CMS Equipment Calibration & Maintenance 3 — Questions and Answers
Question 1: In a Gauge R&R study, 'Reproducibility' measures variation due to:
- The part-to-part differences
- Different operators using the same gauge (Correct answer)
- Environmental temperature fluctuations
- Gauge wear over time
Correct answer: Different operators using the same gauge
Reproducibility captures the variation in measurements when different operators use the same gauge to measure the same part under the same conditions.
Question 2: What is the primary purpose of a control chart used during equipment monitoring?
- To calculate the total cost of ownership
- To detect process shifts and out-of-control conditions in real time (Correct answer)
- To replace calibration records
- To schedule preventive maintenance automatically
Correct answer: To detect process shifts and out-of-control conditions in real time
Control charts plot process data over time with statistical control limits, enabling real-time detection of trends, shifts, or out-of-control conditions.
Question 3: A thermocouple used in a heat treatment furnace fails to respond quickly to temperature changes. This performance issue is called:
- Zero drift
- Span error
- Slow response time (lag) (Correct answer)
- Hysteresis
Correct answer: Slow response time (lag)
Slow response time or lag refers to the delay between an actual temperature change and the sensor's measurement update, affecting process control accuracy.
Question 4: Which lubrication strategy matches the correct lubricant viscosity to equipment operating conditions to maximize equipment life?
- Reactive lubrication
- Tribology-based lubrication (Correct answer)
- Time-based lubrication
- Breakdown lubrication
Correct answer: Tribology-based lubrication
Tribology-based lubrication applies the science of friction, wear, and lubrication to select the optimal lubricant viscosity and type for specific operating temperatures, loads, and speeds.
Question 5: An ISO 9001 quality management system requires calibration records to be retained for:
- 6 months minimum
- At least the life of the equipment or as defined by the organization (Correct answer)
- Exactly 3 years
- 10 years per federal law
Correct answer: At least the life of the equipment or as defined by the organization
ISO 9001 requires that calibration records be retained for a period determined by the organization, typically covering the life of the equipment and any traceability requirements.
Question 6: Which failure pattern describes equipment that has a high early failure rate, a low constant failure rate in midlife, and increasing failures at end of life?
- Exponential failure curve
- Bathtub curve (Correct answer)
- Poisson distribution
- Weibull steep-ramp curve
Correct answer: Bathtub curve
The bathtub curve models the three phases of equipment life: infant mortality (early failures), useful life (constant low failure rate), and wear-out (increasing failure rate).
Question 7: When a CNC machine spindle is checked for runout, the instrument most commonly used is a:
- Micrometer
- Dial indicator (test indicator) (Correct answer)
- Vernier caliper
- Feeler gauge
Correct answer: Dial indicator (test indicator)
A dial indicator (test indicator) is mounted on a fixed reference and measures the radial or axial deviation of the rotating spindle as it completes a revolution.
CMS Equipment Calibration & Maintenance 3
In a Gauge R&R study, 'Reproducibility' measures variation due to: