合格目指せCRE試験最新のCRE試験問題集PDF 2023年更新
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質問 # 206
In a life test of 4 batteries, failures were observed after 10, 30, and 40 hours. The 4th battery was tested
75 hours without failure, at which time the test was terminated.
What are the estimated Mean-Time-To-Failure (theta) and failure rate (lambda)?
Response:
- A. Estimated MTTF = 27; Failure rate = .038
- B. Estimated MTTF = .019; Failure rate = 52
- C. Estimated MTTF = 14; Failure rate = .017
- D. Estimated MTTF = 52; Failure rate = .019
正解：D
質問 # 207
Which of the following provides the maximum benefit of parts standardization?
Response:
- A. More reliable processes.
- B. Lower product life cycle costs.
- C. Fewer warranty claims.
- D. Fewer inspection errors.
正解：B
質問 # 208
Which of the following is NOT true about the Taguchi DOE approach?
I. It includes the concept of loss function in factorial experiments.
II. It assumes losses occur when a process fails to meet a target value.
III. It assumes losses are due to variability within the process.
IV. It assumes that the loss function is a step function relative to the specification limits.
Response:
- A. III only
- B. II only
- C. IV only
- D. I only
正解：C
質問 # 209
FMECA is:
Response:
- A. A technique useful for space-government project.
- B. A formal technique for review of failure potentials during design.
- C. A professional engineering organization.
- D. A technique to assure that design performance guidelines are fulfilled.
正解：B
質問 # 210
Preventive maintenance is characterized by:
I. Replacing failed/defect items as they are found in normal service use II. A planned program of tests, inspections, and/or replacements III. Replacing items just before they fail Response:
- A. II only
- B. I, II and III
- C. I only
- D. I and III only
正解：A
質問 # 211
A standard parts program is likely to have which of the following positive and negative effects?
Response:
- A. Option D
- B. Option A
- C. Option C
- D. Option B
正解：A
質問 # 212
If the plating time of a tube increases as the inside diameter decreases, then the correlation coefficient for the insider diameter versus plating time would be:
Response:
- A. Between 0 and +1
- B. Equal to 1
- C. Greater than 1
- D. Between 0 and -1
正解：D
質問 # 213
Which of the following is the GREATEST benefit of a fault-tree analysis?
Response:
- A. It is comprehensive and readily converted to a computer program.
- B. It is easy to perform and does not require a computer program.
- C. It is systematic and identifies ways to avoid failures.
- D. It is bottom-up and provides detailed accident scenario.
正解：C
質問 # 214
The House of Quality incorporates a correlation matrix roof. This describes the relationships between which of the following?
Response:
- A. Competitive comparisons.
- B. Whats and hows.
- C. Hows [design features].
- D. Whats [customer needs].
正解：C
質問 # 215
What type of failure is usually reduced by periodic overhaul and replacement of component parts?
Response:
- A. Random.
- B. Catastrophic.
- C. Early life.
- D. Wear out.
正解：D
質問 # 216
The influence of FMEA on reliability is maximized at which of the following stages of development?
Response:
- A. Prototype.
- B. Design.
- C. Test.
- D. Operation.
正解：B
質問 # 217
In a production reliability acceptance test (PRAT) plan, the design/discrimination ratio is expressed as the ratio of Response:
- A. Upper test MTBF/lower test MTBF.
- B. Consumer's risk/producer's risk.
- C. Producer's risk/consumer's risk.
- D. Lower test MTBF/upper test MTBF.
正解：A
質問 # 218
In the House of Quality, the principal matrix shows the relationship between:
Response:
- A. Specifications and Results.
- B. Reliability Results and Time.
- C. Quality Requirements and Quality Inspection.
- D. Wants and Hows.
正解：D
質問 # 219
Which of the following is a continuous probability distribution?
Response:
- A. Binomial
- B. Poisson
- C. Hypergeometric
- D. Weibull
正解：D
質問 # 220
A company is in a multi-products, competitive market. Which of the following is the MOST appropriate strategy to help capture the maximum market share?
Response:
- A. Improving the capacity of manufacturing process.
- B. Increasing the reliability of current product
- C. Reducing cycle time while introducing new, reliable products.
- D. Performing aggressive field-testing.
正解：C
質問 # 221
Measures of availability include:
I. Effectiveness.
II. Inherent.
III. Achieved.
IV. Dependability.
V. Capability.
Response:
- A. II, III and IV
- B. II and III only
- C. I, III and IV
- D. III, IV and V
正解：B
質問 # 222
Under a cost of reliability model, which of the following factors is used to determine warranty costs?
Response:
- A. Product design costs.
- B. Repair costs
- C. Screening costs.
- D. Environmental costs
正解：B
質問 # 223
A product - design team is in the material-selection phase for a new product. The following four treatments need to be considered:
What is the maximum number of treatment combinations?
Response:
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
質問 # 224
Root cause analysis provides a common sense approach to evaluating a problem. Align the following action steps in proper sequence from start to finish.
I. Describe problem conditions.
II. Develop possible problem causes.
III. Collect facts and determine relationships.
IV. Validate the true problem causes.
V. Define the problem statement.
Response:
- A. I, V, III, IV, II
- B. V, III, I, IV, II
- C. V, I, III, II, IV
- D. . I, V, IV, II, III
正解：C
質問 # 225
Which answer mathematically expresses the reliability of an active parallel system in which all component reliabilities are unequal?
Response:
- A. Rs = Ra + Rb + Rc - RaRbRc
- B. Rs = [RaRbRc + RaRb + RbRc + RaRc ] / [Ra + Rb + Rc]
- C. Rs = RaRbRc - (RaRb + RbRc + RaRc) + (Ra + Rb + Rc)
- D. Rs = [RaRbRc] / [Ra + Rb + Rc]
正解：C
質問 # 226
According to the definition of reliability, performance, over the expected or intended life, is one criterion. In order to obtain a measurement for reliability, the actual life (t) must be compared to which of the following?
Response:
- A. Probability of failures.
- B. Required life
- C. MTBF
- D. Test cycles.
正解：B
質問 # 227
A system has components connected in active parallel. At least n - 1 of the components must operate for the system to function properly. Suppose the time to failure of each component has an exponential distribution with the same failure rate λ. The mean time to failure of this system is:
Response:
- A. 2/(n - 1) λ
- B. (n - 1)/n 2 λ
- C. 1/(n - 1) λ
- D. (2n - 1)/n(n - 1) λ.
正解：D
質問 # 228
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