Electromagnetic Testing Level II Model Questions
1. A test specimen used as a basis for calibrating test equipment 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
2. In eddy current ...
1. A test specimen used as a basis for calibrating test equipment 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
2. In 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
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 ration
b. signal to noise ration
c. the conductivity to permeability ratio
d. the reactance to resistance 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
5. 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
6. The impedance of an eddy current test coil will increase if the:
a. test frequency increases
b. plate when volumetrically inspected
c. sheets and metalized foil
d. all of the above
7. An eddy current is a circulating electrical current induced in a conducting article by:
a. gamma rays
b. an alternating magnetic field
c. a piezoelectric force
d. any of the above
8. The conductivity of a material can be changed by changing the:
a. alloy of the specimen
b. heat treatment of the specimen
c. temperature
Pallakki NDT Excellence Center
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, ASNT NDT ET Level II model Questions Page 2 of 6
d. all of the above
9. In eddy current test systems where encircling coils are used, coupling efficiency is referred to as:
a. lift off
b. edge effect
c. fill factor
d. phase differentiation
10. Which of the following test frequencies would produce eddy currents with the largest depth of
penetration?
a. 100 Hz
b. 10 Hz
c. 1 MHz
d. 10 MHz
11. An eddy current test coil’s opposition to the flow of alternating current is called:
a. resistance
b. inductive reactance
c. impedance
d. capacitive reactance
12. An increase in the impedance of an eddy current test coil will:
a. cause an increase in the current flow through the test coil
b. cause a decrease in the current flow through the test coil
c. not affect current flow in the test coil
d. decrease the voltage applied to coil
13. The single absolute coil arrangement can be used in:
a. encircling coils only
b. probe coils only
c. probe and encircling coils only
d. probe, encircling, and inside diameter coils
14. Which of the following, eddy current test coil arrangements uses one area of the test specimen
as a reference standard against which another area on the same specimen is simultaneously
compared?
a. single absolute coil
b. double absolute coil
c. dc saturation coil
d. differential coil
15. The readout mechanism used when testing by the ellipse method is a:
a. meter
b. strip chart recorder
c. cathode ray tube
d. any of the above
16. A reference standard used to ensure that the amplitude and phase characteristics of an eddy
current system do not drift during continuous testing is called a:
a. DGS standard
b. calibration standard
Pallakki NDT Excellence Center
(An ISO 9001:2008 Certified Company)
# 411A, 11th Cross, 4thPhase, Peenya Industrial Area, Bangalore – 560058, Karnataka, INDIA,
www.pallakkindt.com
*For reference only. PNEC not responsible for errors and omissions in the data if any.
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