Certified Six Sigma Black Belt Exam Lean Enterprise Concepts 2

Question 1

Which lean metric measures the percentage of total lead time that a product is actually being worked on (value-added time)?

Accepted Answer

Process cycle efficiency (PCE)

Answer

Process cycle efficiency = value-added time ÷ total lead time, and lean targets PCE above 25% for most processes.

Question 2

In a lean pull system, a 'signal' card used to authorize replenishment of a consumed batch from a supermarket is called a:

Accepted Answer

Withdrawal kanban

Answer

A withdrawal (move) kanban authorizes moving a container of parts from the supermarket to the consuming process.

Question 3

A facility uses 5S. After the 'Set in Order' step, what is the primary purpose of the 'Shine' step?

Accepted Answer

Clean the area and use cleaning as inspection to detect abnormalities

Answer

Shine (Seiso) involves thorough cleaning and treats cleaning as an inspection opportunity to uncover equipment or process abnormalities.

Question 4

Which of the following best describes 'heijunka' in lean production?

Accepted Answer

Leveling the production schedule by mix and volume over time

Answer

Heijunka (production leveling) smooths the production schedule across a planning period to reduce variability in demand placed on upstream processes.

Question 5

An operator at a workstation stops production and calls for help the moment a defect is detected. This lean concept is known as:

Accepted Answer

Jidoka

Answer

Jidoka (autonomation) gives machines and operators the authority to stop production when an abnormality is detected, preventing defect propagation.

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