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Technical Measurements 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 Technical Measurements flashcards as text

  1. An EDM has a stated accuracy of ±(2 mm + 2 ppm). What is the expected error for a 1,500 m distance?

    Answer: ±5 mm

    2 mm + (2 × 1.5) mm = ±5 mm.

  2. Using the wrong prism constant in the total station produces what kind of error?

    Answer: A constant systematic error in every distance

    A wrong prism offset adds the same fixed amount to every measured distance.

  3. EDM atmospheric (ppm) corrections are based mainly on:

    Answer: Temperature and barometric pressure

    Temperature and pressure change the air's refractive index, which affects the signal's speed.

  4. A rectangular parcel measures 330 ft by 132 ft. What is its area?

    Answer: 1.0 acre

    330 × 132 = 43,560 sq ft, which is 1 acre.

  5. Each of 4 tape lengths has a random error of ±0.02 ft. What is the expected total random error?

    Answer: ±0.04 ft

    Random errors add as ±0.02√4 = ±0.04 ft.

  6. A traverse with a 2,500 ft perimeter has a linear misclosure of 0.25 ft. What is its precision ratio?

    Answer: 1:10,000

    2,500/0.25 = 10,000, so the precision is 1:10,000.

  7. Recording a rod reading of 5.37 as 5.73 is classified as a:

    Answer: Blunder (mistake)

    Transposing digits is a human mistake, not a measurement error, and must be found and removed.