Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Divemaster Exam Revision > Equipment > Flashcards

Equipment Flashcards

1
Q

What temperature, if accidentally exposing a scuba cylinder to or greater than, should you have the cylinder hydrostatically tested?

A

If accidentally exposing a scuba cylinder to 82 degress Celsius or greater, you should have the cylinder hydrostatically tested.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

During hydrostatic testing, the tester will immerse the scuba tank in water and fill it with what?

A

During hydrostatic testing, the tester will immerse the scuba tank in water and fill it with water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The type of scuba reguloator that screws directly into the tank valve and is useful for overhead environments is known as what?

A

The type of scuba reguloator that screws directly into the tank valve and is useful for overhead environments is known as

DIN (Deutsche Industrie Norm).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Failing to monitor depth and timing devices can significantly increase the chances of causing what condition?

A

Failing to monitor depth and timing devices can significantly increase the chances of causing DCS (Decompression Sickness).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The fail safe in a downstream valve regulator, is that in the event of a regulator malfunction, it will do what?

A

The fail safe in a downstream valve regulator, is that in the event of a regulator malfunction, it will free flow.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

After diving with an aluminum tank, a diver decides to use a steel tank.

What equipment adjustment would need to be made changing to a steel tank?

A

After diving with an aluminum tank, a diver decides to use a steel tank.

The amount of weight would need to be decreased becauase the steel tank is less buoyant.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What the benefits of a balanced regulator as opposed to an unbalanced regulator?

A

The benefits of a balanced regulator as opposed to an unbalanced regulator are that it delivers air at the same rate even if the tank is low or more than two divers are breathing from the same set at once.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A pilot valve is a diaphragm that opens a smaller valve that opens the main valve by creating a pressure imbalance, found in what stage of the regulator?

A

A pilot valve is a diaphragm that opens a smaller valve that opens the main valve by creating a pressure imbalance, found in the second stage of the regulator.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

A capillary gauge is designed to work at sea level and altitude according to which Law?

A

A capillary gauge is designed to work at sea level and altitude according to Boyle’s Law.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which stage of a regulator reduces high pressure from a tank to an intermediate pressure?

A

The first stage of a regulator reduces high pressure from a tank to an intermediate pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

An Environmental Seal design protects a regulator from what?

A

An Environmental Seal design protects a regulator from freezing up in extremely cold water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How can water enter a scuba cylinder?

A

Water can enter a scuba cylinder by:

- Improperly operated or maintained compressor

- Droplets in tank valve during fill

- Backflow through reg when tank is empty

- Changes in temp when tank is empty/valve left open

- Bleeding air rapidly, causing internal condensation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the signs of moisture accumulation in a cylinder?

A

The signs of moisture accumulation in a cylinder are:

- White mist when** **opening** **valve

- Sloshing sound

- Air has** **bad** **odor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the purpose of the valve snorkel?

A

The purpose of the valve snorkel is to prevent foreign matter from entering the valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the standard on/off cylinder valve called?

A

The standard on/off cylinder valve is the K-Valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the type of valve that was popular before submersible pressure gauges, but is not used today?

A

The type of valve that was popular before submersible pressure gauges, but is not used today is the J-Valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

In some countries you”ll find a dual valve for a single cylinder.

What types of valves are these?

A

In some countries you”ll find a dual valve for a single cylinder. These types of valves are the H valve or the Y valve.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What reasons would you use a Y valve or an H valve?

A

The reasons you would use a Y valve or an H valve are they allow attachment of 2nd reg for redundancy

(Deep dives or enclosure dives on a single cylinder)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The 2nd stage reduces intermediate pressure to what type of pressure?

A

The 2nd stage reduces intermediate pressure to an ambient pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

In what type of valve regulator is the operation of the regulator independent of the cylinders pressure?

A

In a balanced-valve regulator, the operation of the regulator is independent of the cylinders pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What valve is one that opens with high-pressure air flow?

A

A downstream valve is one that opens with high-pressure air flow.

22
Q

What valves are rarely used in modern regulators because of their tendency to fail in a closed position?

A

Upstream valves are rarely used in modern regulators because of their tendency to fail in a closed position.

23
Q

What are the two basic types of internal valves of first stages, both of which are produced in a balanced or unbalanced configuration?

A

The two basic types of internal valves of first stages, both of which are produced in a balanced or unbalanced configuration are the diaphragm and piston.

24
Q

The main valve of what valve regulator (2nd stage) is opened and closed with air pressure, rather than mechanical leverage?

A

The main valve of a pilot valve regulator (2nd stage) is opened and closed with air pressure, rather than mechanical leverage.

