Question 1

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

Accepted Answer

The interdependency of operator, machine

Question 2

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

Accepted Answer

Preventive

Question 3

A system has four components in a series. What is the reliability of the system?
 $\begin{array}{|l|c|c|c|c|}
\hline \text { Component } & 1 & 2 & 3 & 4 \
\hline \text { Reliability } & .90 & .95 & .90 & .99 \
\hline
\end{array}$

Accepted Answer

0.90 * 0.9

Question 4

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 5

A product has four components A, B, C, and D. The finished product must have a reliability of .95. The first three components come from a supplier, and have reliabilities of .99, .98, and .995. 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

Question 6

A system has three components in series with reliabilities 0.9, 0.7, and 0.5. System reliability is

Accepted Answer

A)  0.315 
B)  0.500 
C)  0.700 
D)  0.900 
E)  2.100 
A)  0.315 
B)  0.500 
C)  0.700 
D)  0.900 
E)  2.100

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.
 $$\begin{array} { | l | l | l | l | l | l | l | } 
\hline \text { Number of breakdowns } & 0 & 1 & 2 & 3 & 4 & 5 \
\hline \text { Breakdown frequency } & 2 & 2 & 2 & 6 & 7 & 1 \
\hline
\end{array}$$ 
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 * .

Question 8

__________ 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 9

Suppose that a process is comprised of multiple components, each having a 75% success rate. What is the change in reliability going from a series layout to a parallel layout if the process has 5 components?

Accepted Answer

A)  0% 
B)  100% 
C)  76.2% 
D)  -76.2 % 
E)  unable to determine 
A)  0% 
B)  100% 
C)  76.2% 
D)  -76.2 % 
E)  unable to determine

Question 10

Which of the following is true regarding total productive maintenance (TPM)?

Accepted Answer

A)  TPM is concerned with machine operation, not machine design. 
B)  Field service and depot service perform virtually all maintenance and repair activities. 
C)  Operators run their machines, but maintenance departments maintain them. 
D)  TPM reduces variability through employee empowerment and excellent maintenance practices. 
E)  TPM views maintenance and repair as tactical issues, not strategic ones. 
A)  TPM is concerned with machine operation, not machine design. 
B)  Field service and depot service perform virtually all maintenance and repair activities. 
C)  Operators run their machines, but maintenance departments maintain them. 
D)  TPM reduces variability through employee empowerment and excellent maintenance practices. 
E)  TPM views maintenance and repair as tactical issues, not strategic ones.

Question 11

The MTBF distribution of a machine that has passed the phase of early failures exhibits a normal distribution. The smaller the standard deviation of this distribution

Accepted Answer

A)  the more expensive is preventive maintenance 
B)  the more likely this machine is a candidate for preventive maintenance 
C)  the shorter is the time interval between breakdowns 
D)  the more likely this machine will break down 
E)  the more likely this machine will be maintained by a breakdown maintenance policy 
A)  the more expensive is preventive maintenance 
B)  the more likely this machine is a candidate for preventive maintenance 
C)  the shorter is the time interval between breakdowns 
D)  the more likely this machine will break down 
E)  the more likely this machine will be maintained by a breakdown maintenance policy

Question 12

Which of the following statements about maintenance at Orlando Utilities Commission is False?

Accepted Answer

A)  There are at least two types of preventive maintenance, including an annual maintenance and a less frequent overhaul schedule. 
B)  Its preventive maintenance program has earned the company top rankings and its competitive advantage. 
C)  Each power-generating unit is taken off-line every three years for a complete overhaul. 
D)  Each of its power-generating units is taken off-line for maintenance every one to three weeks. 
E)  Costs associated with breakdowns are several times higher than costs arising from preventive maintenance. 
A)  There are at least two types of preventive maintenance, including an annual maintenance and a less frequent overhaul schedule. 
B)  Its preventive maintenance program has earned the company top rankings and its competitive advantage. 
C)  Each power-generating unit is taken off-line every three years for a complete overhaul. 
D)  Each of its power-generating units is taken off-line for maintenance every one to three weeks. 
E)  Costs associated with breakdowns are several times higher than costs arising from preventive maintenance.

