CHAPTER 1 INTRODUCTION TO ENGINEERING METROLOGY

What is Metrology?

• The study of meteorology

• The art of manufacturing precision tools

• The scientific study of measurement

• A method of controlling factory machines

Which of the following best describes Scientific Metrology?

• Measurement in legal disputes

• Calibration of shop floor equipment

• Establishment of units and standards

• Use of measuring tools in commerce

What does the term Traceability in metrology refer to?

• Measuring a trace of electricity

• Comparing your result with others

• Linking measurements to international standards

• Tracing the movement of measuring tools

Which of the following is an example of a measurement that is precise but not accurate?

• 10.0 mm using a steel ruler

• 10.05 mm using a caliper

• 9.5 mm using micrometer

• 10.000 mm using micrometer

What is Bias in a measurement process?

• Errors caused by poor tools

• The ability of a tool to repeat measurements

• Difference between average reading and true value

• Random variation in readings

Which of the following is the best definition of Uncertainty in measurement?

• The degree to which results fluctuate

• The inability to trust tools

• A measure of the goodness of the measurement

• Error caused by temperature

What is the purpose of Calibration?

• To clean the instruments

• To improve visual magnification

• To test human error

• To adjust instruments to known standards

What is the Rule of 10 in selecting measuring instruments?

• Use instruments 10 times more precise than tolerance

• Use 10 people to measure

• Measure 10 times faster

• Replace tools every 10 days

Which of the following is a factor that affects measurement processes?

• Political opinions

• Operator’s clothing

• Human variation

• Internet speed

What is the difference between Direct and Indirect measurement?

• Direct uses comparison; indirect does not

• Direct measures directly against scale; indirect uses transfer tool

• Direct uses intermediary tools; indirect does not

• Indirect gives faster results than direct