CCIL Laboratory Equipment Calibration 4

Question 1

Which statistical parameter is used to describe the spread of repeated calibration measurements around the mean?

Accepted Answer

Standard deviation

Answer

Standard deviation quantifies the dispersion of repeated measurements and is a key component in calculating measurement uncertainty.

Question 2

ISO/IEC 17025 requires that calibration laboratories demonstrate competence through:

Accepted Answer

Proficiency testing and interlaboratory comparisons

Answer

ISO/IEC 17025 mandates participation in proficiency testing programs to objectively demonstrate measurement competence.

Question 3

What is 'dead weight' testing used to calibrate in laboratory settings?

Accepted Answer

Pressure gauges and transducers

Answer

Dead weight testers use known masses on a piston-cylinder system to generate precise pressure values for calibrating pressure measurement instruments.

Question 4

Which calibration interval strategy adjusts frequency based on actual instrument performance history?

Accepted Answer

Risk-based adaptive calibration intervals

Answer

Adaptive calibration intervals use historical as-found data to extend intervals for stable instruments and shorten them for drifting ones.

Question 5

When expressing calibration results, the expanded uncertainty is typically reported at a confidence level of:

Accepted Answer

95%

Answer

By convention (GUM), expanded uncertainty U = k × uc is reported at approximately 95% confidence, typically using a coverage factor k = 2.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Laboratory Equipment Calibration 4