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 8, Problem 13RQ
When evacuating a refrigeration system that has solenoid valves, what special procedure must be followed?
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5 kN-m
A beam with an inverted tee-shaped cross section is subjected to positive bending mo-
ments of M₂ = 5 kN-m. The cross-sectional dimensions of the beam are shown below.
10 mm
Determine:
(a) the centroid location, the
moment of inertia about the
z axis,
40 mm
5 kN-m
K
150 mm
H
15 mm
120 mm
(b) the bending stress at points
H and K.
ans: 17.83mPa
(c) the maximum bending stress
produced in the cross section.
EXAMPLE 6.4
Draw the shear and moment diagrams for the beam shown in Fig. 6-7a.
15 kN
80 kN·m
-5 m
B
-5 m
(a)
5 kN/m
D
2) A short rectangular post supports compressive loads of P- 175 kN and Q-90 kN, as shown in the
figure below. A top view of the post showing the locations where loads P and Q are applied to the
top of the post is also given. Determine the vertical normal stresses at corners a, b, c, and d of the
post.
P=175 kN
Q=90 kN
160 mm
120 mm
b
40 mm
160 mm
a
x
d
60 mm
40 mm
Chapter 8 Solutions
Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
Ch. 8 - The low-pressure side of the system must not be...Ch. 8 - Name and briefly describe the six classes of...Ch. 8 - The ________is both the greatest asset and the...Ch. 8 - Why should oxygen or compressed air never be used...Ch. 8 - List some of the foreign matter that may enter a...Ch. 8 - True or False: A vacuum pump can remove any type...Ch. 8 - Air in a refrigeration system causes which of the...Ch. 8 - The only two products that should be circulating...Ch. 8 - In order to remove moisture from a refrigeration...Ch. 8 - Are the best vacuum pumps one-stage or two-stage?
Ch. 8 - Name the two types of vacuum procedures used by...Ch. 8 - What can be done to get water out from under the...Ch. 8 - When evacuating a refrigeration system that has...Ch. 8 - What is today's most accurate type of deep vacuum...Ch. 8 - _________microns are in 1 inch.Ch. 8 - Briefly describe the method for cleaning up a...Ch. 8 - What is the advantage of using large gauge lines...Ch. 8 - Why is it important to change the oil on a vacuum...Ch. 8 - Describe the meaning of a deep vacuum, and explain...Ch. 8 - List the main advantages of a microfoam leak...Ch. 8 - What could an oily dust spot on a condenser or...Ch. 8 - Why should a condenser be covered with a sheet...Ch. 8 - Leaks that occur only when the unit is in...Ch. 8 - Briefly describe a combination-dependent leak.
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