Statistical Process Control for Short Production Runs MCQ

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• Low type I error probability is obtained when 2-sigma limits are used for modified control chart.
  ক

  True

  খ

  False
• 2-sigma limits are recommended for the modified control charts. Which of these is not one of the reasons for this?
  ক

  The spread must be low

  খ

  The limits must be greater than the spread

  গ

  Gives smaller β-risk

  ঘ

  Gives higher β-risk
• Modified control chart design is not based upon ____________
  ক

  Type I error probability

  খ

  Sample size n

  গ

  Type II error probability

  ঘ

  Process fraction nonconforming
• When the values of δ and α are specified instead of the β and γ, what is the position of UCL of the acceptance control charts?
  ক

  Between USL and μU

  খ

  Between LSL and μU

  গ

  Between μL and USL

  ঘ

  Between μL and LSL
• When the values of n, δ, and α, are specified, the LCL of the acceptance control charts, lie in between ________
  ক

  μL And USL

  খ

  μL And LSL

  গ

  USL And μU

  ঘ

  LSL And μU
• How many approaches can be used to develop the acceptance control charts?
  ক

  2

  খ

  1

  গ

  4

  ঘ

  5
• Which of the error probability does the acceptance control chart take into account?
  ক

  Type I

  খ

  Type II

  গ

  Neither of the type I not the type II

  ঘ

  Both, type I and type II
• If the process mean increases very much, the modified control charts are not appropriate.
  ক

  True

  খ

  False
• The p-chart is the only chart to monitor the fraction of nonconforming units.
  ক

  True

  খ

  False
• A modified control charts limit expression does not contain ___________
  ক

  δ

  খ

  σ

  গ

  μ

  ঘ

  α
• Who was the first person to develop the acceptance control charts?
  ক

  Astern

  খ

  Roy

  গ

  Freund

  ঘ

  Crowder
• The approach of using a x chart to monitor the fraction of nonconforming units or the fraction of the units exceeding the specifications, is called the ___________
  ক

  Shewhart control charts

  খ

  Cusum charts

  গ

  EWMA charts

  ঘ

  Acceptance control charts
• From which chart the initial estimate of the process variability is determined?
  ক

  R-chart

  খ

  c-chart

  গ

  p-chart

  ঘ

  Cusum charts
• If there is a chance of shifting of the process variability, which chart may be used with the modified control chart?
  ক

  c-chart

  খ

  p-chart

  গ

  R-chart

  ঘ

  x̅ -chart
• If process variability shifts, the modified control charts are ____________
  ক

  Not appropriate

  খ

  Totally appropriate

  গ

  Good to use

  ঘ

  Perfect for the mapping the shifts
• To design a modified control chart, we must have a good estimate of _________ available.
  ক

  μ

  খ

  σ

  গ

  μ2

  ঘ

  process variance
• Which of the hypothesis can be tested using the modified control charts?
  ক

  μL ≤ μ ≤ μU

  খ

  μL ≤ μ

  গ

  μ ≤ μU

  ঘ

  μL = μ = μU
• ____________ sigma limits are recommended for modified control charts.
  ক

  4

  খ

  2

  গ

  3

  ঘ

  6
• If the Cpk=0.9899, the usage of modified control charts is very necessary.
  ক

  True

  খ

  False
• The six-sigma approach when implemented for a long time, the process may need modified control charts.
  ক

  True

  খ

  False
• Which of these does not say that the modified control limits must be applied?
  ক

  Cpk≫1

  খ

  Process spread is considerably small

  গ

  Natural variability becomes high

  ঘ

  Process capability becomes quite good
• Which of these is a method used when the process capability is quite high?
  ক

  Acceptance sampling

  খ

  Design of experiments

  গ

  Acceptance control charts

  ঘ

  Shewhart control charts
• Which of these is not a name of Modified control limits for x̅ charts?
  ক

  Acceptance limits

  খ

  Reject limits

  গ

  Reserve limits

  ঘ

  Liquid limits
• Which of these is used when the process has achieved high capability level?
  ক

  Trial control limits

  খ

  Actual control limits

  গ

  Modified control limits

  ঘ

  Easy control limits
• Which of these is not a purpose for which control charts are produced for?
  ক

  Control of the process

  খ

  Reduction of variability

  গ

  Increment of variability

  ঘ

  Continuous process improvement
• Which method was suggested by Del Castillo and Montgomery, to be used instead of the Q-chart to get better ARL performance?
  ক

  Kalman Filter

  খ

  Acceptance Sampling

  গ

  Design of experiments

  ঘ

  Deleting some samples completely
• Which of these charts can be used instead of Shewhart control charts, in the case of small number of subgroups used to construct the charts, which were recommended by Quesenberry?
  ক

  R-charts

  খ

  C-charts

  গ

  P-charts

  ঘ

  Q-charts
• Who was the first person to study the effect of the number of subgroups used for x bar and R chart control limit calculation on the false alarm rate?
  ক

  Hillier

  খ

  Robertson

  গ

  Wang

  ঘ

  Ricardo
• The false alarm rate is _______ when small number of subgroups is used for the Shewhart control charts.
  ক

  Decreased

  খ

  Increased

  গ

  Remains same

  ঘ

  Changed randomly
• Which of these is eliminated by the self starting approach?
  ক

  Phase I parameter estimation phase

  খ

  Phase I parameter measurement phase

  গ

  Phase II parameter estimation phase

  ঘ

  Phase II parameter measurement phase