2Ax5Xn Cdc Vol. 3

Front 1

in its natural state oxygen is

Back 1

tasteless, colorless and oderless

Front 2

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

Back 2

check

Front 3

the supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape that is

Back 3

green and white

Front 4

the disadvantage of a continuous flow oxygen regulator is that it

Back 4

wastes oxygen

Front 5

what does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the oxygen regulator control panel

Back 5

93 percent oxygen enriched gas

Front 6

liquid oxygen converts to gaseous oxygen at an expansion ratio of

Back 6

680 to 1

Front 7

except during servicing, the liquid oxygen systems combination fill, buildup and vent valve is always in the

Back 7

buildup position

Front 8

on an aircraft liquid oxygen system, the handle on a manually operated buildup and vent valve is designed to prevent

Back 8

the filler access door from closing in the vent position

Front 9

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

Back 9

compressor

Front 10

aircraft engine temp and pressure as it applies to the bleed air system is determined by the

Back 10

engine throttle setting and ambient temp

Front 11

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

Back 11

prevent the loss of compressed bleed air

Front 12

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

Back 12

shutoff valve

Front 13

the ducting for high pressure/high temp air conditioning is usually made of

Back 13

stainless steel

Front 14

what tool do you use to ensure alignment and sealing when installing a v-band clamp on air conditioning ducting?

Back 14

rawhide mallet

Front 15

what type of high pressure/ high temp ducting does not require a gasket?

Back 15

compressible flange

Front 16

what lubricant can be used on a beaded channel clamp sleeve to ease installation?

Back 16

water

Front 17

the crush type gasket used in aircraft ducting is made of

Back 17

a soft aluminum, or fiber and metal mesh

Front 18

expansion joints in bleed air systems are best used for

Back 18

a short run of ducting

Front 19

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

Back 19

vent holes

Front 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?"

Back 20

major dent

Front 21

"the simultaneous control of temp, humidity, and air distribution within a space" is the definition of

Back 21

air conditioning

Front 22

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

Back 22

primary heat exchanger

Front 23

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

Back 23

movable inlet and exit doors

Front 24

the rapid cooling of bleed air causes

Back 24

moisture to condense in the form of fog

Front 25

as bleed air enters the compressor of the air cycle machine, its pressure is increased. with the increase in pressure, there is also an increase in temp. which component removes most of this increased temp?

Back 25

secondary heat exchanger

Front 26

the low atmospheric pressure found at extremely high altitudes can cause a persons blood vessels to

Back 26

rupture

Front 27

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

Back 27

regulating control chamber pressure

Front 28

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

Back 28

an aneroid, spring and metering valve

Front 29

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

Back 29

a diaphragm, spring and metering valve

Front 30

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

Back 30

the outflow valves

Front 31

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

Back 31

ensure that both outflow valves operate at the same time

Front 32

in the variable isobaric pressurization system. the manual control valve is used as an alternate when the

Back 32

cabin pressure controller fails

Front 33

the normal connection for the thermal switches in a fire warning system is in series with

Back 33

the warning light and parallel with each other

Front 34

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

Back 34

an iron fireman switch

Front 35

the dc voltage supplied to the lights in a photoelectric circuit is pulsed at a rate of

Back 35

10 hz

Front 36

a liquid fire extinguishing agent douses a fire by

Back 36

excluding oxygen from the area

Front 37

a gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to

Back 37

expel the agent from the bottle

Front 38

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

Back 38

frangible disc

Front 39

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

Back 39

prevent small pieces from passing through the strainer

Front 40

what is usually located at the lowest point in a fuel tank?

Back 40

sump and drain

Front 41

a bladder type tank conforms to the shape of the vacant cavity within the fuselage because it is made out of

Back 41

rubber or nylon material

Front 42

wing tanks are

Back 42

sealed-off parts of the wing structure

Front 43

a centrifugal-type aircraft fuel pump may be used

Back 43

for boost, transfer or air refueling operations

Front 44

what type of fuel pump must have a fuel and vapor proof housing?

Back 44

centrifugal pump with electrically driven, dc series-wound motor

Front 45

what kind of centrifugal pump is used when a fuel supply is required during periods of negative gravity conditions?

Back 45

dual-impeller

Front 46

in a dual-impeller fuel pump, what prevents foreign objects from holding the bypass valve open

Back 46

an inlet screen

Front 47

what air refueling pump components depend on fuel for lubrication?

