ET ASNT level 1 Exam Questions and
Answers Graded A+
I. A test specimen used as a basis for calibrating test cquipment or as a comparison
when evaluating test results is referred to as a:
a. null-balancer
b. phase shifter .
C. reference standard
d. high pass filter - Correct answer-.C. reference standard
In an eddy current testing situation, which of the following can provide sources of
noise?
a. instrumentation electronic circuits
b. nonspecific variations within the test object
c. electrical interference
d. all of the above - Correct answer-.d. all of the above
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,3. The ratio of the response or amplitude from signals of interest to the response or
amplitude of indications that contain no useful information for the test being
conducted is referred to as:
a. Poisson's ratio
b. signal-to-noise ratio
c. the conductivity-to-permeability ratio
d. the reactance-to-resistance ratio - Correct answer-b. signal-to-noise ratio
4. IACS is a recognized abbreviation for:
a. Induced Alternating Current System
b. Inductively-Activated Comparison System
c. Internal Applied Current System
d. International Annealed Copper Standard - Correct answer-d. International
Annealed Copper Standard
Which of the following is not a basic component of eddy current equipment?
a. amplifier
b. coil
c. liquid couplant
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,d. detector - Correct answer-c. liquid couplant
The process of comparing the reading or output of an instrument, device, or dial
with a standard to determine the instrument's accuracy, capacity, or graduations is
referred to as:
a. calibration
b. differentiation
c. integration
d. phase shifting - Correct answer-a. calibration
When'conducting an eddy current test using a differential comparison coil
arrangement that compares an external reference standard with the test specimen,
the system should be nulled or balanced:
a. with only the reference standard in one coil
b. with the reference standard in one coil and an acceptable test specimen in the
other coil
c. with the reference standard in one coil and an unacceptable test specimen in the
other coil
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, d. with only the test specimen in one coil - Correct answer-b. with the reference
standard in one coil and an acceptable test specimen in the other coil
The impedance of an eddy current test coil will increase if the:
a. test frequency increases
b. inductive reactance of the coil decreases
c. inductance of the coil decreases
d. resistance of the coil decreases - Correct answer-• a. test frequency increases
Some of the products commonly tested using encircling coils are:
a. rods, tubes, and wire
b. plate when volumetrically inspected
c. sheets and metalized foil
d. al of the above - Correct answer-a. rods, tubes, and wire
Which of the following would normally be considered the best fill factor when
testing straight tubing with an encircling or feedthrough coil?
a. 0.95 (95%)
b. 1.75 (175%)
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Answers Graded A+
I. A test specimen used as a basis for calibrating test cquipment or as a comparison
when evaluating test results is referred to as a:
a. null-balancer
b. phase shifter .
C. reference standard
d. high pass filter - Correct answer-.C. reference standard
In an eddy current testing situation, which of the following can provide sources of
noise?
a. instrumentation electronic circuits
b. nonspecific variations within the test object
c. electrical interference
d. all of the above - Correct answer-.d. all of the above
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,3. The ratio of the response or amplitude from signals of interest to the response or
amplitude of indications that contain no useful information for the test being
conducted is referred to as:
a. Poisson's ratio
b. signal-to-noise ratio
c. the conductivity-to-permeability ratio
d. the reactance-to-resistance ratio - Correct answer-b. signal-to-noise ratio
4. IACS is a recognized abbreviation for:
a. Induced Alternating Current System
b. Inductively-Activated Comparison System
c. Internal Applied Current System
d. International Annealed Copper Standard - Correct answer-d. International
Annealed Copper Standard
Which of the following is not a basic component of eddy current equipment?
a. amplifier
b. coil
c. liquid couplant
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,d. detector - Correct answer-c. liquid couplant
The process of comparing the reading or output of an instrument, device, or dial
with a standard to determine the instrument's accuracy, capacity, or graduations is
referred to as:
a. calibration
b. differentiation
c. integration
d. phase shifting - Correct answer-a. calibration
When'conducting an eddy current test using a differential comparison coil
arrangement that compares an external reference standard with the test specimen,
the system should be nulled or balanced:
a. with only the reference standard in one coil
b. with the reference standard in one coil and an acceptable test specimen in the
other coil
c. with the reference standard in one coil and an unacceptable test specimen in the
other coil
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, d. with only the test specimen in one coil - Correct answer-b. with the reference
standard in one coil and an acceptable test specimen in the other coil
The impedance of an eddy current test coil will increase if the:
a. test frequency increases
b. inductive reactance of the coil decreases
c. inductance of the coil decreases
d. resistance of the coil decreases - Correct answer-• a. test frequency increases
Some of the products commonly tested using encircling coils are:
a. rods, tubes, and wire
b. plate when volumetrically inspected
c. sheets and metalized foil
d. al of the above - Correct answer-a. rods, tubes, and wire
Which of the following would normally be considered the best fill factor when
testing straight tubing with an encircling or feedthrough coil?
a. 0.95 (95%)
b. 1.75 (175%)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
