Bundle: Electricity For Refrigeration, Heating, And Air Conditioning, 10th + Refrigeration And Air Conditioning Technology, 8th + Mindtap Hvac, 4 ... Whitman/johnson's Refrigeration And Air Condi
8th Edition
ISBN: 9780357261385
Author: Russell E. Smith
Publisher: Cengage Learning
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Textbook Question
Chapter 9, Problem 1RQ
What is the difference between the oxygen we breathe and the ozone located in the earth's stratosphere?
Expert Solution & Answer
To determine
The difference between the oxygen we breathe and the ozone located in the earth's stratosphere.
Explanation of Solution
The difference between the oxygen we breathe and the ozone located in the earth's stratosphere is following.
Oxygen we breathe | Ozone located in the earth's stratosphere |
1. Oxygen used for breathe by living thing is made by two atoms of the oxygen. | 1. Ozone present in the earth's stratosphere is made by three atoms of oxygen. |
2. The chemical formula of Oxygen used for breathe by living thing is | 2. The chemical formula of Ozone present in the earth's stratosphere is |
3. This is ordinary oxygen and mainly present in the atmosphere troposphere layer. | 3. This is a special form of oxygen and mainly present in the atmosphere stratosphere layer. |
4. Oxygen used for breathe by living thing is a transparent gas. | 4. Ozone present in the earth's stratosphere is a bluish colored gas. |
5. This is not a harmful gas. | 5. Ozone is a harmful gas. |
6. Responsible for the life of living things in the earth. | 6. Responsible for the diffraction of ultra-violet lay comes from the sun. |
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a-Write five advantages and two disadvantages of welded joints over riveted joints.
b- Define gas welding.
Q2/ A plate, 75 mm wide and 10 mm thick, is joined with another steel plate by means of single
transverse and double parallel fillet welds, as shown in Figl. The joint is subjected to a maximum
tensile force of 55 kN. The permissible shear stresses in the weld material is 50 N/mm2 respectively.
Determine the required length of each parallel filet weld. (Neglect the tensile stress in the parallel
welding lines and Design based on the shear stresses only)
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1. A round stepped cast iron shaft of diameters d and D with shoulder fillet radius r is
loaded by an axial tensile load P, as shown in the figure below. Compute the value
of P that may be applied to the bar without failure. Given: d = 25 mm, D = 50 mm,
r = 3.75 mm, Sut = 250 MPa, Suc = 380 MPa, N=1.5.
P
2. Make a report about the most effective techniques used by engineers to reduce the
effects of stress concentration.
A conical pivot bearing 150mm in diameter has a cone angle of 120degree . If the shaft supports an axial load of 20kN and the coefficient of friction is 0.03,find the power lost in friction when the shaft rotates at 200r.p.m , assuming 1. Uniform pressure and uniform wear.
Chapter 9 Solutions
Bundle: Electricity For Refrigeration, Heating, And Air Conditioning, 10th + Refrigeration And Air Conditioning Technology, 8th + Mindtap Hvac, 4 ... Whitman/johnson's Refrigeration And Air Condi
Ch. 9 - What is the difference between the oxygen we...Ch. 9 - Describe the difference between good and bad...Ch. 9 - Explain the process of ozone depletion resulting...Ch. 9 - Which refrigerants have a 0 ODP? A. HFCs B. HCFCs...Ch. 9 - An increase in the natural greenhouse effect that...Ch. 9 - True or False: Only CFCs and HCFCs contribute...Ch. 9 - Explain what a global warming potential (GWP) is.Ch. 9 - Prob. 8RQCh. 9 - Describe the difference a direct and an indirect...Ch. 9 - What measurement or index takes into...
Ch. 9 - Describe the differences between CFCs, HCFCs,...Ch. 9 - CFCs are more harmful to the stratospheric ozone...Ch. 9 - Prob. 13RQCh. 9 - Describe the difference between an azeotropic...Ch. 9 - Why are there more safety precautions for R-410A...Ch. 9 - The three most popular synthetic oils in the...Ch. 9 - What is the name of the conference that was held...Ch. 9 - What agency ofthe federal government is charged...Ch. 9 - Explain the differences between active and passive...Ch. 9 - Are federal excise taxes on reclaimed refrigerants...Ch. 9 - Prob. 21RQCh. 9 - Prob. 22RQCh. 9 - To reclaim refrigerant meas to__________.Ch. 9 - Explain what is meant by a nonpressurized recovery...Ch. 9 - Prob. 25RQCh. 9 - Prob. 26RQCh. 9 - The standard that a refrigerant must meet after it...Ch. 9 - Briefly describe the types of piercing valves used...Ch. 9 - Briefly describe an oil-less refrigerant recovery...
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