REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
8th Edition
ISBN: 9781337370042
Author: TOMCZYK
Publisher: CENGAGE L
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Chapter 8, Problem 18RQ
Why is it important to change the oil on a vacuum pump after each evacuation?
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the three shafts if the diameter ratio is 2 (D/d = 2)? Ans.
na, tension = 1.21, na, bending = 1.19, na, torsion = 1.17.
6.32 A material with a yield strength of S₁ = 350 MPa is
subjected to the stress state shown in Sketch c. What is
the factor of safety based on the maximum shear stress
and distortion energy theories? Ans. For MSST, n, =
11.67.
50 MPa
85 MPa
20 MPa
70 MPa
Sketch c, for Problems 6.32 and 6.33
Can you draw the left view of the first orthographic projection
Chapter 8 Solutions
REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
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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