Back 47

bearings

Front 48

what air refueling pump component removes fuel vapors caused by the centrifugal force of the impellers?

Back 48

rotor

Front 49

the arrow stamped on the body of a fuel system check valve indicates the

Back 49

direction of free flow

Front 50

a pressure-loaded fuel system check valve is used

Back 50

when gravity flow through the valve is undesirable

Front 51

the fuel system components that prevent excessive pressure from building up in trapped lines or within the valve body are three

Back 51

spring-loaded relief valves

Front 52

the rotary plug valve can be removed and replaced

Back 52

without draining the fuel lines or tanks

Front 53

what rotary plug valve part rotates and seals off the passage of fuel during plug valve removal?

Back 53

secondary seal sleeve

Front 54

another name for the disc type valve in a fuel system is

Back 54

swivel vane

Front 55

in a piston-type, fuel level control valve, what aids piston closure and prevents fuel from entering the tank?

Back 55

spring

Front 56

some fuel level control valves have a duel-float system so that

Back 56

there will be a double safety factor

Front 57

the low-level shutoff valve prevents the reverse flow of fuel through the valve by what type of action?

Back 57

check valve

Front 58

fuel-controlled switches normally control circuits that indicate

Back 58

all of the above. fuel flow, level and pressure

Front 59

what most likely controls the automatic pump shutoff when all fuel is depleted from a fuel tank?

Back 59

float switches

Front 60

in a dc, liquid-level fuel indicating system, what positions the wiper contact on the resistance strip?

Back 60

the movement of a float in the tanks

Front 61

what capacitance-type, fuel-indicating system component allows for changes in fuel density?

Back 61

compensator

Front 62

what prevents a fuel tank from collapsing if an air pressure regulator fails and excessive negative pressure develops?

Back 62

pressure/vacuum relief valve

Front 63

a well designed aircraft fuel system will ensure

Back 63

positive and reliable fuel flow under all conditions

Front 64

the three types of shutoff valves used in the crossfeed fuel system are the

Back 64

sliding gate, rotary plug and disc

Front 65

the three methods of transferring fuel are gravity flow,

Back 65

air pressure and pump

Front 66

what is the basic purpose of the fuel vent system?

Back 66

prevent fuel tank rupture or collapse

Front 67

the most prevalent method of refueling for ground servicing is

Back 67

single point

Front 68

the air refueling receptacle is operated

Back 68

hydraulically, but controlled electrically

Front 69

fuels ability to hold contaminants in suspension is increased with a higher

Back 69

viscosity

Front 70

what type of foreign particle appears in the fuel in a crystalline, granular or glasslike form?

Back 70

sand or dust

Front 71

which type of fuel contaminant can form a red, brown, gray or black slime in the fuel?

Back 71

microbial growth

Front 72

specks or granules of sediment in fuel that are visible to the naked eye are approximately how many microns or larger?

Back 72

40

Front 73

classification of fuel leaks is necessary in order to determine

Back 73

whether or not they constitute a flight safety hazard

Front 74

how are fuel leaks categorized?

Back 74

class A through D

Front 75

leak limits correspond to the

Back 75

leak category and fuel type

Front 76

in addition to the air force technical order (AFTO) form 781A or AFTO form 781K, what form must you use to document fuel leaks when automatic data systems are not available?

Back 76

AFTO form 427

Front 77

the resistance of an object to change its motion is a property of matter called

Back 77

inertia

Front 78

the ability to do work is the definition of

Back 78

energy

Front 79

an aircraft taxiing at a constant speed is an example of

Back 79

newtons first law of motion

Front 80

which of newtons laws of motion is the best description of why an operating jet engine produces forward thrust?

Back 80

third

Front 81

in a jet engine, what meters the fuel for combustion?

Back 81

fuel control

Front 82

when the turbine wheel absorbs the fuel energy,

Back 82

the energy returns to the compressor

Front 83

what effect does the divergent design of a jet engine diffuser have on pressure?

Back 83

increases pressure

Front 84

air and gases flowing through a jet engine require

Back 84

greater velocity exiting than entering

Front 85

when a jet engine uses two or more turbine wheels, what is placed directly in front of each turbine wheel?

Back 85

nozzle diaphragm

Front 86

a jet engine derives its name fro the fact that

Back 86

it uses a exhaust gas driven turbine wheel to drive its compressor

Front 87

what are the two types of jet engine compressors?

