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Measurement & Calibration Flashcards

7 cards from real CPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Measurement & Calibration flashcards as text

  1. A production technician is measuring a bore diameter with a bore gage. The bore gage must first be set using a ring gage master. This process of setting the gage to a known value is called:

    Answer: Zeroing or mastering the gage

    Mastering (zeroing) a gage means setting it to a known reference value so subsequent readings are relative to that standard.

  2. What does 'measurement uncertainty' communicate about an instrument's reading?

    Answer: A range within which the true value is expected to lie with a stated confidence level

    Measurement uncertainty quantifies the doubt about the measurement result and is typically expressed as ± a value with a specified confidence level (e.g., 95%).

  3. A 4:1 accuracy ratio (also called the Test Accuracy Ratio or TAR) between the calibration standard and the instrument being calibrated means:

    Answer: The standard is four times more accurate than the instrument being calibrated

    A 4:1 TAR means the reference standard used for calibration is at least four times more accurate than the instrument under calibration, ensuring reliable results.

  4. A CMM (Coordinate Measuring Machine) is best used for:

    Answer: Measuring complex three-dimensional geometries with high accuracy

    CMMs use a touch probe to measure X, Y, and Z coordinates, making them ideal for inspecting complex 3D geometries such as bores, angles, and profiles.

  5. Linearity error in a measurement instrument refers to:

    Answer: The difference in accuracy across the instrument's full measurement range

    Linearity is the consistency of bias across the operating range; if an instrument is accurate at low values but biased at high values, it has a linearity error.

  6. When should a calibration label be placed on a measuring instrument?

    Answer: After successful calibration to show the calibration date and next due date

    Calibration labels are applied after a successful calibration to identify the instrument's calibration date, technician, and the date the next calibration is due.

  7. A surface roughness measurement is expressed as Ra = 32 µin. In this context, Ra represents:

    Answer: The arithmetic average roughness of the surface profile

    Ra is the arithmetic mean of the absolute values of the surface profile deviations from the mean line, and is the most commonly used surface roughness parameter.