Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
8th Edition
ISBN: 9781305578708
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 10, Problem 8RQ
Two or more refrigerants combined together to createanother refrigerant is referred to as a(n) ________.
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The volume of 1 kg of helium in a piston–cylinder device is initially 5 m3. Now helium is compressed to 3 m3 while its pressure is maintained constant at 130 kPa. Determine the initial and final temperatures of helium as well as the work required to compress it, in kJ. The gas constant of helium is R = 2.0769 kJ/kg·K.
The initial temperature of helium is K.
The final temperature of helium is K.
The work required to compress helium is kJ.
A piston-cylinder device initially contains 0.4 kg of nitrogen gas at 160 kPa and 140°C. Nitrogen is now expanded isothermally to a
pressure of 80 kPa. Determine the boundary work done during this process. The properties of nitrogen are R= 0.2968 kJ/kg-K and k=
1.4.
N₂
160 kPa
140°C
The boundary work done during this process is
KJ.
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An abrasive cutoff wheel has a diameter of 5 in, is 1/16 in thick, and has a 3/4-in bore. The wheel weighs 4.80 oz and
runs at 11,700 rev/min. The wheel material is isotropic, with a Poisson's ratio of 0.20, and has an ultimate strength of 12
kpsi.
Choose the correct equation from the following options:
Multiple Choice
о
σmax=
(314) (4r2 — r²)
-
о
σmax = p² (3+) (4r² + r²)
16
σmax =
(314) (4r² + r²)
σmax =
(314) (4² - r²)
Chapter 10 Solutions
Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
Ch. 10 - How can liquid refrigerant be added to the...Ch. 10 - How is the refrigerant cylinder pressure kept...Ch. 10 - Why does the refrigerant pressure decrease in a...Ch. 10 - What type of equipment normally has the...Ch. 10 - Why are digital scales preferred over other types...Ch. 10 - How does a graduated cylinder account for the...Ch. 10 - What methods besides weighing and measuring are...Ch. 10 - Two or more refrigerants combined together to...Ch. 10 - Define temperature glide, and give examples of...Ch. 10 - A portion of a refrigerant blend that is...
Ch. 10 - What is the main difference between a zeotropic...Ch. 10 - What is meant by "restricting" liquid refrigerant...Ch. 10 - What causes fractionation in certain refrigerant...Ch. 10 - When should a service technician use the...Ch. 10 - A service technician is charging an...Ch. 10 - A technician takes the following readings on an...
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