Exhausts

Question 1

At what speed do the gases leave the turbine

Answer 1

High speeds

Question 2

What is the purpose of the cone

Answer 2

Protect the rear face of the turbine disc from Overheating

Acta as a straightener vane

Question 3

What shape are helicopter exhaust systems

Answer 3

Divergent

Question 4

What is used to measure the average temperature in the jet pipe

Answer 4

Thermocouples - indication of turbine entry temperature

Question 5

Turbine entry has several names

Answer 5

Jet pipe temp
Turbine entry temp
Exhaust gas temp
Turbine gas temp
Turbine inlet temp

Question 6

Where does peak temp occur in the turbine entry temp

Answer 6

Starting

Question 7

Turbo prop and turbo shaft engines are how much degrees lower

Answer 7

90 - 100 degrees

Question 8

What materials are used in exhaust systems

Answer 8

Nimonic alloys

Question 9

What material is used in outer Casing and shrouds

Answer 9

Mild steel or alloys

Question 10

Insulation types in exhaust systems

Answer 10

Insulating blanket
Or
Air is used

Question 11

What are the key properties in a insulating blanket

Answer 11

Inner layer - of fibrous insulating materials
Outer - skin thin stainless steel and is DIMPLED to increase strength

Question 12

Maintenance on exhaust systems what do you check for

Answer 12

Cracking
Corrosion
Security of attachment