Back 87

centrifugal and axial-flow

Front 88

after air is drawn into the guide vanes of a centrifugal jet engine compressor, it is subjected to

Back 88

rotational and centrifugal forces

Front 89

what determines the N2 compressor rotations per minute of a dual spool jet engine compressor?

Back 89

fuel control

Front 90

what is the purpose of a front mounted fan in an axial flow jet engine compressor?

Back 90

increase thrust and send air through the compressor core rotor

Front 91

the combustion efficiency of a gas turbine is usually between

Back 91

95 and 100 %

Front 92

engine design helps prevent igniter plug fouling by

Back 92

directing air around the plug electrode

Front 93

what forms the inner and outer surfaces of an annular-type combustion chamber?

Back 93

interlocking stainless steel bands

Front 94

fuel that accumulates after a failed start or after engine shutdown is

Back 94

drained overboard by a drain system

Front 95

the three turbine designs used in a jet engines are

Back 95

impulse, reaction and reaction-impulse

Front 96

on some jet engines, what secures the turbine bucket in place?

Back 96

lock strips

Front 97

the exhaust duct connects the turbine outlet and the

Back 97

jet nozzle

Front 98

what is the purpose of the exhaust duct?

Back 98

straighten exhaust gas flow

Front 99

one common type of variable area orifice used on augmenters is the

Back 99

segmented flap

Front 100

what augmenter component creates local turbulence and reduces gas velocity?

Back 100

flameholder

Front 101

which engine type used a lot during the early years of jet engine design is the most basic turbine engine design?

Back 101

turbojet

Front 102

a turbofan engine with a bypass ration of 3:1 is classified as

Back 102

medium bypass

Front 103

the primary function of a hydromechanical fuel control on a jet engine is to

Back 103

meter the fuel, making certain that the engine gets the correct quantity for combustion at all times

Front 104

what type of fuel control uses thermocouples, relays, amplifiers and solenoids to help control the engine?

Back 104

electrohydromechanical

Front 105

the purpose of a fuel/oil cooler in a fuel system is to

Back 105

heat the fuel and cool the oil

Front 106

when classified according to structure, which of the following is not a type of an oil pump?

Back 106

rotogear

Front 107

what jet engine oil pump consists of a gear and rotor within a housing?

Back 107

gerotor

Front 108

a micron is a metric linear measurement equal to

Back 108

1/25,000 of an inch

Front 109

the two types of oil coolers used in jet engine oil systems are air/oil and

Back 109

fuel/oil

Front 110

what do you use to create a static seal between two stationary parts in the oil system?

Back 110

gasket

Front 111

what engine component must be rotated to a predetermined speed in order for a jet engine starter to be considered effective?

Back 111

compressor

Front 112

the air turbine (impingement) starter used on jet engines

Back 112

has the advantages of less weight and fewer moving parts than other starters

Front 113

the cartridge-pneumatic starter is a gas-driven turbine wheel coupled to the engine through a reduction gear system and

Back 113

an overrunning clutch

Front 114

in a gearbox type starter system, what transmits the torque supplied by the jet fuel starter (JFS) to the engine gearbox?

Back 114

power takeoff (PTO) shaft

Front 115

what jet engine AC ignition system unit develops 20,000 volts delivered to the igniter plugs?

Back 115

transformer

Front 116

a simple DC ignition system consists of

Back 116

vibrator, igniter plugs and transformer

Front 117

jet engine tachometer gauges are calibrated in percent of

Back 117

maximum RPM

Front 118

the purpose of the jet engine pressure ratio (EPR) indicating system is to give a reference to the engines

Back 118

available thrust output

Front 119

exhaust gas temp (EGT) indicators indicate the engine EGT in

Back 119

degrees Celsius

Front 120

the three benefits of the joint oil analysis program (JOAP) are improved safety, reduced maintenance cost and

Back 120

increased equipment availability

Front 121

through the use of spectrometric oil analysis, aircraft will have a higher in-commission rate because there will be

Back 121

less unnecessary maintenance

Front 122

at a minimum, what should you wear when taking an oil sample?

Back 122

goggles and gloves

Front 123

what indicates lubricant system contamination by dirt and sand?

Back 123

an increase in silicon

Front 124

what form must you fill out and submit to the NDI laboratory with all oil samples?

Back 124

DD Form 2026