. A cylinder with a volumetric displacement of 1477 cm3 is used in a piston aero engine burning iso-octane (C8H18). The density of iso-octane is 720 kg/m3 and air density is 1.225 kg/m3 . Determine (1) the mass of fuel and (2) the mass of air that must fill a cylinder during the injection stroke to achieve combustion with an equivalence ratio of 1.12.

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?