MyOMLab Principles of operations management : Sustainability and supply chain management (Book & eText Access Card)
10th Edition
ISBN: 9780134184111
Author: Jay Heizer, Barry Render, Chuck Munson
Publisher: PEARSON
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Question
Chapter 17, Problem 4P
a)
Summary Introduction
To determine: The percentage of failures.
b)
Summary Introduction
To determine: The number of failures per unit hour.
c)
Summary Introduction
To determine: The number of failures per unit year.
d)
Summary Introduction
To determine: The number of units to fail during the following year.
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Students have asked these similar questions
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).
Robert Klassan Manufacturing, a medical equipment manufacturer, subjected 90 heart pacemakers to 4,000 hours of testing. Halfway through the testing, 6 pacemakers failed.
The failure in terms of:
A.) Percent of Failures =?% (enter your response as a percentage rounded to one decimal place)
B.) Number of Failures per unit-hour= ? Failures per hour (round your response to eight decimal places).
C.) Number of Failures per unit-hear= ? Failures per year (round your response to four decimal places)
D.) If 1,100 people receive pacemaker implants, how many units can we expect to fail during the following year?
Number of Failures= ? failures (round your response to two decimal places).
This was an example problem given to me. I have a test with a similar question in April. Any explanation would be greatly appreciated.
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 failure
Chapter 17 Solutions
MyOMLab Principles of operations management : Sustainability and supply chain management (Book & eText Access Card)
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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- An 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_forwardDellana Company tested 50 products for 75 hours each. During this time, it experienced four breakdowns. Compute the number of failures per hour. What is the mean time between failures? Collier Company tested 200 products for 100 hours each. During this time, it experienced 12 breakdowns. Compute the number of failures per hour. What is the MTBF? Crager Company tested 100 products for 50 hours each. During the test, three breakdowns occurred. Compute the number of failures per hour and MTBF.arrow_forwardRick Wing, salesperson for Wave Soldering Systems,Inc. (WSSI), has provided you with a proposal for improving thetemperature control on your present machine. The machine uses ahot-air knife to cleanly remove excess solder from printed circuitboards; this is a great concept, but the hot-air temperature controllacks reliability. According to Wing, engineers at WSSI haveimproved the reliability of the critical temperature controls. Thenew system still has the four sensi tive integrated circuits controllingthe temperature, but the new machine has a backup for each.The four integrated circuits have reliabilities of .90, .92, .94, and.96. The four backup 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 four of thebackup units to .93. What is the reliability of this option?arrow_forward
- David Hall, chief of the maintenance departmentat Mechanical Dynamics, has presented you with the following failure curve. What does it suggest?arrow_forwardA 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_forwardOne of the solar instruments on a satellite has three major parts, all of which must operate. Two have reliabilities of .7 and the other has a reliability of .9. In case the system fails, there is an identical backup system that kicks on automatically. The overall reliability of the system, including the backup, is closest to:arrow_forward
- Suppose that a product is designed to work for 1,000 hours with a 2% chance of failure. Find the average number of failures per hour and the MTTF. A product has been used for 5,000 hours with 1 failure. Find the mean time between failures (MTBF) and λ.arrow_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_forwardWhat is the reliability of the following parallel pro-duction process? R1 5 0.95, R2 5 0.90, R3 5 0.98.arrow_forward
- Supposed the constant failure rate for both the main and the standby units are constant and are given by λ= 0.02 per hour, and the constant failure rate of the switching and sensing unit is λSW =0.01 per hour.(c) Find the reliability of this system for an operating time of 50 hoursarrow_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_forward0.855 1((1-0.645)x(1-0.800)) = 0.0710 1-0.0710 = 0.929 0.929 0.999 0.855 x 0.929 x 0.999 = 0.7935 Reliability of the system is 0.7935arrow_forward
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