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NEW QUESTION 78
For single-failure modes, the probability plotting methods used to derive time-to-failure distribution parameters are applicable only when the data are Response:
- A. Gathered for repairable systems.
- B. Exponentially distributed.
- C. Independently and identically distributed.
- D. Independently and normally distributed.
Answer: C
NEW QUESTION 79
The department having the authority to sign all deviations pertaining to the design of the product is normally:
Response:
- A. Contractual
- B. Manufacturing engineering.
- C. Design engineering.
- D. Inspection
Answer: C
NEW QUESTION 80
Which of the following are the MOST desirable basic skills required of a reliability engineer assigned to a cross-functional product team?
Response:
- A. Experience with FMECA and FTA.
- B. Reliability trouble shooting, data collection and analysis.
- C. Reliability planning, testing and measurement.
- D. Communication, co-operation, and technical knowledge.
Answer: D
NEW QUESTION 81
Which of the following graphs represents a product that is a good candidate for an accelerated degradation test involving overstress testing?
Response:
- A. Option A
- B. Option D
- C. Option B
- D. Option C
Answer: A
NEW QUESTION 82
What is the reliability of the power switching system schematic on the left after 30,000 hours ? The electric utility primary power system (A) has a failure rate of 0.00001 failure/hour.
The motor generator backup system (B) has a failure rate of 0.0007 failure/hour. The standby system has an imperfect switch with 0.90 reliability per operation.
Response:
- A. 0.87
- B. 0.80
- C. 0.83
- D. 0.75
Answer: D
NEW QUESTION 83
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. Understanding logical symbols.
- C. Needing a different FTA for each defined top event.
- D. Assigning probabilities to the various events.
Answer: C
NEW QUESTION 84
What is the general use of an R chart?
Response:
- A. To determine the variance of the process.
- B. To determine if the process mean is in control.
- C. To determine if the process is in control.
- D. To determine if the process variance is in control.
Answer: D
NEW QUESTION 85
Who should be chairperson of a design review committee?
Response:
- A. A senior member of management.
- B. The chief designer.
- C. The person best able to make decisions on a design.
- D. The reliability engineer.
Answer: C
NEW QUESTION 86
All of the following statements are TRUE about confidence interval EXCEPT Response:
- A. The width indicate the uncertainty in estimates.
- B. A smaller sample size would yield a larger width
- C. The width does not depend on the confidence level.
- D. A larger sample size would yield a smaller width
Answer: C
NEW QUESTION 87
Combined environmental reliability testing allows for a:
Response:
- A. Range of test conditions in excess of design tolerances
- B. Use of a common acceleration factor for relative MTTF from its accelerated condition to its normal condition
- C. Method for certification of test results.
- D. Multiple stress test
Answer: D
NEW QUESTION 88
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
Answer: B
NEW QUESTION 89
Which of the following FTA statements is NOT true?
Response:
- A. It includes common mode failure effects.
- B. It provides corrective actions for component failures.
- C. It indicates the critical path from system failure to component failure.
- D. It illustrates the overall system behavior.
Answer: B
NEW QUESTION 90
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. Equal to 1
- B. Greater than 1
- C. Between 0 and +1
- D. Between 0 and -1
Answer: D
NEW QUESTION 91
Which of the following action will help eliminate the effects of extraneous factors in a designed experiment?
Response:
- A. Selecting factor levels.
- B. Fractionating the experiment.
- C. Randomizing the experiment.
- D. Repeating the experiment under different conditions.
Answer: C
NEW QUESTION 92
What is the MOST accurate method to verify that the maintainability requirement of a design is being met?
Response:
- A. By demonstration at the customer's facility.
- B. By analysis of the design.
- C. By thorough design reviews.
- D. By performing maintainability prediction.
Answer: A
NEW QUESTION 93
Which of the following is the main advantage of a step stress test?
Response:
- A. It runs at constant stress
- B. It yields failure quickly
- C. It segregate discrepant hardware
- D. It guarantees accurate estimates
Answer: B
NEW QUESTION 94
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. 35.9 months
- B. 4.1 months
- C. 43.5 months
- D. 33.7 months
Answer: A
NEW QUESTION 95
What is this system's reliability at 700 hours?
Component failure data is : - Failure rate of A = 0.0007 failures/hr - Reliability of B = 0.92 - MTTF of C =
1400 hours - Reliability of D = 0.85.
Response:
- A. 0.986
- B. 0.998
- C. 0.994
- D. 0.952
Answer: B
NEW QUESTION 96
Which of the following techniques is MOST beneficial in tracking a process to determine whether corrective action should be taken?
Response:
- A. Pareto analysis.
- B. Control charting.
- C. Time series plotting.
- D. Trend analysis.
Answer: B
NEW QUESTION 97
For complex electronics systems, the major contributor to repair time is generally:
Response:
- A. Remove/replace.
- B. Disassembly/reassembly.
- C. Diagnosis.
- D. Final checkout.
Answer: C
NEW QUESTION 98
The success of the FMEA is principally dependent on:
I. Good communication between the reliability engineer and the designer.
II. Use of the correct form and definitions.
III. Early determination of the reliability critical items.
Response:
- A. I only
- B. II only
- C. III only
- D. II and III only
Answer: A
NEW QUESTION 99
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