ASQ Certified Quality Inspector & Reliability Engineer 5 — Questions and Answers
Question 1: System availability (A) is correctly expressed as:
- MTBF / MTTR
- MTBF / (MTBF + MTTR) (Correct answer)
- MTTR / (MTBF + MTTR)
- 1 / MTBF
Correct answer: MTBF / (MTBF + MTTR)
Availability A = MTBF / (MTBF + MTTR), representing the proportion of time a system is operational.
Question 2: A quality engineer wants to determine whether there is a linear relationship between oven temperature and tensile strength. Which tool is most appropriate?
- Histogram
- Control chart
- Scatter diagram with regression analysis (Correct answer)
- Pareto chart
Correct answer: Scatter diagram with regression analysis
Scatter diagrams visually show correlation, and regression analysis quantifies the linear relationship between two continuous variables.
Question 3: According to MIL-HDBK-217, what is the primary method for predicting electronic component reliability?
- Fault Tree Analysis
- Parts count and parts stress reliability prediction (Correct answer)
- Accelerated life testing
- Monte Carlo simulation
Correct answer: Parts count and parts stress reliability prediction
MIL-HDBK-217 provides parts count and parts stress methods to predict failure rates of electronic components based on part type and operating conditions.
Question 4: During a first article inspection (FAI), the inspector is verifying that:
- All production lot units meet specifications
- The first unit from a new production process meets all design requirements (Correct answer)
- The inspection equipment is calibrated
- Incoming raw materials are acceptable
Correct answer: The first unit from a new production process meets all design requirements
FAI confirms that the production process, tooling, and materials produce a product that fully conforms to design requirements before full production begins.
Question 5: A reliability test places 20 units on test; 4 fail during 1000 hours of testing. Using the time-terminated test, what is the estimated MTBF?
- 250 hours
- 4,000 hours
- 5,000 hours (Correct answer)
- 20,000 hours
Correct answer: 5,000 hours
MTBF = Total unit-hours / Number of failures = (20 × 1000) / 4 = 20,000 / 4 = 5,000 hours.
Question 6: Which sampling standard is most commonly referenced in the US for attribute inspection sampling plans based on AQL?
- ISO 9001
- ANSI/ASQ Z1.4 (Correct answer)
- MIL-STD-105
- ANSI/ASQ Z1.9
Correct answer: ANSI/ASQ Z1.4
ANSI/ASQ Z1.4 is the current US standard for attribute sampling inspection plans indexed by AQL (formerly MIL-STD-105E).
Question 7: In a Design of Experiments (DOE), a full factorial design with 3 factors each at 2 levels requires how many experimental runs (excluding replication)?
- 6
- 8 (Correct answer)
- 9
- 12
Correct answer: 8
A 2³ full factorial design requires 2³ = 8 experimental runs to test all combinations of 3 factors at 2 levels.
ASQ Certified Quality Inspector & Reliability Engineer 5
System availability (A) is correctly expressed as: