Engineering, 02.08.2019 19:20 lovly8914
A4-m-high and 6-m-wide wall consists of a long 18-cm×30-cm cross section of horizontal bricks (k=0.72w/m°c) separated by 3-cm-thick plaster layers (k=0.22w/m°c). there are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid foam (k=0.026w/m°c) on the inner side of the wall. the indoor and the outdoor temperatures are 22°c and -4°c, and the convection heat transfer coefficients on the inner and the outer sides are h1=10w/m^2°c and h2=20w/m^2°c, respectively. assuming onedimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall.
Answers: 3
Engineering, 04.07.2019 18:10
Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.
Answers: 3
Engineering, 04.07.2019 18:10
The higher the astm grain size number, the finer the gran is. a)-true b)-false
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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
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Engineering, 04.07.2019 18:20
Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k
Answers: 2
A4-m-high and 6-m-wide wall consists of a long 18-cm×30-cm cross section of horizontal bricks (k=0.7...
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