Mixed Questions 🧠

Question 1

While starting a turbine engine, the engine rpm stabilises at less than the idle rpm and the turbine gas temperature initially rises normally.

What sort of start does this indicate?

Answer 1

Hung start

Question 2

Which is more efficient?
Piston or Turbine?

Answer 2

Turbine

Question 3

A convergent divergent exhaust nozzle can be found on

Answer 3

Supersonic aircraft

Question 4

During the start sequence of a turbine engine, if there was a restriction of airflow entering the engine, what sort of abnormal start would be most likely?

Answer 4

Hot start

Question 5

The thrust produced by a turbine engine can be calculated by

Answer 5

F=ma
The mass of the air accelerated through the engine multiplied by change in the velocity of that air

Question 6

Compressor bleed air can be used for sealing the

Answer 6

Bearing chambers

Question 7

Some components of a turbine engine are cooled by

Answer 7

Bleed air from the compressor section

Question 8

Clamshell reverse thrusters are mounted in what airstream and are actuated by

Answer 8

Hot airstream and hydraulic or pneumatically actuated

Question 9

The first part of the exhaust cone assembly is what shape and why

Answer 9

It is divergent shape because it assists to reduce skin friction drag loss

Question 10

The turbine engine component that can handle a larger airflow mass for a given engine size is

Answer 10

Annular

Question 11

As air passes through the turbine section it

Answer 11

Expands and cools

Question 12

The component of a centrifugal compressor that straightens and reduces the velocity of the airflow leaving the impeller is the

Answer 12

Diffuser