Pressure relief valve is to

prevent damage if the pressure reducing valve failed

increase oxygen bottle pressure

release pressure in the oxygen mask

Portable oxygen bottle is used by the cabin crew

when there is changes in cabin pressure

to allow them to check on the passenger have all got their mask on

When max cylinder pressure exceeded

the green disk rupture and yellow disk appear

the yellow disk ruptures and green disk appear

the red disk rupture and yellow disk appear

Which statement is wrong when the storage bottle indicated low pressure at the cockpit

will give indication (LO PR) on the panel

OXY caution light will illuminate

single chime warning will sound

Oxygen cylinder test dates

may be stenciled on the neck of the cylinder

are painted in white on the cylinder

are variable depending on discharge.

What is the function of the safety valve in a pneumatic system?

To prevent high pressure which may cause damage.

To prevent an over-temperature.

To stop the regulator dumping if at low pressure.

Which factor primarily limits the conversion of hydraulic systems to pneumatic operation in aircraft?

Limitations in capacity for large components

Lack of availability of compressed air

In a high-pressure pneumatic system, what is the main purpose of the pressure regulator?

B. To control maximum system pressure and off-load the compressor

A. To maintain a constant temperature in the system

C. To separate oil and water from the air supply

Why are pneumatic pipelines generally smaller in cross-section compared to hydraulic pipelines?

A. Air has lower viscosity than hydraulic fluid

B. Air is compressible, allowing smaller pipe diameters

C. Higher operating pressures require smaller pipes

During compressor operation, why is the air cooled between each compression stage?

B. To increase efficiency and reduce air temperature rise

A. To prevent over-lubrication of piston seals

C. To meet storage bottle temperature limits

In a four-stage piston compressor, what is the main function of the stepped piston design?

B. To progressively reduce the air volume and increase pressure

A. To balance air pressure on both sides

C. To provide lubrication channels

What is the function of a ground charging valve in a pneumatic system?

To allow charging and testing without running the engine

To relieve excess air pressure on the ground

To bypass the pressure regulator during testing

How does the oil and water trap prevent water from entering the pneumatic system during manoeuvres?

A. By using a baffle tube with a single outlet hole

B. By heating the air before entry

C. By bypassing air during high-G turns

Why is activated alumina used in a dehydrator?

B. It absorbs moisture to prevent freezing in components

A. It removes oil vapour from compressed air

C. It filters solid contaminants

In pneumatic maintenance, if oil is found in the system filter housing, what should be inspected?

A. Compressor and oil and water trap

B. Dehydrator and storage bottle

C. Pressure regulator and relief valve

How does the high-pressure relief valve operate to protect the system?

B. By venting excess air to atmosphere once preset pressure is reached

A. By bypassing air to the compressor inlet

C. By opening the isolation valve automatically

Why are stack pipes used inside pneumatic storage bottles?

A. To prevent sediment or moisture from entering the system

B. To equalise pressure between bottles

C. To allow high-pressure charging from any point

What is the function of the pressure maintaining valve?

A. To maintain minimum pressure for essential services during pressure loss

B. To prevent overcharging of storage bottles

C. To equalise pressures between main and emergency circuits

Why are pressure reducing valves necessary in some pneumatic systems?

B. To protect components designed for lower operating pressures

A. To save air during low-demand operation

C. To allow more air to enter the high-pressure system

Which safety precaution is critical before loosening any pneumatic fitting?

B. Ensure the system is depressurised

A. Ensure the component is isolated

In a turbine bleed air system, when is 13th stage bleed air used?

B. When 8th stage bleed cannot meet demand

A. When additional cooling is required

What is the role of the pre-cooler valve in the bleed air system?

To regulate bleed air temperature using fan air

To reduce system pressure to a safe level

To route air to the air conditioning system bypass

What does the bleed thermostat do if duct temperature reaches 230°C?

B. Reduces control air pressure to modulating valve to reduce airflow

A. Opens the engine bleed valve fully

C. Activates over-temperature cockpit warning

How is potable water pressurised in some aircraft?

By bleed air through a pressure reducing valve

By gravity feed from the fuselage tank

What is the main purpose of the purge valve in the air cleaner system?

B. To exhaust collected dirt particles to atmosphere

A. To regulate compressor output

C. To bypass the air cleaner during high demand

Why are duct leak detection systems essential in bleed air systems?

B. To detect overheating due to leaks that may cause fires

A. To prevent corrosion in ducts

How does a bi-metallic duct leak detector operate?

B. By expanding outer shell to close contacts and complete a circuit

A. By producing a voltage change with temperature rise

C. By sensing airflow changes in the duct

In the control cabin, what is the purpose of the isolation valve in a twin-engine pneumatic system?

A. To link both systems for crossfeed or isolate them during faults

B. To balance pressures between engines

C. To shut off air to the cockpit only

When refitting duct seals, what precaution should be taken to avoid damage?

B. Cover threads with a sleeve or tape when passing seals over

C. Install seals before aligning ducts

Oxygen & Pneumatic System Quiz

Authored by Nurfarah Aishah Hasli

Engineering

Professional Development

Used 10+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Aircraft that fly above 18000 ft have

pressure demand system

diluter demand system

diluter pressure system

pressure diluter system

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Aircraft that flying at very high altitude where the pressure is too low use

pressure demand system

diluter demand system

diluter pressure system

pressure diluter system

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Oxygen can be safe when

the grease and oil is not around

handled during smoking

the oxygen is mixed

not follow correct manual

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Pilot and co-pilot use

chemically oxygen generated system

gaseous oxygen system

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When the mask is withdrawn

a yellow oxygen flag will appear

a red oxygen flag will appear

a green oxygen flag will appear

a blue oxygen flag will appear

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Selector button that allow pure undiluted oxygen to flow is

30%

50%

100%

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The passenger oxygen mask will be found in

Passengger System Unit

Passenger Service Unit

Passenger Oxygen Unit

Passenger Personal Unit

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Oxygen & Pneumatic System Quiz

Aircraft that fly above 18000 ft have

Aircraft that flying at very high altitude where the pressure is too low use

Oxygen can be safe when

Pilot and co-pilot use

When the mask is withdrawn

Selector button that allow pure undiluted oxygen to flow is

The passenger oxygen mask will be found in

The max pressure to be delivered to the passenger is

The high pressure form the oxygen bottle will be reduce by

Pressure relief valve is to

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