NDT Exam Questions with 100% Verified Correct Answers
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Course
Ndt
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Ndt
NDT Exam Questions with 100% Verified Correct Answers
Tomography allows me to
- Obtain a color image
- Discretize the information of the investigated space
- Produce a map of reflected events - Correct Answer - Discretize the information of the investigated space
In a seismic refraction s...
In reflection seismic surveys, geophones are positioned:
- Inside the ground roll area
- On the perimeter of the ground roll area
- Outside the ground roll area - Correct Answer - Outside the ground roll area
In a reflection seismic survey, which waves provide higher resolution?
- S-waves
- P-waves
- R-waves - Correct Answer - S-waves
Which GPR antenna allows for investigation at greater depths?
- 200MHz
- 50MHz
- 700MHz - Correct Answer - 50MHz
Which of the following statements is correct?
- P-waves are suitable for distinguishing between clay and saturated sand
- S-waves are suitable for distinguishing between dry and wet sand
- P-waves are suitable for distinguishing between clay and dry sand - Correct Answer - P-waves are
suitable for distinguishing between clay and dry sand
When conducting geoelectric measurements to investigate depth, what should I do?
- Increase the inter-electrode distance
- Maintain a constant distance between electrodes
- Bring the electrodes closer together - Correct Answer - Increase the inter-electrode distance
What is the temporal sampling frequency for a 200MHz GPR antenna?
- 200MHz
, - 300MHz
- 800MHz - Correct Answer - 800MHz
To filter direct arrivals, I can:
- Place geophones in the ground roll area
- Place geophones for both P and S waves
- Place groups of geophones at each measurement point - Correct Answer - Place groups of
geophones at each measurement point
The geometric coefficient in geoelectric measurements defines:
- The position of the electrodes (or distance)
- The transmitted electrical energy
- The measured electrical energy - Correct Answer - The position of the electrodes (or distance)
How much should be the time delay between two signals to be distinguishable?
- Less than twice the period
- At least half the period
- At least four times the period - Correct Answer - At least half the period
In tomographic measurements:
- Absorption phenomena are smaller
- Spherical divergence is irrelevant
- Multiple sources can be used simultaneously - Correct Answer - Absorption phenomena are
smaller
The dromochrones of two conjugate shots in a seismic survey have:
- The same slope
- Different slopes
- Always the same length - Correct Answer - The same slope
What is the physical principle underlying the study of surface waves?
- Total reflection of a P-wave
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