EBK BASICS OF ENGINEERING ECONOMY
EBK BASICS OF ENGINEERING ECONOMY
2nd Edition
ISBN: 8220100255052
Author: Blank
Publisher: MCG
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Chapter 4, Problem 45P
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A process can be completed using either Alternative X or Y, where Y is an automated version of X. Alternative X has fixed costs of $10,000 per year with a variable cost of $50 per unit. If the process is automated, the fixed cost for Y will be $5,000 per year and its variable cost will be only $30 per unit. The minimum number of units that must be produced each year for alternative Y to be favored is closest to:a. Alternative Y will be favored for any level of productionb. 125c. 375d. Alternative X will be favored for any level of production
Accurate air flow measurement requires straight, unobstructed pipe for a minimum of 10 diameters upstream and 5 diameters downstream of the measuring device. In one particular application, physical constraints compromised the pipe layout, so the engineer was considering installing the air flow probes in an elbow (Plan A), knowing that flow measurement would be less accurate but good enough for process control. This plan would be acceptable for only 2 years, after which a more accurate flow measurement system with the same costs will be available. Plan A has a first cost of $25,000 with annual M&O estimated at $4000. Plan B involves installation of a recently designed submersible air flow probe. The stainless steel probe could be installed in a drop pipe with the transmitter located in a waterproof enclosure on the handrail. The cost of this system will be $88,000, but because it is accurate, it would not have to be replaced for at least 6 years. Its maintenance cost is estimated to…
An engineer is trying to decide which process to use to reduce sludge volume prior to disposal. Belt filter presses (BFP) will cost $203,000 to buy and $85,000 per year to operate. Belts will be replaced one time per year at a cost of $5500. Centrifuges (Cent) will cost $396,000 to buy and $119,000 per year to operate, but because the centrifuge will produce a thicker “cake”, the sludge hauling cost to the monofill will be $37,000 per year less than for the belt presses. The useful lives are 5 and 10 years for alternatives BFP and Cent, respectively, and the salvage values are assumed to be 10% of the first cost of each process whenever they are closed down or replaced. Use PW evaluation to select the more economical process at an interest rate of 6% per year over (a) the LCM of lives, and (b) a study period of 8 years. Are the decisions the same?

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EBK BASICS OF ENGINEERING ECONOMY

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