Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
6th Edition
ISBN: 9780135257272
Author: James D. Halderman
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 7CQ
Selective catalytic reduction (SCR) uses urea injection to reduce ____________ emissions.
- a. NO3
- b. CO2
- c. H2O
- d. CO
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Chapter 19 Solutions
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
Ch. 19 - What is the difference between direct injection...Ch. 19 - What are the three phases of diesel ignition?Ch. 19 - Prob. 3RQCh. 19 - What exhaust after-treatment is needed to achieve...Ch. 19 - What are the advantages and disadvantages of SCR?Ch. 19 - How is diesel fuel ignited in a warm diesel...Ch. 19 - Which diesel system supplies high-pressure diesel...Ch. 19 - What fuel system component is used in a vehicle...Ch. 19 - Which of the following may be a symptom of...Ch. 19 - Technician A says that glow plugs are used to help...
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- While discussing automotive emissions: Technician A says that oxygen emissions are monitored because they are an indication of the completeness of the combustion process. Technician B says that the conditions for minimizing HC emissions are the same as those that cause high NOx emissions. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward1) Which one of the following is an undesirable byproduct of combustion in IC engines that is caused due to high temperature conditions? O Unburnt hydrocarbons. O Soot O Carbon monoxide. O Oxides of nitrogen. 2) Which one of the following statements is true about emissions from Sl engines? OA rich fuel-air mixture decreases the tendency for more HC emissions ONOX emissions would be maximum at a slightly rich mixture O NOx emissions decrease as the fuel-air mixture becomes either too rich or too lean. OA lean fuel-air mixture increases the tendency for more CO emissions 3) Which one of the following is correct about HC emission? O t is reflective of complete combustion of fuel. It results due to improper mixing of fuel and air O Unburnt HCs do not contribute to photochemical smog. O It decreases as the fuelair mixture becomes too leanarrow_forwardWhy is the sulfur content in gasoline limited?arrow_forward
- Describe how a selective catalytic reduction system works.arrow_forwardWhy are carbon dioxide emissions a concern?arrow_forwardA 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 filterarrow_forward
- fuel and combustionarrow_forward3 Ways to extract diesel from a mixture and its step by step processarrow_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_forward
- Why were some fuels called unleaded? I. Lead used to be added to diesel to improve its octane rating II. Blends with minimal lead content replaced lead-heavy fuels. a. Both I and II b. I only c. Neither I nor II d. II onlyarrow_forwarda) Discuss in detail any 4 locations within the diesel engine cylinder where unburnt HC emissions form.arrow_forwardWhat classification of catalysts are used in automotive catalytic converters?arrow_forward
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