CRE ASQ Certified Reliability Engineer Practice Questions
Prepare for CRE with more than an answer.
- Exam fee
- $550 USD
- Time limit
- 258 minutes
- Passing score
- 550/750
- Level
- Professional
- Valid for
- 3 years
Domains covered on the exam 5
- Reliability Fundamentals19.33%
- Risk Management16.67%
- Probability and Statistics for Reliability23.33%
- Reliability Planning, Testing, and Modeling23.33%
- Lifecycle Reliability17.33%
- 1
When an organization transitions a standard Failure Mode and Effects Analysis (FMEA) into a Failure Mode, Effects, and Criticality Analysis (FMECA) for a safety-critical aerospace subsystem, what specific analytical dimension is integrated into the process?
Show answer details
Correct answer: D
The 'C' in FMECA stands for Criticality. While an FMEA identifies failure modes and assigns a Risk Priority Number (RPN) based on severity, occurrence, and detection, an FMECA adds a specific Criticality Analysis. This is often a quantitative or semi-quantitative calculation that plots the probability of a failure mode occurring against the severity of its consequence, strictly prioritizing items that have severe safety or mission impacts.
- 2
A fault tree has a Top Event triggered by an OR gate. The OR gate receives inputs from Event A (Probability = 0.10) and an AND gate. The AND gate receives inputs from Event B (Probability = 0.20) and Event C (Probability = 0.30). Assuming all basic events are statistically independent, what is the probability of the Top Event occurring?
Show answer details
Correct answer: A
First, calculate the probability of the AND gate (Events B and C occurring together): P(AND) = P(B) * P(C) = 0.20 * 0.30 = 0.06. Next, calculate the OR gate for the Top Event (Event A or the AND gate result). P(Top) = P(A) + P(AND) - (P(A) * P(AND)) = 0.10 + 0.06 - (0.10 * 0.06) = 0.16 - 0.006 = 0.154.
graph TD Top[Top Event] --> OR{OR Gate} OR --> A[Event A: 0.10] OR --> AND{AND Gate: 0.06} AND --> B[Event B: 0.20] AND --> C[Event C: 0.30] - 3
A critical system features dual redundant power supplies designed to ensure continuous operation if one fails. However, a sudden lightning strike causes a power surge that destroys both power supplies simultaneously. In reliability engineering, this scenario is a classic example of:
Show answer details
Correct answer: B
A common mode failure (or common cause failure) occurs when multiple redundant components or systems fail simultaneously or within a short timeframe due to a single shared root cause, such as an environmental extreme (lightning strike), a shared power source, or a systemic design flaw. This defeats the purpose of redundancy.
- 4
Which phase of the traditional reliability bathtub curve is primarily characterized by a decreasing failure rate over time, and is typically addressed through manufacturing quality controls and environmental stress screening (ESS)?
Show answer details
Correct answer: C
The infant mortality phase is the first part of the bathtub curve, characterized by a decreasing failure rate. These early failures are typically caused by manufacturing defects, poor quality control, or substandard materials. They are mitigated through techniques like Environmental Stress Screening (ESS) or burn-in testing before the product reaches the customer.
- 5
A manufacturing production line operates with an availability of 90%, a performance efficiency of 80%, and a quality yield of 95%. Based on these metrics, what is the Overall Equipment Effectiveness (OEE) of the line?
Show answer details
Correct answer: B
Overall Equipment Effectiveness (OEE) is calculated by multiplying three factors: Availability, Performance, and Quality. OEE = 0.90 (Availability) * 0.80 (Performance) * 0.95 (Quality) = 0.684, or 68.4%. This metric is crucial for performance monitoring in reliability engineering to track true manufacturing productivity.
- 6
When integrating Environmental, Social, and Governance (ESG) policies into reliability requirements according to the 2025 CRE Body of Knowledge, which TWO of the following approaches represent direct applications of ESG principles to reliability targets? (Select TWO)
Show answer details
Correct answer: C, D
ESG policies directly influence reliability by driving requirements for product repairability (extending lifecycle and reducing waste) and ensuring safety reliability to prevent environmental contamination. Both align with the 'Environmental' and 'Social' pillars of ESG by minimizing ecological footprints and protecting public safety.
ESG policies directly influence reliability by driving requirements for product repairability (extending lifecycle and reducing waste) and ensuring safety reliability to prevent environmental contamination. Both align with the 'Environmental' and 'Social' pillars of ESG by minimizing ecological footprints and protecting public safety.
