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A dc series motor operates at 750 r/min with a line current of 100 A from the 250-V mains. Its armature-circuit resistance is 0.15 Ω and its series-field resistance is 0.1 Ω. Assuming that the flux corresponding to a current of 25 A is 40% of that corresponding to a current of 100 A, determine the motor speed at a line current of 25 A at 250 V.
A process modification has been devised that will increase the yield to 75%. The additional investment required is $1,250,000, and the additional operating costs are negligible. Is the modification worth making?
A preliminary (Class 4) estimate of the ISBL capital cost of building a 200,000 ton per year ethanol plant by corn dry milling has been stated as $130 MM -30%/+50%.
In Bertrand competition firms decide independently what prices to set to maximizetheir individual profits. Suppose that there are two firms in a market sellingthe same product. Let D(p) = 9 - p be the market demand and let c1 = 1 andc2 = 7 be firm 1 ..
Using the results of part (a), show that the electrons will fail to reach the second plate if (see the attached file for the equation) where -e and m are the charge and mass of an electron.
Calculate the percentage of solvent in the dried fabric by weight. What is the concentration of solvent in the dryer exhaust (in g/m3) if the exhaust is at 80 degrees C and 1 atm? The solvent has a molecular weight of 86.
CHE 352 – Spring 2014, In this assignment, students will review some of the concepts of measurements discussed, 4 methods of measuring temperature, 4 methods of measuring fluid pressure
Design a condenser for the following duty: 45,000 kg/h of mixed light hydrocarbon vapors to be condensed. The condenser is to operate at 10 bar. The vapor will enter the condenser saturated at 60 °C and the condensation will be complete at 45 °C.
Calculate the mass flow rate of distillate and bottom product per hour - the mass flow rate of liquid entering the reboiler and the vapour leaving the reboiler per hour.
Problem 1 Provider JCN Bell Comtron Choose? No. of problems 50 100 250 MTBF (hours) Mean Time to Reach Customer Mean Time to Fix Problem 3 2 1 2 1 0.5 System Availability Problem
For the conditions indicated in Prob. 7, prepare a log-log plot of fluid velocity in feet per second versus optimum economic pipe diameter in inches. The plot should cover a fluid-velocity range of 1 to 100 ft/s and a pipe-diameter range of 1 to 1..
Determine the concentration of biomass at t=2h assuming quasi steady state. If alpha=0.2g/g Determine the concentration of product at t=2h assuming P0=0
Determine the acceleration potential (in Volts) that must be applied to electrons so that in an electron diffraction experiment of {200} planes of silver, Ag, they will result in first order diffraction at 2?
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