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