Aux 2 Unit 11 SCUBA Flashcards

Why is it important to prevent oil from overheating in compressors used for breathing air?

C) It prevents the formation of toxic gases in the air supply

What is the typical sequence of air flow in a three-stage air compressor system?

B) Intake, first-stage compression, intercooling, second-stage compression, intercooling, third-stage compression, discharge

What effect does excessive water vapor have when present in compressed air for diving?

C) It can condense and freeze, leading to regulator malfunction in cold water

What is a potential consequence of carbon monoxide contamination in compressed air for diving?

B) Loss of consciousness or carbon monoxide poisoning

What is one of the main dangers of overheated oil contaminating air used for breathing or diving?

B) It can produce toxic byproducts that are hazardous when inhaled

What is a potential consequence of long-term exposure to oil vapor in air used for diving?

C) Chronic respiratory conditions

Why are multi-stage compressors preferred over single-stage compressors for high-pressure applications like SCUBA diving?

B) They allow for gradual pressure increases, improving efficiency and safety

What type of maintenance should be performed on a SCUBA cylinder after use in saltwater?

B) It should be rinsed with fresh water to prevent salt buildup and corrosion

What is the primary risk associated with inhaling oil vapor in breathing or diving air?

B) Severe respiratory irritation and potential lung damage

What is the primary purpose of the activated carbon filter in a chemical filter tower?

B) To remove oil vapors and odors from the compressed air

What is a common source of oil contamination in compressed air used for breathing?

C) Improper maintenance or malfunction of the air compressor

In a three-stage air compressor system, what happens to the air during the third stage?

A) The air is compressed to its final high pressure and discharged

Why is it important to conduct regular hydrostatic testing on SCUBA cylinders?

B) To verify that the cylinder can safely withstand operating pressure

What element in a chemical filter tower is responsible for removing water vapor from the compressed air?

B) Desiccant filter

What is another issue caused by high levels of water vapor in compressed air used for diving?

B) Rust and corrosion in diving equipment

What is checked during a visual inspection of a SCUBA cylinder?

B) Signs of external and internal corrosion, dents, and cracks

What is the role of the final filter in a three-stage air compressor system for SCUBA?

C) To remove remaining oil and particulates before the air is used or stored

Why is a desiccant filter crucial in a chemical filter tower supplying air for diving?

B) It removes excess water vapor to prevent condensation and equipment corrosion

What is the primary purpose of using a three-stage air compressor system for SCUBA diving equipment?

B) To ensure the air is compressed to a safe, high pressure suitable for SCUBA tanks

What is a significant effect of inhaling air contaminated with carbon dioxide while diving?

B) Increased blood acidity and possible hypercapnia

What safety feature is typically included in a three-stage compressor to prevent over-pressurization?

B) Pressure relief valve

Which of the following is an essential component of a chemical filter tower for supplying air suitable for breathing and diving?

A) Activated carbon filter

Which component is typically used to neutralize harmful gases, such as carbon monoxide, in a chemical filter tower?

B) Catalytic converter

Why should the valve of a SCUBA cylinder be periodically inspected and serviced?

B) To ensure proper air flow and prevent leaks

What is one of the key checks performed during a hydrostatic test of a SCUBA cylinder?

B) The ability of the cylinder to withstand pressure without permanent deformation

What is a key function of the intercooler in a three-stage air compressor system?

B) To cool the air between compression stages to reduce the load on the next stage

Why is it important for the three-stage compressor system to include moisture separators?

B) To prevent water vapor from causing corrosion or freezing in the air supply system

Which of the following is a common safety procedure during a visual inspection of a SCUBA cylinder?

B) Using a light and inspection mirror to check for internal corrosion

Which contaminant, when present in compressed air, can lead to respiratory irritation and long-term lung damage?

B) Oil vapor

Which combination of filter elements is most likely found in a chemical filter tower designed for breathing and diving air?

A) Oil separator, catalytic converter, desiccant filter, activated carbon filter

Which combination of contaminants in compressed air poses significant health risks for divers?

B) Water vapor, carbon monoxide, and oil vapor

What is the recommended interval for a visual inspection of a SCUBA cylinder?

B) Annually

How should SCUBA cylinders be stored to ensure their longevity?

C) Partially filled and stored upright in a cool, dry place

What is a significant effect of excessive water vapor in breathing air for divers?

C) Potential freezing in the regulator at low temperatures

Which of the following can introduce water vapor contamination into a compressed air system?

B) Using a compressor without an efficient air drying system

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