CCT Measurement Uncertainty & Error Analysis 3

Question 1

What is an uncertainty budget in calibration?

Accepted Answer

A tabulated list of all uncertainty sources with their magnitudes and combined contribution

Answer

The cost allocation for purchasing calibration standards

Answer

The time allocated for performing each calibration task

Answer

A record of the instruments that exceeded their uncertainty limits

Question 2

Repeatability in measurement is defined as:

Accepted Answer

Closeness of agreement between repeated measurements under the same conditions in a short time period

Answer

Closeness of agreement between results obtained with different instruments

Answer

Consistency of results obtained in different laboratories

Answer

Agreement between a measurement and the accepted reference value

Question 3

Reproducibility in measurement differs from repeatability in that it:

Accepted Answer

Assesses agreement under varied conditions such as different operators, locations, or instruments

Answer

Requires more measurements to calculate

Answer

Only applies to electrical measurements

Answer

Is always a smaller uncertainty component than repeatability

Question 4

The Welch-Satterthwaite equation in uncertainty analysis is used to:

Accepted Answer

Calculate the effective degrees of freedom for the combined uncertainty

Answer

Convert Type B uncertainties to Type A equivalents

Answer

Determine the guard band width for acceptance decisions

Answer

Compute the correlation coefficient between two uncertainty sources

Question 5

Guard bands in calibration decision-making are used to:

Accepted Answer

Reduce the acceptance zone to account for measurement uncertainty and control false acceptance risk

Answer

Protect calibration standards from environmental contamination

Answer

Expand the tolerance zone to reduce the number of rejected instruments

Answer

Define the physical barriers around calibration laboratory areas

Question 6

Measurement traceability in calibration means that a result can be:

Accepted Answer

Related to national or international measurement standards through an unbroken chain of comparisons with stated uncertainties

Answer

Reproduced in any laboratory without additional calibration

Answer

Verified by the instrument manufacturer at any time

Answer

Documented in the customer's quality management system

Question 7

When calibration uncertainty is evaluated using a rectangular (uniform) probability distribution, the standard uncertainty is calculated as:

Accepted Answer

Half-width of the interval divided by √3

Answer

Half-width of the interval divided by √2

Answer

Full width of the interval divided by 2

Answer

Half-width of the interval divided by √6