MMET 402 UT EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
A 6 dB change in the measured ultrasonic signal strength indicates that the sound intensity
changed by a factor of: - ANS Two
A calibration block produced by the International Institute of Welding is called" - ANS An IIW
block
A decibel is: - ANS A logarithmic unit that describes a ratio of two measurements
Angle beam transducers and wedges are typically used to introduce a: - ANS Shear wave into
the part
As frequency increases, sound tends to: - ANS Scatter more from large or course grain
structure
Beam spread is greater when using: - ANS Low frequency transducers
Contact transducers are used for direct contact inspections, and are generally: - ANS Hand
manipulated
Contact transducers often incorporate a: - ANS Wear plate
@2026/2027 ALLRIGHTS RESERVED.
, Couplant displaces the ____ and makes it possible to get more sound energy into the test
specimen. - ANS Air
In order to have a reasonable chance at detecting a discontinuity, the reflective surface of the
discontinuity must have a dimension that is at least as long as ____ wavelength. - ANS One-
half
Less damped transducers will exhibit: - ANS A narrow frequency range
Longitudinal waves are also called: - ANS Pressure waves and Compressional waves
Mode conversion, occurs when a sound wave encounters an interface between materials of
different acoustic impedance and: - ANS The incident angle is not normal to the interface
Resolution generally increases: - ANS With an increase in transducer frequency
Shear waves do not propogate in: - ANS Gases and Liquids
Snell's Law describes the relationship between the sound velocity and: - ANS The refracted
angle of the wave and The reflected angle of the waves
The active element of most acoustic transducers used today is: - ANS Piezoelectric ceramic
The ability to locate a small discontinuity is called: - ANS Sensitivity
The ability to locate discontinuities that are close together within the material is called: -
ANS Resolution
The act of evaluating and adjusting the precision and accuracy of the measurement equipment
is called: - ANS Calibration
@2026/2027 ALLRIGHTS RESERVED.
ANSWERS 2026 VERIFIED.
A 6 dB change in the measured ultrasonic signal strength indicates that the sound intensity
changed by a factor of: - ANS Two
A calibration block produced by the International Institute of Welding is called" - ANS An IIW
block
A decibel is: - ANS A logarithmic unit that describes a ratio of two measurements
Angle beam transducers and wedges are typically used to introduce a: - ANS Shear wave into
the part
As frequency increases, sound tends to: - ANS Scatter more from large or course grain
structure
Beam spread is greater when using: - ANS Low frequency transducers
Contact transducers are used for direct contact inspections, and are generally: - ANS Hand
manipulated
Contact transducers often incorporate a: - ANS Wear plate
@2026/2027 ALLRIGHTS RESERVED.
, Couplant displaces the ____ and makes it possible to get more sound energy into the test
specimen. - ANS Air
In order to have a reasonable chance at detecting a discontinuity, the reflective surface of the
discontinuity must have a dimension that is at least as long as ____ wavelength. - ANS One-
half
Less damped transducers will exhibit: - ANS A narrow frequency range
Longitudinal waves are also called: - ANS Pressure waves and Compressional waves
Mode conversion, occurs when a sound wave encounters an interface between materials of
different acoustic impedance and: - ANS The incident angle is not normal to the interface
Resolution generally increases: - ANS With an increase in transducer frequency
Shear waves do not propogate in: - ANS Gases and Liquids
Snell's Law describes the relationship between the sound velocity and: - ANS The refracted
angle of the wave and The reflected angle of the waves
The active element of most acoustic transducers used today is: - ANS Piezoelectric ceramic
The ability to locate a small discontinuity is called: - ANS Sensitivity
The ability to locate discontinuities that are close together within the material is called: -
ANS Resolution
The act of evaluating and adjusting the precision and accuracy of the measurement equipment
is called: - ANS Calibration
@2026/2027 ALLRIGHTS RESERVED.
