Cdc Vol. 3

Front 1

In its natural state, oxygen is

Back 1

Tasteless, colorless, odorless

Front 2

What GOX 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 MSOGS concentrator supply to the oxygen regulator control panel

Back 5

93% oxygen

Front 6

LOX converts to GOX at an expansion ratio of

Back 6

860 to 1

Front 7

Except during servicing, the LOX system's combination fill, buildup, and vent valve is always in the

Back 7

Buildup position

Front 8

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

Back 8

The filler access door from closing the vent position

Front 9

Bleed air is usually taken from which part of the engine

Back 9

Compressor

Front 10

Aircraft engine temperature and pressure as it applies to the bleed air system is determined by the

Back 10

Engine throttle setting and ambient temperature

Front 11

What is the purpose of the EBA check valves

Back 11

Prevent loss of compressed bleed air

Front 12

The ducting for high pressure/high temperature air conditioning is usually made of

Back 12

Stainless steel

Front 13

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

Back 13

Rawhide mallet

Front 14

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

Back 14

Compressible flange

Front 15

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

Back 15

Water

Front 16

The crush type gasket used in aircraft ducting is made of

Back 16

Soft aluminum, or fiber and metal mesh

Front 17

Expansion Joints in bleed air systems are best used for

Back 17

A long run of ducting

Front 18

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

Back 18

Vent holes

Front 19

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

Back 19

Major dent

Front 20

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

Back 20

Air conditioning

Front 21

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 21

Primary heat exchanger

Front 22

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

Back 22

Movable inlet and exit doors

Front 23

Rapid cooling of bleed air causes

Back 23

Moisture to condense in the form of fog

Front 24

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

Back 24

Secondary heat exchanger

Front 25

The low atmospheric pressure found at extremely high altitudes can cause a person's blood vessels to

Back 25

Rupture

Front 26

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

Back 26

Regulating control chamber pressure

Front 27

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

Back 27

Diaphragm, fulcrum, and aneroid

Front 28

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

Back 28

Spring, metering valve, and aneroid

Front 29

What maintains pressure if the Dual differential cabin pressure regulator fails during flight

Back 29

The outflow valves

Front 30

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

Back 30

Ensure that both outflow valves are operating at the same time

Front 31

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

Back 31

Cabin pressure controller fails

Front 32

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

Back 32

Each other only

Front 33

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 33

An iron fireman switch

Front 34

The direct current voltage supplied to the lights in a photoelectric circuit is pulsed at a rate of

Back 34

10 Hz

Front 35

Liquid fire extinguisher agent douses fire by

Back 35

Excluding oxygen from the area

Front 36

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

Back 36

Expel the agent from the bottle

Front 37

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

Back 37

Frangible disk

Front 38

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

Back 38

Prevent small pieces from passing through the strainer

Front 39

What is usually located at the lowest point in a fuel tank

Back 39

Sump and drain

Front 40

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

Back 40

Rubber or nylon material

Front 41

Wing tanks are

Back 41

Sealed off parts of the wing structure

Front 42

A centrifugal type aircraft fuel pump may be used

Back 42

For boost, transfer, or air refueling operations

Front 43

What type of fuel pump must have a fuel and vapor proof housing

Back 43

Centrifugal pump with electrically driven, direct current, series wound motor

Front 44

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

Back 44

Dual impeller

Front 45

In a dual impeller fuel pump what prevents foreign objects from holding the bypass valve open

Back 45

An inlet screen

Front 46

What air refueling pump components depend on fuel for lubrication

Back 46

Bearings

Front 47

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

Back 47

Rotor

Front 48

The arrow stamp on the body of a fuel system check valve indicates the

Back 48

Direction of free flow

Front 49

Pressure loaded fuel system check valve is used

Back 49

When gravity flow through the valve is undesirable

Front 50

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

Back 50

Spring loaded relief valves

Front 51

The rotary plug valve can be removed and replaced

Back 51

Without draining the fuel lines or tanks

Front 52

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

Back 52

Secondary seal sleeve

Front 53

Another name for the disk type valve in a fuel system is

Back 53

Butterfly

Front 54

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

Back 54

Spring

Front 55

Some fuel level control valves have a dual float system so that

Back 55

There will be a double safety factor

Front 56

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

Back 56

Check valve

Front 57

Fuel control switches normally control circuits that indicate

Back 57

Fuel flow, fuel level, and fuel pressure

Front 58

What most likely controls the Automatic Pump shut off when all fuel is depleted from a fuel tank

Back 58

Float switches

Front 59

In a direct current, liquid level fuel indicating system, what positions the wiper contact on the resistance strip

Back 59

Movement of a float in the tanks

Front 60

What capacitance type, fuel indicating system component allows for changes in fuel density

Back 60

Compensator

Front 61

What prevents a fuel tank from collapsing if an air pressure regulator fails and excessive negative pressure builds up

