Right chaps,
This is it........Ive worked it out!!
What AIR:FUEL Mixture will allow the max EGT??
A..Near Idle cut off
B.. 1:9
C..1:1/15:1
D..Cruise settin
Now if you read the question they have asked for Air to Fuel (as in exam) now this means that the Max EGT will be gained from 15:1 but that is not an option......... However,If you look at 1:1/15:1........
Complicated explanantion......
If you have 1 part of air but only a 'one fifteenth' of fuel.......then by the time you manage to get all the 'fifteenths of fuel' (ie, make a whole one) then you will also have accumalated 15 parts of air at the same time.....therefore you have an air:Fuel mixture of 15:1!!!
Its not 1:9 cos that would be far too rich!! 1part of air to 9 parts fuel?? I dont think so!
Cruise will be leaned so i cant see that being the answer!
Anyway i went for C.......im pretty sure its right!!