Weir, upstep and jump
Water with depth y1 flows over a broad-crested weir with height P (where the water depth above the BCW is y2) in a horizontal rectangular channel. Directly downstream of the weir, the channel bottom rises by an amount d above the original channel bottom (d > P) and the water depth becomes y3 and the Froude number F3=2. Further downstream, a hydraulic jump occurs where the water depth becomes y4. If y1 is twice y2, find:
a) Froude number upstream of the weir F1
b) y3/y1
c) d/y2
d) y4/y1
e) P/y1

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.