The chromatogram shows the separation of components in an over‑the‑counter pain reliever. a plot has peaks labeled 1 through 4 and a horizontal axis labeled minutes. the positions of the peaks on this axis are given as t sub r in the text, and the widths at half height are given as w sub one half. peak component t r (min) w 1/2 (min) 1 acetaminophen 3.97 0.12 2 caffeine 6.15 0.21 3 benzoic acid 9.73 0.35 4 aspirin 14.8 0.73 calculate the number of theoretical plates, n , for the peaks of acetaminophen and caffeine. acetaminophen: n = plates caffeine: n = plates calculate the resolution, r , between acetaminophen and caffeine. r =

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?

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.

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines