Turbine Engines

Question 1

What determines the amount of airflow through a turbine engine

Answer 1

forward speed , compressor speed,and air density

Question 2

Name the two types of compressors

Answer 2

Axial and centrifugal

Question 3

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

Answer 3

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

Question 4

What is shaft horsepower

Answer 4

torque developed by a turboprop or turbo shaft engine

Question 5

Name the main components of a typical APU

Answer 5

A small power turbine and electrical generator

Question 6

What prevents the combustion chamber from burning

Answer 6

Cooled air inside of the liner

Question 7

How is an APU generally started

Answer 7

With its own electrical starter and battery power

Question 8

Where does the APU get it’s fuel supply

Answer 8

From one of the aircrafts main fuel tanks

Question 9

When is the greatest demand placed on an APU

Answer 9

When supplying bleed air

Question 10

Name the major components in a gas turbine engine

Answer 10

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

Question 11

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

Answer 11

Dovetail, and Fir tree

Question 12

What function do axial flow turbine nozzles perform

Answer 12

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

Question 13

How are thermal stress relieved on a turbine disc

Answer 13

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

Question 14

What are carbon seals used for in turbine engines

Answer 14

Used as oil seals for the rotor shaft bearings

Question 15

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

Answer 15

Load control valve

Question 16

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

Answer 16

Fuel pressure

Question 17

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

Answer 17

Any rubbing sound or other unusual noises

Question 18

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

Answer 18

High EGT

Question 19

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

Answer 19

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

Question 20

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

Answer 20

Layout dye, felt tip marker, and chalk

Question 21

How does relative humidity affect turbine engines

Answer 21

Negligible effect

Question 22

What criteria determines replacement of life limited turbine engine components

Answer 22

Cycles, hours, and calendar time

Question 23

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

Answer 23

To maintain balance of the turbine wheel

Question 24

How are gas turbine engine tachometers calibrated

Answer 24

By percent R.P.M

Question 25

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

Answer 25

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

Question 26

What are two types of thrust reverse

Answer 26

Mechanical and aerodynamic blockage

Question 27

What is free turbine

Answer 27

A turbine wheel that drives a propeller

Question 28

What is the main purpose or thrust reverses

Answer 28

For slowing the aircraft down to effective braking speed

Question 29

What is the major different between turboprop and turbojet engines

Answer 29

Turboprop has more turbine stages and also drives a propeller

Question 30

What is meant by a hot-section inspection

Answer 30

Hot sections includes combustors, turbine, and exhaust section

Question 31

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

Answer 31

For flam propagation during start