Combustion gases enter a gas turbine at a velocity of 15m/s, a temperature of 800K, a pressure of 500kPa and a volume flow rate of 2m3 /s and exit the turbine at a pressure of 100kPa, a temperature of 350K, and a velocity of 2m/s. Heat is transferred from the combustion gases to the ambient at the rate of 690kW. Compute the mass flow rate of combustion gases going through the turbine and the volume flow rate of combustion gases flowing out of the turbine. Also, compute the power produced by the turbine and the rate of entropy generation in the process. Also compute the rate of irreversibility in this process assuming an ambient temperature of To=25o C. Assume the combustion gases to have the properties of air and assume that they behave as an ideal gas with constant specific heats [1.004kJ/(kg K) for Cp, o and 0.717kJ/(kg K) for Cv, o].

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?