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EXAMINATION 1_ Version A

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EXAMINATION 1_ Version A Powered By Docstoc
					Professor Blake

OPM 101 Spring 2009

Name____________________________

EXAMINATION 3, Version C Use a Scantron Form No. 886-E to record your choice of the best answer to each of the following questions. You have the full period to answer the questions. The following questions are worth three (3) points each. 1. Hand tools, lubricants, and cleaning supplies are usually examples of what? a) WIP inventory b) finished goods inventory c) raw materials inventory d) distribution inventory e) MRO inventory 2. If the EOQ is ordered, which of the following is true? a) Annual ordering cost exceeds annual holding cost. b) Annual holding cost exceeds annual ordering cost. c) Annual ordering cost is equal to annual holding cost. d) The sum of annual ordering cost plus annual holding cost is maximized. e) The annual holding cost curve is decreasing. 3. The ranking in ABC inventory analysis is based on what? a) annual dollar usage b) annual demand in units c) alphabetical order d) unit price e) item number 4. What type of aggregate plan maintains a constant workforce and produces the same amount of product in each time period? a) uniform b) level c) chase d) mixed e) steady 5. Evaluating an aggregate plan in terms of employment stability is using what perspective? a) cost b) customer service c) quality d) operations e) human resources 6. When a company’s product is nontangible (a service), which of the following is no longer a viable option? a) hiring permanent employees b) subcontracting c) inventory d) working overtime e) increasing normal capacity 1

Professor Blake

OPM 101 Spring 2009

Name____________________________

7. Companies use to check that enough work is scheduled for operations and that the amount of work scheduled is feasible. a) capacity management b) closed-loop requirements planning c) cut requirements planning d) capacity resources planning e) capacity requirements planning 8. The details the company’s planned products, quantity, and the schedule used by marketing when promising deliveries. a) master production schedule b) bill of material c) inventory records d) material product sales e) promised deliveries 9. For any period the beginning inventory, plus any replenishment orders due, less the gross requirement equals a) planned orders b) projected available quantity c) scheduled receipts d) lead time e) safety stock 10. The gross requirements of a given component part are determined from __________________________. a) scheduled receipts plus projected available b) gross requirements of the parent c) planned orders of the parent d) projected available of the end item e) planned orders of the end item 11. What does job flow time measure? a) the time a job spends in the shop b) due-date performance c) the amount of time it takes to finish a batch of jobs d) job tardiness e) job lateness 12. Which of the following is a measure of whether the job is done ahead of, on, or behind schedule? a) average number of jobs in system b) mean flow time c) makespan d) job tardiness e) job lateness

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Professor Blake

OPM 101 Spring 2009

Name____________________________

13. Which of the following scheduling rules is often considered the fairest rule? a) first come, first served b) last come, first served c) earliest due date d) shortest processing time e) longest processing time 14. Five jobs must be scheduled. Each of the jobs must be processed on two machines (A and B) in the same order. The processing times are listed below. According to Johnson’s rule, in what order should the jobs be processed? Job Machine A Machine B A 6 30 B 23 2 C 1 7 D 4 3 E 8 8 a) C-B-D-A-E b) C-D-A-E-B c) B-E-A-D-C d) C-A-E-D-B e) C-D-E-B-A 15. Only Roses Flower Shop currently operates 7 days per week. The staffing needs for each day are shown in the following table. Each of the employees must have two consecutive days off in a week. (Since Monday is used as the first day of the pay week, an employee cannot be off on both Sunday and Monday.) What is the minimum number of employees that needs to be hired? Days of Week Monday Tuesday Wednesday Thursday Friday Saturday Sunday Staff Need 2 3 4 4 5 4 6 a) 5 b) 6 c) 7 d) 8 e) 9 16. Actions that consume resources and/or time are project ______________________. a) events b) activities c) nodes d) arrows e) tasks 17. The sum of the activity times on the critical path determines ____________________________________. a) total slack available b) total labor time required for the project c) minimum time to complete the project d) the number of milestones e) amount of crashing that needs to be done 3

Professor Blake

OPM 101 Spring 2009

Name____________________________

18. An activity in a network diagram has an optimistic time estimate of five days, a most likely time estimate of seven days, and a pessimistic time estimate of 15 days. Its expected time is ____________. a) 5 days b) 7 days c) 8 days d) 10 days e) 15 days 19. You may be able to speed up completion of a project by ________________________________. a) reducing the standard deviation of activities b) recalculating the critical path c) making additional resources available d) adding slack to critical activities e) redoing some of the activities 20. Lot-for-lot ordering is commonly used in materials requirements planning systems. a) True b) False 21. An advantage of the chase aggregate plan is that it minimizes finished good holding costs. a) True b) False 22. A primary objective of the master production schedule is to achieve the desired customer service level. a) True b) False 23. The gross requirements of a given component part are determined from planned orders of the parent. a) True b) False 24. Crashing is shortening the total time for completing a project by incurring higher costs from shortening activities. a) True b) False

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Professor Blake

OPM 101 Spring 2009

Name____________________________

The following problems are worth ten (10) points each. 1. Suppose that your company sells a product for which the annual demand is 10,000 units. Holding costs are $1.00 per unit per year, and setup costs are $200 per order (a) What is the economic order quantity for your product? Q = square root [2DS/H] = square root [2(10,000)(200)/1.00] = 2,000 units (b) What is the total annual cost of ordering and holding? TC = [D/Q]*S + [Q/2} * H = [10,000/2,000] * 200 + [2,000/2] * 1.00 = $1,000 + $1,000 = $2,000 2. Given the following data: Run Time Per unit in Item Setup Time Standard Number Period Quantity (Hours) Hours KE738 3 600 7.6 0.25 157.60 KR376 3 350 3.7 0.55 196.20 KM276 3 700 7.6 0.70 497.60 KW718 4 400 5.0 0.25 105.00 KJ395 4 250 8.9 0.40 108.90 KA729 4 500 3.6 0.30 153.60 KP237 4 600 5.0 0.65 395.00 (a) What are the workloads for periods 3 and 4? Period 3: 157.60 + 196.20 + 497.60 = 851.40 Period 4: 105.00 + 180.90 + 153.60 + 395.00 = 762.50 (b) There are 168 hours of operating time per machine each period. How many machines should be operated for periods 3 and 4? Period 3: 851.40/168 = 5.07 ~ 6 machines Period 4: 762.50/168 = 4.54 ~ 5 machines 3. The following jobs are waiting to be processed at J. J. Rupper’s work center. Job A B C D E Production Days Needed 20 30 16 10 18 Due Date 135 190 140 125 150

Customers usually do not pick up orders before the due date. Today is day 100. Using the SPT priority rule, calculate the (a) mean flow time, (b) average number of jobs in the system, and (c) average job tardiness.

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Professor Blake

OPM 101 Spring 2009 Flow time 10 26 44 64 94 238

Name____________________________

SPT D C E A B

time 10 16 18 20 30 94

due date (-100) tardiness 25 0 40 0 50 0 35 29 90 4 33

a) Mean flow time = 238/5 = 47.60 days b) Average # of jobs in system = 238/94 = 2.53 jobs c) Average tardiness = 33/5 = 6.60 days

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