Engineering, 24.10.2020 06:50 1129682
A two-stage compressor is used to compress 15 moles/s of carbon dioxide gas at 300 K and 100 kPa. The first stage compresses the gas to 400 kPa and the second stage from 400 kPa to 2000 kPa. Assume that first compressor is well insulated and has an isentropic efficiency of 80% but the second compressor is well insulated and well lubricated. There is no cooling between the compressors. Calculate the power required (to nearest kW) for each stage compressor and the entropy generated (to nearest W/K) by each compressor. Assume that carbon dioxide behaves as an ideal gas and its cp* (J/mol-K)= 25+ 0.2 T
Answers: 3
Engineering, 03.07.2019 14:10
If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.
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Engineering, 03.07.2019 15:10
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
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Engineering, 04.07.2019 18:10
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.
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Engineering, 04.07.2019 18:10
Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation
Answers: 1
A two-stage compressor is used to compress 15 moles/s of carbon dioxide gas at 300 K and 100 kPa. Th...
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