Quality Control & Process Improvement Flashcards

The '5 Whys' technique is applied after a mini excavator strikes an unmarked utility line. What is the goal of this technique?

Answer: To identify the root cause by repeatedly asking why each failure occurred

The 5 Whys method drills down through layers of symptoms to uncover the underlying root cause, enabling a permanent fix rather than a surface-level correction.

Which of the following best describes a 'benchmark' in the context of mini excavator quality control?

Answer: A performance standard derived from the best-known practice or competitor used as a comparison target

In quality management, a benchmark is a reference standard — often the best observed performance — against which current performance is measured.

An operator records bucket breakout force readings that are within spec on Monday but below spec by Friday with no operator change. The PDCA response should begin with:

Answer: Plan — analyzing data to hypothesize why force is dropping through the week

PDCA begins with Plan, which involves gathering and analyzing data to form a hypothesis before any corrective action is taken.

What does 'first-pass yield' measure in an excavation quality context?

Answer: The percentage of excavated sections that meet specifications without requiring rework

First-pass yield is the proportion of work completed correctly the first time, without rework or correction, making it a key quality efficiency metric.

A quality circle composed of mini excavator operators meets weekly to discuss process improvements. Who typically leads such a group?

Answer: Front-line workers or a peer-elected team leader from among the operators

Quality circles are voluntary, worker-led groups where front-line employees identify, analyze, and solve problems related to their own work.

Which measurement approach helps ensure a mini excavator's swing arc stays within a safe, project-specified zone consistently?

Answer: Statistical process control using recorded swing angle data over multiple shifts

Statistical process control tracks swing arc data over time to detect drift before it becomes a safety or quality violation.

A mini excavator operator is asked to contribute to an FMEA (Failure Mode and Effects Analysis) for their machine. What information does the operator most valuably provide?

Answer: First-hand observations of how and when failures occur during normal operation

Operators provide unique insight into real-world failure modes experienced during daily use, which formal engineering documents often do not capture.