A built-up roof (BUR) membrane consists of several plies of felt, where each successive felt is laid over a mopping of asphalt. The last ply in a BUR is not the same as the underlying plies. What is the difference and why?
What will be an ideal response?
The last ply in a BUR consists of one of the following: (i) a flood coat of asphalt covered with a surfacing material, such as crushed stone, slag, or (river-worn) gravel, or (ii) a mineral granule -covered cap sheet. Crushed stone and granule-covered cap sheet protect the asphalt from sun's ultraviolet radiation and increase the roof's fire resistance and hail-impact resistance.
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A distillation unit is to be used to generate pure water vapor. 2.0 kg/s of liquid water at 25oC enters the system, and 0.2 kg/s of saturated water vapor leaves through one port and 1.8 kg/s of saturated liquid leaves through a second port (along with impurities in the water which can be neglected in the analysis). The pressure throughout the whole system is 100 kPa. There is no work done in the process, and all energy is added through heat transfer. (a) Determine the rate of heat transfer needed to produce this flow of saturated water vapor. (b) Using your separation chamber model, plot the heat transfer rates needed to produce saturated water vapor flow rates between 0.1 kg/s and 1.0 kg/s (along with corresponding changes to the saturated liquid water exit flow rates).
State 1: Inlet stream; State 2: Saturated vapor exit stream; State 3: Saturated liquid exit. Given: P1 = P2 = P3 = 100 kPa; T1 = 20oC; x2 = 1.0; x3 = 0.0; m?1=2.0kgs; m?2=0.2kgs; m?3=1.80kgs Assume: W?=0 (given). Given no other information regarding the mixing chamber, make the following common assumptions: ?KE=?PE=0. We are told there is heat transfer. Also, assume the mixing chamber is a single-inlet, multiple-outlet, steady-state, steady-flow device. What will be an ideal response?
If it takes 33 pounds of force to move a 100 pound block of friction material across a surface it is said to:
a. need 33 psi applied to it to stop it b. have a surface coefficient of friction of 0.33 c. need more force to keep it going than to stop it d. have a surface coefficient of friction of 3.3
What is created in a receiver with reception of electromagnetic interference (EMI)?
A. Undesired amplitude modulation B. Variable sensitivity C. Diode resistance D. Distorted, unintelligible output