Thermography Basic Test

The NACBI / Infraspection Institute Basic Thermography Exam

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Basic Thermography Exam

Begin the NACBI Basic Thermography Exam.

This exam is intended to test general level I and Building Thermography Knowledge.
The exam is 50 questions and is not timed.
Passing grade is 80% or above correct answers. A skipped or omitted answer will be counted as incorrect.
You may take this exam as many times as you wish.
Results will be sent to and graded by an NACBI administrator.

1. __________ thermography involves temperature measurement:

a. Qualitative

b. Quantitative

c. Spatial

d. None of the above

2. Thermal imagers detect __________ across the surface of an object:

a. R-Value

b. U-Value

c. light absorption

d. thermal patterns

3. Thermal imagers can see through __________:

a. spandrel glass

b. drywall

c. metal

d. None of the above

4. Thermal imaging __________ require contact with the object being tested:

a. does

b. does not

c. may

d. None of the above

5. The required conditions for an infrared inspection will vary depending __________:

a. upon the object being inspected

b. the type of sought after defect

c. both a and b

d. None of the above

6. Heat always flows from a __________ object:

a. hotter to a colder

b. colder to a hotter

c. smaller to a larger

d. All of the above

7. __________ equilibrium is defined as two objects at the same temperature:

a. Thermal

b. Physical

c. Spatial

d. All of the above

8. __________ is defined as heat transfer through or between solids:

a. Conduction

b. Convection

c. Radiation

d. Emittance

9. __________ is defined as heat transfer by a fluid:

a. Conduction

b. Convection

c. Radiation

d. Emittance

10. __________ is defined as heat transfer by electromagnetic wavelengths:

a. Radiation

b. Conduction

c. Convection

d. Emittance

11. __________ heat transfer is the only heat transfer mode directly sensed by IR equipment:

a. Radiant

b. Conductive

c. Convective

d. None of the above

12. __________ refers to how well an object radiates infrared energy:

a. Capacitance

b. Conductivity

c. Reflectivity

d. Emissivity

13. Emittance of an object is affected by __________:

a. object temperature

b. viewing angle

c. surface condition

d. All of the above

14. __________ surfaces efficiently radiate infrared energy:

a. Shiny metal

b. High emittance

c. Low emittance

d. All of the above

15. Infrared radiation can be __________:

a. reflected

b. emitted

c. transmitted

d. All of the above

16. R+T+E= ______:

a. 1.0

b. 10.0

c. 100.0

d. 98.2

17.__________ is defined as the measure of how well an object radiates infrared energy when compared to a blackbody at the same wavelength and temperature:

a. Emittance

b. Reflectance

c. Transmittance

d. Solar loading

18. It is easier to detect small delta-T's when object emittance is:

a. unknown

b. fixed

c. high

d. low

19. Object color __________ emittance:

a. affects

b. does not affect

c. determines

d. both a and c

20. When T = 0 for an object, the formula for calculating reflectance is::

a. R=10+E

b. R=1+E

c. R=10-E

d. R=1-E

21. Infrared wavelengths are __________ visible light:

a. longer than

b. shorter than

c. the same as

d. None of the above

22. For thermal imaging, a __________ viewing angle is preferred:

a. shallow

b. perpendicular

c. 10-degree

d. 45-degree

23. For thermal imaging, clear focus __________:

a. is of paramount importance

b. is of no importance

c. can never be achieved

d. both b and c

24. __________ is the most important criteria for selecting an infrared imager:

a. Price

b. Size

c. Performance

d. Brand

25. For thermal imagers, __________ always indicates the hottest temperature in any thermal image:

a. white

b. red

c. black

d. None of the above

26. For optimum imaging, a thermal imager's lens should be __________:

a. partially obstructed

b. clean and unobstructed

c. chilled to below dew point temperature

d. protected with a lens cap

27. The typical thermal signature of a loose or deteriorated electrical connection is __________:

a. heat localized to the affected connection

b. a conductor that is uniformly warm throughout its entire length

c. a conductor that is uniformly cold throughout its entire length

d. None of the above

28. An overloaded electrical conductor is characterized by:

a. localized heating at a mechanical connection

b. a conductor that is uniformly warm throughout its entire length

c. a conductor that is uniformly cold throughout its entire length

d. None of the above

29. A properly completed report should contain __________ necessary in order to duplicate an infrared inspection in the future:

