Agasoline engine operating on an ideal otto cycle has a compression ratio of 11. air enters the engine at 100 kpa, 37 c. the maximum temperature during the cycle is 1700 k·treat the working fluid as air and use variable specific heats , determine: (a) the amount of heat transfer per unit mass of the working fluid during the heat addition process (b) the thermal efficiency of the engine, (c) the mean effective pressure for this cycle. (d) show this cycle on p-v and t-s diagrams.

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2