Back 61

Pressure/vacuum relief valve

Front 62

A well-designed aircraft fuel system will ensure

Back 62

Positive and reliable fuel flow under all conditions

Front 63

The three types of shutoff valves used in the cross feed fuel system are the

Back 63

Sliding gate, rotary plug, and disc

Front 64

The three methods of transferring fuel are gravity flow,

Back 64

Air pressure, and pump

Front 65

What is the basic purpose of the fuel vent system

Back 65

Prevent fuel tank rupture or collapse

Front 66

Most prevalent method of refueling for ground servicing is

Back 66

Single point

Front 67

The air refueling receptacle is operated

Back 67

Hydraulically, but controlled electrically

Front 68

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

Back 68

Viscosity

Front 69

What type of foreign particle appears in the fuel in a crystalline, granular, or glass-like form

Back 69

Sand or dust

Front 70

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

Back 70

Microbial growth

Front 71

Specs or granules of sediment and fuel that are visible to the naked eye are approximately how many microns or larger

Back 71

40

Front 72

Classification of fuel leaks is necessary in order to determine

Back 72

Whether or not they constitute a flight safety hazard

Front 73

How are fuel leaks categorized

Back 73

Class A through D

Front 74

Leak limits correspond to the

Back 74

Leak category and fuel type

Front 75

In addition to the Air Force Technical Order form 781A or AFTO form 781K what form must you use to document fuel leaks when automatic data systems are not available

Back 75

AFTO Form 427

Front 76

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

Back 76

Inertia

Front 77

The ability to do work is the definition of

Back 77

Energy

Front 78

An aircraft taxiing at a constant speed is an example of

Back 78

Newton's First Law of Motion

Front 79

Which of Newton's Laws of Motion is the best description of why and operating jet engine produces forward thrust

Back 79

Third

Front 80

In a jet engine, what meters the fuel for combustion

Back 80

Fuel control

Front 81

When the turbine wheel absorbs the fuel energy, the energy

Back 81

Returns to the compressor

Front 82

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

Back 82

Increases pressure

Front 83

Air and gases flowing through a jet engine require

Back 83

Greater velocity exiting than entering

Front 84

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

Back 84

Nozzle diaphragm

Front 85

A jet engine derives its name from the fact that

Back 85

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

Front 86

What are the two types of jet engine compressors

Back 86

Centrifugal and axial flow

Front 87

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

Back 87

Fuel control

Front 88

What is the purpose of a front-mounted fan in an axial flow jet engine compressor

Back 88

Increase the thrust and send air through the compressor core

Front 89

Combustion effectiveness of the gas turbine is usually between

Back 89

95 and 100 percent

Front 90

Engine design helps prevent ignitor plug fouling by

Back 90

Directing air around the plug electrode

Front 91

What forms the inner and outer surfaces of an annular type combustion chamber

Back 91

Interlocking stainless steel bands

Front 92

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

Back 92

Drained overboard by a drain system

Front 93

Three turbines used in jet engines are

Back 93

Impulse, reaction, and reaction impulse

Front 94

On some jet engines, what secures the turbine bucket in place

Back 94

Lock strips

Front 95

Exhaust ducts connect the turbine outlet and the

Back 95

Jet nozzle

Front 96

What is the purpose of the exhaust duct

Back 96

Straighten exhaust gas flow

Front 97

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

Back 97

Segmented flap

Front 98

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

Back 98

Turbo jet

Front 99

What augmenter component creates local turbulence and reduces gas velocity

Back 99

Flameholder

Front 100

Turbofan engine with a bypass ratio of 3:1 is classified as

Back 100

Medium bypass

Front 101

The primary function of hydro mechanical fuel control on a jet engine is to

Back 101

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

Front 102

What type of fuel control use thermocouples, relays, amplifiers, and solenoids, to help control the engine

Back 102

Electrohydromechanical

Front 103

When classified according to structure, what of the following is not a type of oil pump.

Gear, Gerotor, Rotogear, Sliding vane

Back 103

Rotogear

Front 104

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

Back 104

Gerotor

Front 105

A micron is a metric linear measurement equal to

Back 105

1/25,000 of an inch

Front 106

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

Back 106

Fuel/oil

Front 107

What do you use to create a static seal between two stationary parts in a oil system

Back 107

Gasket

Front 108

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

Back 108

Compressor

Front 109

The air turbine (impingement) starter used on jet engines has the advantages of

Back 109

Less weight and fewer moving parts than other starters

Front 110

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

Back 110

An over-running clutch

Front 111

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

Back 111

Power takeoff (PTO) shaft

Front 112

What jet engine alternating current ignition system unit develops 20,000 volts delivered to the igniter plugs

Back 112

Transformer

Front 113

A simple direct current ignition system consist of

Back 113

Vibrator, igniter plugs, and transformer

Front 114

Jet engine tachometer gauges are calibrated in percent of

Back 114

Maximum RPM

Front 115

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

Back 115

Variable thrust output

Front 116

Exhaust gas temperature indicators indicate the engine EGT in

Back 116

Degrees Celsius

Front 117

The three benefits of the Joint Oil Analysis Program (JOAP) are improved safety, reduced maintenance cost, and

Back 117

Increased equipment availability

Front 118

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

Back 118

Less unnecessary maintenance

Front 119

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

Back 119

Goggles and gloves

Front 120

What indicates lubricant system contamination by dirt and sand

Back 120

An increase in Silicon

Front 121

What form should you fill out and submit to the non-destructive inspections (NDI) laboratory with all oil samples

Back 121

DD Form 2026

Front 122

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

Back 122

Rotational and centrifugal forces