POWERPLANT 2

Question 1

Types of Jet Propulsion

Answer 1

Rocket
Ramjet
Pulsejet
Gas Turbine

Question 2

A __________ is a non-air-breathing engine
that carries its own fuel and the oxygen
needed for the fuel to burn.

Answer 2

rocket

Question 3

The two types of rockets

Answer 3

solid-propellant rockets
and liquid- propellant rockets

Question 4

_____________ rockets use a solid fuel formed into a specific shape that promotes an optimum burning rate when mixed with an oxidizer.

Answer 4

Solid-propellant

Question 5

__________ rockets are used primarily to propel some military weapons and occasionally to provide additional thrust for takeoff of heavily loaded aircraft.

Answer 5

Solid fuel

Question 6

type of rocket which uses fuel and an oxidizing
agent such as liquid oxygen.

Answer 6

liquid-fuel rocket

Question 7

A ________ is an athodyd (or aero-thermodynamic duct), an air-breathing engine with no moving parts.

Answer 7

ramjet

Question 8

A _________ must be moving forward at high velocity before it can produce thrust. Their use is limited

Answer 8

ramjet

Question 9

_______ engines are similar to ramjets except that the air intake duct is equipped with a series of shutter valves that are spring-loaded to the open position.

Answer 9

Pulsejet

Question 10

A ______ is typically considered more useful than a ramjet because pulsejets can produce thrust prior to achieving a high forward speed

Answer 10

pulsejet

Question 11

The ______________ is the most practical form of jet engine in use today.

Answer 11

gas turbine engine

Question 12

has become the standard on nearly all commercial (transport category), business, and military aircraft.

Answer 12

turbine engine

Question 13

4 TYPES OF GAS TURBINE ENGINE

Answer 13

Turbojet Engines
TurboPropeller Engines
Turboshaft Engines
Turbofan Engines

Question 14

The basic operating principles of a ______________ are straightforward.

Answer 14

turbojet engine

Question 15

A gas turbine engine that delivers power to a propeller is referred to as a ____________

Answer 15

turbopropeller, or turboprop engine.

Question 16

_____________ are similar in design to turbo jet engines except that the power produced by a turboprop engine is delivered to a reduction gear system that spins a propeller.

Answer 16

Turboprop engines

Question 17

________________ are used extensively in business and commuter aircraft because the combination of jet power and propeller efficiency provides good performance characteristics at speeds between 300 and 400 miles per hour

Answer 17

Turboprop engines

Question 18

A gas turbine engine that delivers power to a shaft that can drive something else is referred to as a ____________.

Answer 18

turboshaft engine

Question 19

Many helicopters use a __________ gas turbine
engine.

Answer 19

turboshaft

Question 20

___________________ are widely used as auxiliary power units and, in industrial applications, to drive electrical generators and surface transportation systems

Answer 20

turboshaft engines

Question 21

The output of a turboprop or turboshaft engine is measured by ___________ rather than thrust.

Answer 21

shaft horsepower

Question 22

A ________________ consists of a multibladed, ducted propeller driven by a gas turbine engine.

Answer 22

turbofan engine

Question 23

______________ were developed to provide a compromise between the best features of the turbojet and the turboprop.

Answer 23

Turbofans

Question 24

A _____________ can have the fan mounted either in the front or back of the engine.

Answer 24

turbofan engine

Question 25

Inlet air passing through a turbofan engine is usually divided into two separate ________________.

Answer 25

streams of air

Question 26

One stream _______ through the engine core, and a second stream _____________ the engine core.

Answer 26

passes coaxially bypasses

Question 27

3 terms

Answer 27

thrust ratio bypass ratio fan pressure ratio.

Question 28

A turbofan engine's ______ ratio is a comparison of the thrust produced by the fan to the thrust produced by the engine core exhaust.

Answer 28

thrust

Question 29

Turbofan's _______ ratio refers to the ratio of incoming air that bypasses the core to the amount of air that passes through the engine core.

Answer 29

bypass

Question 30

Turbofans in civil aircraft are generally divided into three classifications based on bypass ratio:

Answer 30

low bypass medium bypass high bypass

Question 31

low bypass ratio

Answer 31

1:1

Question 32

medium bypass

Answer 32

2:1 or 3:1

Question 33

high bypass

Answer 33

4:1 or greater

Question 34

________________ determines a fan 's bypass ratio and thrust ratio.

Answer 34

Fan diameter

Question 35

The ratio of air pressure leaving the fan to the air pressure entering the fan

Answer 35

fan pressure ratio

Question 36

____________ is the ratio of a blade's length to its width, or chord.

Answer 36

Aspect ratio

Question 37

The seven basic sections of gas turbine engine

Answer 37

* Air inlet duct * Compressor section * Combustion section * Turbine section * Exhaust section * Accessory section

Question 39

The ___ section includes the combustion, turbine, and exhaust sections.

