It is desired to increase the output of a spark-ignition engine (with a compression ratio of 8:1 and an inlet pressure 1.0 atm) by either: (1) raising the compression ratio from 8 to 11, or (2) increasing the inlet pressure from 1.0 atm to 1.8 atm Assume g = 1.3 and . Using the constant volume cycle as a model for engine operation, which procedure will give: a) The highest pressure in the cycle? b) The highest efficiency? c) The highest i. m.e. p.?

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.