Question 13

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 rel

Question 14

Consider a product with three components in series, with reliabilities of 0.90, 0.80, and 0.99 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)  0.80000 
D)  0.85536 
E)  3.49000 
A)  0.50000 
B)  0.71280 
C)  0.80000 
D)  0.85536 
E)  3.49000

Question 15

A system has six components in series. Each component has a reliability of 0.99. What is the reliability of the system?

Accepted Answer

The answer of A system has six components in series....

Question 16

When identifying the optimal maintenance policy, the cost of inventory maintained to compensate for the downtime is a cost often ignored.

Accepted Answer

A) True 
 B)False

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 which accompany these services are 95%, 90%, 99%, 98%, and 99%, what is the "reliability" of the entire product from the student's perspective-the probability that all five will work according to plan?

Accepted Answer

Reliability is .95 *

Question 18

Suppose that the introduction of a preventive maintenance program is deemed cost effective. Which of the following is most likely true if the cost to actually perform preventive maintenance is very expensive?

Accepted Answer

A)  high standard deviation in MTBF 
B)  low standard deviation in MTBF 
C)  low Cost to Repair 
D)  repairs carry little non-monetary consequences 
E)  the system never fails 
A)  high standard deviation in MTBF 
B)  low standard deviation in MTBF 
C)  low Cost to Repair 
D)  repairs carry little non-monetary consequences 
E)  the system never fails

Question 19

How is MTBF related to FR(N)?

Accepted Answer

A)  MTBF is measured in hours, while FR(N) is measured in years. 
B)  MTBF is normally distributed, with FR(%) as its mean and FR(N) as its standard deviation. 
C)  MTBF is the reciprocal of FR(N). 
D)  Both MTBF and FR(N) increase when breakdown maintenance is replaced by preventive maintenance. 
E)  MTBF and FR(N) are unrelated concepts. 
A)  MTBF is measured in hours, while FR(N) is measured in years. 
B)  MTBF is normally distributed, with FR(%) as its mean and FR(N) as its standard deviation. 
C)  MTBF is the reciprocal of FR(N). 
D)  Both MTBF and FR(N) increase when breakdown maintenance is replaced by preventive maintenance. 
E)  MTBF and FR(N) are unrelated concepts.

Question 20

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)  under 0.83 
B)  0.90 
C)  0.955 
D)  no less than .99 
E)  none of the above 
A)  under 0.83 
B)  0.90 
C)  0.955 
D)  no less than .99 
E)  none of the above

Exam 20: Maintenance and Reliability

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

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

A system has four components in a series. What is the reliability of the system? Component 1 2 3 4 Reliability .90 .95 .90 .99

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.

A system has three components in series with reliabilities 0.9, 0.7, and 0.5. System reliability is

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

Suppose that a process is comprised of multiple components, each having a 75% success rate. What is the change in reliability going from a series layout to a parallel layout if the process has 5 components?

Which of the following is true regarding total productive maintenance (TPM)?

The MTBF distribution of a machine that has passed the phase of early failures exhibits a normal distribution. The smaller the standard deviation of this distribution

Which of the following statements about maintenance at Orlando Utilities Commission is False?

Consider a product with three components in series, with reliabilities of 0.90, 0.80, and 0.99 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?

A system has six components in series. Each component has a reliability of 0.99. What is the reliability of the system?

When identifying the optimal maintenance policy, the cost of inventory maintained to compensate for the downtime is a cost often ignored.

Suppose that the introduction of a preventive maintenance program is deemed cost effective. Which of the following is most likely true if the cost to actually perform preventive maintenance is very expensive?

How is MTBF related to FR(N)?

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

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