Time-Weighted MCQ

Test your knowledge with important Time-Weighted MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Time-Weighted MCQs at Bissoy

• The EWMA chart can be used as a basis for a dynamic process-control algorithm.
  ক

  True

  খ

  False
• Which of these can be used as a forecast of where the process mean will be at the next time period?
  ক

  p-chart

  খ

  c-chart

  গ

  EWMA chart

  ঘ

  R-chart
• The Poisson EWMA has considerably better ability to detect assignable causes than Shewhart c-chart.
  ক

  True

  খ

  False
• EWMA recursion is different in the case of the EWMA charts for normal data and EWMA charts for Poisson data.
  ক

  True

  খ

  False
• “AL” in the expression of the LCL of EWMA charts for Poisson distribution, is ______
  ক

  Lower control limit factor

  খ

  Lower allowance factor

  গ

  Life Allowance factor

  ঘ

  Last Allowance factor
• EWMV is ____________
  ক

  Exponentially weighted mean variability

  খ

  Exponentially weighted moving variance

  গ

  Exponentially weighted mean variance

  ঘ

  Exponentially weighted moving variability
• EWRMS chart is sensitive to _____________
  ক

  Process mean only

  খ

  Process standard deviation only

  গ

  Neither process mean nor standard deviation

  ঘ

  Both, process mean and standard deviation
• EWRMS chart plots __________ on the control chart.
  ক

  Exponentially weighted root moving square error

  খ

  Exponentially weighted root mean square error

  গ

  Exponentially weighted root mean signal error

  ঘ

  Exponentially weighted root moving signal error
• “Si2/σ2” has an approximate __________ distribution.
  ক

  Normal

  খ

  Lognormal

  গ

  Exponential

  ঘ

  Chi-square
• Who were the first people to introduce the EWMA charts to monitor process standard deviation?
  ক

  McGregor and Harris

  খ

  Harris and Roberts

  গ

  Crowder and Roberts

  ঘ

  Harris and Roberts
• What is the initial S in EWMS stand for?
  ক

  Severity error

  খ

  Signal error

  গ

  Square error

  ঘ

  Simple error
• The EWMA charts are recommended for phase II applications as it is totally a nonparametric procedure.
  ক

  True

  খ

  False
• In the case of Shewhart charts, if the data is not according to the normal distribution, the actual in-control ARL (ARL0) will be ____________ the expected value.
  ক

  Considerably higher than

  খ

  Considerably lower than

  গ

  Equal to

  ঘ

  Almost equal to
• Which of these is not an advantage of low value of λ in the case of EWMA charts?
  ক

  Good ARL performance

  খ

  Insensitivity to the normality of the data

  গ

  Good ability to detect the larger process shifts

  ঘ

  Easy detection of small process shifts
• Which of these is not an advantage of using a Shewhart control chart with the EWMA chart?
  ক

  Detection of larger process shifts

  খ

  ARL adjustment

  গ

  Counteraction to the high signal resistance value

  ঘ

  No defects
• Who were the first persons to recommend the use of Shewhart control charts with the EWMA charts with low values of λ?
  ক

  Woodall and Mahmoud

  খ

  Woodall and Roberts

  গ

  Roberts and Mahmoud

  ঘ

  Roberts and Crowder
• Which of these methods can be used to counteract the signal resistance in case of small values of λ with EWMA charts?
  ক

  To use a cusum chart paralleled

  খ

  To use a Shewhart control chart paralleled

  গ

  To just wait for EWMA chart to be plotted till 50 observations

  ঘ

  To increase the value of process mean target
• Which of these is not having a constant SR value?
  ক

  c-chart

  খ

  R-chart

  গ

  p-chart

  ঘ

  EWMA chart
• Which of these is a having a constant SR?
  ক

  A x chart

  খ

  A Cusum chart

  গ

  An EWMA chart

  ঘ

  Every control chart
• For a Shewhart control chart, what is the value of SR?
  ক

  Zα/2

  খ

  2

  গ

  L

  ঘ

  2L
• The largest standard deviation of the sample mean from the target, not leading to an immediate out-of-control signal, is called _______________ of a control chart.
  ক

  ARL

  খ

  UCL

  গ

  Signal resolution

  ঘ

  Signal resistance
• ARL of the process, when EWMA is used, does not depend on σ.
  ক

  True

  খ

  False
• Which of these values of λ gives the weights given to current and previous observations matching as closely as possible the weights when these observations give by a Shewhart chart with the WE rules?
  ক

  0.7

  খ

  0.9

  গ

  0.2

  ঘ

  0.4
• How is the effectiveness of EWMA charts by inertia effect?
  ক

  Increase

  খ

  Decrease

  গ

  No change

  ঘ

  Can either decrease or increase
• When the value of λ is small, and if the value of EWMA is on one side of the CL and the shift of mean occurs in the opposite direction, EWMA takes several periods to react to that shift. This is called _____
  ক

  Weight effect

  খ

  Stationary effect

  গ

  Inertia effect

  ঘ

  Tendency effect
• Which of the parameters are chosen wisely in the case of EWMA charts to get a desired ARL?
  ক

  Only L

  খ

  Only σ

  গ

  Both, L and λ

  ঘ

  Only λ
• What is the center line value of the EWMA charts?
  ক

  0

  খ

  1

  গ

  x

  ঘ

  μ0
• The EWMA charts are constructed by plotting _______________ versus the sample number i or the time.
  ক

  The sample observation, xi

  খ

  The sample variance, σ2

  গ

  The variance of variable zi i.e. \(\sigma_{z_i}^2\)

  ঘ

  The variable zi
• The starting value of the variable zi is always equal to μ0.
  ক

  True

  খ

  False
• The weights of EWMA charts may also increase.
  ক

  True

  খ

  False