Originally Posted by
gbruyn
You are on the XYZ 270 radial at 30 DME. You are cleared to fly the 30 DME arc to the 300 radial, and hold. You are flying at .6 Mach and it is 1800z. At what time will you arrive at the holding fix?
a) 1805z
b) 1810z
c) 1815z
d) 1820z
What causes the loud noise of a jet engine?
a. High speed of compressors
b. Fast moving air being ejected (Guessing it's this one but can't find source)
c. The hot gases mixing with the cooler atmosphere
d. Something Else
One thing I've always wondered about the first one… What's the rule of thumb on the Mach vs. GS? Mach depends on temperature, so wouldn't you need to know the either the SAT, or the altitude (assuming ISA lapse rate)?
On the second one, wouldn't it depend upon where you're standing? Turbojet v. turbofan? If you're at the front of the engine, wouldn't you hear the compressors mostly. The sound is pretty directional as you move around a running engine.