Take A Free ASNT NDT IR Level 3 Exam Practice Test – Quiz Course

Here you can take a free ASNT NDT IR Level 2 Exam Practice Test with the latest Infrared and Thermal Testing Method Level III Questions and Answers.

1.

The peak spectral radiance from a blackbody with a temperature of 1800 K (1526.85 °C) is:

 a. equal to that of a blackbody at 1800 °R (726.85 °C)

 b. twice that of a blackbody at 900 K (626.85 °C)

 c. less than that of a blackbody at 900 K (626.85 °C)

 d. greater than that of a blackbody at 900 K (626.85 °C)

2.

Actual surfaces frequently exhibit variable emissivities over the wavelength spectrum. These surfaces are commonly referred to as:

 a. real bodies

 b. graybodies

 c. blackbodies

 d. white bodies

3.

Radiometric imagers of what wavelength should be used for accurate surface temperature measurement of plate glass?

 a. wavelengths less than 1.0 μm

 b. wavelengths less than 4.5 μm

 c. wavelengths greater than 4.5 μm

 d. wavelengths between 1.0 and 2.4 μm

4.

The energy emitted from a piece of metal is measured and the temperature is determined to be 900 °C (1652 °F) assuming a surface emissivity of 0.79. It is later found that the true emissivity is 0.84. What is the closest temperature of the metal from the values listed below?

 a. 918 °C (1684 °F)

 b. 900 °C (1652 °F)

 c. 882 °C (1620 °F)

 d 400 °C (752 °F)

5.

Which of the following nonuniformity corrections (NUC) will best provide both uniform detector response and correct for the offset between the target signal and the detector response over the temperature range of an active pulse IR inspection?

 a. one point external

 b. one point internal

 c. two points external

 d. two-point internal

6.

Liquid-in-glass thermometers are designed and calibrated for three conditions of use. Which of the following is not a condition of use for a liquid-in-glass thermometer?

 a. suspended immersion

 b. total immersion

 c. partial immersion

 d. complete immersion

7.

Which device would be most appropriate for measuring the surface temperature of polyethylene film?

 a. a focal plane array radiometer with an InSb detector (3 to 5 μm) cooled to 77 K (-196.15 °C)

 b. a single element scanner with HgCdTe detector (8 to 12 μm) cooled to 77 K (-196.15 °C)

 c. infrared point radiometer filtered to detect 3.45 um radiation

 d. calibrated bi-metal thermometer

8.

When observing an object at 51.85 °C (325 K), which of the following detectors has the greatest detectivity (D*)?

 a. HgCdTe (8 to 12 μm) cooled to -196:15 °C (77 K)

 b. triglycene sulfate (8 to 12 μm) at ambient

 c. InSb (3 to 5 um) cooled to -196.15 °C (77 K)

 d. PtSi (3 to 5 μm) cooled to -196.15 °C (77 K)

9.

You are asked to inspect a new paper laminating process, with a long oven and stainless steel rollers, 91.44 cm (36 in.) wide. The paper is laminated with a foil, and only the foil side is visible as it curves around the stainless steel roller at the oven exit. It is important to ensure the foil temperature is uniform at the oven exit for the adhesive to cure properly. What is the best way to ensure the material is cured?

 a. view the nip between the roller and the foil with an infrared radiometric imager

 b. use a thermocouple to measure the moving foil temperature

 c. use reflective radiometry to get an accurate temperature of the foil

 d. increase the emissivity of the foil with black paint

10.

Energy is measured in units called:

 a. kelvin

 b. joule

 c. watt

 d. Rankine

11.

What is the correct value of the Stefan-Boltzmann constant?

 _{a. 5.67 x 10}^-8 _W/cm

 b. 5.67 x ₁₀^-12 W/M²

 c. 5.67 x ₁₀^-8 W/M² _{– K}¹_.

 d. 5.67 x ₁₀^-8 W/CM² _{– K}⁴

12.

Wien’s displacement law for determining the peak wavelength of emitted radiation may be expressed as:

 a. λmax 2897/T_k.

 b. λmax T_k 2897

 C. λmax 2.897/T_k

 d. λmax 289.77/T_k

13.

