Metrology

When a set of readings of a measurement has a wide range, it indicates

• high precision

• high accuracy

• low precision

• low accuracy

The difference between the lower and higher values that an instrument is able to measure is called

• accuracy

• sensitivity

• range

• error

When determining the uncertainty for a particular measurement device, the common uncertainty factors that should be included are

• errors in the measurement technique and method

• random variability of the measurement process

• technician’s error

• all of these

The aim of calibration is to

• meet customer requirement

• detect deterioration of accuracy

• comply with ISO 9000 standard requirements

• practise measurement procedures

Which of the following defines parallax error?

• Same as observational error

• Apparent shift of an object when the position of the observer is altered

• Error caused by the distance between the scale and the measured feature

• Mean of the values of measurements when the object is observed from the right and from the left

The best way to eliminate parallax error is to

• use a magnifying glass while taking measurements

• use a mirror behind the readout pointer or indicator

• centre the scale along the measured feature

• take consistent measurements from one side only

Which of the following errors is eliminated or minimized by zero setting adjustment on a dial indicator?

• Parallax error

• Inherent error

• Alignment error

• Computational error

The best standard characteristic when calibrating an instrument for production inspection is

• ten times the accuracy

• new and seldom used since calibration

• permanently assigned to this particular instrument

• using a standard similar in size, shape, and material, with part being measured

Interpretation of repeated measurement results on the same feature is considered the instrument’s

• accuracy

• precision

• range

• sensitivity

When a steel rule is used, which of the following is the source of measurement uncertainty?

• Inherent instrument error, temperature error, and manipulative error

• Attachment error, manipulative error, and temperature error

• Attachment error, bias, and inherent instrument error

• Inherent instrument error, manipulative error, and observational error