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NEW QUESTION 28
In which of the following distribution is the standard deviation equal to the mean?
Response:
- A. Negative binomial.
- B. Poisson.
- C. Binomial.
- D. Exponential.
Answer: A
NEW QUESTION 29
The primary aim of sequential-life testing is to determine
Response:
- A. Whether a lot meets the reliability goal.
- B. The probability density function of failures.
- C. The mean time between failures (MTBF).
- D. Whether the stress-level variation is significant.
Answer: A
NEW QUESTION 30
An intelligent and good reliability program plan is one that:
Response:
- A. Delineates the responsibilities and interfaces in as general a manner as possible.
- B. Emphasize the planning activities over the control activities.
- C. Defines in detail the complementary activities necessary for improving and assessing the reliability parameter.
- D. Retains flexibility by not formalizing reliability activities so that it cannot be tied down contractually.
Answer: C
NEW QUESTION 31
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 32
Derating a component to 50 percent of its operating value will generally decrease its failure rate by a factor of:
Response:
- A. Less than 10 percent.
- B. Greater than 30 percent.
- C. Greater than 10 percent but less than 30 percent.
- D. Greater than 50 percent.
Answer: B
NEW QUESTION 33
A plastics plant operates 8 extruders producing plastic film. Production volume requirements cannot be met if less than 6 extruders are operating. There is a .30 probability that a machine stopping malfunction will occur.
What is the probability that 6 extruders can remain operating throughout the day?
Response:
- A. 0.5783
- B. 0.8059
- C. 0.4482
- D. 0.5518
Answer: D
NEW QUESTION 34
A field test may be considered satisfactory if:
Response:
- A. The reliability engineer can operate the equipment under all required conditions.
- B. The human factors engineers can operate the equipment under all required conditions.
- C. The design engineer can operate the equipment under all required conditions.
- D. Alternate operators can operate the equipment under all required conditions.
Answer: D
NEW QUESTION 35
Reliability objectives and requirements should be set in which of the following life cycle phases?
Response:
- A. Concept and design.
- B. Validation and test.
- C. Full scale design and development.
- D. Operation and repair.
Answer: A
NEW QUESTION 36
Laboratory tests of a new polymer prototype yielded the following proportions of a critical compound:
4.2 ppm, 4.1 ppm, 4.7 ppm, 4.9 ppm, 5.3 ppm
What is the sample standard deviation?
Response:
- A. 0.445
- B. 0.475
- C. 0.498
- D. 0.464
Answer: C
NEW QUESTION 37
It is of primary importance that the choice of the time-to-failure distribution to represent a particular reliability situation be based on:
Response:
- A. Empirical grounds.
- B. Representation of the failure mechanism.
- C. Convenience
- D. Simplicity of use.
Answer: B
NEW QUESTION 38
Using complete field-based data, a reliability engineer has analyzed the reliability growth of a repairable system over the last 24 months. The analysis suggests a "no growth" condition, and that finding is reported to management.
Due to a pending multimillion dollar order, management requests that a line be drawn to show growth where none actually exists. The engineer's department manager directs the engineer to comply with management request.
The system is released without improvements and the company receives the multimillion dollar order from an external customer. The customer then requests evidence of the reliability growth. Which of the following actions by the engineer would be MOST appropriat?
Response:
- A. Revisit the original data and project artificial reliability growth to satisfy the customer's request.
- B. Arrange a meeting with the customer and discuss all past occurrences
- C. Ask the department manager to respond to the customer's request.
- D. Arrange a meeting with the department manager and upper management to discuss the reliability report.
Answer: D
NEW QUESTION 39
A randomly failing component is tested to r failures, and n observations are made. Degrees of freedom for calculating confidence limits on the mean should be:
Response:
- A. n - 1
- B. n
- C. 2r + 2
- D. 2r
Answer: D
NEW QUESTION 40
The design function which assigns probability of failures between components or subsystems is called:
Response:
- A. Confidence
- B. Qualification
- C. Apportionment
- D. Significance
Answer: C
NEW QUESTION 41
Which of the following is an analytical approach used during the manufacturing process where process conditions are changed systematically for the purpose of determining modifications required for product improvement?
Response:
- A. Taguchi method.
- B. Cause-and-effect analysis.
- C. Fractional factorial experiment design
- D. Statistical process control.
Answer: D
NEW QUESTION 42
A highly accelerated stress screening (HASS) test can help to detect and separate units with manufacturing defects. HASS test limits are typically developed from:
Response:
- A. Production reliability acceptance tests.
- B. Statistical process control data
- C. Bayesian reliability testing.
- D. Highly Accelerated Life Tests.
Answer: D
NEW QUESTION 43
Arrange the following failure data steps into the correct sequence from start to finish.
I. Verify the failure.
II. Identify and control the failure.
III. Investigate the failure.
IV. Provide corrective action and follow up.
V. Report the fail.
Response:
- A. I, II, V, III, IV
- B. II, V, I, III, IV
- C. III, II, V, I, IV
- D. I, II, III, IV, V
Answer: B
NEW QUESTION 44
Which of the following is NOT a major consideration in performing a human factors analysis?
Response:
- A. Latent path analysis.
- B. Conventional user expectations.
- C. Ergonomic evaluation.
- D. Hazard analysis.
Answer: A
NEW QUESTION 45
For a corrective action system to be effective, which of the following is MOST important?
Response:
- A. Warranty analysis.
- B. Follow - up.
- C. Design maturity.
- D. Robustness testing.
Answer: B
NEW QUESTION 46
Random sampling plans are based on which of the following assumption?
Response:
- A. Every item has an equal chance of being selected.
- B. The data are accurate.
- C. The process is unstable.
- D. A specific dependency model has been selected.
Answer: A
NEW QUESTION 47
The BEST way to set an overall reliability goal is to:
Response:
- A. Put down specific numerical requirements for reliability statements of operating environments, and a definition of successful product performance.
- B. Write a specification calling for a product to have high reliability and incorporate it into a contract.
- C. Insist that the goal be expressed in terms of mean-time-between-failures for all components and assemblies.
- D. Indicate who would be at fault if the desired reliability is not obtained during the warranty.
Answer: A
NEW QUESTION 48
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 49
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 50
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