Materials Testing & Quality Assurance Flashcards
7 cards from real ETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Materials Testing & Quality Assurance flashcards as text
What is the primary function of a proof load test on a structural anchor bolt?
Answer: To verify the anchor can carry a specified load without permanent deformation
A proof load test applies a specified tensile load to the anchor bolt to confirm it sustains the load without yielding or pulling out, ensuring installation quality.
In asphalt pavement QC, what does the Marshall Stability test measure?
Answer: Resistance of a compacted asphalt specimen to deformation under load
The Marshall Stability test measures the maximum load a cylindrical asphalt specimen resists when loaded at 60°C, used to evaluate mix design strength.
A technician notices a systematic drift in all measurements from a calibrated load cell. This is most likely caused by:
Answer: A constant bias error, such as an offset in the calibration
Systematic drift or a consistent offset in all readings indicates a calibration bias error, meaning the instrument reads consistently high or low by a fixed amount.
What is the gauge length used to calculate percent elongation in a standard ASTM E8 tensile test for a 0.505-inch diameter round specimen?
Answer: 2.0 inches
ASTM E8 specifies a 2.000-inch gauge length for standard 0.505-inch diameter round tensile specimens to calculate percent elongation.
In statistical process control (SPC), an X-bar chart shows eight consecutive points all above the center line. This is known as a:
Answer: Run rule violation indicating a process shift
Eight or more consecutive points on one side of the center line is a Western Electric run rule violation, signaling a non-random process shift that requires investigation.
Which test is used to evaluate a weld procedure's resistance to hydrogen-induced (cold) cracking?
Answer: Implant test or restraint cracking test (e.g., CTS test)
Tests like the Controlled Thermal Severity (CTS) or implant test apply a sustained tensile load to a weld in a controlled hydrogen environment to assess susceptibility to cold cracking.
Per AWS D1.1, what visual acceptance criterion applies to undercut on primary structural members subject to tension stress?
Answer: Undercut shall not exceed 1/32 inch (0.8 mm) in depth
AWS D1.1 limits undercut on primary members in tension to 1/32 inch (0.8 mm) maximum depth because undercut acts as a stress concentrator in tensile zones.