Question 1

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

Accepted Answer

This is known as the "reliability equation" and is a widely accepted principle in engineering and design. The more components or parts that make up a product, the more likely it is that one of them will fail, thus reducing overall reliability.

Question 2

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

Accepted Answer

This is the correct definition of product failure rate.

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

What is the probability that a product will function properly for a specified time under stated conditions?
A)functionality
B)maintenance
C)durability
D)reliability
E)fitness for use

Accepted Answer

The probability that a product will function properly for a specified time under stated conditions is known as reliability. It refers to a product's ability to perform its intended function without failure or breakdown for a given period. Thus, option D, reliability, is the best choice.

Question 5

________ 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 6

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

Accepted Answer

Given Mean Time Between Failures (MTBF) = 2,000 hours
FR(N) = 1 / MTBF = 1 / 2,000 = 0.0005 failures/unit-hour. Therefore, the statement is true.

Question 7

Which of the following is a reliability tactic?
A)improving individual components
B)increasing repair speed
C)providing redundancy
D)A and C
E)A,B,and C

Accepted Answer

Improving individual components and providing redundancy are both reliability tactics. Increasing repair speed may help reduce downtime, but it is not necessarily a reliability tactic in and of itself. Therefore, the best choice is D, which includes both improving individual components and providing redundancy as reliability tactics.

Question 8

The reliability of a system in which each individual component must function in order for the entire system to function,and in which each component has its own unique reliability,independent of other components,is the product of the probabilities of each of those components.

Accepted Answer

This is known as the "product rule" in reliability engineering, where the overall reliability of a system is calculated as the product of the reliability of each individual component.

Question 9

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

Accepted Answer

The statement that each of its power-generating units is taken off-line for maintenance every one to three weeks is false. This frequency of maintenance would greatly disrupt power generation and is not practical.

Question 10

The objective of maintenance and reliability is to maintain the capability of the system.

Accepted Answer

The objective of maintenance and reliability is to maintain the capability of the system, whether it is equipment or processes, to perform their intended function at a desired level of performance.

Question 11

Reliability is the probability that a machine part or product will function properly for a specified time regardless of conditions.

Accepted Answer

Reliability is the probability that a machine part or product will function properly for a specified time under stated conditions, not regardless of conditions. Conditions such as operating environment, maintenance, and usage intensity significantly affect reliability.

Question 12

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

Accepted Answer

The answer of The MTBF (mean time between failures)is calculated...

Question 13

Identify the two reliability tactics and the two maintenance tactics.

Accepted Answer

The answer of Identify the two reliability tactics and the...

Question 14

The objective of maintenance and reliability is to:
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.

Accepted Answer

The objective of maintenance and reliability is not to completely prevent breakdowns, as that is often not possible. Instead, it is to maintain the capability of the system by minimizing downtime and maximizing efficiency. This requires a balance between preventive maintenance and reactive maintenance. Keeping preventive maintenance costs low is important, but not the primary objective. Similarly, ensuring that maintenance workers are fully utilized may be a consideration, but should not be the ultimate goal.

Question 15

________ 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 16

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

The sentence states that the Orlando Utilities Commission uses a computerized maintenance management program and dedicates significant funds and labor to power plant maintenance to avoid the high costs of unexpected failure, indicating that the statement is true.

Question 17

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

Accepted Answer

When a redundant part or component is connected in parallel, it provides an alternative path for current or signals to flow, reducing the risk of a single point of failure. In contrast, components connected in series can increase reliability by reducing the risk of malfunctions due to individual failures, but the failure of any one component in the series can cause the entire system to fail.

Question 18

Define maintenance.

Accepted Answer

The answer of Define maintenance....

Question 19

Define reliability.

Accepted Answer

The answer of Define reliability....

Question 20

Maintenance includes all activities involved in keeping a system's equipment in working order.

Accepted Answer

Maintenance involves preventive and corrective actions to ensure that a system's equipment is functioning properly and efficiently. This includes tasks such as inspections, repairs, replacements, and cleaning.

Quiz 17: Maintenance and Reliability