a. some of the data

b. none of the data

c. all of the data

d. None of the above

30. Defects or __________ in insulated systems usually allow excess energy loss at the point of defect:

a. latent moisture

b. solar reflection

c. excessive R-value

d. All of the above

31. For building envelope inspections, thermal data __________:

a. cannot be verified by independent means

b. should always be verified by independent means

c. never needs to be verified by independent means

d. Both a and c

32. Low E glass __________ than standard window glass:

a. transmits infrared energy more readily

b. does not transmit infrared energy more readily

c. is cheaper

d. both a and c

33. When performing an infrared inspection of structures, vantage point for the inspection is __________:

a. extremely important for collecting accurate data

b. not important at all

c. always from the exterior of the building

d. always from the interior of the building

34. For a building under natural conditions, evidence of air infiltration will be best detected by imaging exterior walls from the __________ of the building at lower elevations:

a. interior

b. exterior

c. rear

d. front

35. A blower door may be used to temporarily __________ a structure during an infrared inspection:

a. pressurize

b. depressurize

c. a or b

d. None of the above

36. Inspecting at night can eliminate errors due to:

a. solar loading

b. solar reflection

c. surface moisture

d. both a and b

37. In order to detect air leaks, structures under positive pressure should be inspected __________:

a. from the exterior

b. from the interior

c. from the North elevation only

d. when winds exceed 30 mph

38. Insulation __________ conduction losses by having low thermal conductivity:

a. eliminates

b. increases

c. decreases

d. None of the above

39. The R-value rating on insulation describes its __________ to the flow of heat:

a. radiance

b. reflectance

c. resolution

d. resistance

40. Compressing air-filled insulations such as glass fiber insulation _________ their R-value:

a. increases

b. decreases

c. does not affect

d. None of the above

41. When performing an infrared inspection of an insulated structure, excess energy loss may be caused by __________:

a. framing members

b. missing insulation

c. latent moisture

d. All of the above

42. When inspecting an insulated building sidewall from the interior during cold weather conditions (cold outside, warm inside), the thermal signature of a properly insulated wall is _________:

a. warm vertical lines and cold stud cavities

b. cold vertical lines and warm stud cavities

c. the wall looks uniformly warm

d. the wall looks uniformly cold

43. Stone or brick facades on buildings __________ conducted from the exterior of the building:

a. have no effect on the accuracy of infrared inspections

b. will improve the accuracy of infrared inspections

c. may preclude accurate infrared inspections

d. None of the above

44. Conduction energy loss may be due to:

a. air leaks

b. missing insulation

c. water entrapment

d. both b and c

45. A typical signature of air infiltration is amorphous or finger-like shapes on walls around __________:

a. doors

b. windows

c. electrical switches and receptacles

d. All of the above

46. According to the Infraspection Institute Standard for Infrared Inspection of Buildings Envelopes, an inside/outside temperature differential of __________ for a period of 3 hours is recommended for an energy loss inspection:

a. 5Cº

b. 10Cº

c. 20Cº

d. 20Fº

47. A blower door may be used to enhance __________ during an infrared inspection:

a. conductive energy loss

b. emissivity

c. insulation R-Value

d. air leakage

48. The ideal location for detecting latent moisture in EIFS is from the __________ of a building:

a. interior

b. exterior

c. attic space

d. basement or crawlspace

49. Thermal anomalies in building sidewalls may be caused by:

a. improper design

b. defective construction

c. latent moisture

d. All of the above

50. Wet insulation conducts __________ energy than dry insulation:

a. less

b. more

c. no more

d. one-third less

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Thermography Basic Test