A change in the electrical resistance of the responsive element in an infrared detector due to temperature changes produced by absorbed, incident infrared radiation describes the:

 a. thermovoltaic effect

 b. photovoltaic effect

 c. pyroelectric effect

 d. bolometric effect

14.

The slit response method is the generally accepted method for determining IFOV measurement. What percent modulation is required to obtain an accurate temperature?

 a. greater than 90%.

 b. less than 90%

 c. 50%

 d. none of the above

15.

Thermographic stress analysis is based on which of the following effects relates dynamic changes in stress to the temperature changes they produce:

 a. thermal conductivity effect

 b. thermal diffusivity effect

 c. thermoelastic effect

 d. thermal gradient effect

16.

Vibrothermography is a non-destructive test method that involves monitoring the surface of a material with an infrared imager while the material is subjected to:

 a. forced mechanical oscillations

 b. thermal waves

 c. laser excitation

 d. sudden thermal shock

17.

Thermal radiation is strongly absorbed by water vapor in which of the following wave bands?

 a. 3.5 to 5 μm

 b. 6 to 8 μm

 c. 9 to 10 μm

 d. 10 to 12 um

18.

The responsive element of infrared detectors can be divided into what two groups?

 a. reflective detectors and emissive detectors

 b. thermal detectors and photon detectors

 c. static detectors and dynamic detectors

 d. quantitative detectors and qualitative detectors

19.

A good material for making a lens for an infrared imager is

 a. germanium

 b. graphite epoxy

 c. indium antimonide

 d. glass

20.

Heat is applied to the surface of a 0.635 cm (0.25 in.) graphite epoxy laminate. Which of the following statements is true?

 a. when heat is applied evenly over the surface, heat flow will be multidirectional into the part

 b. when heat is applied unevenly over the surface, heat flow will be one-dimensional through the part

 c. when heat is applied evenly over the surface, heat flow will be unidirectional through the part until a discontinuity is reached.

 d. when heat is applied evenly over the surface, heat flow will be multidirectional through the part until a discontinuity is reached

21.

You are asked to determine the minimum defect size (surface indication) that can be resolved using a thermal imaging system with an IFOV of 1.5 milliradians. You are following ASTM 2582-07 which requires that nine contiguous pixels are projected within the boundaries of the indication. The minimum focus distance of the thermal imager is 60.96 cm (24 in.). Assuming the surface of the component has an emissivity of 0.94, what is the minimum defect size that can be resolved using the above system?

 a. 0.0914 cm (0.036 in.)

 b. 0.1829 cm (0.072 in.)

 c. 0.2743 cm (0.108 in.)

 d. 0.9144 cm (0.36 in.)

22.

How do you know that an active pulse thermographic inspection of material had sufficient power and inspection time?

 a. using the log plot, look for a break in the straight line indicating heat hitting the back wall

 b. using full power on the flash lamps will always provide sufficient power

 c. the peak contrast plot will indicate all possible indications identified

 d. there is no way to determine sufficient power and time have been used

23.

You are inspecting a 1 in. (2.54 cm) thick aluminum panel that has been heated to 50 °C (122 °F). A small surface hole in the panel appears warmer than the smooth surface surrounding it. Why?

 a. the crack or hole has a higher emittance

 b. the surface emits less long-wave thermal radiation

 c. the reflectivity of a crack or hole equals 0.9999

 d. radiation is not emitted by aluminum surfaces

24.

What is the best surface preparation for using quartz lamps to conduct an active thermographic inspection of a composite component?

 a. optically reflective and thermally reflective

 b. optically absorptive and thermally emissive

 c. optically absorptive and thermally neutral

 d. optically reflective and thermally emissive

25.

For the purpose of thermally locating subsurface discontinuities, what is the best method of applying heat to the surface of an 8-ply carbon fiber face sheet to detect delamination between ply 1 and 2?

 a. quartz lamps

 b. hot air gun

 c. incandescent heat lamp

 d. capacitor-driven flash lamps

26.

Thermal diffusivity is proportional to:

 a. emissivity times reflectivity

 b. heat capacitance

 c. thermal conductivity divided by heat capacitance

 d. spectral bandwidth divided by responsivity

27.

You suspect that a potential defect indication in a sample may be due to a reflection from the flash lamp. What should you do to determine if the anomaly was a defect or a reflection?

 a. unless the anomaly looks like a reflection of the lamp it must be a defect

 b. rotate the part and test again – if the anomaly moves with the part it is probably a defect

 c. do a destructive analysis to see if the indication was a defect

 d. flip the part over and inspect from the back side

28.

