Week 18 (Q&A)

Question 1

What is a Divergent duct’s shape & what does it do?

Answer 1

Velocity Decreases, Pressure Increases

Question 2

IN A TURBINE ENG, WHAT IS A COMMON TERM APPLIED TO A DIVERGENT DUCT?

Answer 2

Diffuser

Question 3

What is a Convergent duct’s shape & what does it do?

Answer 3

Increase Velocity, Decrease Pressure

Question 4

Which component on a turbine eng is typically a Convergent duct?

Answer 4

Exhaust Nozzle

Question 5

Define Bernoulli’s Principle

Answer 5

‘The sum of the static and dynamic pressures will always be equal’ (Increase Velocity, Decrease Pressure)

Question 6

4 events to support combustion occur constantly & simultaneously and referred to as a Constant Pressure Cycle.

Answer 6

Brayton Cycle

Question 7

is defined as a single rotating unit with a compressor and turbine attached at opposite ends of a shaft.

Answer 7

Spool/Rotor

Question 8

Rotors are typically referred to as

Answer 8

N1, N2, N3

Question 9

What is Engine Pressure Ratio (E.P.R.) ?

Answer 9

measures engine thrust output by comparing the pressure at the front to the pressure back of the engine.

Question 10

REFERS TO THE LP (LOW PRESS) ROTOR.

Answer 10

N1

Question 11

REFERS TO THE HP ROTOR (HI PRESS) IN A 2-SPOOL ENGINE.

Answer 11

N2

Question 12

5 primary areas within a turbine engine, front to back.

Answer 12

INTAKE-COMPRESSOR-COMBUSTION-TURBINE-EXHAUST

Question 13

A CONFIGURATION WHERE A PROPELLOR IS DRIVEN BY A TURBINE ENGINE.

Answer 13

Turboprop Engine

Question 14

It increases the static pressure from the inlet duct and directs it to the combustion chamber at the correct pressure, velocity and temp (Rotor and Stator)

Answer 14

Axial Compressor Stage

Question 15

converts the kinetic and heat energy of the combustion gases into mechanical energy to rotate the Turbine to drive the fan/propeller/compressors/accessories. (Stator and Rotor)

Answer 15

Axial Turbine Stage

Question 16

Where is the turbine section located?

Answer 16

downstream of the combustion section.

Question 17

IS A SOURCE of AIR PRESSURE (Pneumatic press) FROM THE COMPRESSOR THAT IS USED FOR VARIOUS FUNCTIONS.

Answer 17

Bleed Air

Question 18

TYPICAL USES OF BLEED AIR

Answer 18

CABIN PRESS

STARTING

ANTI-ICING SYSTEMS

Question 19

What is FADEC?

Answer 19

FULL AUTHORITY DIGITAL ENGINE CONTROL

Question 20

What is AGB?

Answer 20

ACCESSORY GEAR BOX

Question 21

What is EGT?

Answer 21

Exhaust Gas Temperature

Question 22

What is IGV?

Answer 22

Inlet Guide Vanes

Question 23

occurs when the blade angle of attack exceeds the critical angle of attack, caused by an imbalance between the inlet velocity and rpm

Answer 23

Compressor stall