Engineering Metrology MCQ

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• What is the deflection if mandrel (Taper shank) of working length 75 mm?
  ক

  Less than 0.65 μm

  খ

  Less than 0.75 μm

  গ

  Less than 0.85 μm

  ঘ

  Less than 0.95 μm
• What kind of surface is produced if the axis of the spindle is not parallel to the bed in horizontal direction?
  ক

  Straight

  খ

  Threaded

  গ

  Tapered

  ঘ

  Stepped
• Which of the following is not true about mandrels?
  ক

  Used in alignment test

  খ

  Mandrel between centres have has 2 reference marks

  গ

  Mandrel of large diameter made tubular

  ঘ

  Test mandrel with taper shanks has conical shanks
• Which of the following is used to test straightness of bed in the transverse direction of long beds?
  ক

  Autocollimator

  খ

  Straight edge

  গ

  Taut wire method

  ঘ

  Spirit level
• Which of the following is used to test leveling of machine bed?
  ক

  Feeler gauge

  খ

  Slip gauge

  গ

  Sensitive spirit level

  ঘ

  Mandrels
• What is the axial slip?
  ক

  Axial spindle movement

  খ

  Axial machine movement

  গ

  Axial levelling of machine

  ঘ

  Axial alignment of locating cylinder
• Which type of test is done on the main spindle of a machine?
  ক

  True running

  খ

  Alignment

  গ

  Levelling

  ঘ

  Flatness
• In which plane the test for the level of installation of the machine takes place?
  ক

  In vertical plane

  খ

  In horizontal plane

  গ

  In oblique plane

  ঘ

  In both vertical and horizontal plane
• What is the formula for relative expanded uncertainty?
  ক

  Ur = U/| y |

  খ

  Ur = U/y

  গ

  Ur = U*| y |

  ঘ

  Ur = U*2y
• Which option is not correct about coverage factor?
  ক

  It is a number which is generally larger than 1

  খ

  Range – 2 to 7

  গ

  Can be calculated by using MS excel

  ঘ

  Depends on the selected coverage probability
• Which of the following option is true for given statements about expanded uncertainty and coverage factor? Statement 1: Last calculation is the expanded uncertainty when estimating uncertainty in measurement. Statement 2: In metrology industry, the mostly used value of the coverage factor is 2.
  ক

  T, F

  খ

  F, F

  গ

  T, T

  ঘ

  F, T
• What is the value of coverage factor which is generally used in the manufacturing industry?
  ক

  2

  খ

  2.89

  গ

  3

  ঘ

  3.89
• Which table is generally used to find the coverage factor?
  ক

  Student’s T table

  খ

  F distribution table

  গ

  Wishart distribution table

  ঘ

  Tau distribution table
• What is the confidence interval for the value of coverage factor ‘2’?
  ক

  95 %

  খ

  94 %

  গ

  95.45 %

  ঘ

  94.45 %
• What is the relation of expanded uncertainty with coverage factor and combined uncertainty?
  ক

  Expanded uncertainty = Coverage factor * Combined uncertainty

  খ

  Combined uncertainty = Coverage factor * Expanded uncertainty

  গ

  Coverage factor = Combined uncertainty * Expanded uncertainty

  ঘ

  Coverage factor * Combined uncertainty * Expanded uncertainty = 1
• What is the actual definition of expanded uncertainty?
  ক

  Uncertainty of the measurement result expressed as a standard deviation

  খ

  Quantity defining an interval about the measurement result

  গ

  Evaluation method of uncertainty by the statistical analysis of series of observations

  ঘ

  Uncertainty Evaluation method by other than the statistical analysis
• Which distribution is related to U-probability distribution of Type-B evaluation of uncertainty?
  ক

  Arcsin distribution

  খ

  Binomial distribution

  গ

  Poisson distribution

  ঘ

  Bernoulli distribution
• Which of the following is not treated as Type-B uncertainty?
  ক

  Hysteresis

  খ

  Common Mode Voltage

  গ

  Nonlinearity

  ঘ

  Repeatability
• What is the sensitivity coefficient?
  ক

  It describes how sensitive the input data is

  খ

  It describes to what extent output data is influenced with variation in input data

  গ

  It describes to what extent input can change

  ঘ

  It describes to what extent input data is influenced with variation in the number of observations
• When is triangular distribution is used in a Type-B method?
  ক

  When most values are near the origin

  খ

  When most values are near the right most position of distribution

  গ

  When most values are near the left most position of distribution

  ঘ

  When most values are near the centre of distribution
• When is rectangular distribution is used in Type-B evaluation method?
  ক

  When value of measurand is equal to upper limit

  খ

  When value of measurand is equal to lower limit

  গ

  When measurand lies anywhere within the limits

  ঘ

  When no limits can be determined
• If calibration certificate state the uncertainty at Xσ (X is numerical value) and quoted uncertainty is N, then what is the value of standard uncertainty?
  ক

  X*N

  খ

  X/N

  গ

  N/X

  ঘ

  NX
• What value of uncertainty cannot be taken in a Type-B method?
  ক

  Standard uncertainty without certificate

  খ

  Resultant of previous value

  গ

  Evaluated on the basis of experience

  ঘ

  Reference value from the literature
• What is the coverage factor in a Type-B method?
  ক

  Any numerical value only

  খ

  A multiple of sigma only

  গ

  A numerical value or multiple of sigma

  ঘ

  Always equal to one
• Type-B method is a type of which evaluation approach?
  ক

  Gaussian approach

  খ

  Triangular distribution approach

  গ

  U shaped distribution approach

  ঘ

  Modern approach
• Which type of uncertainty is evaluated in Type-B Evaluation?
  ক

  When observations are taken under same conditions

  খ

  When information has possible variability of input variables

  গ

  When Information is present non continuous manner

  ঘ

  When information is available and is used as it is without any judgement
• What is the value of the degree of freedom used in evaluation by Type-A method? (Where N is the number of independent measurements of quantity)
  ক

  N

  খ

  N+1

  গ

  N-1

  ঘ

  N+2
• How can Type-A uncertainties can be quantify?
  ক

  Using quality transducer

  খ

  Using stepper motor

  গ

  Using LCR meter

  ঘ

  Using conductivity meter
• What is the equation for experimental variance used in Type-A evaluation of uncertainty? . b) σ = √. c) σ = √. d) σ = √.
  ক

  σ = √.

  খ

  (1/n-1) ∑ni=1 (xi-x’)

  গ

  (1/n-1) ∑ni=1 (xi-x’)

  ঘ

  (1/n-1) ∑ni=1 (xi-x’)
• In which guide the symbols, terms and methods used for evaluating measurement uncertainty are described?
  ক

  AUM

  খ

  SUM

  গ

  RUM

  ঘ

  GUM