a diver at 30 msw?
140 L/min
59
A 64 x 50 quad is at 200 bar, and can be used until the pressure drops to 40 bar. What volume of gas is available to the diver?
512 m3
60
A quad contains 22,500 ft/3 at 3000 psi. How much does is contain at 2000 psi?
15,000 ft/3
61
What volume of gas is required to pressurise a 15 m3 chamber to 90 msw?
135 m3
62
What volume of gas is required to pressurise a 350 ft/3 chamber to 400 fsw?
4242 ft3
63
A wet bell displaces 3.5 m3 of sea water. What is the upthrust of the bell?
3.61 ton
64
A pontoon is 10m x 5m x 2m and floats with a freeboard of 0.5m. What is its weight?
77.25 ton
65
What is the PPo2 of air at 40 msw?
1.05
66
What is the PPo2 of air at 90 fsw?
0.78 ats
67
What is the PPo2 of a 12% mix at 120 msw?
1.56 ba
68
What is the PPo2 of an 18% mix at 70 msw?
1.44 ba
69
What is the PPo2 in a 16% mix at 260 fsw?
1.42 ats
70
How deep can a diver go using a 50/50 nitrox mix without exceeding a PPo2 of 1.5 bar?
20 m
71
A diver works for 20 min at 50 msw. How much gas does he use?
4,200 litres
72
A bell displaces 7.7 m3 seawater and weighs 7.5 ton. How much weight is needed to make it negatively buoyant by 300 kg?
731 kg
73
A pontoon is 10m x 7m x 2m and weighs 110 ton. What will its freeboard be in salt water
470 mm
74
Which of the following is equivalent to bar? Kg/cm2 msw KPa fsw
Kg/cm2
75
Convert 1550 ppm to %
0.155%
76
A 10 ton lift bag was filled with 1 m/3 of air at 40 msw. What will the volume of air be at surface?
5 m3
77
How long will a 10 L bailout charged to 160 bar last at 40 msw if the regulator drive pressure is 12 bar?
7 mins 9 seconds
78
A 16 x 50 quad contains 160 bar. How long will it last 2 divers at 75 msw if the regulator drive pressure is 12 bar? (quad changed at 40 bar)
2 hours 13 mins
79
A bailout charged to 180 bar reaches 41 degrees C. What is the pressure of it cools to 30 degrees C?
173.7 bar
80
A diver dives to 44 msw on air, what is his PPo2?
1.13 bar
81
A pontoon is 15m long by 4 wide and 2 high. It has a draft of 1.5m. What is its upthrust?
92.7 ton
82
How much weight can be placed on the pontoon until it sinks?
30.9 ton
83
A pontoon is 23 long x 5 wide x 4 high. It weighs 350 ton. What is it's freeboard?
1.04 m
84
A chamber is vented from 100 msw with oxygen content of 3.57% to 25 msw. What is the o2 % and PPo2?
3.57 % / 0.12 PPo2
85
What is 28 degrees C in F?
82.4
86
You have 10% online to the BIBS. What depth do you need to change to a richer mix in order to prevent PPo2 falling below 0.16 bar?
6 msw
87
A DDC is at a depth of 90 msw and contains 5% o2. If vented to 10 msw what is the PPo2?
0.1 bar
88
A bell displaces 8 m3 of seawater and weighs 8 ton. How much weight must be added to make if -500 kg negatively buoyant?
740 kg
89
What is the equivalent air depth formula?
(Decimal % N2) x (msw + 10) - 10 ___________________________________ 79

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