Practice Test Geeks(NETTCP) New England Transportation Technician Certification Program Practice Test
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Quality Control Flashcards

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

Read the first 7 Quality Control flashcards as text

  1. According to AASHTO standards, what is the minimum number of compressive strength cylinders that should be cast per concrete sample?

    Answer: Two cylinders per sample

    AASHTO T 23 / ASTM C 31 typically requires at least two cylinders per test age so results can be averaged and outliers identified.

  2. What does a Proctor compaction test establish for a given soil?

    Answer: Optimum moisture content and maximum dry density

    The Proctor test (AASHTO T 99 or T 180) determines the optimum moisture content at which a soil achieves its maximum dry density under a specific compactive effort.

  3. Which property of an asphalt binder is measured by the Dynamic Shear Rheometer (DSR)?

    Answer: Viscoelastic properties including complex shear modulus and phase angle

    The DSR measures G* (complex shear modulus) and δ (phase angle), which describe an asphalt binder's stiffness and elastic behavior at service temperatures.

  4. When sampling freshly mixed concrete from a truck mixer, ASTM C 172 requires that the sample be obtained within what time period after sampling begins?

    Answer: Within 5 minutes

    ASTM C 172 requires that the composite sample be obtained within 5 minutes to ensure it represents a single batch without significant hydration changes.

  5. A QC technician receives failing density results from a nuclear gauge on a freshly compacted aggregate base course. What should be done before requesting a retest?

    Answer: Verify gauge calibration with a standard count and check moisture assumption

    Before acting on failing results, the technician should confirm the gauge is properly calibrated and that the moisture correction is accurate to rule out equipment error.

  6. What is the purpose of the Los Angeles (LA) Abrasion test for aggregate?

    Answer: To measure resistance to degradation by abrasion and impact

    The LA Abrasion test (AASHTO T 96 / ASTM C 131) measures the percentage of material lost when aggregate is subjected to impact and abrasion in a rotating drum with steel balls.

  7. In a pay factor system, what happens to the contractor's payment when the quality level (QL) of a lot falls below the target specification?

    Answer: The pay factor is reduced, resulting in a lower payment for that lot

    Pay factor systems apply a deduction factor to the contract price for lots that fall below the target quality level, incentivizing better quality control.