Bundle: Refrigeration And Air Conditioning Technology, 8th + Lab Manual + Lms Integrated For Mindtap Hvac-r, 4 Terms (24 Months) Printed Access Card
8th Edition
ISBN: 9781337087315
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 5, Problem 8RQ
A vacuum pump is used to
A. remove contaminants from a refrigeration system.
B. vacuum dust before installing the refrigeration system compressor.
C. vacuum the area before using an air-acetylene unit.
D. prepare an area for taking a temperature reading.
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2. A spur gear made of bronze drives a mid steel pinion with angular velocity ratio of 32: 1. The
pressure angle is 14½. It transmits 5 kW at 1800 r.p.m. of pinion. Considering only strength, design
the smallest diameter gears and find also necessary face width. The number of teeth should not be less
than 15 teeth on either gear. The elastic strength of bronze may be taken as 84 MPa and of steel as 105
MPa. Lewis factor for 14½½ pressure angle may be taken
0.684
0.124
y =
No. of teeth
as
[Ans. m 3 mm; b= 35 mm; Dp = 48 mm; D= 168 mm]
Q2. Determine the safety factors for the bracket rod shown in Figure 2 based on both the
distortion-energy theory and the maximum shear theory and compare them.
Given: The material is 2024-T4 aluminum with a yield strength of 47 000 psi.
The rod length /= 6 in. and arm a = 8 in. The rod outside diameter od 1.5 in., id = 1 in, h=2 in.,
t=0.5 in., Load F= 1000 lb.
Assumptions: The load is static and the assembly is at room temperature. Consider
shear due to transverse loading as well as other stresses. (Note: solve in SI units)
wall
tube
Figure 2
arm
Chapter 5 Solutions
Bundle: Refrigeration And Air Conditioning Technology, 8th + Lab Manual + Lms Integrated For Mindtap Hvac-r, 4 Terms (24 Months) Printed Access Card
Ch. 5 - _________and _________are two types of screwdriver...Ch. 5 - Five different types of wrenches are_____,_____,...Ch. 5 - Give an examples of a use for a nut driver.Ch. 5 - List four different types of pliers.Ch. 5 - Describe two types of benders for soft tubing.Ch. 5 - A wiring and crimping tool is used to A. crimp...Ch. 5 - A flaring tool is used to A. cut copper tubing. B....Ch. 5 - A vacuum pump is used to A. remove contaminants...Ch. 5 - Two types of refrigerant leak detectors are...Ch. 5 - List the components usually associated with a...
Ch. 5 - List three types of thermometers.Ch. 5 - For what type of soldering is a soldering gun...Ch. 5 - An air-acetylene unit is used for _______ and...Ch. 5 - Prob. 14RQCh. 5 - When are air velocity measuring instruments used?Ch. 5 - Describe the purpose of CO2 and O2 indicators.Ch. 5 - What is the purpose of a draft gauge?Ch. 5 - Prob. 18RQCh. 5 - Why would a technician use an electronic charging...Ch. 5 - Why is it necessary to recover refrigerant?
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