Concrete Technology Questions and Answers – Pulse Velocity Test

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Pulse Velocity Test”.

1. An ultrasonic pulse velocity test is an _____________
a) Ex-situ, nondestructive test
b) In-situ, nondestructive test
c) Ex-situ, destructive test
d) In-situ, destructive test

Explanation: An ultrasonic pulse velocity test is an in-situ, nondestructive test to check the quality of concrete and natural rocks.

2. In this test, the strength and quality of concrete or rock is assessed by measuring the ___ of an ultrasonic pulse.
a) Length
b) Velocity
c) Weight
d) Surface Tension

Explanation: In this test, the strength and quality of concrete or rock is assessed by measuring the velocity of an ultrasonic pulse passing through a concrete structure or natural rock formation.

3. Higher velocities indicate __________
a) Good quality and continuity of the material
b) Bad quality and continuity of the material
c) Concrete with many cracks
d) Concrete with many voids

Explanation: Higher velocities indicate good quality and continuity of the material, while slower velocities may indicate concrete with many cracks or voids.

4. Slower velocities may indicate ___________
a) Good quality and continuity of the material
b) Good quality and discontinuity of the material
c) Bad quality and continuity of the material
d) Concrete with many voids

Explanation: Slower velocities may indicate concrete with many cracks or voids, while higher velocities indicate good quality and continuity of the material.

5. Mechanical pulse having an oscillation frequency in range of `_____________
a) 30 kHz to 40 kHz
b) 40 kHz to 50 kHz
c) 50 kHz to 60 kHz
d) 60 kHz to 70 kHz

Explanation: Mechanical pulse having an oscillation frequency in range of 40000 Hz to 50000 Hz.

6. The number of cylces per second is the definition of ____________
a) Wave speed
b) Frequency
c) Hertz
d) Velocity

Explanation: One hertz (Hz) stands for one cycle per second and it is the SI unit of frequency. Velocity means displacement covered per second.
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7. A discontinuity that occurs during the casting of molten metal which may be caused by the splashing, surging, interrupted pouring is ___________
a) Burst
b) Cold shut
c) Flaking
d) Blow hole

Explanation: A discontinuity that occurs during the casting of molten metal which may be caused by the splashing, surging, interrupted pouring, or the meeting of two streams of metal coming from different directions is called cold shut.

8. When the motion of the particles of a medium are at right angles to the direction of wave motion, the wave being transmitted is called a ___________
a) Longitudinal wave
b) Shear wave
c) Surface wave
d) Lamb wave

Explanation: When the motion of the particles of a medium are at right angles to the direction of wave motion, the wave being transmitted is called a longitudinal wave.

9. A second name for compression wave is __________
a) Longitudinal wave
b) Shear wave
c) Surface wave
d) Lamb wave

Explanation: Lamb waves are similar to longitudinal waves, with compression and rarefaction, but they are bounded by the sheet or plate surface causing a wave-guide effect.

10. The interference field near the face of a transducer is often referred to as the ______________
a) Fresnel zone
b) Acoustic impedance
c) Exponential field
d) Phasing zone

Explanation: Radio frequency line of sight is defined by Fresnel Zones which are ellipse shaped areas between any two radios.

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