When using a solvent to clean a test piece for thermal evaluation it is important to:

 a. be sure the solvent is dry for 5 min before the inspection begins

 b. be sure the solvent has fully evaporated

 c. be sure the piece has returned to thermal equilibrium

 d. never use solvents before thermal NDT evaluations

29.

According to ASTM E2582-07, as the depth of a flaw increases, the size of the minimum detectable flaw must:

 a. remain the same

 b. increase

 c. decrease

 d. elongate

30.

According to ASTM E2582-07, the optics and the focal plane should be sufficient so that the projection of nine contiguous pixels onto the sample plane is:

 a. greater than the minimum flaw area

 b. equal to or greater than the minimum flaw area

 c. less than the minimum flaw area

 d. less than or equal to the minimum flaw area

31.

According to ASTM E2582-07, the peak contrast time of a subsurface defect depends on which of the following:

 a. depth of the flaw

 b. orientation of the flaw

 c. size of the flaw

 d. depth and size of the flaw

32.

For high-speed imaging (in excess of 60 frames per second), which of the following detector materials is most appropriate:

 a. PtSi

 b. pyroelectric vidicon

 c. InSb

 d. mercury cadmium telluride

33.

A pyroelectric vidicon is a sensor.

 a. photon

 b. thermal

 c. bolometer

 d. thermal/pressure

34.

The minimum resolvable temperature difference is a subjective measurement that depends on the:

 a. infrared imaging systems spatial resolution only

 b. infrared imaging systems thermal sensitivity and spatial resolution measurement resolution only

 c. infrared imaging systems

 d. infrared imaging system’s minimum spot size

35.

The spatial resolution of an instrument is related to the:

 a. instantaneous field of view and the working distance

 b. thermal resolution and the system detectivity

 c. spectral bandwidth and the working distance

 d. system responsivity divided by the working distance

36.

How does temperature affect the wavelength of infrared peak emittance of an object?

 a. lower temperature objects have shorter peak emittance wavelengths

 b. higher temperature objects have shorter peak emittance wavelengths

 c. temperature variations do not affect the wavelength of the emitted radiation

 d. objects experiencing transient temperatures will emit longer waves when they are increasing in temperature and shorter waves when they are cooling

37.

Of the following contact temperature sensors, which is considered to be the most accurate sensor?

 a. RTDs

 b. thermocouples

 c. thermistors

 d. the liquid in glass thermometers

38.

Which optical property changes due to temperature changes in liquid crystals?

 a. absorptivity

 b. reflectivity

 c. transmissivity

 d. emissivity

39.

When heat is applied to an inspection surface for active nondestructive evaluation of a material, a thermogram will develop that is a function of the material, the nature of the discontinuity, the heat intensity and:

 a. the time of observation

 b. the wave band of the thermal imager used

 c. the responsivity of the thermal detector

 d. surface roughness of the material

40.

With respect to thermal nondestructive testing, an empirical rule of thumb says that the radius of the smallest detectable discontinuity should be at least as its depth under the surface.

 a. one-quarter as large

 b. one-half as large

 c. as large

 d. as large and preferably two or more times as large

41.

What is the term used to describe a thermal NDT technique where mechanical vibrations are externally induced into a structure producing heat caused by friction at discontinuities such as cracks and delaminations?

 a. ultrasonic thermography

 b. mechanically induced thermography

 c. frictionally induced thermography

 d. vibrothermography

42.

The energy emitted by an object radiates from a surface layer that is how thick.

 a. 3 to 4 μm

 b. 10 μm

 c. 100 μm

 d. 200 to 400 μm

43.

What are the two atmospheric gases that absorb transmitted radiation over the wave band of 1 to 15 μm?

 a. ozone and carbon dioxide

 b. oxygen and ozone

 c. water vapor and ozone

 d. water vapor and carbon dioxide

44.

The minimum resolvable temperature difference is a subjective measurement that depends on the infrared imaging system’s:

 a. thermal sensitivity

 b. spatial resolution

 c. detectivity (D*)

 d. thermal sensitivity and spatial resolution

45.

