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Resistance In Thermal Systems
Test Description: Principles of Technology Unit 4 Subunit 4 Review
Instructions: Answer all questions to get your test result.
1) The opposition to the flow of energy is called
A
thermal energy.
B
electrical resistance.
C
thermal resistance.
D
temperature.
2) A value that rates the quality of insulation is called
A
the R-factor.
B
the factor-label method.
C
the X-factor.
D
spring constant.
3) Which of the following would have a high thermal resistance?
A
firebrick around a furnace
B
aluminum cookware
C
radiators
D
heat sinks
4) Which of the following describes insulators?
A
are mostly metallic
B
high thermal resistance
C
heat energy passes through quickly
D
low thermal resistance
5) The average kinetic energy of all molecules in a substance is called
A
calories.
B
thermal resistance.
C
temperature.
D
heat.
6) The three factors of area, thickness, and type of material, are used to calculate what?
A
thermal energy
B
thermal resistance
C
thermal rate
D
the R-factor
7) Which has a low thermal resistance?
A
an aluminum soda can
B
refrigerated truck
C
firefighter's suit
D
dewar flask
8) When you want to keep an object hotter or colder than its surroundings, you need a
A
a low R-factor.
B
conductor.
C
low thermal resistance.
D
high thermal resistance.
9) When describing how heat moves at the molecular level, the forces holding molecules together are often compared to
A
rings.
B
tiny springs.
C
pendulums.
D
drums.
10) If an object has a high heat flow rate
A
it has a low thermal resistance.
B
it transfers heat slowly.
C
are called insulators.
D
are usually made of nonmetals.
*select an answer for all questions
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