OPERTATIONS MGMT:SUSTAINABILITY
2nd Edition
ISBN: 9781323751718
Author: HEIZER
Publisher: PEARSON
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Chapter 17, Problem 20P
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To explain: The suggestion.
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David Hall, chief of the maintenance department at
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A manufacturer of disk drives for notebook computers wants a MTBF of at least 50,000 hours. Recent test results for 15 units were one failure at 12,000 hours, one at 20,000 hours, and one more at 48,000 hours. The remaining units were still running at 60,000 hours.
Determine the following:
Number of failures per unit-hour of operating time = failures per hour (round your response to eight decimal places).
Even after taking all appropriate steps to produce a high integrity system, some remaining faults will remain. How would you ensure system safety and reliability in practical approaches?
Chapter 17 Solutions
OPERTATIONS MGMT:SUSTAINABILITY
Ch. 17 - Prob. 1EDCh. 17 - Prob. 1DQCh. 17 - Prob. 2DQCh. 17 - Prob. 3DQCh. 17 - Prob. 4DQCh. 17 - What is the trade-off between operator-performed...Ch. 17 - Prob. 6DQCh. 17 - Prob. 7DQCh. 17 - Prob. 8DQCh. 17 - Prob. 9DQ
Ch. 17 - Prob. 10DQCh. 17 - Prob. 1PCh. 17 - Prob. 2PCh. 17 - Prob. 3PCh. 17 - Prob. 4PCh. 17 - Prob. 5PCh. 17 - Prob. 6PCh. 17 - Prob. 7PCh. 17 - Prob. 8PCh. 17 - Prob. 9PCh. 17 - What is the reliability of the system shown?Ch. 17 - Prob. 11PCh. 17 - Prob. 12PCh. 17 - Rick Wing, salesperson for Wave Soldering Systems,...Ch. 17 - Prob. 14PCh. 17 - Prob. 15PCh. 17 - What are the expected number of yearly breakdowns...Ch. 17 - Prob. 19PCh. 17 - Prob. 20PCh. 17 - Prob. 21PCh. 17 - Prob. 1CSCh. 17 - Prob. 2CSCh. 17 - Prob. 3CS
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- Reliability metrics includes: Select one: a. Probability of failure on demand, Rate of occurrence of failures/Mean time to failure, and Availability b. Probability of failure on demand c. Availability d. Rate of occurrence of failures/Mean time to failurearrow_forwardElizabeth Irwin's design team has proposed the following system with component reliabilities as indicated: R2=0.88 R1=0.92 R4=0.92 R3=0.88 The overall reliability of the proposed system = % (enter your response as a percentage rounded to two decimal places). Hint: The system functions if either R2 or R3 work.arrow_forwardwhich type of failure management should attempt to eliminate first.arrow_forward
- A serial system is assembled in house from 20 parts. To be successful in the marketplace the system has to have three sigma reliability. What level of reliability of each part is necessary to achieve that level of the overall performance?arrow_forwardReliability can be considered a dimension of either product or service quality. Select one: O a. TRUE O b. FALSEarrow_forwardRick Wing, salesperson for Wave SolderingSystems, Inc. (WSSI), has provided you with a proposal forimproving the temperature control on your present machine.The machine uses a hot-air knife to cleanly remove excess solder from printed circuit boards; this is a great concept, butthe hot-air temperature control lacks reliability. According toWing, engineers at WSSI have improved the reliability of thecritical temperature controls. The new system still has the foursensitive integrated circuits controlling the temperature, butthe new machine has a backup for each. The four integratedcircuits have reliabilities of .90, .92, .94, and .96. The fourbackup circuits all have a reliability of .90.a) What is the reliability of the new temperature controller?b) If you pay a premium, Wing says he can improve all fourof the backup units to .93. What is the reliability of thisoption?arrow_forward
- Rick Wing, salesperson for Wave Soldering Systems, Inc. (WSSI), has provided you with a proposal for improving the temperature control on your present machine. The machine uses a hot-air knife to cleanly remove excess solder from printed circuit boards; this is a great concept, but the hot-air temperature control lacks reliability. According to Wing, engineers at WSSI have improved the reliability of the critical temperature controls. The new system still has the four sensitive integrated circuits controlling the temperature, but the new machine has a backup for each. The four integrated circuits have reliabilities of 0.84 0.86 0.88 and 0.90 The four backup circuits all have a reliability of 0.84 Part 2 a) The overall reliability of the new temperature controller = enter your response here% (enter your response as a percentage rounded to two decimal places).arrow_forwardRick Wing, salesperson for Wave Soldering Systems, Inc. (WSSI), has provided you with a proposal for improving the temperature control on your present machine. The machine uses a hot-air knife to cleanly remove excess solder from printed circuit boards; this is a great concept, but the hot-air temperature control lacks reliability. According to Wing, engineers at WSSI have improved the reliability of the critical temperature controls. The new system still has the four sensitive integrated circuits controlling the temperature, but the new machine has a backup for each. The four integrated circuits have reliabilities of 0.840.84, 0.860.86, 0.880.88, and 0.900.90. The four backup circuits all have a reliability of 0.840.84. Part 2 a) The overall reliability of the new temperature controller = 92.2592.25% (enter your response as a percentage rounded to two decimal places). Part 3 b) If you pay a premium, Wing says he can improve all four of the backup units to 0.870.87.…arrow_forwardAn office security system at PAC Ltd has two component parts, both of which must work for the system to function. Part 1 has a reliability of 80 percent, and part 2 has a reliability of 98 percent. Compute the reliability of the system.arrow_forward
- A manufacturer of disk drives for notebook computerswants an MTBF of at least 50,000 hours. Recent test results forI 0 units were one failure at 10,000 hours, another at 25,000 hours,and two more at 45,000 hours. The remaining units were still runningat 60,000 hours. Determine the following:a) Percentage of fa iluresb) N umber of fai lures per unit-hour of operating timec) MTBF at this point in the testingarrow_forwardExplain why a product or system might have an overall reliability that is low even though it is com- prised of components that have fairly high reliabilities.arrow_forwardIn the context of system reliability, explain the difference between Mean Time Between Failures (MTBF) and Mean Time To Recovery (MTTR). How do these metrics impact system design?arrow_forward
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