You are asked to choose a thermal imaging camera for a critical inspection of an aerospace component. If an anomaly is present it is expected to have a very subtle signal with an MRTD of about 75 mK. The expected surface temperature is in the vicinity of 350 K. Which of the following detectors will provide the greatest thermal contrast?

 a. vanadium oxide microbolometer 8 to 12 μm

 b. mercury cadmium telluride 8 to 12 μm

 c. lead selinide 3 to 5 μm

 d. indium antimonide 3.5 to 5 μm.

46.

When the radiant emission from a small opening in an isothermal enclosure is examined, the spectral response is found to closely approximate that of a:

 a. spectral body

 b. colored body

 c. blackbody

 d. graybody

47.

Which type of cryogenic cooling system for a photovoltaic type detector is perhaps the best choice for laboratory operation where reliability, quiet operation, and low temperature are required?

 a. joule-Thompson gas expansion using argon gas

 b. sterling cooler using helium as a coolant

 c. liquid nitrogen in a metal dewar

 d. thermoelectric coolers using the Peltier effect

48.

Which of the following thermal detectors has the highest detectivity (D*)?

 a. InSb

 b. HgCdTe

 c. pyro-electric

 d. microbolometer

49.

A material that has a flat spectral emissivity curve from 3-12 μm is considered a:

 a. graybody

 b. colored body

 c. blackbody

 d. spectral body

50.

An important and critical assumption when using two-color pyrometers is that a smooth curve exists between two variables. What are these two variables?

 a. roughness and color

 b. emissivity and wavelength

 c. emissivity and temperature

 d. spectral translucence and emissivity

51.

Compared to a thermocouple, an advantage of a resistance temperature detector (RTD) is:

 a. less expensive than a thermocouple

 b. more linear than a thermocouple

 c. wider temperature range than a thermocouple

 d. less stable than a thermocouple

52.

One of the advantages of using thermocouples for temperature measurement over a resistance temperature detector (RTD) is:

 a. thermocouples are more rugged

 b. thermocouples are more stable

 c. thermocouples are more accurate

 d. thermocouples are more linear

53.

One of the advantages of using a resistance temperature detector (RTD) over a thermocouple is RTDs:

 a. have a wide temperature range

 b. are self-powered

 c. are more accurate

 d. are more rugged

54.

The Seebeck effect is the basis for what temperature measurement device?

 a. liquid-in-glass thermometers

 b. thermocouples

 c. thermistors

 d. resistance temperature detectors

55.

You are asked to choose a surface temperature measuring device that must meet the following criteria: wide temperature range, operate in a variety of environments, simple to install, rugged, and relatively inexpensive. Which of the following devices meets your requirements the best?

 a. liquid-in-glass thermometers

 b. resistance temperature detectors

 c. thermistors

 d. thermocouples

56.

What material is used as the primary element in high-accuracy resistance thermometers?

 a. silver

 b. triglycene sulfate

 c. nickel

 d. platinum

57.

Distinguishing real temperature changes from apparent temperature changes is one of the biggest challenges facing infrared thermographers. Apparent temperature changes can be caused by differences in all of the following except:

 a. emissivity

 b. thermal diffusivity

 c. transmissivity

 d. target geometry

58.

Which spectral range will you choose to measure the temperature of an object with a temperature range of 200 to 1000 °C (392 to 1832 °F), inside a heating chamber with a glass viewing port?

 a. 2 to 3 μm

 b. 4 to 5 μm

 c. 6 to 8 μm

 d. 8 to 13 μm

59.

You are asked to measure the température of polyethelene at a temperature range 80 to 90 °C (176 to 194 °F). What waveband and with which filter will you choose to make these temperature measurements?

 a. 3.4 to 5 μm with a 3.45 μm narrow band pass filter

 b. 3.4 to 5 μm with 4.8 μm high pass filter

 c. 8 to 13 um with 7.9 μm low pass filter

 d. 8 to 13 μm with a 10.3 μm narrow band pass filter

60.

When capturing a series of thermal images that record a transient thermal event, such as occurs with pulse heating of a material to detect subsurface anomalies, most of the rapid changes in the thermal evolution curve occur in the time interval immediately following thermal excitation. It is beneficial to view the thermal images using what type of time scale?

 a. linear

 b. logarithmic

 c. exponential

 d. statistical

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