Lean Enterprise Concepts Flashcards
7 cards from real Certified Six Sigma Black Belt Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Lean Enterprise Concepts flashcards as text
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)?
Answer: 0.31%
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.
Which lean concept describes designing and operating a manufacturing cell so that one operator can run multiple machines in sequence, following the parts?
Answer: Multi-process handling (multi-machine operation)
Multi-process handling (multi-machine operation) allows one trained operator to tend multiple machines in sequence, matching output to takt time with fewer people.
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?
Answer: Implement heijunka to level production by mix and volume
Heijunka (production leveling) smooths the production schedule to dampen demand volatility sent to upstream processes, reducing the bullwhip effect.
In a lean enterprise, 'little's law' (L = λW) is used to:
Answer: Relate average WIP, average throughput rate, and average lead time
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.
Which statement best describes the relationship between kaizen and kaikaku in lean transformation?
Answer: Kaizen is continuous incremental improvement; kaikaku is radical or breakthrough change
Kaizen means continuous incremental improvement by all employees; kaikaku (or kaikaku kaizen) refers to radical, breakthrough redesign of a process or value stream.
When applying lean in a transactional (office) environment, which of the following is the lean equivalent of 'inventory' waste?
Answer: Batches of unprocessed work items such as email queues, approval stacks, or report backlogs
In transactional processes, WIP inventory manifests as stacks of unprocessed items—emails, forms, approvals—waiting between processing steps.
A Black Belt wants to determine the number of kanban cards needed between two processes. Daily demand is 200 units, replenishment lead time is 0.5 days, safety stock factor is 10%, and each container holds 25 units. How many kanban cards are needed?
Answer: 5
Kanban cards = [demand × lead time × (1 + safety factor)] ÷ container size = [200 × 0.5 × 1.10] ÷ 25 = 110 ÷ 25 = 4.4, rounded up to 5.