Problem 3.2 The volume flowrate of 25 L/min of water at 60 °C flows inside a steel (k=36 W/(m.°C)) horizontal duct with 15 mm internal diameter and 2.5 mm thickness. Evaluate the heat locally lost by the water to the ambient air if: a) Air is quiescent, at 10 °C; b) Air, at 10 °C, flows perpendicularly to the horizontal duct with a velocity of 5 m/s.
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- i need help with calculating rate of diffusion for 3 crystals and 6 crystals Diffusion Diffusion Diffusion Spot Spot Time Spot Diameter 1 Diameter 3 Diameter 6 (min) Crystal Crystals Crystals (mm) (mm) (mm) 10 15 0-15 0-15 20 16 0-16 0-16 30 18 0-18 0-18 Time Rate of Diffusion for Rate of Diffusion for 3 Crystals Rate of Diffusion for 6 Crystals (min) 1 Crystal (mm/hr) 0-10 90 0-20 48 0-30 36 (mm/hr) (mm/hr) Rate [mm/h] = (diameter [mm] / time [min]) x 60 [min] XOutput from a process contains 0.01 proportion of defective units. Defective units that go undetected into final assemblies cost $26 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. The inspector, who can test 21 units per hour (which matches the current production rate), would be paid $9 per hour, including fringe benefits. Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection operation is added. A. Without the inspector, what is the current hourly cost of defects? (Round your answer to 2 decimal places.) B. If the inspection operation is added, what would be the cost to inspect each unit? (Round your answer to 2 decimal places.) C. What would be the benefit (or loss) from establishing the inspection process per unit? (Input the amount as a positive value. Round your answer to 2 decimal places.)Classify the following risks into variation, foreseen uncertainty, unforeseen uncertainty, and chaos:b. A machine on the plant floor breaks down for an hour
- . Mary and Tom operate a lemonade stand. They are concerned that the lemonade doesnot taste fresh at the end of the day. Which of the following variables is an environmental variable in their operation?a. The temperature of the lemonade when they take it out of their refrigerator in themorningb. The temperature of the air during the dayc. The temperature of the lemonaded. The temperature of the water used to make the lemonadeOutput from a process contains 0.02 defective unit. Defective units that go undetected into final assemblies cost $25 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test 20 units per hour, is paid $8 per hour, including fringe benefits. Should an inspection station be established to test all units? Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection operation is added. a-1. Without the inspector, what is the current hourly cost of defects? a-2. Should an inspection station be established to test all units based on costs alone? multiple choice Yes No a-3. If the inspection operation is added, what would be the cost to inspect each unit? Note: Round your answer to 2 decimal places. b. What would be the benefit (or loss) from establishing the inspection process? Note: Round your answer…ANSWER AS BEST AS YOU CAN FOR A THUMBS UP An oriented-strand board manufacturer operated its plant on a 24-hour, 7-day work week with two 12-hours shifts. Shift changes occurred at 8:00 am and 8:00 pm. At approximately 8:30 pm on January 18, 2001, a wet hog, which was located in a wood room, dropped off line and would not operate. The wet hog was used to grind tree bark and wood residue into a wet fuel used in wet-fuel burners in the plant. The wet hog was not essential to the operation of the plant, and whether or not it was operating had no effect on other operations in the plant. An electrician was assigned to repair the hog. At approximately 10:30 pm, he entered the motor control room and opened a 2300-volt motor circuit breaker. He caused an electrical fault in the circuit breaker, apparently by contacting energized parts inside the circuit breaker cubicle, and…
- The following is the temperature control system of a heat exchanger. a)Identify the type of system. b) Calculate the steady state error when it is subjected to an input. r(t) = 2 c) Calculate the steady state error when subjected to an input. r(t) = 3t R(s) 15 C(s) 5³ - 5²² + 5s69 Output from a process contains 0.02 defective unit. Defective units that go undetected into final assemblies cost $25 each to replac An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test 22 units per hour, is paid $10 per hour, including fringe benefits. Should an inspection station be established to test all units? ume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection ration is added. a-1. Without the inspector, what is the current hourly cost of defects? Note: Round your answer to 2 decimal places. a-2. Should an inspection station be established to test all units based on costs alone? a-3. If the inspection operation is added, what would be the cost to inspect each unit? Note: Round your answer to 2 decimal places.The output from a process contains a 0.02 defective unit. Defective units that go undetected into final assemblies cost $25 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test 20 units per hour, is paid $8 per hour, including fringe benefits. Should an inspection station be established to test all units?a. What is the cost to inspect each unit?b. What is the benefit (or loss) from the inspection process?
- Consider the mixing process shown in the figure. A mixing chamber initially contains 4 liters of a clear liquid. Clear liquid flows into the chamber at a rate of 10 liters per minute. A dye solution having a concentration of 0.25 kilograms per liter is injected into the mixing chamber at a constant rate of liters per minute. When the mixing process is started, the well-stirred mixture is pumped from the chamber at a rate of 10 + r liters per minute. (a) Develop a mathematical model for the mixing process. Let Q represent the amount of dye in kilograms in the mixture. (dQ/dt)=? (b) The objective is to obtain a dye concentration in the outflow mixture of 0.1 kilograms per liter. What injection rate r is required to achieve this equilibrium solution? r = ? Would this equilibrium value of r be different if the fluid in the chamber at time t=0 contained some dye? yes, no or maybe? (c) Assume the mixing chamber contains 4 liters of clear liquid at time t. How many minutes will it take…SCENARIO A: A woodcutting operation has a target (nominal) value of 200 inches and consistently averages 200.1 inches with a standard deviation of .05 inches. The design engineers have established an upper specification limit of 200.25 and a lower specification limit of 199.75 inches. The process capability ratio, Cp, of the operation is: Group of answer choices a Less than 1 b Greater than or equal to 1 but less than 1.25 c Greater than or equal to 1.25 but less than 1.5 d Greater than or equal to 1.5 but less than 1.75 e Greater than or equal to 1.75 but less than 2 f Greater than or equal to 269) please help with this Output from a process contains 0.02 defective unit. Defective units that go undetected into final assemblies cost $25 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test 22 units per hour, is paid $10 per hour, including fringe benefits. Should an inspection station be established to test all units? Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection operation is added. b. What would be the benefit (or loss) from establishing the inspection process? Note: Input the amount as a positive value. Round your answer to 2 decimal places.
