A steam power plant operates on the cycle shown in the following figure. If the isentropic efficiency of the turbine is 87% and the isentropic efficiency of the pump is 85%. Determine (a) the thermal efficiency of the cycle [answer = 36.1%] and (b) the net power output of the plant for a mass flow rate of 15 kg/s. [answer = 18.9 MW]
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- Harold Grey owns a small farm in the Salinas Valley that grows apricots. The apricots are dried on the premises and sold to a number of large supermarket chains.Based on past experience and committed contracts, he estimates that sales over thenext five years in thousands of packages will be as follows:Forecasted DemandYear (thousands of packages)1 3002 1203 2004 1105 135Assume that each worker stays on the job for at least one year, and that Greycurrently has three workers on the payroll. He estimates that he will have 20,000packages on hand at the end of the current year. Assume that, on the average, eachworker is paid $25,000 per year and is responsible for producing 30,000 packages. Inventory costs have been estimated to be 4 cents per package per year, andshortages are not allowed.Based on the effort of interviewing and training new workers, Farmer Greyestimates that it costs $500 for each worker hired. Severance pay amounts to$1,000 per worker.a. Assuming that shortages are not…12.2. The manager of the I-85 Carpet Outlet needs to be able to forecast accurately the demand for Soft Shag carpet (its biggest seller). If the manager does not order enough carpet from the carpet mill, customers will buy their carpets from one of the outlet’s many competitors. The manager has collected the following demand data for the past eight months: Month Demand for Soft Shag Carpet (1000 yd)1 52 103 64 85 146 107 98 12 a. Compute a three-month moving average forecast for months 4 through 9. b. Compute a weighted three-month moving average forecast for months 4 through 9. Assign weights of .55, .33, and .12 to the months in sequence, starting with…a) Suppose you walk into a large supermarket at 2 am with a friend. Your friend says, "I can't believe that these stores stay open all night. Only one out of fifteen checkout lines is open. There can't be more than ten shoppers in this store. It just doesn't make any sense for this store to be open all night." What conditions must be true for it to be to the advantage of the supermarket to stay open all night? b) Your friend has a large garden and grows fresh fruit and vegetables to be sold at a local "farmer's market." Last year your friend was the only worker in the garden, without any additional workers. However, this year your friend hired a worker and production more than doubled. He comments "Next summer, I think I'll hire another two workers (so total workers including myself would go up from 2 to 4) and my output should again more than double". Is it likely that he could hire more workers and always continue to reap greater than proportional increases in production? Why?
- Please include an excel sheet showing calculationsA machine can be purchased at t = 0 for $20,000. The estimated life is 5 years, with an estimated salvage value of zero at that time. The average annual operating and maintenance expenses are expected to be $5,500. If MARR = 10%, what must the average annual revenues be in order to be indifferent between (a) purchasing the machine or (b) doing nothing?The Grand Bakery produces 60 special sourdough rolls every day. Any rolls that are not sold each day are given to the employees. They have collected sales data from the past week: Day Rolls sold 1 50 2 50 3 48 4 60 5 53 6 60 What is the value of F6 if they use a 3-day weighted moving average with W1 = 0.6, W2 = 0.2, and W3 = 0.2? Using the data from above, calculate the forecast for period 7 using a four-period moving average:
- The director of surgery at a local hospital is interested in understanding his unit’s costs. An assistant collected data for the past 36 months on unit cost (labor, supplies, and so on) along with the number of procedures performed in the unit. The assistant analyzed the data using a spreadsheet program, and the following output was generated. Equation Intercept $ 1,013,000 Coefficient on procedures $ 210 Statistical data Correlation coefficient 0.553 R2 0.303 The unit is planning to perform an average 13,500 procedures per month for the coming year. Required: a. Use the regression output to write the surgical unit cost equation. b. Based on the cost equation, compute the estimated costs for the surgical unit per month for the coming year. c. The director of surgery has asked you for advice on whether he should rely on the estimate.The number of hybrid cars that have be requested for rental from a car rental office during a 50 day sample period is given in the following table. Demand for Cars Number of Days Probability 3 3 0.06 4 7 0.14 5 12 0.24 6 14 0.28 7 10 0.20 8 4 0.08 50 1.00What is the expected (mean) number of hybrid rentals per day? Compute to one decimal place.A loan processing operation at a local bank processes an average of 7 loans per day. The operation has a design capacity of 10 loans per day and an effective capacity of 8 loans per day. What is the utilization of the processing operation? Select one: a. 100.0% b. 87.5% c. 70.0% d. 80.0% Warranty expense, the cost that a business incurs for the repair or replacement of goods that has sold, is an example of which of the following? Select one: a. Internal failure cost b. Appraisal cost c. Prevention cost d. External failure cost