I, Give the FBD for OA and whole system. A В M

Please solve with full explain and analyze max in 2 hours thank u Describe what is done in the combustion process in the combustion chamber of a gas turbine to overcome the problem of a very low laminar flame speed compared to aircraft speed and a limited flame limit range?

I am having a hard time understanding C-E on this problem. For C, I know that Th>Ti>Tc. Does that mean that since ec= 1-Tc/Th and Tc is the lowest temp of the system, that it is indeed more efficient with both engines?  The other ones, I just don't know where to start.  Any help or explantions would be appreciated!

An air compressor in Albuquerque with an 8-gallon tank is initially at atmospheric pressure (12.2psia, zero gauge pressure) and 60°F. The compressor is turned on and the tank gauge pressure iselevated to 120 psig. At the end of the pumping interval the air in the tank is at 120°F.a) How much air (lb mass) was added to the tank?b) What will the gauge pressure be in the tank after it cools back down to 60°F.