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block

A large variance of the viewing angle from the normal (90°) to a non-metallic surface of interest the emitted energy sensed.

Select the correct answer(s).  

(0/0)

---

increases linearly

has no effect on

decreases

increases exponentially

none

An opaque graybody surface with an emissivity of 0.04 would be:

Select the correct answer(s).  

(0/0)

---

almost a perfect reflector

a fairly good emitter

almost a perfect emitter

transparent to infrared radiation

none

Thermal infrared radiation occurs at wavelengths:

Select the correct answer(s).  

(0/0)

---

longer than visible light

shorter than visible light

longer than radio waves

shorter than X-rays

none

At what temperature does the emittance of thermal radiation begin?

Select the correct answer(s).  

(0/0)

---

above -460 R

at 0 °c

above 0 K

above -273 K

none

During the summer with clear sunny days, clear nights and a diurnal temperature swing from 32 °c (90 °F) to 10 °c (50 °F), a lake and the surrounding land would probably have the following thermal relationship:

Select the correct answer(s).  

(0/0)

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the land would be cooler earlier in the evening then become warmer by morning

the land would be cooler than the lake at night

the land would be warmer than the lake day and night

the land would be warmer than the lake during the daytime

none

Which of the following is not a typical pattern of an anomalous thermal image associated with wet roof insulation?

Select the correct answer(s).  

(0/0)

---

board type

amorphous

circular

picture frame

none

The ratio of the radiant emittance of a given body to that of a blackbody is defined as:

Select the correct answer(s).  

(0/0)

---

reflectivity

radiance

emissivity

transmissivity

none

Which of the following has the lowest thermal conductivity?

Select the correct answer(s).  

(0/0)

---

wood

copper

steel

aluminum

none

A quick and simple technique for improving the emissivity of highly reflective surfaces is to:

Select the correct answer(s).  

(0/0)

---

use a shorter wavelength infrared camera

apply black electrical tape to the surface

cover the surface with aluminum foil

adhere black thin film polyethelene

none

What can we say for certain about a clear piece of thin plastic?

Select the correct answer(s).  

(0/0)

---

it is opaque to infrared

it is transparent to infrared

its reflectivity is more than 1

its emissivity is less than 1

none

The radiant energy emitted by an object is a function of what power of its absolute temperature?

Select the correct answer(s).  

(0/0)

---

third power

first power

second power

fourth power

none

In an infrared roof moisture survey, what effects cause the areas of roof over wet insulation to be warmer at night than those over dry insulation?

Select the correct answer(s).  

(0/0)

---

warmer evening temperatures combined with cooler interior temperatures

lower heat capacity of water and cooler evening temperatures

increase thermal resjstance of wet insulation

high heat capacity of water and daytime insolation

none

What does IFOV stand for?

Select the correct answer(s).  

(0/0)

---

image field of view

infringing field of view

instantaneous field of view

increasing field of view

none

What are the three modes of heat transfer?

Select the correct answer(s).  

(0/0)

---

conductive, convective, radiative

temperature, thermal movement,

reflected, transmitted, emitted

absorption, emission, transmission

none

Why do a block of wood and a piece of steel at the same temperature feel so different when they come into contact with your body?

Select the correct answer(s).  

(0/0)

---

the thermal conductivity of the wood is greater

the thermal conductivity of the steel is greater

the steel is heavier than the wood

the wood is a much better emitter than the steel