SUBJECT: ENGINEERING ECONOMY TOPIC: Present Economy Problems

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1. A cement kiln with production capacity of 130 tons per day(24 hours) of clinker has its burning zone about 45 tons of magnesite chrome bricks being replaced periodically, depending on some operational factors and the life of the bricks. |f locally produced bricks costs P25,0DU per ton and have a life of 4 months, while certain imported bricks costing P303130 per ton and have a life of 6 months, determine the more economical bricks and by how much it is cheaper? 2. A paint manufacturing company uses a sand mill for ne grinding of paint with an output of 100 liters per hour using glass beads as grinding media. Media load in the mill is 25kg costing P200 per kg, and is fully replenished in 2 months time. at 8 hours per day operation, 25 days per month. A ceramics grinding media is offered to this paint company, costing P400 per kg and needs 30 kg load in the sand mill, but guarantees an output of 120 liters per hour and full replenishment of media in 3 months. If prots on paint production is P15 per liter, would you recommend the change in media? Show by comparative costs to justify your answer. 3. A machine used for cutting materials in a factory has the following outputs per hour at various speeds and requires pen'odic tool regrinding at the intervals cited. Speed Outputs per hour Tool regrinding A 200 pieces every 8 hours B 280 pieces every 5 hours A set of tools cost P1260 and can be ground 20 times. Each regrinding costs P54 and the time needed to regrind and change tools is 1 hour. The machine operator is paid P1920 per hour, including the time the tool is changed. The tool grinder who also sets the tools to the machines is paid P21 per hour. The hourly rate chargeable against the machine is P38, regardless of machine speed. Which speed is more economical