4-22 bald eagle creek flows into bald eagle reservoir, which acts as a completely mixed reactor. bald eagle creek has a flow rate of 0.20 m3/s and a dissolved oxygen concentration of 4.75 mg/l. bald eagle reservoir has a volume of 104 m3. oxygen is removed in the lake through biological processes, and the reaction rate, kd, is 0.06 day–1. evaporation removes water from the surface of the lake at a rate of 0.002 m3/s. determine the effluent flow rate and dis- solved oxygen concentration for this completely mixed lake.

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference