Tech Manual for Erjavec's Automotive Technology: A Systems Approach
6th Edition
ISBN: 9781133933731
Author: ERJAVEC, Jack, Thompson, Rob
Publisher: Delmar Cengage Learning
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Chapter 53, Problem 9ASRQ
When removing a vehicle’s ABS electronic control module: Technician A relieves hydraulic pressure in the system. Technician B disconnects the battery ground cable. Who is correct?
- Technician A only
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2. You have decided to use a vacuum purging technique to purge oxygen from a reactor
vessel to reduce the concentration to 2.0% (mol). The reactor is 18 ft diameter and 40 ft
tall. The temperature is 80°F. Assume that the vacuum purge goes from atmospheric
pressure to 10.0 psia. How many purge cycles are required and how many total moles of
nitrogen must be used? Assume the purge is done with pure nitrogen.
An 8-foot ion exchange bed needs to be backwashed with water to remove impurities. The particles have a density of 1.24 g/cm³ and an average size of 1.1 mm.
Calculate:
a. The minimum fluidization velocity using water at 30°C?
b. The velocity required to expand the bed by 30%?
Assumptions: The ion exchange bed particles are spherical (sphericity = 1.1), and the minimum fluidization porosity (ɛM) is 0.3.
Notes:
At 30°C, the viscosity (μ) of water is 0.797 cP, and the density (ρ) is 0.995 g/cm³.
fluidized bed reactor uses a solid catalyst with a particle diameter of 0.25 mm, a bulk density of 1.50 g/mL, and a sphericity of 0.90. Under packed bed conditions, the porosity is 0.35, and the bed height is 2 m. The gas enters from the bottom of the reactor at a temperature of 600°C, with a viscosity of 0.025 cP and a density of 0.22 lb/ft³. At minimum fluidization, the porosity reaches 0.45.
Calculate:
a. The minimum superficial velocity (VM) of the gas entering the fluidized column.
b. The bed height if V = 2 VM
c. The pressure drop under conditions where V =2.5 VM
Chapter 53 Solutions
Tech Manual for Erjavec's Automotive Technology: A Systems Approach
Ch. 53 - What is the primary difference between an...Ch. 53 - Briefly describe the proper steps and testing...Ch. 53 - An ABS modulates brake pressure. What does this...Ch. 53 - Explain the difference between over steer and...Ch. 53 - List the various methods used by traction control...Ch. 53 - Besides indicating ABS faults for some systems,...Ch. 53 - What are the functions of an isolation/dump valve?Ch. 53 - Describe the normal pedal feel when the ABS is...Ch. 53 - Which of the following is a true statement? In...Ch. 53 - What is the name for the gas-filled pressure...
Ch. 53 - What four things should be checked before...Ch. 53 - When inspecting wheel-speed sensors, check for all...Ch. 53 - Define the difference between an integrated and a...Ch. 53 - What is the basic difference between a Delco ABS...Ch. 53 - Why are the wires leading to some wheel-speed sen...Ch. 53 - Technician A says that a malfunction of the ABS...Ch. 53 - While road testing a car equipped with an ABS:...Ch. 53 - Technician A says that the accumulator in an ABS...Ch. 53 - Technician A says that it is normal for the amber...Ch. 53 - Technician A says that some antilock brake systems...Ch. 53 - Technician A says that wheel-speed sensors send an...Ch. 53 - Technician A says that an ABS problem can cause...Ch. 53 - Technician A says that each ABS has its own...Ch. 53 - When removing a vehicles ABS electronic control...Ch. 53 - Technician A says that some traction control...
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