Aheat engine operates between a hot reservoir at 2000°c and the atmosphere (cold reservoir) at 25°c. it produces 50 mw of power while rejecting 40 mw of waste heat. determine the maximum possible thermal efficiency of the engine in percent.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

The higher the astm grain size number, the finer the gran is. a)-true b)-false