Question 1

Infant mortality refers to the high failure rate often encountered in the very early stages of the lifetime of a product.

Accepted Answer

A) True 
 B)False  True

Question 2

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?

Accepted Answer

First determine how many of the 0.73 reliable components are needed: 2: 0.9271 3: 0.980317 4: 0.994686 Four are needed, which will cost $1800. This is cheaper than the $2000 single high-quality component.

Question 3

The objective of maintenance and reliability is to

Accepted Answer

A)  ensure that breakdowns do not affect the quality of the products. 
B)  ensure that no breakdowns will ever occur. 
C)  ensure that preventive maintenance costs are kept as low as possible. 
D)  maintain the capability of the system. 
E)  ensure that maintenance employees are fully utilized. 
A)  ensure that breakdowns do not affect the quality of the products. 
B)  ensure that no breakdowns will ever occur. 
C)  ensure that preventive maintenance costs are kept as low as possible. 
D)  maintain the capability of the system. 
E)  ensure that maintenance employees are fully utilized. D

Question 4

________ is the probability that a machine part or product will function properly for a specified time under stated conditions.

Accepted Answer

The answer of ________ is the probability that a machine...

Question 5

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

Accepted Answer

FR(N) is the product failure n

Question 6

Failures are tolerable as long as their results are not catastrophic.

Accepted Answer

A) True 
 B)False

Question 7

What is the role of people, especially empowered employees, in an effective maintenance strategy?

Accepted Answer

The interdependency of operator, machine

Question 8

Suppose that a three stage process had reliability ratings of .7, .8, and .9 at each station and that a failure at any station represented a failure for the entire process. If each station is given a redundant check with .9 reliability, what is the increase in system reliability?

Accepted Answer

Old- .7 ∗ .8 ∗ .9 = .504
New (

Question 9

Which of the following is a reliability tactic?

Accepted Answer

A)  improving individual components 
B)  increasing repair speed 
C)  providing redundancy 
D)  A and C 
E)  A, B, and C 
A)  improving individual components 
B)  increasing repair speed 
C)  providing redundancy 
D)  A and C 
E)  A, B, and C

Question 10

Which of the following increase as repairs move from the maintenance department to the depot service?

Accepted Answer

A)  cost 
B)  replacement time 
C)  quality 
D)  employee ownership 
E)  A, B, and C 
A)  cost 
B)  replacement time 
C)  quality 
D)  employee ownership 
E)  A, B, and C

Question 11

A product has three components X, Y, and Z. X has reliability of 0.991; Y has reliability of 0.993. If Z has reliability of 0.991, what is the reliability of the entire product? Can Z be redesigned to be reliable enough for the entire product to have reliability of 0.99? Explain.

Accepted Answer

The product has reliability 0.

Question 12

The reliability of a system in which each individual component must function in order for the entire system to function, and in which each component has its own unique reliability, independent of other components, is the product of the probabilities of each of those components.

Accepted Answer

A) True 
 B)False

Question 13

Suppose that a car mechanic offers you a deal that for the next 3 years any breakdowns will be covered, so long as you bring your car in for $50 preventative maintenance sessions each month. If you predict the likelihood of a breakdown being 25% without the maintenance, how much must a breakdown cost for you to prefer the preventative maintenance?

Accepted Answer

36 months ∗ $50/mont

Question 14

Under what conditions is preventive maintenance likely to be appropriate?

Accepted Answer

Preventive maintenance is appropriate wh

Question 15

A system consists of seven components in series. The reliability of each component is 0.975. What is the reliability of the system?

Accepted Answer

The reliability of t

Question 16

A manufacturing firm wants to apply 6-sigma standards to its automated tolerance-check process. Suppose that each scanner makes the correct decision only 50% of the time, however only 1 correct decision by any scanner makes the entire process a success. How many scanners are needed to ensure 6-sigma quality?

Accepted Answer

3.4/100000

Question 17

TPM (total productive maintenance) is an application of TQM (total quality management) principles to the area of maintenance.

Accepted Answer

A) True 
 B)False

Question 18

For a machine to be a good candidate for preventive maintenance

Accepted Answer

A)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF distribution must have a large standard deviation. 
B)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF must be relatively low. 
C)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF distribution must have a relatively low standard deviation. 
D)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF must be relatively high. 
E)  the consequences of failure must be relatively unknown and, therefore, risky. 
A)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF distribution must have a large standard deviation. 
B)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF must be relatively low. 
C)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF distribution must have a relatively low standard deviation. 
D)  the consequences of failure must exceed the cost of preventive maintenance and the MTBF must be relatively high. 
E)  the consequences of failure must be relatively unknown and, therefore, risky.

Question 19

Ten high-intensity bulbs are tested for 100 hours each. One failed at 40 hours; another failed at 70 hours; all others completed the test. Calculate FR(%), FR(N), and MTBF.

Accepted Answer

FR(%) = 2/10 or 20%;

Question 20

Explain carefully how redundancy improves product reliability.

Accepted Answer

A redundant part or component is connect

Exam 17: Maintenance and Reliability

Infant mortality refers to the high failure rate often encountered in the very early stages of the lifetime of a product.

The objective of maintenance and reliability is to

________ is the probability that a machine part or product will function properly for a specified time under stated conditions.

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

Failures are tolerable as long as their results are not catastrophic.

What is the role of people, especially empowered employees, in an effective maintenance strategy?

Suppose that a three stage process had reliability ratings of .7, .8, and .9 at each station and that a failure at any station represented a failure for the entire process. If each station is given a redundant check with .9 reliability, what is the increase in system reliability?

Which of the following is a reliability tactic?

Which of the following increase as repairs move from the maintenance department to the depot service?

A product has three components X, Y, and Z. X has reliability of 0.991; Y has reliability of 0.993. If Z has reliability of 0.991, what is the reliability of the entire product? Can Z be redesigned to be reliable enough for the entire product to have reliability of 0.99? Explain.

The reliability of a system in which each individual component must function in order for the entire system to function, and in which each component has its own unique reliability, independent of other components, is the product of the probabilities of each of those components.

Under what conditions is preventive maintenance likely to be appropriate?

A system consists of seven components in series. The reliability of each component is 0.975. What is the reliability of the system?

TPM (total productive maintenance) is an application of TQM (total quality management) principles to the area of maintenance.

For a machine to be a good candidate for preventive maintenance

Ten high-intensity bulbs are tested for 100 hours each. One failed at 40 hours; another failed at 70 hours; all others completed the test. Calculate FR(%), FR(N), and MTBF.

Explain carefully how redundancy improves product reliability.

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