CQI CQI Metrology & Measurement Systems 1 — Questions and Answers
Question 1: What is the primary purpose of calibration in metrology?
- To clean measurement instruments
- To ensure measurements are traceable to a known standard (Correct answer)
- To extend the life of instruments
- To train operators on instrument use
Correct answer: To ensure measurements are traceable to a known standard
Calibration establishes measurement traceability by comparing an instrument's readings to a known reference standard.
Question 2: Which instrument is commonly used to measure the internal diameter of a bore?
- Outside micrometer
- Vernier caliper
- Bore gauge (Correct answer)
- Surface plate
Correct answer: Bore gauge
A bore gauge is specifically designed to accurately measure internal diameters.
Question 3: What does 'measurement uncertainty' represent?
- The error in a measurement
- The doubt about the validity of a measurement result (Correct answer)
- A calibration failure
- The range of the instrument
Correct answer: The doubt about the validity of a measurement result
Measurement uncertainty quantifies the doubt associated with a measurement result, expressing the range within which the true value likely falls.
Question 4: How often should measuring instruments be calibrated?
- Only when they are new
- According to a defined calibration schedule based on use and risk (Correct answer)
- Every 10 years
- Only after repair
Correct answer: According to a defined calibration schedule based on use and risk
Calibration frequency is determined by usage, environmental conditions, and the risk associated with out-of-calibration measurements.
Question 5: What is the purpose of a surface plate in metrology?
- To measure surface roughness
- To provide a flat reference datum for measurements (Correct answer)
- To calibrate micrometers
- To store measurement tools
Correct answer: To provide a flat reference datum for measurements
A surface plate provides a known flat datum used as a reference plane for dimensional measurements and layout work.
Question 6: What is a 'go/no-go' gauge used for?
- Measuring exact dimensions
- Verifying that a feature is within specified tolerance limits (Correct answer)
- Calibrating other instruments
- Measuring surface finish
Correct answer: Verifying that a feature is within specified tolerance limits
A go/no-go gauge quickly verifies whether a feature falls within its tolerance limits without providing an exact measurement value.
CQI CQI Metrology & Measurement Systems 1
What is the primary purpose of calibration in metrology?