Exam (elaborations)

NDT Exam Questions with 100% Verified Correct Answers

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Uploaded on October 28, 2024
Number of pages 18
Written in 2024/2025
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tomography allows me to obtain a color
in a seismic refraction survey the geophone place
in which of the following media does the velocity

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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 survey, the geophone placed at a distance of 3p (p = depth of the first layer)
from the source will record which waves first?

- Direct waves

- Refracted waves

- Reflected waves - Correct Answer - Refracted waves

In which of the following media does the velocity of P-waves propagate the fastest?

- Bricks

- Wood

- Concrete - Correct Answer - Concrete

What does the investigable depth with surface waves depend on?

- Phase velocity

- Wavelength

- Signal generation time - Correct Answer - Wavelength

In which material does a GPR survey with a 500MHz antenna provide the best resolution?

- Air

- Freshwater

- Saltwater - Correct Answer - Air

Indicate the correct order of decreasing velocity:

- P-waves - S-waves - R-waves

,- R-waves - S-waves - P-waves

- S-waves - P-waves - R-waves - Correct Answer - P-waves - S-waves - R-waves

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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