Slide-1

Question 1

Definition of measurement?

Answer 1

The process of determining the ratio of a physical quantity to a unit of measurement.

Question 2

How are standards chosen?

Answer 2

Based on some material standard or natural phenomenon that include physical and atomic consants

Question 3

Name a few historic time measurement techniques

Answer 3

Calendars, Sundials, temple structures, clepsydra (Water clock), Hourglass, Pendulum clock

Question 4

What are the types of standards?

Answer 4

Primary, Secondary and working standards

Question 5

Secondary standard

Answer 5

Employed by industrial laboratories as basic reference standards.
These are:
1. Periodically calibrated against primary standards.
2. Available for ordinary users for calibration of working standards.

Question 6

Working Standard

Answer 6

Devices available commercially:
They have been checked and verified against primary standards. eg: precision gauge block for Steel
2. Standard resistor

Question 7

Calibration

Answer 7

Calibration is the act of quantitative comparison of a known standard and the output of a measuring system of the same quantity.

Question 8

What is determined by calibration

Answer 8

Scale of measuring system

Question 9

single and multiple point calibration

Answer 9

Systems with LINEAR response require single point calibration.
Systems with NON-linear response require multiple point calibration.

Question 10

Traceability of a calibration device

Answer 10

The term measurement traceability is used to refer to an unbroken chain of comparisons relating an instrument’s measurements to a known standard.