Question 1

Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure.

Accepted Answer

A) True 
 B)False  True

Question 2

Components A,B,and C are connected in series.Component D is connected in parallel to component B.Which of the following statements is true?

Accepted Answer

A) The system works only if A works,B or C works,and D works. 
B) Component B must work for the system to work. 
C) The system works when A works,C,works,and either B or D works. 
D) Components B and C are backups to A. 
E) The system works if D works,and any of A,B,or C works. 
A) The system works only if A works,B or C works,and D works. 
B) Component B must work for the system to work. 
C) The system works when A works,C,works,and either B or D works. 
D) Components B and C are backups to A. 
E) The system works if D works,and any of A,B,or C works. C

Question 3

As a firm's maintenance commitment increases:

Accepted Answer

A) the breakdown maintenance costs increase,and the preventive maintenance costs decrease. 
B) both the breakdown maintenance costs and the preventive maintenance costs decrease. 
C) the breakdown maintenance costs decrease,and the preventive maintenance costs increase. 
D) both the breakdown maintenance costs and the preventive maintenance costs increase. 
E) None of the above is true. 
A) the breakdown maintenance costs increase,and the preventive maintenance costs decrease. 
B) both the breakdown maintenance costs and the preventive maintenance costs decrease. 
C) the breakdown maintenance costs decrease,and the preventive maintenance costs increase. 
D) both the breakdown maintenance costs and the preventive maintenance costs increase. 
E) None of the above is true. C

Question 4

________ combines total quality management with a strategic view of maintenance from process equipment design to preventive maintenance.

Accepted Answer

Total prev

Question 5

Describe how the Orlando Utilities Commission obtains competitive advantage through its maintenance practices.

Accepted Answer

The company recognizes the importance of

Question 6

Is there an optimal amount of preventive maintenance? What caution should be exercised before calculating this optimal amount?

Accepted Answer

Too little preventive maintenance causes

Question 7

Why is it that many cost curves associated with maintenance rarely consider the full cost of a breakdown?

Accepted Answer

Many costs are ignored because they are

Question 8

A component must have reliability of .9925.Two technologies are available for this component: one produces a component with .999 reliability at a cost of $2000.Another produces a component with .73 reliability at a cost of $450.Which is cheaper: one high quality component or a parallel set of inferior components? (Hint: for the inferior components,you first need to determine the number of them that would be needed to ensure overall reliability of .9925.)

Accepted Answer

First,determine how many of the 0.73 rel

Question 9

Suppose that a three-stage process in a nuclear reactor had reliability ratings of .98 at each station and that only one stage needed to be successful for the process to work.If the plant wants to establish 6-sigma standards (≤ 3.4 defects per million),what % reliable redundant controls need to be added to each station.

Accepted Answer

For 6-sigma standards,the reliability mu

Question 10

General Grant must send orders to General Butler.Carrier pigeons are the medium of choice.A single pigeon has a .7 probability of arriving at the proper destination in a timely fashion.How many pigeons,each carrying an identical set of orders,must Grant send in order for him to have 98% confidence that the orders reached General Butler?

Accepted Answer

2: 0.91 3: 0.973 4: 0.9919; on

Question 11

A product has four components A,B,C,and D.The finished product must have a reliability of at least .95.The first three components come from a supplier,and they have reliabilities of .99,.98,and .995,respectively.The fourth component is being designed now.What must the reliability of component D be in order to meet the product reliability condition?

Accepted Answer

System reliability must be at least .99

Question 12

________ consists of all activities involved in keeping a system's equipment in working order.

Accepted Answer

The answer of ________ consists of all activities involved in...

Question 13

What is the reliability of a four-component product,with components in series,and component reliabilities of .90,.95,.98,and .99?

Accepted Answer

A) 0.8295 
B) 0.90 
C) 0.955 
D) 0.99 
E) 0.945 
A) 0.8295 
B) 0.90 
C) 0.955 
D) 0.99 
E) 0.945

Question 14

________ is a plan that involves routine inspections,servicing,and keeping facilities in good repair to prevent failure.

Accepted Answer

Preventive

Question 15

Increasing the number of parts or components in a product tends to reduce its reliability.Why is this true only when adding components in series?

Accepted Answer

Adding parts in series involves an addit

Question 16

Ten high-intensity bulbs are tested for 100 hours each.One failed at 40 hours; all others completed the test.Calculate FR(%)and FR(N).

Accepted Answer

FR(%)= 1/10 or 10%;

Question 17

The academic service commonly referred to as "registration" consists of several smaller components: advising,registration for courses,fee assessment,financial aid calculations,and fee payment.Each of these modules operates independently and has some probability of failure for each student.If the five probabilities that accompany these services are 95%,90%,99%,98%,and 99%,respectively,what is the "reliability" of the entire product from the student's perspective,i.e.,the probability that all five will work according to plan?

Accepted Answer

Reliabilit

Question 18

________ is the failure rate early in the life of a product or process.

Accepted Answer

The answer of ________ is the failure rate early in...

Question 19

The Everstart is a battery with an intended design life of 72 months.Stephanie Bradley recently put five of these batteries through accelerated testing (the company couldn't wait six years)to simulate failure patterns.The test results had one failure at 26 months,one failure at 32 months,one failure at 50 months,and one failure at 62 months.Calculate FR(%),FR(N),and MTBF.

Accepted Answer

FR(%)= 4/5 or 80%.FR(N)= 4/(72

Question 20

What is FR(N)? How is it calculated? How are FR(N)and MTBF related?

Accepted Answer

FR(N)is the number of failures

Exam 18: Maintenance and Reliability

Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure.

Components A,B,and C are connected in series.Component D is connected in parallel to component B.Which of the following statements is true?

As a firm's maintenance commitment increases:

________ combines total quality management with a strategic view of maintenance from process equipment design to preventive maintenance.

Describe how the Orlando Utilities Commission obtains competitive advantage through its maintenance practices.

Is there an optimal amount of preventive maintenance? What caution should be exercised before calculating this optimal amount?

Why is it that many cost curves associated with maintenance rarely consider the full cost of a breakdown?

________ consists of all activities involved in keeping a system's equipment in working order.

What is the reliability of a four-component product,with components in series,and component reliabilities of .90,.95,.98,and .99?

________ is a plan that involves routine inspections,servicing,and keeping facilities in good repair to prevent failure.

Increasing the number of parts or components in a product tends to reduce its reliability.Why is this true only when adding components in series?

Ten high-intensity bulbs are tested for 100 hours each.One failed at 40 hours; all others completed the test.Calculate FR(%)and FR(N).

________ is the failure rate early in the life of a product or process.

What is FR(N)? How is it calculated? How are FR(N)and MTBF related?

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