Oxygen Systems

Question 1

In the cabin, when the oxygen mask is pulled downwards, the passenger breathes :

Answer 1

a mixture of oxygen and cabin air.

Question 2

If needed, must the cargo hold be able to be pressurised?

Answer 2

Yes

Question 3

The maximum allowable cabin altitude at the aircraft’s cruising altitude is?

Answer 3

8 000ft

Question 4

The cabin sink rate limit is -

Answer 4

300fpm

Question 5

The cabin climb rate is -

Answer 5

500fpm

Question 6

For providing pressurisation in reciprocating aeroplanes, the simplest method, all though it has a lot of disadvantages, is drawing compressed air from -

A more acceptable method of providing pressurisation is through independent cabin compressors, which are usually either:

Answer 6

the turbocharger or the supercharger

1. a centrifugal compressor
2. a positive displacement type of compressor, of which the roots-type blower is the most popular.

Question 7

If the aircraft is turbine powered, pressurisation is achieved by using -

Answer 7

compressor bleed air

Question 8

The maximum altitude at which an aeroplane may operate is determined by -

Answer 8

the differential pressure

Question 9

Positive differential describes a condition in which -

Answer 9

cabin pressure is higher than ambient pressure

Question 10

Negative differential describes a condition in which

Answer 10

cabin pressure is lower than ambient pressure

Question 11

The pressurising source, be it a compressor or bleeds, will provide much more air than is generally required. The method of control is through -

Answer 11

an outflow valve

Question 12

The outflow valve is automatically operated once -

But may also be -

Answer 12

limiting condition are reached

Manually operated

Question 13

Which type of cabin air pressure valve?

This prevents cabin pressure from exceeding a predetermined differential pressure above ambient, ie cabin pressure is reduced to prevent the fuselage from exploding

Answer 13

Pressure relief valve

Question 14

Which type of cabin air pressure valve?

This prevents the ambient pressure from exceeding the cabin pressure, ie cabin pressure is increased to prevent the fuselage from collapsing

Answer 14

Vacuum relief valve

Question 15

The system which in most aeroplanes is provided only to flight crew, and is independent of the cabin system?

Answer 15

Diluter Demand System

Question 16

The diluter demand oxygen is stored -

Answer 16

In high pressure cylinders

Question 17

Below 32 000ft, to conserve oxygen, the oxygen of the diluter demand system is -

Answer 17

mixed with cabin ambient air

Question 18

relevant to the diluter demand system, the “emergency” mode serves to?

Answer 18

supply 100% oxygen from the cylinders, thus no cabin air is inhaled.

Question 19

The chemical, or solid state oxygen system can produce oxygen for -

Answer 19

15 minutes

Question 20

The life of an oxygen cylinder is usually -

Answer 20

5 years

Question 21

A substance which may never be used in the vicinity or on parts of an oxygen installation is :

Answer 21

grease

Question 22

The state in which the breathing oxygen for the cockpit of jet transport aeroplanes is stored is :

Answer 22

Gaseous.

Question 23

The purpose of the “Pressure Relief Valve” in a high pressure oxygen system is to :

Answer 23

relieve overpressure if the pressure reducing valve malfunctions