Question

What value of uncertainty cannot be taken in a Type-B method?

(a) Standard uncertainty without certificate

(b) Resultant of previous value

(c) Evaluated on the basis of experience

(d) Reference value from the literature

The question was posed to me in an internship interview.

My query is from Type B Evaluation of Standard Uncertainty in section Evaluating Uncertainty in Measurement of Engineering Metrology

Answer 1

Right answer is (a) Standard uncertainty without certificate

Best explanation: The value of uncertainty may be taken from a reference value from the literature, a resultant value of a previous measurement, using the standard uncertainty for which calibration certificate is available or could be evaluated on the basis of experience.