Turbine Engine Physics And Dynamics

Front 1

What happens to air flow in a turbine engine that results in thrust

Back 1

Expansion

Front 2

How is a turbojet producing engine rated

Back 2

Pounds of static thrust

Front 3

How is a turbo shaft producing engine rated

Back 3

Shaft horsepower

Front 4

What are the three states of matter

Back 4

Solid liquid gas

Front 5

Which of the three states of matter has his shape determined by the container it is in

Back 5

Gas

Front 6

What is the pressure and velocity relationship of a subsonic air flow through a convergent duct

Back 6

Velocity up pressure down

Front 7

What cools are turbine

Back 7

Secondary air

Front 8

What is the percentage of the secondary air used

Back 8

75%

Front 9

What three variables affect the air density going into a turbine engine

Back 9

Temperature speed altitude

Front 10

Why do fighter aircraft not use high bypass turbofan

Back 10

because of the smaller frontal area

Front 11

An influence that can cause a change in speed direction or shape is called what

Back 11

Force

Front 12

According to the pilot, which side of the engine is 9 o clock

Back 12

Left side

Front 13

What is Newton's third law

Back 13

For every action, there is an equal and opposite reaction

Front 14

What is another name for the Brayton thermodynamic cycle

Back 14

Constant pressure cycle

Front 15

What is Charles law

Back 15

that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature.

Front 16

Which of the turbine engines has the worst thrust specific fuel consumption (tsfc)

Back 16

Turbo jet

Front 17

What is the purpose of the turbine section

Back 17

To drive the compressor and accessories

Front 18

The most thrust is produced in a turbine engine at what point in its operation

Back 18

Most thrust produce at low or no Inlet are Velocity and higher power

Front 19

What is boundary layer air

Back 19

Layer of air close to the surface of the aircraft or Inlet

Front 20

What state did the Wright brothers first achieve flight

Back 20

North Carolina

Front 21

What state was the Wright brothers from

Back 21

Ohio

Front 22

What percentage of thrust in a high bypass turbofan engine is produced by the fan section

Back 22

50% to above 90%

Front 23

What is the primary advantage of a turbofan engine over a turbojet

Back 23

Fuel efficiency

Front 24

What type of compressor uses the design characteristics of both major types

Back 24

Axial centrifugal

Front 25

What is the purpose of secondary AIR

Back 25

Too cool and control the flame

Front 26

What percent of the energy created by the combustion section is used to keep a turbojet operating

Back 26

75%

Front 27

Why a turbofan so efficient

Back 27

Able to move a mass amount of air without a proportional increase in fuel flow

Front 28

What is Newton's second law

Back 28

that the acceleration of an object is directly proportional to the net force acting upon the object and inversely proportional to the mass of the object.

Front 29

What terms describe a rate of velocity change

Back 29

Acceleration

Front 30

What are the two forms of energy

Back 30

Potential energy / pressure

kinetic energy / velocity

Front 31

How is force obtained

Back 31

Force equals mass time acceleration

Front 32

What is the velocity and pressure relationship of a subsonic flow through a Divergent duct

Back 32

Velocity down pressure up

Front 33

What is the velocity and pressure relationship of a supersonic flow through a convergent duct

Back 33

Velocity down pressure up

Front 34

What type of gas turbine engine obtains all its thrust by highly accelerating a relatively small air flow

Back 34

Turbo jet

Front 35

In theory, which type of gas turbine engine will have the lowest exhaust exit velocity

Back 35

Turboshaft

Front 36

What is currently the most efficient engine to use on a large Transportation aircraft

Back 36

High bypass ratio turbofan

Front 37

At what engine speed will small increase in RPM cause rapid thrust increase

Back 37

Higher RPMs

Front 38

What is a standard day sea level pressure

Back 38

29.9 to inches of mercury (HG)

Front 39

What are the three main sections included in the hot section

Back 39

Combustion turbine exhaust

Front 40

What are the two primary types of compressors

Back 40

Axial centrifugal

Front 41

What are the two types of torque producing engines

Back 41

Turboprop and turboshaft

Front 42

Energy in motion is called what

Back 42

Kinetic energy

Front 43

A decrease in altitude will have what effect on the thrust of a turbine engine

Back 43

Increased thrust

Front 44

The Brayton cycle has four thermodynamic processes what are they in order of occurrence

Back 44

Compression, addition of heat, expansion, removal of heat

Front 45

Entropy involves which of the thermodynamic laws

Back 45

Second law of thermodynamics

Front 46

What does tsfc represent and what type of turbine engine would use it

Back 46

Thrust specific fuel consumption and thrust producing turbine engines

Front 47

Compare the acceleration of a gas turbine engine to a reciprocating engine what is the difference

Back 47

Turbine to not accelerate while compared to reciprocating engines

Front 48

What two methods are generally used to classify gas turbine engines

Back 48

Thrust producing and torque producing

Front 49

What effect does Humidity have on the operation of a turbine engine

Back 49

Little to no effect

Front 50

Which part of a turbine engine produces a rewarding force of the engine hindering for movement of the aircraft

Back 50

The turbine

Front 51

Ram drags involves what kind of frustrating

Back 51

Net thrust

Front 52

The kinetic energy of SuperSonic air goes through a Divergent nozzle does what

Back 52

Increase

Front 53

What type of turbine engine will produce increase mass air flow without substantially increase fuel consumption

Back 53

Turbofan