Question 1

Preventive maintenance implies that machine sensors to detect variations from normal are inadequate.

Accepted Answer

A) True 
 B)False  False

Question 2

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 D

Question 3

Describe how the Orlando Utilities Commission obtains competitive advantage through its maintenance practices.

Accepted Answer

The company recognizes the importance of preventive maintenance to the business it is in;this is driven in part by the very large cost of forced power outages.Their maintenance plan involves annual checkups for each plant and complete overhauls every three years.The firm has well-developed and highly detailed preventive maintenance procedures.Maintenance work orders are computerized for efficiency.

Question 4

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

Accepted Answer

A) cost 
B) replacement time 
C) competence 
D) operator ownership 
E) A,B,and C 
A) cost 
B) replacement time 
C) competence 
D) operator ownership 
E) A,B,and C

Question 5

DuLarge Marine manufactures diesel engines for shrimp trawlers and other small commercial boats.One of their CNC machines has caused several problems.Over the past 30 weeks,the machine has broken down as indicated below.Each time the machine breaks down,the firm loses an average of $3,000 in time and repair expenses.   What is the expected breakdown cost per week?

Accepted Answer

A) $1,000 
B) $2,000 
C) $6,000 
D) $10,000 
E) $60,000 
A) $1,000 
B) $2,000 
C) $6,000 
D) $10,000 
E) $60,000

Question 6

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 7

Ten high-technology batteries are tested for 200 hours each.One failed at 20 hours;all others completed the test.FR(%)is ________ and MTBF is ________.

Accepted Answer

A) 10%;1/1820 
B) 90%;1/1820 
C) 10%;1820 hours 
D) 10%;1980 hours 
E) 10%;2000 hours 
A) 10%;1/1820 
B) 90%;1/1820 
C) 10%;1820 hours 
D) 10%;1980 hours 
E) 10%;2000 hours

Question 8

A simple electrical motor has three components: windings,armature,and housing.These three components have reliabilities of .9998,.9992,and .9999.There is no possibility of redundant parts.What is the reliability of the motor? Round your answer to four decimal places.

Accepted Answer

(0.9998)(0

Question 9

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 10

If the mean time between failures has been calculated to be 2,000 hours,then FR(N)= 0.0005 failures/unit-hour.

Accepted Answer

A) True 
 B)False

Question 11

What is breakdown maintenance?

Accepted Answer

Breakdown maintenance is the r

Question 12

Define reliability.

Accepted Answer

Reliability is the probability

Question 13

Define maintenance.

Accepted Answer

Maintenance is all a

Question 14

Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure.

Accepted Answer

A) True 
 B)False

Question 15

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 nonmonetary 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 nonmonetary consequences. 
E) The system never fails.

Question 16

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) 0.8295 
B) 0.90 
C) 0.955 
D) 0.99 
E) 0.945 
A) 0.8295 
B) 0.90 
C) 0.955 
D) 0.99 
E) 0.945

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

The MTBF distributions of products,machines,or processes that have "settled in," or gone beyond the infant mortality phase,often follow the normal distribution.

Accepted Answer

A) True 
 B)False

Question 19

Small standard deviations in the MTBF distribution of a machine tend to support a policy of breakdown maintenance for that machine.

Accepted Answer

A) True 
 B)False

Question 20

While breakdowns occur randomly,their frequency is somewhat predictable through such tools as the product failure rate,MTBF,and the breakdown costs model.

Accepted Answer

A) True 
 B)False

Exam 17: Maintenance and Reliability

Preventive maintenance implies that machine sensors to detect variations from normal are inadequate.

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

Describe how the Orlando Utilities Commission obtains competitive advantage through its maintenance practices.

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

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?

Ten high-technology batteries are tested for 200 hours each.One failed at 20 hours;all others completed the test.FR(%)is ________ and MTBF is ________.

A simple electrical motor has three components: windings,armature,and housing.These three components have reliabilities of .9998,.9992,and .9999.There is no possibility of redundant parts.What is the reliability of the motor? Round your answer to four decimal places.

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?

If the mean time between failures has been calculated to be 2,000 hours,then FR(N)= 0.0005 failures/unit-hour.

What is breakdown maintenance?

Define reliability.

Define maintenance.

Adding an additional part to a component or product ordinarily reduces reliability by introducing an additional source of failure.

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?

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

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

The MTBF distributions of products,machines,or processes that have "settled in," or gone beyond the infant mortality phase,often follow the normal distribution.

Small standard deviations in the MTBF distribution of a machine tend to support a policy of breakdown maintenance for that machine.

While breakdowns occur randomly,their frequency is somewhat predictable through such tools as the product failure rate,MTBF,and the breakdown costs model.

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Ten high-technology batteries are tested for 200 hours each.One failed at 20 hours;all others completed the test.FR(%)is and MTBF is .