Question 1

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 2

The inverse of the mean time between failures is the __________.

Accepted Answer

number of failures d

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

Question 4

When depot service is compared to operator maintenance,

Accepted Answer

A)  operator maintenance is slower than depot service 
B)  competence is higher, but costs may also be higher, with depot service 
C)  depot service is often the weak link in the chain because of the lack of specific training 
D)  depot service occurs on-site, while operator maintenance occurs off-site 
E)  depot service is better for systems connected in parallel, while operator maintenance is preferred for systems connected in series 
A)  operator maintenance is slower than depot service 
B)  competence is higher, but costs may also be higher, with depot service 
C)  depot service is often the weak link in the chain because of the lack of specific training 
D)  depot service occurs on-site, while operator maintenance occurs off-site 
E)  depot service is better for systems connected in parallel, while operator maintenance is preferred for systems connected in series

Question 5

Given the following data, find the expected breakdown cost. The cost per breakdown is $100.
 $$\begin{array} { | l | c | c | c | c | } 
\hline \text { Number of breakdowns } & 0 & 1 & 2 & 3 \
\hline \text { Monthly frequency } & 5 & 20 & 23 & 2 \
\hline
\end{array}$$

Accepted Answer

@#IMG-DLM& 
Expected number of breakdown

Question 6

Recording the maintenance history of processes, machines, or equipment is important for preventive maintenance, but largely irrelevant for breakdown maintenance.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

A system is composed of three components A, B, and C. All three must function for the system to function. There are currently no backups in place. The system has a reliability of 0.966. If a backup is installed for component A, the new system reliability will be

Accepted Answer

A)  unchanged 
B)  less than 0.966 
C)  greater than it would be if a backup were also installed for component B 
D)  greater than 0.966 
E)  none of the above 
A)  unchanged 
B)  less than 0.966 
C)  greater than it would be if a backup were also installed for component B 
D)  greater than 0.966 
E)  none of the above

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

The MTBF (mean time between failures) is calculated as the reciprocal of the number of failures during a period of time.

Accepted Answer

A) True 
 B)False

Question 11

MTBF measures the average

Accepted Answer

A)  calendar time between failures 
B)  operating time between failures 
C)  number of failures per unit time 
D)  number of operations between failures 
E)  downtime per breakdown 
A)  calendar time between failures 
B)  operating time between failures 
C)  number of failures per unit time 
D)  number of operations between failures 
E)  downtime per breakdown

Question 12

Define maintenance.

Accepted Answer

Maintenance is all a

Question 13

As far as maintenance costs are concerned,

Accepted Answer

A)  for low levels of maintenance commitment, breakdown maintenance costs exceed preventive maintenance costs 
B)  for low levels of maintenance commitment, preventive maintenance costs exceed breakdown maintenance costs 
C)  for high levels of maintenance commitment, breakdown maintenance costs exceed preventive maintenance costs 
D)  preventive maintenance is always more economical than breakdown maintenance 
E)  Breakdown maintenance is always more economical than preventive maintenance when the "full cost of breakdowns" is taken into consideration. 
A)  for low levels of maintenance commitment, breakdown maintenance costs exceed preventive maintenance costs 
B)  for low levels of maintenance commitment, preventive maintenance costs exceed breakdown maintenance costs 
C)  for high levels of maintenance commitment, breakdown maintenance costs exceed preventive maintenance costs 
D)  preventive maintenance is always more economical than breakdown maintenance 
E)  Breakdown maintenance is always more economical than preventive maintenance when the "full cost of breakdowns" is taken into consideration.

Question 14

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 15

A product has three components, A, B, and C, with reliabilities of 0.95, 0.98, and 0.995. Engineers intend to put a redundant component A that has reliability 0.70. With this change, system reliability will

Accepted Answer

A)  fall by 20% 
B)  fall by 10% or less 
C)  rise 
D)  cannot determine from the information provided 
E)  none of the above 
A)  fall by 20% 
B)  fall by 10% or less 
C)  rise 
D)  cannot determine from the information provided 
E)  none of the above

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 very 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 very early stages of the lifetime of a product

Question 17

Techniques for enhancing maintenance can include

Accepted Answer

A)  simulation of breakdowns from prolonged use 
B)  expert systems that aid in problem-solving 
C)  automated sensors that warn when preventative maintenance is required 
D)  A and C 
E)  A, B, and C 
A)  simulation of breakdowns from prolonged use 
B)  expert systems that aid in problem-solving 
C)  automated sensors that warn when preventative maintenance is required 
D)  A and C 
E)  A, B, and C

Question 18

Infant mortality in electronics follows which kind of distribution?

Accepted Answer

A)  normal 
B)  negative exponential 
C)  exponential 
D)  random 
E)  one-sided normal distribution 
A)  normal 
B)  negative exponential 
C)  exponential 
D)  random 
E)  one-sided normal distribution

Question 19

The diagram below identifies the elements of service as provided by a soft drink vending machine. Each element has an estimate of its own reliability, independent of the others. What is the reliability of the "system"?

Accepted Answer

Reliability = .85 *

Question 20

The __________ takes into account such costs as deteriorated customer relations and lost sales.

Accepted Answer

full cost

Exam 20: Maintenance and Reliability

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

The inverse of the mean time between failures is the __________.

The objective of maintenance and reliability is to

When depot service is compared to operator maintenance,

Given the following data, find the expected breakdown cost. The cost per breakdown is $100. Number of breakdowns 0 1 2 3 Monthly frequency 5 20 23 2

Recording the maintenance history of processes, machines, or equipment is important for preventive maintenance, but largely irrelevant for breakdown maintenance.

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

A system is composed of three components A, B, and C. All three must function for the system to function. There are currently no backups in place. The system has a reliability of 0.966. If a backup is installed for component A, the new system reliability will be

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

The MTBF (mean time between failures) is calculated as the reciprocal of the number of failures during a period of time.

MTBF measures the average

Define maintenance.

As far as maintenance costs are concerned,

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.

A product has three components, A, B, and C, with reliabilities of 0.95, 0.98, and 0.995. Engineers intend to put a redundant component A that has reliability 0.70. With this change, system reliability will

Infant mortality refers to which one of the following examples?

Techniques for enhancing maintenance can include

Infant mortality in electronics follows which kind of distribution?

The diagram below identifies the elements of service as provided by a soft drink vending machine. Each element has an estimate of its own reliability, independent of the others. What is the reliability of the "system"?

The __________ takes into account such costs as deteriorated customer relations and lost sales.

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Statistical Process Control

Process Strategy

Capacity and Constraint Management

Location Strategies

Layout Strategies

Human Resources, Job Design, and Work Measurement

Supply-Chain Management

Outsourcing as a Supply-Chain Strategy

Inventory Management

Aggregate Planning

Material Requirements Planning MRP and ERP

Short-Term Scheduling

Just-In-Time and Lean Options

Decision-Making Tools

Linear Programming

Transportation Models

Waiting-Line Models

Learning Curves

Simulation

Filters