Question 1

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 2

Given the following data,find the expected breakdown cost.The cost per breakdown is $100.

Accepted Answer

@#IMG-DLM& Expected number of breakdowns

Question 3

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 4

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 5

What is the process that involves repair on an emergency or priority basis?

Accepted Answer

A) breakdown maintenance 
B) emergency maintenance 
C) failure maintenance 
D) preventive maintenance 
E) priority maintenance 
A) breakdown maintenance 
B) emergency maintenance 
C) failure maintenance 
D) preventive maintenance 
E) priority maintenance

Question 6

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.

Question 7

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

Question 8

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 9

A system is composed of four parts,J,K,L,and M.All four must function for the system to function.The four component reliabilities are .99,.98,.992,and .998.The designers are considering putting an 80% reliable backup at K.This backup will change the system reliability from ________ to ________.

Accepted Answer

A) 0.9762;0.9605 
B) 0.9605;0.9762 
C) 0.9605;some smaller value 
D) 0.9605;0.996 
E) 0.98;0.99 
A) 0.9762;0.9605 
B) 0.9605;0.9762 
C) 0.9605;some smaller value 
D) 0.9605;0.996 
E) 0.98;0.99

Question 10

________ 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 11

Century Digital Phone advertises phone battery life (on standby)of up to three days.The standard deviation is thought to be five hours.Tina Talbot,an employee at CDP,tested 10 of these batteries for 72 hours.One failed at 40 hours;one failed at 62 hours;one failed at 70 hours.All others completed the test.Calculate FR(%),FR(N),and MTBF.

Accepted Answer

FR(%)= 3/10 or 30%.F

Question 12

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 13

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 14

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 15

An oil change is to ________ maintenance as repair of a broken alternator is to ________ maintenance.

Accepted Answer

A) preventive;breakdown 
B) breakdown;preventive 
C) preventive;preventive 
D) breakdown;breakdown 
E) preventive;infant mortality 
A) preventive;breakdown 
B) breakdown;preventive 
C) preventive;preventive 
D) breakdown;breakdown 
E) preventive;infant mortality

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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 18

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 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

Great Southern Consultants Group's computer system has been down several times over the past few months,as shown below.
   Each time the system is down,the firm loses an average of $400 in time and service expenses.They are considering signing a contract for preventive maintenance.With preventive maintenance,the system would be down on average only 0.5 per month.The monthly cost of preventive maintenance would be $200 a month.Which is cheaper,breakdown or preventive maintenance?

Accepted Answer

@#IMG-DLM& Expected # of breakdowns per month = (0

Exam 17: Maintenance and Reliability

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

Given the following data,find the expected breakdown cost.The cost per breakdown is $100.

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

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

What is the process that involves repair on an emergency or priority basis?

As a firm's maintenance commitment increases:

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

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.

A system is composed of four parts,J,K,L,and M.All four must function for the system to function.The four component reliabilities are .99,.98,.992,and .998.The designers are considering putting an 80% reliable backup at K.This backup will change the system reliability from ________ to ________.

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

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?

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

How is MTBF related to FR(N)?

An oil change is to ________ maintenance as repair of a broken alternator is to ________ maintenance.

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

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

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"?

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A system is composed of four parts,J,K,L,and M.All four must function for the system to function.The four component reliabilities are .99,.98,.992,and .998.The designers are considering putting an 80% reliable backup at K.This backup will change the system reliability from to .

An oil change is to maintenance as repair of a broken alternator is to maintenance.