CRE Sample Questions & Answers
Probability and statistics tie with planning, testing and modeling for the top share, ahead of lifecycle maintainability, foundational reliability leadership, and identifying, analyzing and mitigating risk.
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- Question 1Intermediate
Reliability Fundamentals · Root cause analysis
A cross-functional team is using the 8D methodology to resolve a recurring field failure. They have just implemented an interim containment action to isolate the customer from the defect. According to the standard 8D process, what is the immediate next step the team must take?
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Correct answer: D
In the 8D (Eight Disciplines) problem-solving methodology, D3 is 'Develop Interim Containment Actions'. Once containment is achieved to protect the customer, the immediate next step is D4: 'Determine and Verify Root Causes and Escape Points'.
flowchart LR D2[D2: Describe Problem] --> D3[D3: Interim Containment] D3 --> D4[D4: Root Cause Analysis] D4 --> D5[D5: Develop Permanent Fix] - Question 2Beginner
Reliability Fundamentals · Basic reliability terminology
True or False: Mean Time Between Critical Failure (MTBCF) is generally a lower numerical value than Mean Time Between Failures (MTBF) because MTBCF encompasses all types of failures, while MTBF only accounts for catastrophic events.
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Correct answer: B
False. The definitions are reversed in the statement. MTBF generally includes all relevant failures that require maintenance, whereas MTBCF strictly measures the time between failures that cause a critical loss of system function or safety hazard. Because critical failures are a subset of all failures, MTBCF is typically a higher numerical value (longer time) than overall MTBF.
- Question 3Intermediate
Reliability Fundamentals · Basic reliability terminology
A repairable system has accumulated a total operating time of 4,000 hours over a year. During this period, it experienced 10 failures requiring a total active repair time of 100 hours, plus an additional 50 hours of administrative and logistic delay time. What is the inherent availability of this system?
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Correct answer: A
Inherent availability (Ai) considers only the ideal engineering parameters: MTBF and MTTR, excluding administrative/logistic delays. MTBF = 4000 hours / 10 failures = 400 hours. MTTR = 100 hours / 10 failures = 10 hours. Ai = MTBF / (MTBF + MTTR) = 400 / (400 + 10) = 400 / 410 = 0.9756 or 97.56%. Operational availability would include the logistic delay time.
- Question 4Beginner
Reliability Fundamentals · Ethics in reliability engineering
A reliability engineer discovers a design flaw in a new consumer appliance during pre-production testing. The flaw does not violate any legal safety standards, but historical data models predict it will reduce the product's lifespan by 25% just after the warranty expires. The project manager instructs the engineer to omit this finding from the final report to ensure an on-time product launch.
According to the ASQ Code of Ethics, what is the most appropriate action for the reliability engineer to take?
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Correct answer: A
The ASQ Code of Ethics requires professionals to be honest and impartial, and to issue public statements (or internal technical reports) only in an objective and truthful manner. Omitting critical reliability data that materially affects product performance, even if safety is not compromised, violates the ethical obligation to provide accurate information to stakeholders and employers.
- Question 5Advanced
Reliability Fundamentals · Six Sigma methodologies
A cross-functional team is applying Six Sigma DMAIC principles to solve a chronic degradation issue in a hydraulic actuator. During which phase of the DMAIC process would the reliability engineer most likely utilize a Duane growth model to evaluate the effectiveness of the newly implemented design changes?
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Correct answer: B
The Duane growth model is used to track reliability improvement (growth) over time as design changes are implemented. In the Six Sigma DMAIC framework, verifying that the implemented improvements are sustained and measuring the ongoing performance occurs in the Control phase. The team monitors the system to ensure the degradation issue is permanently resolved.
- Question 6Beginner
Reliability Fundamentals · Project management in reliability engineering
The ___________ uses a graphical representation linking project tasks against a calendar to help reliability engineers manage requirements, visualize scheduling, and identify project progress over time.
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Correct answer: C
A Gantt chart is a bar chart that graphically represents a project schedule, showing the start and finish dates of elements of a project. While CPM is used to calculate the longest path of planned activities, the Gantt chart provides the specific visual calendar-based representation described in the prompt.
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