Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 33, Problem 5ASRQ
While discussing SCR systems: Technician A says that they are used in place of a conventional catalytic converter to reduce NOx, CO, and HC. Technician B says that the most common reductant used is SCR systems is an ammonia-like substance called urea. Who is correct?
a. Technician A only
b. Technician B only
c. Both A and B
d. Neither A nor B
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Check out a sample textbook solutionStudents have asked these similar questions
A chamber installed in the exhaust flow that contains material that aids emission reduction via chemical reaction.
a. muffler
b. exhaust filter
c. catalytic converter
d. emission filter
What is required for a combustile mixture
A. OXYGEN
B. FUEL
C. WATER
PUT CHECK MARK OR CROSS MARK TO THE LETTER
10) Which one of the following statements is incorrect about a catalytic converter?
O It is not very efficient at lower temperatures.
O Its NOx conversion efficiency is highest for very lean mixtures.
O Its CO conversion efficiency is high for lean mixtures.
O Lead reduces its effectiveness.
11) Which one of the following is true about a particulate trap?
O It is predominantly used in Sl engines.
O It does not offer a restriction to exhaust flow.
O It requires periodic regeneration.
O It is predominantly used to reduce NOx emissions.
Chapter 33 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 33 - Explain why a small PCV valve opening is adequate...Ch. 33 - At what temperature do nitrogen atoms combine with...Ch. 33 - Describe the operation of a digital EGR valve.Ch. 33 - Name the three types of emissions being controlled...Ch. 33 - The PCV system prevents from escaping to the...Ch. 33 - In a negative backpressure EGR valve, if the...Ch. 33 - Describe how a selective catalytic reduction...Ch. 33 - HC emissions may come from the tailpipe or...Ch. 33 - What types of catalyst are typically used to...Ch. 33 - Why is a PCV system critical to an engines...
Ch. 33 - Which of the following systems is designed to...Ch. 33 - What is a catalyst?Ch. 33 - Rather then rely on the AIR system for extra...Ch. 33 - Which of the following statements about carbon...Ch. 33 - Why do the EGR systems on many late-model diesel...Ch. 33 - While discussing PCV valve operation: Technician A...Ch. 33 - While discussing EGR systems with a differential...Ch. 33 - While discussing evaporative (EVAP) systems:...Ch. 33 - Technician A says that an EGR valve that is stuck...Ch. 33 - While discussing SCR systems: Technician A says...Ch. 33 - While discussing automotive emissions: Technician...Ch. 33 - Technician A says that during oxidation, as NOx...Ch. 33 - While discussing PCV systems without a PCV valve:...Ch. 33 - While diagnosing the cause of high HC and O2...Ch. 33 - While discussing electric exhaust gas...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Which of the following statements about fuel cells is NOT true?a. A single fuel cell produces very low voltage, normally less than one volt.b. A fuel cell produces electricity through an electro-chemical reaction that combines hydrogen and oxygen to form water.c. A fuel cell is composed of two electrodes coated with a catalyst and separated from each other by an electrolyte and from the case by separators.d. In a fuel cell, catalysts are used to ignite the hydrogen; this causes a release of electrons or electrical energy.arrow_forwardWhich of the following statements about carbondioxide is not true?a. CO2 levels are highest when the air-fuel ratiois slightly leaner than stoichiometric.b. The production of CO2 is directly related tothe amount of fuel consumed; therefore,more fuel-efficient engines produce less CO2c. To reduce CO2 levels in the exhaust, engineers are working hard to decrease fuel consumption to keep CO2low.d. The concern for CO2 emissions is one of theprimary reasons for the delayed use of alternative fuels for automobiles.arrow_forwardWhile discussing the MIL on OBD II systems: Technician A says that the MIL will flash if the PCM detects a fault that would damage the catalytic converter. Technician B says that whenever the PCM has detected a fault, it will turn on the MIL. Who is correct? a. Technician A • Technician B • Both A and B • Neither A nor Barrow_forward
- Technician A says that the PCV system is designed tolimit CO emissions. Technician B says that catalyticconverters reduce HC emissions at the tailpipe. Whois correct?a. Technician Ab. Technician Bc. Both A and Bd. Neither A nor Barrow_forwardWhich of the following statement about carbon dioxide is not true? a. CO2 , levels are highest when the air fuel ratio is slightly leaner than stoichiometric. b. The production CO2 , is directly related to the amount of fuel consumed; therfore, more fuel efficient engines produce less CO2 c. To reduce CO2 , levels in the exhaust, engineers are working hard to decrease fuel consumption to keep CO2 low. d. The concern for CO2 emissions is on of the primary reasons for the delayed use of alternative fuels for automobiles.arrow_forwardIncomplete combustion is permitted because a significant amount of heat is still generated. true of falsearrow_forward
- Technician A says that black exhaust smoke is an indication of a too-rich air-fuel mixture. Technician B says that white smoke (steam) is an indication of coolant being burned in the engine.arrow_forwardGasoline in a fuel tank has been contaminated with water from condensation. Tech a says it will stay on the surface of the fuel and can be skimmed (removed) off. Tech b says that it will dissolve in the gasoline and be burned during the combustion process. Who is correct?arrow_forwardWhile discussing EFI systems: Technician A says that the PCM provides the proper air-fuel ratio by controlling the fuel pressure. Technician B says that the PCM provides the proper air-fuel ratio by controlling injector pulse width. Who is correct? * 1 point a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward
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