Which statement best defines metrology?

The science of measurement, including theory, practice, standards, instruments and methods

The study of metals and their properties

The inspection of finished products only

The manufacture of precision gauges

Why is deciding the required accuracy an objective of metrology?

So the instrument is neither inadequate nor needlessly costly

So the most accurate instrument available is always used

So that inspection can be skipped

So that all instruments have the same least count

What is the purpose of periodic calibration in metrology?

To maintain the accuracy of measuring instruments

To reduce the number of parts inspected

To change the specification of the product

To remove the need for standards

How does metrology help to minimise the cost of inspection and rejection?

By detecting defects early and finding causes of errors so the process can be corrected

By accepting all parts within a wider tolerance

By measuring only the finished products

By using only the cheapest instruments

Practice · 5 marks

Scope and objectives of metrology

Short answer

Metrology is the science of measurement covering theory and practice of measuring physical quantities with required accuracy. Its scope includes instrument calibration, establishing traceability to standards, error analysis, and inspection of dimensions and form. Objectives are to evaluate product conformity, ensure interchangeability, determine process capability, and minimize inspection costs through early defect detection.

Define metrology. Explain the scope and the main objectives of metrology in an engineering industry.

Metrology is the science of measurement. It covers the theory and practice of measuring physical quantities (length, angle, mass, time, temperature and so on) with the required accuracy, together with the standards, instruments and methods used.

Scope

Selection, design and calibration of measuring instruments and standards.
Establishing units and their traceability to national and international standards.
Study of measurement errors, uncertainty and the capability of instruments.
Inspection and testing of dimensions, form, surface finish, screw threads and gears.
Checking the geometry and accuracy of machine tools.
Supporting quality control, interchangeable manufacture and legal trade.

Objectives

To evaluate the performance of a new product or design against specification.
To determine the process capability and to select a suitable process or machine.
To decide the accuracy needed so that the instrument is neither inadequate nor needlessly costly.
To inspect raw material, components and finished products so that they are within limits and interchangeable.
To maintain the accuracy of measuring instruments by periodic calibration.
To minimise the cost of inspection and rejection by early detection of defects.
To standardise methods of measurement and to prepare gauges, drawings and specifications.
To find the causes of errors and rejected parts so that the process can be corrected.

✓ Answer checked by Claude Opus 5.5 (high effort)

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