Lean Six Sigma Green Belt Certification Core Lean Principles 4

Question 1

What is Mura in Lean, and how does it differ from Muda?

Accepted Answer

Mura is unevenness or variability in flow; Muda is waste that adds no value

Answer

Mura describes unevenness or inconsistency in workflow (e.g., feast-and-famine production cycles), while Muda refers specifically to non-value-adding activities.

Question 2

A Lean team uses a heijunka box to schedule work. What problem is heijunka designed to solve?

Accepted Answer

Unevenness (Mura) in production by leveling type and volume

Answer

Heijunka (production leveling) smooths production volume and mix over time to reduce the peaks and valleys that create Mura and downstream stress.

Question 3

Which Lean principle directly addresses why a pull system is preferred over a push system?

Accepted Answer

Produce only what the customer pulls, eliminating overproduction

Answer

A pull system produces goods in response to actual customer demand, which directly prevents overproduction — the most harmful of the eight wastes.

Question 4

During a kaizen event, a team reduces changeover time from 90 minutes to 12 minutes. Which Lean tool did they most likely use?

Accepted Answer

SMED (Single-Minute Exchange of Die)

Answer

SMED is specifically designed to reduce equipment changeover or setup times, enabling smaller batch sizes and greater production flexibility.

Question 5

In value stream mapping, what symbol typically represents a 'push' arrow between processes?

Accepted Answer

A striped or wavy push arrow

Answer

In VSM convention, a striped push arrow indicates that material is being pushed forward by the upstream process rather than pulled by downstream need.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Core Lean Principles 4