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Six Sigma Course Practice Test Q&As 14

Question: Throughput time cannot be reduced in a process by:
  Reducing interruptions
  Performing activates using a serial approach
  Changing the sequence of activities
  Reducing the utilization of bottleneck equipment
  All of the above are ways by which throughput time can be reduced

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Performing activates using a serial approach

Key Points: Performing activities in parallel reduces throughput time.

Question: The most important performance dimension for product development projects is:
  Time-to-market
  Productivity
  Quality
  Product flexibility
  Product reliability
  A, B, and C

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Time-to-market

Question: The assumptions of learning curve theory include:
  The amount of time required to complete a given task will be less each time the task is undertaken.
  The unit time will decrease at an increasing rate
  The reduction in time will follow a predictable pattern
  Both A and B
  A and C
  A, B, and C

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A and C

Key Points: The unit time will decrease at a decreasing rate (rather than at an increasing rate).

Question: What would be the labor hours required for the 80th unit if the first unit took 12.5 hours and the learning rate is 80%?
  3. 05 hours
  14.5 hours
  0.31 hours
  4.56 hours
  3.8 hours

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3. 05 hours

Key Points: A is the closest answer.

Question: Which of the following is not a general guideline to improve individual performance based on learning curve?
  Motivation
  Proper training
  Proper selection of workers
  Work on all jobs simultaneously
  Allow workers to help redesign their task

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Work on all jobs simultaneously

Key Points: Learning is faster if each job is completed one at a time, rather than working on all jobs simultaneously.

Question: Which of the following is an accurate statement for an 80% learning process?
  The time for the second unit should be approximately 80% of the time required for the first unit.
  The time for the 8th unit should be approximately 64% of the time required for the second unit.
  The time for the 3rd unit is 80% of the time for the 2nd unit.
  Both A and B.
  None of the answers are correct.

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The time for the second unit should be approximately 80% of the time required for the first unit.

Key Points: The time for the 8th unit should be approximately 80% of the time required for the 4th unit. The time for the 4th (and not 3rd) unit is 80% of the time for the 2nd unit.

Question: Which of the following is not a source of improvement in learning curves?
  Employee training and education
  Changes in administration, equipment, and product design
  Work specialization
  Frequently redesigned product
  none of the above

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Frequently redesigned product

Key Points: A, B, and C are a source of improvement in learning curves

Question: In this chapter, the concept of learning curve is related primarily to:
  Labor turnover
  Output of the system over time
  Facilities layout
  Cost of inventory
  All of the above

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Output of the system over time

Key Points: Time per unit and units of output per time period are two ways to think about the improved performance that comes with learning curves.

Question: If firm experiences a learning rate of 70% and unit number 1 took 10 hours, then how many hours will unit number 9 take?
  7
  4.9
  3.23
  3.43
  none of the above

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3.23

Question: Which of the following would not be considered an input in the airline business?
  Flight crew
  Ground equipment
  Reservation personnel
  Energy in the form of fuel
  All the above are inputs

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All the above are inputs

Question: The most common things that can happen when two stages are directly linked are:
  Buffering
  Blocking
  Starving
  A and B
  B and C
  A, B, and C

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B and C

Key Points: Buffering refers to a storage area between stages where the output of a stage is placed prior to being used in a downstream stage. Buffering allows the stages to operate independently.

Question: The average time between completion of units is commonly known as:
  Throughput time
  Run time
  Cycle time
  Operation time
  None of the above

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Cycle time

Key Points: Operation time is setup time + run time, throughput time is the average time for a unit to move through the system, while run time is the time required to produce a batch of parts.

Question: A six sigma capable process will have
  Cp = 1.5, Cpk = 2.0 and DPMO = 3.4
  Cp = 2.0, Cpk = 1.5 and DPMO = 6
  Cp = 1.5 Cpk = 2.0 and DPMO = 6
  Cp = 2.0, Cpk = 1.5 and DPMO = 3.4

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Cp = 2.0, Cpk = 1.5 and DPMO = 3.4

Question: Black Belts and Master Black Belts are often tasked with conducting a closed-loop assessment of a Six Sigma methodology or project. This type of formal evaluation is done to ensure that the methodology was followed correctly and to assess its results. The following are questions that are likely asked in this assessment EXCEPT:
  what are the project’s pro-forma projections?
  how accurate were the SWOT projections?
  how were challenged and difficulties assessed?
  what new opportunities developed from the methodology?

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what are the project’s pro-forma projections?

Explanation : The following question is not asked in a closed-loop assessment: what are the project’s pro-forma projections?

Black Belts and Master Black Belts conduct closed-loop assessments of Six Sigma methodologies to make sure that all aspects have been implemented. These assessments are also used to assess whether the methodologies had led to the desired outcomes. For example, an assessment would explore whether SWOT projections were accurate and what they may have missed in the risk analysis portion of a project.

Question: With a House of Quality (HOQ), the roof is used to show:
  How the customer demands relate to the design requirements
  How the design requirements interact with each other
  The relative weight of key design requirements
  The target values

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How the design requirements interact with each other

Question: A car manufacturing company is facing a class -action lawsuit because of major brake failures. The company’s research department is especially implicated because their published research on the brake systems showed them to be within expected safety standards. The following are expectations of ethical experimentation EXCEPT:
  Presenting summaries that do not distort experiment results
  Presentation of all results - favorable and unfavorable
  Full explanation of methodologies used in research
  Exclusion of important factors that affect experiment results

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Exclusion of important factors that affect experiment results

Explanation: In ethical experimental design, all important factors that affect results should be included.

Research ethics requires researchers to include all important factors that may affect experiment results. In the example of the brake failures, researchers are obligated to include brake performance in high speeds, for example, in their design in an effort to expose potential failures.

Question: What is an example of a nominal-is-best quality characteristic?
  The time required to complete a project (from the perspective of the organization)
  The test score of this test
  The cost of a car repair (from the perspective of the car owner)
  None of the above

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None of the above

Question: Six Sigma is a fact-based, rigorous methodology in process and quality improvement that aims for defect prevention in products rather than defect detection. Six Sigma quality performance means there are ____ defects per million opportunities.
  5.1
  1.5
  3.4
  4.3

Show or Reveal the Answer

3.4

Explanation : Six Sigma quality performance means that there are 3.4 defects per million opportunities.

Six Sigma methodology provides a concrete and fact-based methodology to limit the number of defects per million opportunities such as products. The aim of implementing the methodology is to limit these defects to 3.4 which translates to a 1.5-sigma shift in the mean.

Question: The symbol for the measurement of dispersion in a population is:
  µ
  σ
  s (or sd)
  $

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σ

Question: Identify the lean enterprise technique in which the videotaping of a segment of the operation is helpful:
  TPM
  SMED
  Takt
  FIFO

Show or Reveal the Answer

SMED

Explanation : The distractor choices of inventory rotation (FIFO - first in, first out) and Talk time are fairly weak options. Total productive maintenance (TPM) could have some video tape applications. However, the best option is single minute exchange of dies (SMED). The timing of rapid die change out can really benefit from video taping the process. The tape can be run in slow motion to observe hinderances and delay areas, etc.