downwind,
1. What is de-icing paste exactly?
A paste (typically applied to propellers) whose physical characteristics prevent or restrict ice build-up. After long exposure to ice, the de-icing paste will be lost, really only short-medium term protection.
2. how are refuelling valves operated?
Usually mechanically or electricaly to open the valve/s to allow fuel to be pumped into the tanks. Additionally, when the refuelling hose nozzle is inserted, it physically unseats the main refuelling valve.
3. when air is pressurised what happens to % of oxygen
It remains the same.
4. rotation of main landing gear bogie relative to shock strut is prevented by?
Torque links
5. when fitting a new tyre to an aircraft, does creep occur?
Yes, but it wasn't always that way. Earlier (and some current generation) aircraft had a painted mark on the rim and the tyre/tire to check that creep had not taken place.
6. how is it possible to completely drain trapped oil and water in a pnuematic system?
By purging the system with high pressure clean dry air. If unavailable, the only way is to virtually dis-assemble the main components and clean them individually (I had to do it in the field once)
7. what happens if there is a leak in the bellows of a pnuematic pressure regulator valve?
Pneumatic pressure control is lost, usually leading to over-pressure in the pneumatic system up to relief valve pressure.
8. rubber matts are rated at (ie turboprop leading edge)?
Up to the Vne for the aircraft (I think that was the intent of your question)
9. how long will emergency torch operate for?
Regulations require a minimum of 15 minutes duration, but individual types vary and often exceed this.
10. pnuematic return line is situated between the component and the xxx??
It is dumped overboard (air is renewable, hydraulic fluid is not, which is why it is returned to the reservoir). Strictly speaking, pneumatic systems don't have a return line.
11. air trapped in hydraulic system, what to do?
Bleed the system (similar to bleeding brakes on a car).
Did I pass the exam?
Regards,
Old Smokey