NDT UT Level 3 Test with all Correct & 100% Verified
Answers |Actual Complete Update |Already Graded A+
In a UT test system where signal amplitudes are displayed on a CRT, an advantage of a
frequency-independent attenuator over a continuously variable gain control is that:
A) the pulse shape distortion is less
B) the signal amplitude measured using the attenuator is independent of frequency
C) the dynamic range of the system is decreased
D) the effect of amplification threshold is avoided ✔Correct Answer-B) the signal amplitude
measured using the attenuator is independent of frequency
An amplifier in which received echo pulses must exceed a certain threshold voltage before they
can be indicated might be used to:
A) suppress amplifier noise, unimportant scatter echoes, or small flaw echoes which are of no
consequence
B) provide a screen display with nearly ideal vertical linearity characteristics
C) compensate for the unavoidable effects of material attenuation loss
D) provide distance amplitude correction automatically ✔Correct Answer-A) suppress
amplifier noise, unimportant scatter echoes, or small flaw echoes which are of no consequence
The output voltage from a saturated amplifier is:
A) 180 degrees out of phase from the input voltage
B) lower than the input voltage
C) nonlinear with respect to the input voltage
D) below saturation ✔Correct Answer-C) nonlinear with respect to the input voltage
The transmitted pulse at the output of the pulser usually has a voltage of 100 to 1000V, whereas
the voltages of the echo at the input of the amplifier are on the order of:
A) 10 Volts
B) 50 Volts
C) .001 to 1 Volts
D) 1 to 5 Volts ✔Correct Answer-C) .001 to 1 Volts
The intended purpose of the adjustable calibrated attenuator of a UT instrument is to:
A) control transducer dampening
B) increase the dynamic range of the instrument
C) broaden the frequency range
D) attenuate the voltage applied to the transducer ✔Correct Answer-B) increase the dynamic
range of the instrument
Which of the following might result in increased transmission of ultrasound within a coarse-
grained material?
, A) perform the exam with a smaller diameter transducer
B) perform the exam after a grain refining heat treatment
C) change from a contact exam to an immersion exam
D) change from longitudinal to a transverse wave ✔Correct Answer-B) perform the exam after
a grain refining heat treatment
When material grain size is on the order of ____ wavelength or larger, excessive scattering of
the ultrasonic beam may affect test results.
A) 1
B) 1/2
C) 1/10
D) 1/100 ✔Correct Answer-C) 1/10
In a forging, flaws associated with nonmetallic inclusions can most accurately be described as
having which of the following orientations?
A) parallel to the major axis
B) parallel to the minor axis
C) aligned with forging flow lines
D) at approximately 45 degrees to the forging direction ✔Correct Answer-C) aligned with
forging flow lines
The preferred method of UT inspecting a complex shaped forging:
A) is an automated immersion test of the finished forging using an instrument containing a
calibrated attenuator in conjunction with a C-scan recorder
B) combines thorough inspection of the billet prior to forging with a careful inspection of the
finished part in all areas where the shape permits
C) is a manual contact test of the finished part
D) is an automated immersion test of the billet prior to forging ✔Correct Answer-B) combines
thorough inspection of the billet prior to forging with a careful inspection of the finished part in
all areas where the shape permits
In a long rod which is examined from one end with a longitudinal beam, the most likely effect of
the longitudinally-oriented discontinuities would be to:
A) significantly reduce the back surface reflection
B) cause echoes between the initial pulse and the first back surface reflection for which the
reflector locations cannot be precisely determined
C) remove or reduce the amplitude of echoes from refracted beam paths
D) cause excessive baseline noise ✔Correct Answer-C) remove or reduce the amplitude of
echoes from refracted beam paths
When maximum sensitivity is required from a transducer:
A) a straight-beam unit should be used
B) large diameter crystals are required
C) the piezoelectric element should be driven at its fundamental resonant frequency
Answers |Actual Complete Update |Already Graded A+
In a UT test system where signal amplitudes are displayed on a CRT, an advantage of a
frequency-independent attenuator over a continuously variable gain control is that:
A) the pulse shape distortion is less
B) the signal amplitude measured using the attenuator is independent of frequency
C) the dynamic range of the system is decreased
D) the effect of amplification threshold is avoided ✔Correct Answer-B) the signal amplitude
measured using the attenuator is independent of frequency
An amplifier in which received echo pulses must exceed a certain threshold voltage before they
can be indicated might be used to:
A) suppress amplifier noise, unimportant scatter echoes, or small flaw echoes which are of no
consequence
B) provide a screen display with nearly ideal vertical linearity characteristics
C) compensate for the unavoidable effects of material attenuation loss
D) provide distance amplitude correction automatically ✔Correct Answer-A) suppress
amplifier noise, unimportant scatter echoes, or small flaw echoes which are of no consequence
The output voltage from a saturated amplifier is:
A) 180 degrees out of phase from the input voltage
B) lower than the input voltage
C) nonlinear with respect to the input voltage
D) below saturation ✔Correct Answer-C) nonlinear with respect to the input voltage
The transmitted pulse at the output of the pulser usually has a voltage of 100 to 1000V, whereas
the voltages of the echo at the input of the amplifier are on the order of:
A) 10 Volts
B) 50 Volts
C) .001 to 1 Volts
D) 1 to 5 Volts ✔Correct Answer-C) .001 to 1 Volts
The intended purpose of the adjustable calibrated attenuator of a UT instrument is to:
A) control transducer dampening
B) increase the dynamic range of the instrument
C) broaden the frequency range
D) attenuate the voltage applied to the transducer ✔Correct Answer-B) increase the dynamic
range of the instrument
Which of the following might result in increased transmission of ultrasound within a coarse-
grained material?
, A) perform the exam with a smaller diameter transducer
B) perform the exam after a grain refining heat treatment
C) change from a contact exam to an immersion exam
D) change from longitudinal to a transverse wave ✔Correct Answer-B) perform the exam after
a grain refining heat treatment
When material grain size is on the order of ____ wavelength or larger, excessive scattering of
the ultrasonic beam may affect test results.
A) 1
B) 1/2
C) 1/10
D) 1/100 ✔Correct Answer-C) 1/10
In a forging, flaws associated with nonmetallic inclusions can most accurately be described as
having which of the following orientations?
A) parallel to the major axis
B) parallel to the minor axis
C) aligned with forging flow lines
D) at approximately 45 degrees to the forging direction ✔Correct Answer-C) aligned with
forging flow lines
The preferred method of UT inspecting a complex shaped forging:
A) is an automated immersion test of the finished forging using an instrument containing a
calibrated attenuator in conjunction with a C-scan recorder
B) combines thorough inspection of the billet prior to forging with a careful inspection of the
finished part in all areas where the shape permits
C) is a manual contact test of the finished part
D) is an automated immersion test of the billet prior to forging ✔Correct Answer-B) combines
thorough inspection of the billet prior to forging with a careful inspection of the finished part in
all areas where the shape permits
In a long rod which is examined from one end with a longitudinal beam, the most likely effect of
the longitudinally-oriented discontinuities would be to:
A) significantly reduce the back surface reflection
B) cause echoes between the initial pulse and the first back surface reflection for which the
reflector locations cannot be precisely determined
C) remove or reduce the amplitude of echoes from refracted beam paths
D) cause excessive baseline noise ✔Correct Answer-C) remove or reduce the amplitude of
echoes from refracted beam paths
When maximum sensitivity is required from a transducer:
A) a straight-beam unit should be used
B) large diameter crystals are required
C) the piezoelectric element should be driven at its fundamental resonant frequency
