General knowledge Flashcards
When do igniters stop operating?
Once flame is established
What is the function of a gas turbine?
To convert heat energy into rotary motion for ship propulsion
Torsion is?
the twisting/turning/rotational force, along the axis of a shaft
In mechanical terms (component ‘a’ is bolted to component ‘b’ etc), where does the transmission system begin ?
At the power turbine
What lubricating oil is commonly used in RN gas turbines?
OX 22
Give 5 trips and safety devices that you would find on a gas turbine.
- Fire detector
- PTET (Power turbine entry temp)
- High PT torque
- Partial overspeed
- LP/HP governors
What is the largest ratio that can be sensibly achieved on single gear reduction?
15:1
How often are FL cut-ins carried out?
Every 24hrs
What is the purpose of water washing?
To remove fowling deposits such as dust & carbon, from the compressor blades
Name the components that are used to support the weight of the shaft, outside of the hull.
- Main A bracket
- Intermediate A bracket
