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Rate In Thermal Systems
Test Description: Principles of Technology Unit 3: Rate Subunit 4: Thermal Systems
Instructions: Answer all questions to get your test result.
1) Which of the following helps to automatically control heat flow?
A
on-off switch
B
thermostat.
C
fan speed
2) Heat flow rate is measured in the units
A
cal/sec or BTU/hr.
B
degrees celsius
C
BTU/gpm
D
degrees celsius per seconds
3) Latent heat
A
is the heat needed to lower the temperature of the object.
B
is the heat needed to raise the temperature of an object.
C
is the heat needed to cause a change of state.
D
is the heat capacity of a substance.
4) The specific heat of water (1 calorie per gram celsius degree) is considered to be
A
a low value.
B
a high value.
C
a mid-range value.
D
of no importance.
5) In the equation for heat flow rate (Qh = (kAО”T)/L), the "k" value represents the
A
latent heat.
B
thermal conductivity.
C
specific heat.
D
coefficient of friction.
6) When does heat stop flowing?
A
when one side of the system is double that of the other side
B
when the temperatures are equal on both sides of the system
C
when the temperatures reach the boiling point
D
heat never stops flowing within a system
7) The term kilocalorie equals
A
1 calorie or 1 Joule
B
1 Joule or 1000 Calories
C
1000 calories or 1 Calorie
D
1000 Calories or 1 calorie
8) The amount of heat needed to raise the temperature of 1 pound of water by one degree fahrenheit is called a
A
watt
B
calorie
C
joule
D
BTU.
9) At the molecular level, heat energy is found in the ____ of the molecules.
A
vibrational motion
B
equilibrium
C
bonds
D
electronegative properties
10) The amount of heat energy divided by time is called
A
thermal resistance.
B
thermal force.
C
mechanical rate.
D
thermal rate.
*select an answer for all questions
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