Afour cylinder, four-stroke spark ignition engine with a total displacement of 2.4 l runs at 2500 rpm. the processes within each cylinder are modeled as an air-standard otto cycle. at the beginning of the compression process (state 1), the air is at 85 kpa, 290 k. the compression ratio is 9 and the maximum temperature in the cycle is 2000 k. determine:
a. net work output per cylinder (per cycle) kj]
b. energy added by the combustion process per cylinder [kj]
c. thermal efficiency
d. mean effective pressure
e. power output of engine [kw, horsepower

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet