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Flashcards in Turbine Engines Deck (31)
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1
Q

What determines the amount of airflow through a turbine engine

A

forward speed , compressor speed,and air density

2
Q

Name the two types of compressors

A

Axial and centrifugal

3
Q

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

A

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

4
Q

What is shaft horsepower

A

torque developed by a turboprop or turbo shaft engine

5
Q

Name the main components of a typical APU

A

A small power turbine and electrical generator

6
Q

What prevents the combustion chamber from burning

A

Cooled air inside of the liner

7
Q

How is an APU generally started

A

With its own electrical starter and battery power

8
Q

Where does the APU get it’s fuel supply

A

From one of the aircrafts main fuel tanks

9
Q

When is the greatest demand placed on an APU

A

When supplying bleed air

10
Q

Name the major components in a gas turbine engine

A

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

11
Q

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

A

Dovetail, and Fir tree

12
Q

What function do axial flow turbine nozzles perform

A

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

13
Q

How are thermal stress relieved on a turbine disc

A

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

14
Q

What are carbon seals used for in turbine engines

A

Used as oil seals for the rotor shaft bearings

15
Q

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

A

Load control valve

16
Q

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

A

Fuel pressure

17
Q

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

A

Any rubbing sound or other unusual noises

18
Q

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

A

High EGT

19
Q

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

A

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

20
Q

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

A

Layout dye, felt tip marker, and chalk

21
Q

How does relative humidity affect turbine engines

A

Negligible effect

22
Q

What criteria determines replacement of life limited turbine engine components

A

Cycles, hours, and calendar time

23
Q

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

A

To maintain balance of the turbine wheel

24
Q

How are gas turbine engine tachometers calibrated

A

By percent R.P.M

25
Q

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

A

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

26
Q

What are two types of thrust reverse

A

Mechanical and aerodynamic blockage

27
Q

What is free turbine

A

A turbine wheel that drives a propeller

28
Q

What is the main purpose or thrust reverses

A

For slowing the aircraft down to effective braking speed

29
Q

What is the major different between turboprop and turbojet engines

A

Turboprop has more turbine stages and also drives a propeller

30
Q

What is meant by a hot-section inspection

A

Hot sections includes combustors, turbine, and exhaust section

31
Q

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

A

For flam propagation during start