Practice Test Geeks(CWT) Certified Weighing Technician Practice Test
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Weighing Equipment Operation & Calibration Flashcards

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

Read the first 7 Weighing Equipment Operation & Calibration flashcards as text

  1. What is 'hysteresis' in the context of load cell performance?

    Answer: The difference in output between loading and unloading at the same applied load

    Hysteresis is the phenomenon where a load cell gives slightly different outputs for the same applied load depending on whether the load is increasing or decreasing.

  2. According to NIST Handbook 44, what is the maximum allowable tolerance for a Class III commercial scale (e.g., a retail grocery scale) at 500 scale divisions?

    Answer: 1 division

    For Class III devices, NIST HB 44 specifies a maintenance tolerance of ±1 division (d) for loads up to 500d.

  3. A moisture analyzer uses an internal balance mechanism combined with a drying heater. To ensure weighing accuracy, the instrument should be:

    Answer: Leveled and allowed to warm up per manufacturer specifications before use

    Moisture analyzers contain sensitive internal balances that require proper leveling and thermal stabilization before accurate measurements can be made.

  4. A forklift scale (on-board weighing system) shows erratic readings when the forklift engine is running. The most likely cause is:

    Answer: Electromagnetic interference or vibration from the engine affecting load cell signals

    Engine vibration and EMI from ignition/alternator systems are common sources of signal noise in on-board vehicle weighing applications.

  5. Which of the following correctly describes the relationship between 'accuracy class' and 'number of scale intervals (n)' for a weighing instrument?

    Answer: Higher accuracy class instruments are permitted more scale intervals (finer resolution) relative to capacity

    OIML and NIST classify weighing instruments such that higher accuracy classes (I, II) are permitted more scale intervals than lower classes (III, IIII), reflecting their superior resolution capability.

  6. When a CWT technician seals a legally approved scale after calibration, the seal primarily serves to:

    Answer: Prevent unauthorized adjustment of the metrological parameters

    Official seals prevent tampering with calibration adjustments and provide evidence of unauthorized access, protecting the integrity of legal-for-trade measurements.

  7. During a calibration of a belt conveyor scale, the technician should apply test loads using:

    Answer: A simulated load or a weigh-belt test using certified material or chain weights traveling at operating speed

    Belt conveyor scales must be tested dynamically — with material or calibrated chain weights moving at operational belt speed — because their accuracy depends on motion-related factors.