CCT Calibration Standards & Regulations 3

Question 1

What is the correct definition of 'measurement uncertainty' as used in calibration standards?

Accepted Answer

A parameter associated with the result of a measurement that characterizes the dispersion of values

Answer

Per GUM (Guide to the Expression of Uncertainty in Measurement), uncertainty is a parameter characterizing the dispersion of values that could reasonably be attributed to the measurand.

Question 2

Which document provides the internationally accepted methodology for evaluating and expressing measurement uncertainty?

Accepted Answer

JCGM 100:2008 (GUM)

Answer

JCGM 100:2008, commonly known as the GUM (Guide to the Expression of Uncertainty in Measurement), provides the internationally accepted framework for uncertainty evaluation.

Question 3

Under ANSI/NCSL Z540.3, what is the maximum acceptable probability that a measurement result exceeds the tolerance limits?

Accepted Answer

2%

Answer

ANSI/NCSL Z540.3 requires that the probability of false acceptance (accepting an out-of-tolerance item as in-tolerance) does not exceed 2% per measurement.

Question 4

What does the 'Test Uncertainty Ratio' (TUR) represent?

Accepted Answer

The ratio of the tolerance of the unit under test to the uncertainty of the measurement standard

Answer

TUR is the ratio of the tolerance of the unit under test (UUT) to the expanded uncertainty of the measurement process used to calibrate it.

Question 5

Which of the following best describes a Type A evaluation of measurement uncertainty?

Accepted Answer

Uncertainty evaluated by statistical analysis of a series of observations

Answer

Type A evaluation of uncertainty uses statistical methods applied to a series of repeated observations, such as calculating the standard deviation of a measurement set.

(CCT) Certified Calibration Technician Practice Test

(CCT) Certified Calibration Technician Practice Test

CCT Calibration Standards & Regulations 3