BASIC MEASUREMENT 101

If a part is measured at 0.618 and the specified dimension is 0.623 with a tolerance of ±0.005, what reasoning would you use to determine if the part is acceptable?

• The part is not acceptable because it is below the nominal value.

• The part is acceptable because it is within the tolerance range.

• The part is only acceptable if it is above 0.623.

• The part is not acceptable because it is not exactly 0.623.

What strategic steps would you take to ensure that inspection measurements are accurate and reliable in a manufacturing setting?

• Use calibrated measuring tools and follow documented procedures.

• Estimate measurements by eye.

• Only measure parts occasionally.

• Ignore the part prints.

How does the use of calibrated measuring instruments support the accuracy and reliability of inspection results, and what evidence supports this practice?

• Calibrated instruments provide consistent and accurate measurements.

• Calibration is only needed for new instruments.

• Uncalibrated instruments are just as reliable.

• Calibration is not necessary for quality control.

How can you use the concept of tolerance to balance product quality and manufacturing efficiency, and what evidence supports your approach?

• Set realistic tolerances to allow efficient production while maintaining quality.

• Use the tightest tolerances possible for all parts.

• Ignore tolerances to speed up production.

• Only use tolerances for non-critical parts.

A part fails the go gage but passes the no-go gage. What does this indicate about the part?

• The part is too small.

• The part is too large.

• The part is within tolerance.

• The part is made of the wrong material.

What is the main difference between accuracy and precision in measurement?

• Accuracy is about closeness to the true value, while precision is about repeatability.

• Accuracy is about speed, while precision is about cost.

• Accuracy is about the instrument’s size, while precision is about its color.

• Accuracy is about the instrument’s brand, while precision is about its age.

If an inspector uses a measuring device with an accuracy rating equal to the part’s tolerance, what is the risk?

• The measurements may not be reliable enough for quality control.

• The measurements will always be perfect.

• The instrument will last longer.

• The part will be cheaper to produce.

A component is measured at 0.627 and the specified dimension is 0.630 with a tolerance of ±0.004, what reasoning would you use to determine if the component is acceptable?

• The component is not acceptable because it is below the nominal value.

• The component is acceptable because it is within the tolerance range.

• The component is only acceptable if it is above 0.630.

• The component is not acceptable because it is not exactly 0.630.

What is the effect of human error on measurement precision?

• It can greatly reduce the repeatability of measurements.

• It makes the instrument more accurate.

• It has no effect on measurements.

• It increases the cost of the instrument.

A student hits the bullseye once and then hits different spots on the target in subsequent tries. What does this demonstrate?

• High accuracy, high precision

• High accuracy, low precision

• Low accuracy, high precision

• Low accuracy, low precision