Certified Six Sigma Black Belt Exam Lean Enterprise Concepts 5

Question 1

A value stream map shows a total lead time of 10 days with 45 minutes of value-added time. What is the process cycle efficiency (PCE)?

Accepted Answer

0.31%

Answer

PCE = 45 min ÷ (10 days × 480 min/day) = 45 ÷ 4,800 = 0.9375%, which rounds to approximately 0.31% if using 1440 min/day, confirming very low efficiency typical of batch environments.

Question 2

Which lean concept describes designing and operating a manufacturing cell so that one operator can run multiple machines in sequence, following the parts?

Accepted Answer

Multi-process handling (multi-machine operation)

Answer

Multi-process handling (multi-machine operation) allows one trained operator to tend multiple machines in sequence, matching output to takt time with fewer people.

Question 3

A lean Black Belt notices that a process produces in large batches and ships weekly, causing large swings in upstream demand. Which lean strategy best addresses this?

Accepted Answer

Implement heijunka to level production by mix and volume

Answer

Heijunka (production leveling) smooths the production schedule to dampen demand volatility sent to upstream processes, reducing the bullwhip effect.

Question 4

In a lean enterprise, 'little's law' (L = λW) is used to:

Accepted Answer

Relate average WIP, average throughput rate, and average lead time

Answer

Little's Law states that average WIP (L) equals average arrival rate (λ) multiplied by average time in system (W), connecting inventory, flow rate, and lead time.

Question 5

Which statement best describes the relationship between kaizen and kaikaku in lean transformation?

Accepted Answer

Kaizen is continuous incremental improvement; kaikaku is radical or breakthrough change

Answer

Kaizen means continuous incremental improvement by all employees; kaikaku (or kaikaku kaizen) refers to radical, breakthrough redesign of a process or value stream.

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Lean Enterprise Concepts 5