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NEW QUESTION 153
A fault tree analysis (FTA) is a design analysis technique constructed from a "top event". A basic problem with this technique in comparison to a FMECA would be which of the following?
Response:
- A. Only electronic systems can be analyzed.
- B. Assigning probabilities to the various events.
- C. Needing a different FTA for each defined top event.
- D. Understanding logical symbols.
Answer: C
NEW QUESTION 154
When a defense is prepared for a product liability action, all of the following would be considered elements of the assumption of risk the plaintiff must have EXCEPT:
Response:
- A. Understood the consequence of the risk.
- B. Had knowledge of the risk
- C. Contributed to the injury through negligence.
- D. Voluntarily undertaken the risk.
Answer: C
NEW QUESTION 155
Which of these terms is commonly used as the probability of rejecting material produced at an unacceptable quality level?
Response:
- A. 1 - α only
- B. β only
- C. 1 - β only
- D. α only
Answer: C
NEW QUESTION 156
One of the descriptions of component failures can be explained by a mathematical model with a formula showing that the rate of chemical reaction varies exponentially with a rise in operating temperature.
This law is known as the:
Response:
- A. Arrhenius Law.
- B. Poisson Law
- C. Planck Law.
- D. Pareto Law
Answer: A
NEW QUESTION 157
Which of the following is the reason the bathtub curve has an increasing failure rate during the wear-out period?
Response:
- A. Design, materials and environment determine a limit of useful life.
- B. System effectiveness decreases rapidly at this stage.
- C. Design period does not project results past a predetermined time.
- D. Probability of failure is related to external factors that increase over time.
Answer: A
NEW QUESTION 158
Which of the following statements is TRUE about human factor points?
Response:
- A. They are not necessary until the product has been designed and field tested.
- B. They are most costly to incorporate during the concept phase.
- C. They generally cause schedule slippage whenever they are incorporated.
- D. They should be incorporated during the design phase.
Answer: D
NEW QUESTION 159
Which of the following can be used to determine the MTTR?
Response:
- A. Mean time between failures and potential availability.
- B. Mean time between maintenance actions.
- C. Mean maintenance action time.
- D. Mean time between failures.
Answer: A
NEW QUESTION 160
The following fault tree diagram was developed by a team.
The probability are as follow:
A1 = 0.90 B1 = 0.90 C1 = 0.80
A2 = 0.80 B3 = 0.80 C2 = 0.70
A4 = 0.70
The likelihood that the system fault will occur is
Response:
- A. 0.4977
- B. 0.5034
- C. 0.3686
- D. 0.3073
Answer: A
NEW QUESTION 161
Maintenance repair tasks in a large scale system with constant repair rates follow which of the following distributions?
Response:
- A. Lognomal
- B. Geometric
- C. Normal
- D. Exponential
Answer: D
NEW QUESTION 162
For a reliability plan to be most effective, the reliability tasks should be integrated with which of the following plan?
Response:
- A. Reliability centered maintenance.
- B. Product distribution
- C. Product design and development.
- D. Product sales.
Answer: C
NEW QUESTION 163
Which of the following forms of reliability data will BEST provide valuable information on product usage and reliability?
Response:
- A. Independent lab results.
- B. Quality control data.
- C. Field support data
- D. In-house test results
Answer: C
NEW QUESTION 164
In the bath curve model, which one of the sections represents the period when catastrophic failure are likely to occur?
Response:
- A. All periods.
- B. Constant failure rate period.
- C. Infant mortality
- D. Wear out period.
Answer: A
NEW QUESTION 165
Maintainability of equipment may be measured in terms of:
I. Maintenance dollar cost.
II. Maintenance man-hours.
III. Repair time
Response:
- A. II only
- B. III only
- C. I and III only
- D. I, II and III
Answer: D
NEW QUESTION 166
A mission profile is:
I. Time-phased.
II. A summary of events and environments.
III. All activities from initiation to completion of a mission.
Response:
- A. III only
- B. I and III only
- C. I, II and III
- D. II and III only
Answer: C
NEW QUESTION 167
Field data for 20 mechanical suspension systems showed 3 failure during the 12 month warranty period.
When failure occurred they were repair within 2 days and the system returned to operation. If the time of failure for the failed system were 4.4 moths, 6.3 months, and 10.7 months after placement in the field, what is the 90% lower confidence estimate on MTBF?
Response:
- A. 43.5 months
- B. 35.9 months
- C. 33.7 months
- D. 4.1 months
Answer: B
NEW QUESTION 168
In a certain application, two identical transducers are used to measure the vacuum in a system. The system is considered to have failed if either of the vacuums read by the transducers varies from the standard by more than 10mm Hg.
Which of the following is the correct reliability logic block diagram for the transducer assembly?
Response:
- A. Option D
- B. Option B
- C. Option A
- D. Option C
Answer: C
NEW QUESTION 169
In the Taguchi design methodology, what are noise factors?
Response:
- A. Factors that influence variation in the output
- B. Factors that impact tolerance design
- C. Factors that strongly influence the mean response.
- D. Factors that maximize parameter design.
Answer: A
NEW QUESTION 170
An engineer must design a product with a probability of success 99%. Assume that both the strength and stress are normally distributed and that the standard deviations are the same.
If the stress is known to be 3000 lbs with a standard deviation of 100 lbs, what must be the approximate designed strength?
Response:
- A. 3730 lbs.
- B. 4020 lbs.
- C. 3330 lbs.
- D. 3100 lbs.
Answer: C
NEW QUESTION 171
In order to sustain a high system reliability in the field, it is BEST to:
Response:
- A. Follow a preventive maintenance program with scheduled diagnostic checks.
- B. Fully analyze all failed components
- C. Lubricate the equipment exactly to manufacturing specifications.
- D. Write detailed reports on major failure modes.
Answer: A
NEW QUESTION 172
Which of the following is a key element of an effective reliability growth program?
Response:
- A. A field service support organization
- B. A failure reporting analysis and corrective action system.
- C. A reliability prediction program.
- D. Field generated engineering change orders.
Answer: B
NEW QUESTION 173
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