Refrigeration & Air Conditioning Technology, 8e - 38

38

Section 1 Theory of Heat

9. Describe specific volume.
10. Why does an object weigh less on the moon than on earth?
11. The density of tungsten is 1210 lb/ft3. What would be its
specific volume?
12. The specific volume of red brass is 0.001865 ft3/lb. What
would be its density?
13. Aluminum has a density of 171 lb/ft3. What would be its
specific gravity?
14. Four pounds of a gas occupy 10 ft3. What would be its
density and specific gravity?
15. Why is information regarding the specific volume of
gases important to the designer of air-conditioning, heating, and refrigeration equipment?
16. Whose law states that the volume of a gas varies inversely
with the absolute pressure, as long as the temperature
remains constant?
A. Charles'
B. Boyle's
C. Newton's
D. Dalton's
17. At a constant pressure, how does a volume of gas vary
with respect to the absolute temperature?
18. Describe Dalton's law as it relates to a confined mixture
of non-reactive gases.
19. What are the two types of energy most frequently used or
considered in this industry?

20. How were fossil fuels formed?
is the time rate of doing work.
21.
22. State the formula for determining the amount of work
accomplished in a particular task.
23. If an air-conditioning compressor weighing 300 lb had to
be lifted 4 ft to be mounted on a base, how much work,
in ft-lb, must be done?
24. Describe horsepower and list the three quantities needed
to determine horsepower.
25. How many watts of electrical energy are equal to 1 hp?
26. How many Btu of heat can be produced by 4  kWh of
electricity?
27. How many Btu/h would be produced in a 12-kW electric
heater?
28. What unit of energy does the power company charge the
consumer for?
29. If 3000  ft3 of air is crossing an evaporator coil and is
cooled from 75°F to 55°F, what would be the volume of
air, in ft3, exiting the evaporator coil?
30. A gas is compressed inside a compressor's cylinder. When
the piston is at its bottom dead center, the gas is initially
at 10  psig, 65°F, and 10.5  in3. After compression and
when the piston is at top dead center, the gas is 180°F
and occupies 1.5 in3. What would be the new pressure of
the gas in psig?



Refrigeration & Air Conditioning Technology, 8e

Table of Contents for the Digital Edition of Refrigeration & Air Conditioning Technology, 8e

Contents
Refrigeration & Air Conditioning Technology, 8e - Cover1
Refrigeration & Air Conditioning Technology, 8e - Cover2
Refrigeration & Air Conditioning Technology, 8e - i
Refrigeration & Air Conditioning Technology, 8e - ii
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Refrigeration & Air Conditioning Technology, 8e - Contents
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Refrigeration & Air Conditioning Technology, 8e - Cover4
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