25
Q

If you see a greenish colour on the filter of a 1st stage, what does this mean?

A

If you see a greenish colour on the filter of a 1st stage, this means there is corrosion from moisture in the cylinder dripping onto the filter.

26
Q

If there is a blackish filter on a first stage, what does it mean?

A

If there is a blackish filter on the first stage, it means there is carbon dust in the cylinder from the compressor fill.

27
Q

Which are more accurate, analogue or digital instruments?

A

Digital instruments are more accurate.

28
Q

A flattened helical tube that is sealed at one end and tends to uncurl when pressurized internally is called what?

A

A flattened helical tube that is sealed at one end and tends to uncurl when pressurized internally is called a bourdon movement gauge.

Bourdon tube (found in your SPG)

29
Q

What are the 2 types of pressure gauges for determining the amount of air in a cylinder?

A

The 2 types of pressure gauges for determining the amount of air in a cylinder are:

1 - Surface cylinder pressure gauge

2- Submersible pressure gauge (SPG)

30
Q

Which port is bigger to prevent the wrong attachments?

A

The high pressure port is bigger than the low pressure port to prevent the wrong attachments.

31
Q

The only mechanical depth gauge that does not use bourdon movement is what?

A

The only mechanical depth gauge that does not use bourdon movement is a diaphragm depth gauge.

32
Q

What are two basic types of dive computers based on?

A

Two basic types of dive computers are based on tissue-based and table-based.

33
Q

An air compressor operates on the principle of whose law?

A

An air compressor operates on the principle of Boyle’s Law: Pressure is increased by reducing volume.

34
Q

What pressure, low volume compressors are used to fill scuba tanks?

A

High-pressure, low volume compressors are used to fill scuba tanks.

35
Q

What is a burst disk?

A

A burst disk is a thin copper disk located in the tank valve designed to blow if the tank is over-pressurized.

36
Q

Which kind of valve will fail into freeflow, downstream valves or upstream valves?

A

Downstream valves (it has a fail-safe mechanism) will fail into freeflow.

37
Q

Does a downstream valve open with the air flow or against the air flow?

A

A downstream valve opens with the air flow - the pressure is trying to open the valve.

38
Q

In a balanced regulator, does the air pressure resist, assist, or neither, the opening of the valve?

A

In a balanced regulator, it neither resists or assists the opening of a tank valve.

A balanced regulator breathes the same regardless of tank pressure.

39
Q

What are characteristics of a digital gauge?

A

The characteristics of a digital gauge are it’s easy to read, integrated into computers, may adjust for altitude automatically, expensive.

40
Q

How often are hydrostatic tests done?

A

Hydrostatic tests dates vary from country to country.

For example, Thailand every 5years & Australia every year.

41
Q

A tank marked:

DOT/CTC 3AA 2250
12345 PST 6*96+

Is made from what metal?

A

A tank marked:

DOT/CTC 3AA 2250
12345 PST 6*96+

Is made from Steel - 3AA = steel, 3AL = Aluminum

42
Q

A tank marked:

DOT/CTC 3AA 3000
12345 PST 6*96+

What is the working pressure?

A

A tank marked:

DOT/CTC 3AA 3000
12345 PST 6*96+

The working pressure is 3000 PSI.

43
Q

A tank marked:

DOT/CTC 3AA 2250
12345 PST 3,B,17+

Has what date of last hydro inspection?

A

A tank marked:

DOT/CTC 3AA 2250
12345 PST 3,B,17+

March, 2017 was the last date of the hydro inspection. The inspectors stamp says the initial B for the place which tested it.

44
Q

A tank marked:

DOT/CTC 3AA 2250
12345 PST 6*96+

What does the plus sign mean?

A

A tank marked:

DOT/CTC 3AA 2250
12345 PST 6*96+

The plus sign means the tank is allowed a 10% overfill.

45
Q

A tank marked:

DOT/CTC 3AA 2250
12345 PST 6*96+

What is the serial number?

A

A tank marked:

DOT/CTC 3AA 2250
12345 PST 6*96+

The serial number is 12345.

46
Q

Aluminium tanks vs steel tanks - which is the thicker tank?

A

Aluminium is the thicker tank.

47
Q

Aluminium vs steel - which is typically more commonly used in warm tropical waters?

A

Aluminium is typically more commonly used in tropical water because of corrosion.

48
Q

Aluminium vs steel - which is stronger?

A

Steel is stronger.

49
Q

Aluminium vs steel - which corrodes less quick?

A

Aluminium corrodes less quick.

50
Q

Aluminium vs steel - which requires more weight when diving?

A

Aluminium requires more weight when diving as it is a lighter metal.

Divemaster Exam Revision (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions