Practice Test Geeks(CST) Certified Scale Technicians Practice Test
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Scale Installation & Calibration Procedures Flashcards

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

Read the first 7 Scale Installation & Calibration Procedures flashcards as text

  1. A technician is calibrating a hopper scale using the substitution method. What does this method involve?

    Answer: Using certified test weights to establish span, then replacing them with bulk material of known weight

    Substitution calibration uses certified weights to set span, then replaces them with material so the scale can be used for self-calibration checks against material weight.

  2. According to OIML R 76, what is the maximum permissible error (MPE) at initial verification for a Class III scale at 500 e?

    Answer: ±1.0 e

    For Class III scales between 50 e and 2000 e, the MPE at initial verification is ±1.0 e.

  3. A weigh-in-motion (WIM) system requires site calibration after installation. Which vehicle parameter must be controlled during the calibration pass?

    Answer: Vehicle speed must be within the specified calibration speed range

    WIM systems are speed-sensitive because dynamic load factors change with velocity; calibration passes must be made within the system's designated speed window.

  4. When leveling a bench scale using adjustable feet, which instrument is preferred to verify level?

    Answer: A precision spirit level or electronic inclinometer accurate to 0.1° or better

    Precision spirit levels or electronic inclinometers provide the accuracy needed to ensure the scale platform is within the manufacturer's tilt specification, typically ±0.5°.

  5. During installation of a tank weighing system, 'live load' isolation is achieved by:

    Answer: Using flexible conduit, hoses, and piping connections that do not transmit force to the tank

    Rigid connections to a weighed vessel introduce parasitic forces that corrupt the weight reading; flexible connections isolate the tank so only its true weight is measured.

  6. What is the function of 'check weights' (also called 'shift weights') during a floor scale calibration?

    Answer: To verify repeatability by placing and removing a known load multiple times

    Repeatability tests using shift weights confirm that the scale returns consistent readings for the same load applied multiple times.

  7. A 10,000 lb capacity scale uses 4 load cells rated at 5,000 lb each. What is the system's combined rated output if each cell is 3 mV/V?

    Answer: 3 mV/V (the system output equals one cell's output because cells are in parallel)

    Load cells wired in parallel present the same mV/V output to the indicator as a single cell because voltage is common across parallel branches.