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Six Sigma Course Practice Test Q&As 4

Question: All of the following are advantages of simulation EXCEPT:
Advantages of simulation models include all of the following EXCEPT:
  Time compression
  Better understanding of the real system
  Answers what-if questions
  More realistic replication of a system than mathematical analysis
  individuals
  Consistency of models of the same system developed by different

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Consistency of models of the same system developed by different

Key Points: Due to a lack of a standardized approach, models of the system built by different individuals may differ widely.

Key components of wait line simulations include all of the following except:
  Arrival rate
  Service rate
  Scheduling blocks
  Queue structure

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Scheduling blocks

Question: An ink manufacturing company manager draws a control chart that displays a process mean. The manager is concerned that the process of ink packages assembly is inconsistent and inefficient. The control chart below shows that the process is out of control because:
  Eight points are above the center line
  Process means are too close to the LCL
  Process means are too far from the UCL
  One point is above the center line

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Eight points are above the center line

Explanation: The process is out of control because eight points are above the center line.
A process is said to be out of control if eight or more points fall on one side of the process control chart center line. The center line is designed to measure the mean of a process. If a process capability study shows that eight or more points fall on one side of the center line, it indicates that the process has shifted in its performance and the underlying cause should be investigated.

Question: Penmanship Inc. produces high quality pencils for a select group of customers. Within each production cycle of 10,000 pencils, there are two types of defects that can occur at the following rates: wrong dimensions (80 defects) and faulty eraser (45 defects). What is the Defects per Unit (DPU) measurement of this process?
  0.0575
  0.0215
  0.0275
  0.0125

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0.0125

Explanation: The DPU measurement of this process is 0.0125.

Defects per Unit or DPU is a process performance metric that calculates the defect occurrence rate depending on a production cycle or process. In this example, the total number of defects per 10,000 pencils produced = 80 + 45 = 125 defects.
The DPU = Total Number of Defects ÷ Total Number of Units
= 125 ÷ 10, 000
= 0.0125

Question: What is a balanced experiment?
  Same number of factors as levels
  Each factor level appears the same number of times
  At least one trial for all possible combinations of factors and levels
  At least two repetitions for each trial

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Each factor level appears the same number of times

Question: SIPOC provides a view of the process that contains approximately how many steps?
  6-25
  5-7
  8-15
  25-40

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5-7

Question: All of the following are disadvantages of simulation EXCEPT:
  No guarantee that the model will provide a good answer
  No way to prove that a simulation's model performance is completely reliable
  Simulation may be difficult to develop
  Required special training to become proficient
  Disrupts ongoing activities of the real system

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Disrupts ongoing activities of the real system

Key Points: Simulation does not disrupt the ongoing activities of the real system.

Question: The best process flow structure to use for making automobiles is?
  Group technology cell
  Continuous flow
  Job shop
  Assembly line
  Batch shop

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Assembly line
Key Points: An assembly line is best of making cars.

Question: The type of processing structure that is used to produce gasoline, chemicals, and steel is:
  Assembly Line
  Continuous Flow
  Job Shop
  Project
  Batch

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Continuous Flow
Key Points: Job shop produces low standardized products, batch produces multiple products and assembly line produces fewer major products. Project, on the other hand, is not a processing structure.

Question: A break even point indicates which of the following:
  The point where cost is minimized
  The point where profit is maximized
  The point where we are indifferent between two options
  The point where we are most efficient
  All of the above

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The point where we are indifferent between two options

Question: According to Hayes and Wheelwright, which of the following is not a major process flow structure?
  Batch
  Continuous Flow
  Job Shop
  Project
  Assembly Line

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Project
Key Points: A project is a type of job.

Question: Goldratt's rule of production scheduling include all but:
  Do not balance the capacity - balance the flow
  Utilization and activation of a resource is not the same thing
  An hour saved at a non-bottleneck is a mirage
  A process batch should be fixed both along its route and in time
  Priorities can be set only by examining the system's constraints

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A process batch should be fixed both along its route and in time
Key Points: According to Goldratt, a process batch should be variable (and not fixed) both along its route and in time.

Question: Desirable features of simulation software include which of the following capabilities?
I. Interactive
II. User-friendly
III. Macro functions
IV. Animation
  I only
  I and II only
  I, II, and III only
  II, III, and IV only
  I, II, III, and IV

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I, II, III, and IV
Key Points: All are desirable features of simulation software.

Question: The steps in Goldratt's Theory of Constraints problem solving approach include:
  Identify the system constraint
  Decide how to remove the system constraints
  Elevate the system constraint to highest priority
  A and B
  A and C
  A, B, and C

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A, B, and C
Key Points: All three are part of Goldratt's theory of constraints.

Question: A process flow diagram shows how parts are put together to make a product.
  TRUE
  FALSE

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FALSE
Key Points: A process flow diagram shows the steps required to make a product. An assembly diagram shows how the parts go together.

Question: An example of a business/industry that uses batch flow process structure is:
  Automobile assembly
  Heavy equipment
  French restaurant
  Sugar refinery
  Commercial printer

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Heavy equipment
Key Points: Commercial printer and French restaurants are examples of job shop. Automobile assembly uses an assembly line structure while sugar refinery uses continuous flow structure.

Question: A major process flow structure is the fabrication shop.
  TRUE
  FALSE

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FALSE
Key Points: This is not a major process flow structure.

Question: The type of processing structure that is used for producing discrete products at higher volume is:
  Continuous Flow
  Project
  Job Shop
  Assembly Line
  Batch

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Assembly Line
Key Points: Job shop produces low standardized products, batch produces multiple products and continuous flow produce is high-standardized products. Project, on the other hand, is not a processing structure.

Question: Operational measures include:
  Inventory
  Operating expenses
  Throughput
  A and B
  B and C
  A, B, and C

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A, B, and C
Key Points: All three are operational measures.

Question: RISK is an add-in program that works with Microsoft Excel and has the capability of adding many useful simulated-related functions to the spreadsheet.
  TRUE
  FALSE

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TRUE

Question: Which of the following according to Goldratt is not a component of production cycle time?
  Setup time
  Queue time
  Wait time
  Process time
  Maintenance time

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Maintenance time
Key Points: Idle time and not maintenance time is the 5th component of production cycle time.