Final

Question 0

Where does the air pass thru in a Centrifugal Compressor?

Answer 0

Diffuser

Question 1

What is the function and shape of an Air Inlet (Intake) duct?

Answer 1

Divergent, to decrease velocity, increase Pressure and Temperature.

Question 2

What is the percentage of compression in both Impeller & Diffuser?

Answer 2

50% diffuser & 50% impeller

Question 3

In an axial flow compressor, the gradual air pressure rises in what ratio?

Answer 3

1.25 : 1 in Pressure

Question 4

What kind of passage way are form between Adjacent blades / Vanes of the same row in an Axial Compressor?

Answer 4

Divergent between Adjacent blades and the vanes

Question 5

Which is the length of blades from the LP and to the HP end in the Axial Flow Compressor ?

Answer 5

Longer at the LP end & Shorter at the HP end.

Question 6

What is the another name for the air passage in an Axial Flow Compressor?

Answer 6

Air Annulars

Question 7

In the Combustion Chamber, what is the apportion percentage of the airflow between the primary and the dilution zones?

Answer 7

20 % into the Combustion Chamber, the rest to cool the output energy in the Exhaust

Question 8

What are the three type of Combustion Chambers and their Variations details?

Answer 8

Multiple- Combustion, Turbo- Annular & Annular

Question 9

What is the function of the turbine blades?

Answer 9

To extract energy of the heat energy from the output of Combustion Chamber.

Question 10

What are the 3 types of turbine blades?

Answer 10

Impulsion, Reaction & Impulse-reaction.

Question 11

In the Combined Impluse-Reaction type blades, how is the workload distributed?

Answer 11

Evenly throughout the blade.

Question 12

In an Impulse-Reaction Turbine Blade, Which section is Impulse and Reaction?

Answer 12

Impulse @ Root end & Reaction @ Tip end.

Question 13

Where is the Convergent passage when the velocity changes takes place in Impulse and Reaction turbine blades?

Answer 13

Impulse @ Nozzle Guide Vanes (NGV),

Reaction @ Turbine

Question 14

Which are the 2 turbine blades used for high and low rotation speed?

Answer 14

Opened for Low speed, Shrouded for High Speed.

Question 15

What is the phenomenon called when a turbine blade suffers permanent elongation?

Answer 15

Creeping

Question 16

What is imposed on turbine blades to prevent permanent elongation?

Answer 16

Life-Limit before failure set in.

Question 17

How does the thrust reversal operate?

Answer 17

Direct the Thrust forward, Reverse the heat energy from the exhaust.

Question 18

What are the 3 methods of thrust reversal ops?

Answer 18

Clamshell, Hotstream & Translating Cowl/ Cold Stream System.

Question 19

What is the level of Viscosity?

Answer 19

Maintain film lubrication, not too slimy or hard.

Question 20

Ability to retain its viscosity characteristic?

Answer 20

High Viscosity Index.

Question 21

What is the purpose for Centrifugal Breather?

Answer 21

Return oil to tank, Vent air to atmosphere. Objective: to minimize oil loss.

Question 22

Thrust equation

Answer 22

Momentum = Mass x Velocity

Question 23

Charle’s Law?

Answer 23

Pressure and Temperature (absolute in K) change proportionately to each other.