Engineering, 22.08.2019 02:10 dtrammel91
Aplant processes very long tungsten beams with a cross-section of 50-cm by 50-cm in a furnace with air temperature of 900 celsius degree and a convective heat transfer coefficient of 300 w/m^2k. the initial temperature of the beam is 27 celsius degree, and the required process temperature is 650 celsius degree. assume the tungsten properties are evaluated at the average temperature(between initial and process temperatures). the beams are suddenly exposed to furnace conditions. ignore radiation. draw a schematic and label all relevant parameters determine: a)the tungsten thermal properties(thermal conductivity, specific heat, and thermal diffusivity at the average temperature) b)the biot number c)what locations on the beam will first reach the required temperature? d)how much time is needed (in s) to reach the required temperature at the locations found in c) –that first reach required temperature? e)what will be the answer for d) is one assumes lumped heat capacity model?
Answers: 3
Engineering, 04.07.2019 18:10
Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.
Answers: 2
Engineering, 04.07.2019 18:10
Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2
Answers: 3
Engineering, 04.07.2019 18:10
Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.
Answers: 2
Engineering, 04.07.2019 18:10
Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan
Answers: 3
Aplant processes very long tungsten beams with a cross-section of 50-cm by 50-cm in a furnace with a...
Mathematics, 02.09.2020 06:01
Mathematics, 02.09.2020 06:01
Mathematics, 02.09.2020 06:01
Mathematics, 02.09.2020 06:01
History, 02.09.2020 06:01
Mathematics, 02.09.2020 06:01
Computers and Technology, 02.09.2020 06:01
History, 02.09.2020 06:01
Arts, 02.09.2020 06:01
Mathematics, 02.09.2020 06:01
Biology, 02.09.2020 06:01