Turbine Engines

Question 1

Pulsejet Air for Compressor

Answer 1

Check Valves

Question 2

Purpose of Turbine in Gas Turbine Engine?

Answer 2

Turn Compressor

Question 3

Main Advantage of Turbojet?

Answer 3

More Power + Fuel Efficient

Question 4

Another name for Bypass Air?

Answer 4

Secondary Airflow

Question 5

Most common gas turbine on corporate jets?

Answer 5

Medium Bypass

Question 6

Another name for Free Turbine?

Answer 6

Power Turbine

Question 7

Application of Turboshaft Engine?

Answer 7

APU/ Helicopter

Question 8

If there are 2 compressors?

Answer 8

Double Spool

Question 9

Relationship between Air Density and Thrust

Answer 9

Air Density is Directly Proportional to Thrust

Question 10

Propulsive Efficiency?

Answer 10

Measure of effectiveness with which an engine converts kinetic energy into useful work

Question 11

Gross Thrust

Answer 11

Total thrust produced without deduction of drag caused by momentum of incoming air

Question 12

Newtons 1st Law?

Answer 12

Law of inertia

Question 13

Newtons 2nd Law

Answer 13

Law of acceleration

Question 14

Newtons 3rd Law

Answer 14

Every action has a equal and opposite reaction

Question 15

Modular Engine Design?

Answer 15

Lower Maintenance Cost

Question 16

Inlet duct design used on the Concorde

Answer 16

CD duct

Question 17

Why are Vortex generators used on inlets

Answer 17

Smooths the air

Question 18

Areas heated using Anti-Ice

Answer 18

Cowl
Inlet Guide Vanes
Nose Cone

Question 19

Primary purpose of compressor?

Answer 19

Increase static pressure and Decrease Velocity

Question 20

(single stage) Centrifugal Compressor Ratio?

Answer 20

10:1

Question 21

Purpose of Diffusor

Answer 21

Increase static pressure and Decrease Velocity prior to combustion

Question 22

Stage of axial flow compressors?

Answer 22

Rotors then Stators

Question 23

Function of compressor stator

Answer 23

Increase pressure and direct airflow into the next rotor

Question 24

Causes of compressor stall?

Answer 24

Turbulence
Quick Acceleration
Quick De-cceleration

Question 25

Compressor wash?

Answer 25

fluid and grit blast

Question 26

What did Frank Whittle Invent?

Answer 26

First Turbojet engine with a centrifugal impeller compressor

Question 27

What compressor type is a turbojet aircraft engine?

Answer 27

Centrifugal

Question 28

Another Name for Core Airflow?

Answer 28

Primary airflow

Question 29

What does pt7 stand for?

Answer 29

Total air pressure at station 7 ( Dynamic )

Question 30

What does a gearbox reduction do?

Answer 30

Keeps the tips subsonic For prop efficiency Powers the prop

Question 31

What does a free turbine do?

Answer 31

Gas gen. section and Power section separate Reduce noise + blade erosion Lower vibration Power gear box

Question 32

Purpose of the Bellmouth inlet?

Answer 32

Helicopters and testing engines. Highest aerodynamic efficiency.

Question 33

3 types of Inlet designs?

Answer 33

Subsonic(private + commercial) Supersonic(concord) Bellmouth(helicopters + testing)

Question 34

Highest Potential Energy?

Answer 34

Diffuser