Turbine Engines Flashcards Preview

Powerplant > Turbine Engines > Flashcards

Flashcards in Turbine Engines Deck (31):
1

What determines the amount of airflow through a turbine engine

forward speed , compressor speed,and air density

2

Name the two types of compressors

Axial and centrifugal

3

What are the different types of combustion chambers used in turbine engines

Can can-annular, annular, multiple can and reverse flow

4

What is shaft horsepower

torque developed by a turboprop or turbo shaft engine

5

Name the main components of a typical APU

A small power turbine and electrical generator

6

What prevents the combustion chamber from burning

Cooled air inside of the liner

7

How is an APU generally started

With its own electrical starter and battery power

8

Where does the APU get it's fuel supply

From one of the aircrafts main fuel tanks

9

When is the greatest demand placed on an APU

When supplying bleed air

10

Name the major components in a gas turbine engine

inlet, compressor, diffuser, combustion chamber, turbines, exhaust, gearbox and accessory

11

Name two different methods for attaching turbine engine rotor blades to the rotor disks

Dovetail, and Fir tree

12

What function do axial flow turbine nozzles perform

Directs mass airflow to drive the turbine rotor at a specific angle

13

How are thermal stress relieved on a turbine disc

By directing bleed air into the face of the disk, or by grooves being cut in the disk

14

What are carbon seals used for in turbine engines

Used as oil seals for the rotor shaft bearings

15

What is used to prevent a heavily loaded APU from exceeding its maximum EGT

Load control valve

16

What powers the variable inlet guide vanes used on some APUs to regulate compressor intake airflow

Fuel pressure

17

When a tubofan or turbojet engine is shut down, what should a mechanic listen for during coast down

Any rubbing sound or other unusual noises

18

How can you tell if the turbofan or turbojet engine is out of trim

High EGT

19

Name the different types of compressor blade damage that may be found during inspection

Dents, cracks, galling, pitting, scratching,and burns

20

What kind of markers can be used to mark the parts in hot and cold sections during repair

Layout dye, felt tip marker, and chalk

21

How does relative humidity affect turbine engines

Negligible effect

22

What criteria determines replacement of life limited turbine engine components

Cycles, hours, and calendar time

23

If turbine blades are removed from a turbine disc, why should they be re-installed in the same location

To maintain balance of the turbine wheel

24

How are gas turbine engine tachometers calibrated

By percent R.P.M

25

What's the function of a diffuser and where is it located in a turbine engine

Located between the compressor section and the burner cans and it changes high velocity discharge air to static pressure

26

What are two types of thrust reverse

Mechanical and aerodynamic blockage

27

What is free turbine

A turbine wheel that drives a propeller

28

What is the main purpose or thrust reverses

For slowing the aircraft down to effective braking speed

29

What is the major different between turboprop and turbojet engines

Turboprop has more turbine stages and also drives a propeller

30

What is meant by a hot-section inspection

Hot sections includes combustors, turbine, and exhaust section

31

What is the purpose of the interconnecting tubes attached between can type combustion chambers

For flam propagation during start