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Quiz_11_1

Quiz_11_1 - B L,366 Q uiz1 1A F all,Og N ame s et*v o l(90...

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BL,366 Quiz 11A Fall',Og Name set-*v o ,/ l(90%) A continuous electric current of 2750 amps is to be transmitted from a generator to a transfomer located 300 feet away. A copper conductor can be installed for \$g per pound, will have an estimated life of25 years, and can be salvaged for \$2 per pound. The density of copper is 555 lb per cubic foot. power loss from the conductoi is inversely proportional to the cross-sectional area of the conductor and can be expressed as 18.48/A kilowatts, where A is in square inches. Assume cost of energy is \$0.b6 per kilowatt-hour and use an MARR of 10%. Find the optimal cross-sectional area ofthe conductor. T = (/-L -)i 15t-'v 4,n')/ /+- \1 '.oy*\ = 't f zsofi ' /b // \ {_r' ^ /l )i+,,;- )\ / \ r i Losses .= ,J.+s t"/ ( tTbo h ^ \(d Zqt, \ '='q,7rz'o1 /r/ "/"n * | -3. )\ h;h J --F- / clc -. rz s)(a/r, , ,u)+ i t = (6c a7.(oY o.//o/1)+(/)(z,7rz.(o) & n - = 7f e, w-* Per 1€G-/ 42c= cl + Lot,t'e{' ?rs:,ttrf l- ?,7r1'o7 -*"ft dJlg = qEt.s? ^ q7/3.o1 : o *+ -*= g./J? hL' - t , t (L r /t -- z*--- 2(10%) A20 horsepower electric motor has an efficiency of 87 .5Yo at 100% load. The conversion factor from horsepower to kW is 0.746 kW per hp. What axe the motor losses

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Quiz_11_1 - B L,366 Q uiz1 1A F all,Og N ame s et*v o l(90...

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