Answer 39

hot

Question 40

The _____ section includes the air inlet duct and the compressor section.

Answer 40

cold

Question 41

The ____________ provides a uniform supply of air to the compressor for efficient operation.

Answer 41

air inlet duct

Question 42

The _____________ on a turbojet engine is normally considered part of the airframe, not the powerplant.

Answer 42

air inlet duct

Question 43

the air inlet duct is located directly in front of the compressor and is mounted to the engine.

Answer 43

Engine-Mounted Inlets

Question 44

Typically, ____________ inlet ducts are positioned near the wing root area.

Answer 44

wing-mounted

Question 45

Engines mounted inside a fuselage typically use air inlet ducts located near the front of the fuselage.

Answer 45

Fuselage-Mounted Inlets

Question 46

Some military aircraft use air inlet ducts mounted on the sides of the _________.

Answer 46

fuselage

Question 47

A typical ________ air inlet consists of a fixed geometry duct with a diameter that progressively increases from front to back.

Answer 47

subsonic

Question 48

__________ turbine engine inlets use a divergent profile to diffuse incoming ai r. At cruise airspeeds, the divergent shape causes air velocity to decrease and static air pressure to increase.

Answer 48

Subsonic

Question 49

On ____________ aircraft, a typical air inlet duct has either a fixed or variable geometry with a diameter that progressively decreases, then increases from front to back.

Answer 49

supersonic

Question 50

This convergent-divergent shape is used to slow the incoming airflow to subsonic speed before it reaches the compressor.

Answer 50

Supersonic Inlets

Question 51

Many ____________________ employ a movable plug or throat that changes duct geometry according to flight conditions.

Answer 51

supersonic inlet ducts

Question 52

__________________ have a convergent profile that is designed for obtaining high aerodynamic efficiency when stationary or in slow flight.

Answer 52

Bellmouth inlet ducts

Question 53

______________________ are typically used on helicopters, some slow-moving aircraft, and on engines being run in ground test stands.

Answer 53

Bellmouth inlet ducts

Question 54

Prevention of __________________ is a top priority among turbine engine operators and manufacturers.

Answer 54

foreign object damage (FOD)

Question 55

Several makes of helicopters and turboprop aircraft use ___________ to help prevent foreign object damage.

Answer 55

inlet screens

Question 56

A convergent duct at subsonic speed?

Answer 56

P ↓ V ↑

Question 57

A divergent duct at subsonic speed?

Answer 57

P ↑ V ↓

Question 58

A convergent duct at supersonic speed?

Answer 58

P ↑ V ↓

Question 59

A divergent duct at supersonic speed?

Answer 59

P ↓ V ↑

Question 60

_______________ ducts are undivided and supply air to one engine only.

Answer 60

Single entry

Question 61

__________ ducts can be two separated inlets that supply one engine or one intake internally divided to feed two engines

Answer 61

Divided entry

Question 62

An engine running at full power on the ground creates a negative pressure (suction) in the intake.

Answer 62

RAM RECOVERY

Question 63

A gas turbine engine takes in a quantity of air, adds energy to it, and then discharges the air to produce thrust.

Answer 63

Compressor Section

Question 64

The component forcing air into an engine is the _____________

Answer 64

compressor

Question 65

Task is to compress the air and deliver it with correct volume and velocity to the... combustion section.

Answer 65

compressors

Question 66

Driven by the turbine/s, compressors convert mechanical energy into kinetic energy (velocity), potential energy (pressure) and heat.

Answer 66

compressor

Question 67

Three different types of compressors

Answer 67

Centrifugal Axial Centri-axial

Question 68

The ______________ uses a rotating impeller, a stationary diffuser section and a manifold

Answer 68

centrifugal compressor

Question 69

____________________ achieve the same result as centrifugal compressors but do so while maintaining airflow in an axial direction through numerous stages.

Answer 69

Axial compressors

Question 70

Axial compressor stages consist of ________ and _____________

Answer 70

rotors and stators.

Question 71

A _____ is a rotating disc with blades attached around the circumference.

Answer 71

Rotor

Question 72

A _____ is a non-rotating set of blades fixed into a shroud assembly.

Answer 72

Stator

Question 73

The ________________________ uses a number of axial stages coupled to a final centrifugal stage.

Answer 73

centri-axial compressor

Question 74

has better overall compression ratio than a centrifugal compressor but is less efficient than a purely axial compressor.

Answer 74

Centri-Axial Compressor

Question 75

The ___________ converts kinetic energy from the gas flow into mechanical energy.

Answer 75

turbine section