Certification Training for CRE Exam Dumps Test Engine [2021]
Sep 23, 2021 Step by Step Guide to Prepare for CRE Exam
NEW QUESTION 13
What is the minimum number of failure free trips that one must make in their car to be at least 95% confident it is 95% reliable?
Response:
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 14
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. Fractional factorial experiment design
- B. Cause-and-effect analysis.
- C. Taguchi method.
- D. Statistical process control.
Answer: D
NEW QUESTION 15
Which answer mathematically expresses the reliability of an active parallel system in which all component reliabilities are unequal?
Response:
- A. Rs = [RaRbRc + RaRb + RbRc + RaRc ] / [Ra + Rb + Rc]
- B. Rs = [RaRbRc] / [Ra + Rb + Rc]
- C. Rs = Ra + Rb + Rc - RaRbRc
- D. Rs = RaRbRc - (RaRb + RbRc + RaRc) + (Ra + Rb + Rc)
Answer: D
NEW QUESTION 16
When a bathtub curve is used, one characteristic of the flat center portion of the curve is that during this period Response:
- A. The reliability of the system can be expressed as an exponential function
- B. The equipment can be considered highly reliable.
- C. The time of the next failure is predictable from the time of the last failure.
- D. There can be only one type of failure in the system.
Answer: A
NEW QUESTION 17
The design function which assigns probability of failures between components or subsystems is called:
Response:
- A. Apportionment
- B. Significance
- C. Confidence
- D. Qualification
Answer: A
NEW QUESTION 18
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. I and III only
- B. I only
- C. I, II and III
- D. II only
Answer: D
NEW QUESTION 19
What type of failure is usually reduced by periodic overhaul and replacement of component parts?
Response:
- A. Random.
- B. Early life.
- C. Catastrophic.
- D. Wear out.
Answer: D
NEW QUESTION 20
A satellite has two redundant control systems, each has a failure rate (lambda) = 1×10 -6 failures/hour. If one of the systems fails, the failure rate for the remaining system increases to 2×10 -5 failures/hour.
What is the reliability of the redundant control systems at 175,000 hours?
Response:
- A. 0.690
- B. 0.8609
- C. 0.2507
- D. 0.7796
Answer: D
NEW QUESTION 21
What is meant by "derating"?
I. The technique of using a part, component, or equipment under stress conditions considerably below rated values, to achieve a "reliability margin" in design.
II. The technique of using a part, component, or equipment under normal conditions to achieve a reliable product design.
III. The technique of using a part, component, or equipment below stress conditions to achieve a reliable product design.
Response:
- A. I only
- B. I and III only
- C. III only
- D. I, II and III
Answer: A
NEW QUESTION 22
Which process has as its principle parts
- Defining the system.
- Establishing the reliability model.
- Assigning failure rates to the equipment involved.
- Computing the reliability for each function and for the system.
Response:
- A. Design review.
- B. Predicting reliability.
- C. Defining the program plan.
- D. Demonstrating the reliability.
Answer: B
NEW QUESTION 23
In general, reliability testing is performed for which of the following reasons?
I. To detect unanticipated failure modes.
II. To compare estimated failure rates to actual failure rates.
III. To monitor reliability growth over time.
IV. To meet or exceed customer expectations.
Response:
- A. I and III only
- B. I, II, III and IV
- C. I, II and III only
- D. II and IV only
Answer: B
NEW QUESTION 24
Which of the following is NOT an objective of a data collection program?
Response:
- A. To demonstrate internal reliability.
- B. To validate vendor supplied items.
- C. To produce reliability reports.
- D. To demonstrate reliability to customers.
Answer: C
NEW QUESTION 25
Which of the following is the GREATEST benefit of a fault-tree analysis?
Response:
- A. It is bottom-up and provides detailed accident scenario.
- B. It is comprehensive and readily converted to a computer program.
- C. It is systematic and identifies ways to avoid failures.
- D. It is easy to perform and does not require a computer program.
Answer: C
NEW QUESTION 26
For equal length missions an increase in the MTBF will yield:
I. An increase in availability.
II. An increase in reliability.
III. A decrease in reliability.
IV. A decrease in availability.
Response:
- A. III
- B. I
- C. I and II
- D. III and IV
Answer: C
NEW QUESTION 27
A vendor must perform tests on parts to determine which of the following?
Response:
- A. Configuration and size.
- B. Materials and processes.
- C. Cost.
- D. Functional capability under specified environmental conditions.
Answer: D
NEW QUESTION 28
Which of the following statements is TRUE about human factor points?
Response:
- A. They generally cause schedule slippage whenever they are incorporated.
- B. They are most costly to incorporate during the concept phase.
- C. They should be incorporated during the design phase.
- D. They are not necessary until the product has been designed and field tested.
Answer: C
NEW QUESTION 29
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 30
What is meant by catastrophic failure?
I. A gradual change in the operating characteristics of an item resulting in no loss of useful performance.
II. A sudden change in the operating characteristics of an item resulting in complete loss of useful performance.
III. A gradual change in the operating characteristics of an item resulting in complete loss of performance.
Response:
- A. II
- B. II and III
- C. I
- D. All of the above.
Answer: A
NEW QUESTION 31
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