Test 2

Question 1

Axial- Flow Compressors- Roter Blades Material

Answer 1

Stainless steel or titanium

Question 2

What are the various designs to attach the blade root to the hub

Answer 2

bulb-type, Fir Tree and dovetail

Question 3

What movement does the Various designs prevent

Answer 3

Radial movement

Question 4

Blisk

Answer 4

Single assembly compressor blade

Question 5

Blade Tip clearance is helped by

Answer 5

abradable tipped blades, abradable lining and RACC (Rotor active clearance control)

Question 6

What are compressor stator vanes made of

Answer 6

Steel and nickel

Question 7

What is the Fan pressure Ratio low bypass

Answer 7

1.5:1

Question 8

What is the Fan pressure Ratio high bypass

Answer 8

1.7:1

Question 9

What are aspect ratio doesn’t newer fans use and what are they made of

Answer 9

Low aspect ratio made from hollow titanium or carbon-carbon

Question 10

Double Spool advantages over single

Answer 10

Higher compression pressure ratio, quicker acceleration and improved control of stall characteristics

Question 11

Triple spool advantages over double

Answer 11

Shorter engine length due to shorter HP shaft drive

Question 12

Divergent & Convergent

Answer 12

Divergent <

Convergant >

Question 13

What type of duct does a diffuser use

Answer 13

Divergent duct - seperating the hot side from the cold side

Question 14

Purpose of a diffuser

Answer 14

decrease the velocity and increase static pressure

Question 15

What is the purpose of a combustor

Answer 15

converts potential energy into kinetic energy

Question 16

Where is the energy used and how much energy is used

Answer 16

2/3 of the energy is used by the turbines while the remaining is used for thrust

Question 17

What is needed for an effective combustion chamber

Answer 17

way of adding fuel and air mixture in proper amounts
burn the mixture effectively
provide cooling for the turbine blade operation
distribute the hot gasses evenly

Question 18

Why is there a fuel drain?

Answer 18

prevents tailpipe fires, hot starts, prevents gum deposits

Question 19

How does the fuel drain open and close

Answer 19

the valve is spring loaded open and closed by combustion pressure

Question 20

louvers and coolingholes

Answer 20

direct air from the inside wall of the liner into the combustion chamber

Question 21

dilution holes

Answer 21

cooling air joins the hot air before entering the tubines

Question 22

Flameout causes

Answer 22

Excessively high or slow airflow rates 
Turbulent weather
high altitude
slow acceleration 
high speed maneuvers

Question 23

How are single burner combusts constructed

Answer 23

constructed of small holes (perforated) highly heat resistant - stainless steel

Question 24

How many cans does a multi-can compressor have

Answer 24

8 or 10, only 2 will have ignitors ONLY USED IN OLDER AIRCRAFT

Question 25

How does the ignitor spread to other cans

Answer 25

Cans are interconnected with flame propagation tubes,

Question 26

What does the Annular Combustor consist of

Answer 26

Outer liner and a inner liner with holes in it referred to as a basket

Question 27

Where is the basket placed

Answer 27

between the outer and inner combustor case

Question 28

what is the basket made of

Answer 28

heat resistant steel and alloys

Question 29

what are 2 designs of annular combusts

Answer 29

straight flow and reverse flow

Question 30

How is fuel mixed with a annular combustor

Answer 30

like a multi can, there are only 2 fuel ignitors

Question 31

Advantages of straight flow

Answer 31

increased thermal efficiency, lighter weight and smaller physical size

Question 32

What engines are reverse flow found on

Answer 32

turbo prop and helicopters

Question 33

Advantages of reverse flow

Answer 33

shorter engine light and lightweight

Question 34

Disadvantages

Answer 34

energy loss by the changes of airflow