Engineering, 19.03.2021 18:10 NijaNij
In the Otto cycle all the heat transfer qH occurs at constant volume. It is more realistic to assume that part of qH occurs after the piston has started its downward motion in the expansion stroke. Therefore, consider a cycle identical to the Otto cycle, except that the first two-thirds of the total qH occurs at constant volume and the last one-third occurs at constant pressure. Assume that the total qH is 2100 kJ/kg, that the state at the beginning of the compression process is 90 kPa, 20°C, and that the compression ratio is 9. Calculate the maximum pressure and temperature and the thermal efficiency of this cycle. Compare the results with those of a conventional Otto cycle having the same given variables.
Answers: 2
Engineering, 04.07.2019 18:10
The higher the astm grain size number, the finer the gran is. a)-true b)-false
Answers: 2
Engineering, 04.07.2019 18:10
A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.
Answers: 2
Engineering, 04.07.2019 19:10
The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object
Answers: 1
Engineering, 04.07.2019 19:10
Starting wih an energy balance on a rectangular volume element, derive the one- dimensional transient heat conduction equation for a plane wall with constant thermal conductivity and no heat generation.
Answers: 1
In the Otto cycle all the heat transfer qH occurs at constant volume. It is more realistic to assume...
Mathematics, 01.05.2021 01:00
Mathematics, 01.05.2021 01:00
History, 01.05.2021 01:00
Arts, 01.05.2021 01:00
Computers and Technology, 01.05.2021 01:00
Advanced Placement (AP), 01.05.2021 01:00
Mathematics, 01.05.2021 01:00
Mathematics, 01.05.2021 01:00
English, 01.05.2021 01:00
Mathematics, 01.05.2021 01:00
Mathematics, 01.05.2021 01:00
Mathematics, 01.05.2021 01:00