Question 1

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 2

A redundant part decreases reliability if the reliability of the redundant part is lower than that of the part it is backing up.

Accepted Answer

A) True 
 B)False

Question 3

The Orlando Utilities Commission uses a computerized maintenance management program and devotes significant dollar and labor resources to power plant maintenance, because the costs of unexpected failure are incredibly high.

Accepted Answer

A) True 
 B)False

Question 4

"High reliability can be achieved in a product without having high reliability in the component parts. In fact, any reliability target, no matter how high, can be achieved with only mediocre parts, so long as enough of them are present." Discuss; an example may help.

Accepted Answer

This carries the redundancy concept one

Question 5

What is the reliability of the three components connected in series shown below?

Accepted Answer

A)  0.799425 
B)  0.85000 
C)  0.91333 
D)  0.95000 
E)  2.79 
A)  0.799425 
B)  0.85000 
C)  0.91333 
D)  0.95000 
E)  2.79

Question 6

Preventive maintenance is nothing more than keeping the equipment and machinery running.

Accepted Answer

A) True 
 B)False

Question 7

Tiger Island Fabricators, which builds offshore oil platforms, has been experiencing problems with its profiling machine, a computer-driven device that cuts the ends of pipe so that it can be welded to another pipe, as shown in the data below.
   Each time a machine breaks down, the company loses about $3,000. If the company implements preventive maintenance, it will be able to reduce the number of breakdowns to one per month. Preventive maintenance costs would be $500 a month. Is preventive maintenance a cost-effective option?

Accepted Answer

@#IMG-DLM& Expected number of breakdowns = (0)(.10

Question 8

Which one of the following statements about maintenance is TRUE?

Accepted Answer

A)  The optimal degree of preventive maintenance is associated with zero breakdowns. 
B)  Breakdown maintenance is proactive. 
C)  Preventive maintenance is reactive. 
D)  Preventive maintenance is for emergency repairs. 
E)  Human resources are a major component of effective maintenance management. 
A)  The optimal degree of preventive maintenance is associated with zero breakdowns. 
B)  Breakdown maintenance is proactive. 
C)  Preventive maintenance is reactive. 
D)  Preventive maintenance is for emergency repairs. 
E)  Human resources are a major component of effective maintenance management.

Question 9

What is the probability that a product will function properly for a specified time under stated conditions?

Accepted Answer

A)  functionality 
B)  maintenance 
C)  durability 
D)  reliability 
E)  fitness for use 
A)  functionality 
B)  maintenance 
C)  durability 
D)  reliability 
E)  fitness for use

Question 10

Suppose that a process is comprised of five components, each having an 85% success rate. By how much would reliability change if the process switched from having the components in parallel to having the components in series?

Accepted Answer

A)  no change 
B)  100% increase 
C)  55.6% increase 
D)  55.6% decrease 
E)  36.3% decrease 
A)  no change 
B)  100% increase 
C)  55.6% increase 
D)  55.6% decrease 
E)  36.3% decrease

Question 11

The product failure rate FR(%) is the percent of failures among the total number of products tested.

Accepted Answer

A) True 
 B)False

Question 12

Consider a product with three components in series, with reliabilities of 0.90, 0.80, and 0.89 for components A, B, and C, respectively. Furthermore, component B uses a backup that also has a reliability of 0.80. What is the reliability of the system?

Accepted Answer

A)  0.50000 
B)  0.71280 
C)  0.76896 
D)  0.85536 
E)  3.49000 
A)  0.50000 
B)  0.71280 
C)  0.76896 
D)  0.85536 
E)  3.49000

Question 13

Explain why a small standard deviation of the MTBF distribution makes a product, machine, or process a good candidate for preventive maintenance while a large standard deviation does not.

Accepted Answer

A small standard deviation means that th

Question 14

Electronic sensors have proven so effective that preventive maintenance is no longer necessary.

Accepted Answer

A) True 
 B)False

Question 15

The "full cost view of maintenance" results in more firms choosing a policy of breakdown maintenance, when compared to the "traditional view of maintenance."

Accepted Answer

A) True 
 B)False

Question 16

Infant mortality refers to which one of the following examples?

Accepted Answer

A)  high frequency on the left side of the MTBF distribution 
B)  failure of items used in the nursery ward of a hospital 
C)  failure of products with a very short life cycle 
D)  market failure of brand new products 
E)  high failure rate often encountered in the early stages of the lifetime of a product 
A)  high frequency on the left side of the MTBF distribution 
B)  failure of items used in the nursery ward of a hospital 
C)  failure of products with a very short life cycle 
D)  market failure of brand new products 
E)  high failure rate often encountered in the early stages of the lifetime of a product

Question 17

A system consists of four components in series. The reliability of each component is 0.96. What is the reliability of the system?

Accepted Answer

The reliability of t

Question 18

A component must have reliability of .999. Two technologies are available for this component: one produces a component with .999 reliability at a cost of $3000. Another produces a component with .75 reliability at a cost of $500. Which is cheaper: one high quality component or a parallel set of inferior components?

Accepted Answer

First, determine how many of the 0.75 re

Question 19

A system has three components in series with reliabilities 0.9, 0.7, and 0.8. What is the system reliability?

Accepted Answer

A)  0.315 
B)  0.500 
C)  0.800 
D)  0.504 
E)  2.400 
A)  0.315 
B)  0.500 
C)  0.800 
D)  0.504 
E)  2.400

Question 20

A redundant part or component increases reliability because it is connected in parallel, not in series.

Accepted Answer

A) True 
 B)False

Exam 16: Maintenance and Reliability

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?

A redundant part decreases reliability if the reliability of the redundant part is lower than that of the part it is backing up.

The Orlando Utilities Commission uses a computerized maintenance management program and devotes significant dollar and labor resources to power plant maintenance, because the costs of unexpected failure are incredibly high.

"High reliability can be achieved in a product without having high reliability in the component parts. In fact, any reliability target, no matter how high, can be achieved with only mediocre parts, so long as enough of them are present." Discuss; an example may help.

What is the reliability of the three components connected in series shown below?

Preventive maintenance is nothing more than keeping the equipment and machinery running.

Which one of the following statements about maintenance is TRUE?

What is the probability that a product will function properly for a specified time under stated conditions?

Suppose that a process is comprised of five components, each having an 85% success rate. By how much would reliability change if the process switched from having the components in parallel to having the components in series?

The product failure rate FR(%) is the percent of failures among the total number of products tested.

Consider a product with three components in series, with reliabilities of 0.90, 0.80, and 0.89 for components A, B, and C, respectively. Furthermore, component B uses a backup that also has a reliability of 0.80. What is the reliability of the system?

Explain why a small standard deviation of the MTBF distribution makes a product, machine, or process a good candidate for preventive maintenance while a large standard deviation does not.

Electronic sensors have proven so effective that preventive maintenance is no longer necessary.

The "full cost view of maintenance" results in more firms choosing a policy of breakdown maintenance, when compared to the "traditional view of maintenance."

Infant mortality refers to which one of the following examples?

A system consists of four components in series. The reliability of each component is 0.96. What is the reliability of the system?

A system has three components in series with reliabilities 0.9, 0.7, and 0.8. What is the system reliability?

A redundant part or component increases reliability because it is connected in parallel, not in series.

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