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A four-cylinder, four-stroke spark-ignition engine operates on the ideal Otto cycle with a compression ratio of 11 and a total displacement volume of 1.8 liter. The air is at 90 kPa and 50°C at the beginning of the compression process. The heat input is 1.5 kJ per cycle per cylinder. Accounting for the variation of specific heats of air with temperature, determine
(a) the maximum temperature and pressure that occur during the cycle,
(b) the net work per cycle per cyclinder and the thermal efficiency of the cycle,
(c) the mean effective pressure, and
(d) the power output for an engine speed of 3000 rpm
Calculate the heat supplied and change of entropy and show the process on a T-s diagram, indicating the area which represents the heat flow.
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Using the thermodata computed from the matlab functions to compute the mixture-averaged mass specific Gibbs free energy of the final mixture, as a function of the progress variable (normalized as: 0 for no dissociation, and 1 for complete dissociatio..
the vertical component of the landing speed of a parachute is to be less than 20 fts. the total weight of the jumper
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A Brayton gas turbine cycle has two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300K and each stage of the turbine at 1..
Steam at 550 lbf/in.2, 70 oF enters a turbine operating at steady state and exits at 1 lbf/in.^2. The turbine produces 500 hp. For the turbine, heat transfer is negligible as are kinetic and potential energy effects. Determine the quality of the stea..
Twenty ceramic specimens were tested to fracture. The measured fracture loads in N were 279, 195, 246, 302, 255, 262, 164, 242, 197, 224, 255, 269, 213, 172, 179, 143, 206, 233, 246, 295. A. Determine the Weibull modulus, m.
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