Vol.3

Question 1

In its natural state, oxygen is what?

Answer 1

Tasteless, odorless, colorless

Question 2

What gaseous system valve type prevents a complete loss of oxygen?

Answer 2

Check

Question 3

The supply and distribution tubing for aircraft oxygen systems is identified by a cellulose tape that is what?

Answer 3

Green and white

Question 4

What is the disadvantage of a continuous-flow oxygen regulator?

Answer 4

Wastes oxygen

Question 5

What does the molecular sieve oxygen generating system concentrator supply to the OXYGEN regulator control panel?

Answer 5

93% oxygen-enriched gas

Question 6

What is the expansion rate that LOX converts to GOX?

Answer 6

860 to 1

Question 7

Except during servicing, the LOX system’s combination fill, buildup, and vent valve is always in what position?

Answer 7

Buildup position

Question 8

On an aircraft LOX system, the handle on a manually operated buildup and vent valve is designed to prevent what?

Answer 8

The filler access door from closing in the vent position

Question 9

Bleed air is usually taken from which part of of the engine section?

Answer 9

Compressor

Question 10

What determines aircraft engine temperature and pressure as it applies to the bleed air system?

Answer 10

Engine throttle setting and ambient temperature

Question 11

What is the purpose of the engine bleed air check valves?

Answer 11

Prevent the loss of compressed bleed air

Question 12

What engine bleed air component prevents loss of air through the engine when it is shutdown?

Answer 12

Shutoff valve

Question 13

What is the ducting for high-pressure/high temperature air-conditioning usually made of?

Answer 13

Stainless steel

Question 14

What tool is use to ensure alignment and sealing when installing a V-band clamp on air-conditioning ducting?

Answer 14

Rawhide mallet

Question 15

What type of high-pressure/high-temperature ducting does not require a gasket?

Answer 15

Compressible flange

Question 16

What type of lubricant can be used on a beaded channel clamp sleeve to ease installation?

Answer 16

Water

Question 17

What is the crush-type gasket used in aircraft ducting made of?

Answer 17

A soft aluminum, or fiber and metal mesh

Question 18

What are expansion joints in bleed air systems best used for?

Answer 18

A short run of ducting

Question 19

What prevents fiberglass fabric ducts from swelling when the aircraft climbs to high altitudes?

Answer 19

Vent holes

Question 20

What is defined as “a depression in the duct wall, where the surface of the material isn’t cut or removed but the depression has caused sharp bends or creases in the material?”

Answer 20

Major dent

Question 21

“The simultaneous control of temperature, humidity, and air distribution within a space” is the definition of what?

Answer 21

Air conditioning

Question 22

What aircraft air conditioning component is a radiator that cold ram air passes through in order to cool the hot bleed air from the engines?

Answer 22

Primary heat exchanger

Question 23

What aircraft air conditioning system component controls the flow of ram air through the primary heat exchangers?

Answer 23

Movable inlet and exit doors

Question 24

What does the rapid cooling of bleed air cause?

Answer 24

Moisture to condense in the form of fog

Question 25

As bleed air enters the compressor of the air cycle machine, it's pressure is increased. With the increase in pressure, there is also an increase in temperature. Which component removes most of this increased temperature?

Answer 25

Secondary heat exchanger

Question 26

What does the low atmospheric pressure found at extremely high altitudes cause a person's blood vessels to do?

Answer 26

Rupture

Question 27

What controls the action of the outflow valve in a fixed-isobaric, single-differential pressurization system?

Answer 27

Regulating control chamber pressure

Question 28

What are the parts of the isobaric section of the cabin pressure regulator?

Answer 28

Aneroid, spring, and metering valve

Question 29

What are the components of the differential section of the cabin pressure regulator?

Answer 29

Diaphragm, spring, and metering valve

Question 30

What maintains pressure if the dual-differential cabin pressure regulator fails during flight?

Answer 30

The outflow valves

Question 31

What is the purpose of the pneumatic relay in a cabin pressurization system?

Answer 31

Ensure that both outflow valves operate at the same time

Question 32

In a variable isobaric pressurization system, when is the manual control valve used as an alternate?

Answer 32

When the cabin pressure controller fails

Question 33

What is the normal connection for thermal switches in a fire warning system?

Answer 33

In series with the warning light and parallel with each other

Question 34

What is the fire detector that is frequently used in fire warning systems that has a high-nickel steel rod located along the centerline of a stainless steel tube assembly called?

Answer 34

an Iron Fireman switch

Question 35

What is the rate that the DC voltage supplied to the lights in a photoelectric circuit is pulsed at?

Answer 35

10 Hz

Question 36

How does a liquid fire extinguishing agent douse a fire?

Answer 36

By excluding oxygen from the area

Question 37

Why is a gaseous nitrogen charge added to a liquid to a liquid fire extinguishing agent?

Answer 37

to expel the agent from the bottle

Question 38

What liquid-agent fire extinguisher container component holds in both the liquid agent and the nitrogen charge?

Answer 38

Frangible disc

Question 39

In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie-shaped sections?

Answer 39

To prevent smaller pieces from passing through the strainer