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CRE PDF Questions and Testing Engine With 456 Questions
NEW QUESTION 150
The probability of an accident for the head event "H" given below is:
Response:
- A. 0.1125.
- B. 0.1100.
- C. 0.0700.
- D. 0.0689.
Answer: D
NEW QUESTION 151
Fifteen(15) motors were tested for a total of 1,200 cumulative hours, with four failure occuring. The test was then failure-truncated. If the failure rate is assumed to be constant, what is the 95% lower confidence limit of MTBF?
Response:
- A. 131 hours.
- B. 876 hours.
- C. 155 hours.
- D. 609 hours
Answer: C
NEW QUESTION 152
A failure that occurs without being caused by the failure of any other item is known as:
Response:
- A. A dependent failure.
- B. An intermittent failure.
- C. An independent failure.
- D. A pattern failure.
Answer: C
NEW QUESTION 153
The most important reliability characteristic of a product is that it:
Response:
- A. Demonstrates low warranty costs
- B. Performs the required functions throughout the product life cycle
- C. Has easy maintenance and service features
- D. Has a higher MTBF than its competitors
Answer: B
NEW QUESTION 154
The designer has certain tools for reliable design at his/her disposal. He/She can:
I. Simplify the design and minimize the number of parts without degrading performance.
II. Perform design reliability review by means of reliability analysis.
III. Apply component derating techniques.
IV. Reduce the elevated operating temperature of components.
Response:
- A. I, II, III and IV
- B. I and III only
- C. I, II and III only
- D. II and IV only
Answer: A
NEW QUESTION 155
50 resisters from a lot of 75,000 were tested. The average was 3,306 ohms with a variance of 21,609 ohm 2 . From this information, we may conclude with 99% confidence, that at least 95% of this lot will have resistance values in the range of Response:
- A. 2927 - 3,685 ohms
- B. 2,865 - 3,747 ohms
- C. 3,012 - 3,600 ohms
- D. 2,846 - 3,766 ohms
Answer: A
NEW QUESTION 156
What is the Z value needed to conduct a two tail test in a statistical inference problem, specifying 90% level of confidence?
Response:
- A. 1.96
- B. 1.65
- C. 2.24
- D. 1.28
Answer: B
NEW QUESTION 157
Some keys to a successful reliability program include:
I. An evolutionary approach to new product development
II. Emphasis on manufacturing conformance to specifications
III. Development of strong long-term relationships with a small number of suppliers IV. The use of standards for guidance and lessons learned Response:
- A. I and IV only
- B. I, II, III and IV
- C. II, III and IV only
- D. I, III and IV only
Answer: D
NEW QUESTION 158
Ideally for a FRACAS to be effective, how many failures should be allowed to pass before corrective action is to be undertaken?
Response:
- A. Second occurrence of a failure mode.
- B. First occurrence of a failure mode.
- C. Fourth occurrence of a failure mode.
- D. Third occurrence of a failure mode.
Answer: B
NEW QUESTION 159
Product reliability concerns the relationship of product function to:
Response:
- A. Customer demands.
- B. Cost.
- C. Design.
- D. Time.
Answer: D
NEW QUESTION 160
Typical statistical distributions or confidence limits can be determined for accelerated tests. In the case of a step-stress test, the proper estimated distribution would be which of the following?
Response:
- A. Lognormal
- B. Exponential
- C. Weibull
- D. None, not meaningful.
Answer: D
NEW QUESTION 161
A system is turned off every 30 days for 5 minutes for on line maintenance. If the probability of system failure due to hardware failure is negligible, what is the system's unavailability?
Response:
- A. 3.472 × 10 -4
- B. 0.0333
- C. 1.157 × 10 -4
- D. 0.999
Answer: C
NEW QUESTION 162
Which of following is NOT elements of risk priority number for FMEA?
Response:
- A. Catastrophic
- B. Detection
- C. Severity
- D. Probability
Answer: A
NEW QUESTION 163
Which of the following activities is MOST effective in increasing reliability during a product's life cycle?
Response:
- A. Developing an aggressive testing strategy.
- B. Improving gage repeatability and reproducibility
- C. Developing robust design.
- D. Developing capable processes.
Answer: C
NEW QUESTION 164
A first step in the FMECA is to:
Response:
- A. Compile a critical items list.
- B. Identify failure modes.
- C. Establish ground rules to which the FMECA is performed.
- D. Define the system requirements.
Answer: D
NEW QUESTION 165
If the probability of a car starting on a sub-zero morning is 0.6, and we have two such cars. What is the probability that at least one of the cars will start on a sub-zero morning?
Response:
- A. 0.92
- B. 0.84
- C. 0.60
- D. 0.81
Answer: B
NEW QUESTION 166
The primary reason for improving equipment accessibility is to:
Response:
- A. Improve service life.
- B. Maximize labor utilizations.
- C. Minimize equipment downtime.
- D. Improve equipment reliability.
Answer: C
NEW QUESTION 167
When a bathtub curve is used, one characteristic of the flat center portion of the curve is that during this period Response:
- A. The time of the next failure is predictable from the time of the last failure.
- B. The equipment can be considered highly reliable.
- C. There can be only one type of failure in the system.
- D. The reliability of the system can be expressed as an exponential function
Answer: D
NEW QUESTION 168
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. 4.1 months
- C. 33.7 months
- D. 35.9 months
Answer: D
NEW QUESTION 169
Maintainability is:
Response:
- A. Probability of survival of a system for a given period of time.
- B. The probability of a system being restored to functional operation within a given period of time.
- C. Performing adequate maintenance on a system.
- D. Maintaining a machine in satisfactory working condition.
Answer: B
NEW QUESTION 170
Customer feedback and field data could NOT normally:
Response:
- A. Provide information for company's management.
- B. Provide information for reliability performance measures
- C. Allow management to identify who is to blame.
- D. Provide information for product improvement.
Answer: C
NEW QUESTION 171
Derating enhance reliability in all of the following ways EXCEPT by
Response:
- A. Increasing the long-term drift in parameter values.
- B. Restricting stress on components to levels below their rated limits
- C. Reducing the impact of parameter variations.
- D. Establishing a robustness design margin
Answer: D
NEW QUESTION 172
A failure that leaves the system fully functional is:
Response:
- A. A nuisance failure.
- B. A chronic failure.
- C. A major failure.
- D. A minor failure.
Answer: D
NEW QUESTION 173
Your customer required a paper cutting machine with these specifications:
Speed : 100m/minute; Cutting width : 47 inches; Good product : 99%
You deliver a machine to this customer with these specifications :
Speed : 110m/minute; Cutting width : 48 inches; Good product: 97%.
How would you classify this success/failure ?
Response:
- A. A technical failure.
- B. None of the above.
- C. A technical success, but quality failure.
- D. A limited success
Answer: A
NEW QUESTION 174
The reliability of a device comprised of various parts functioning in series is the:
Response:
- A. Sum of the probabilities of the unreliability.
- B. Product of the reliability.
- C. Sum of the reliability.
- D. Product of the unreliability
Answer: B
NEW QUESTION 175
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