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 28, Problem 15RQ
Which of the following chemicals is commonly added to gasoline to increase its octane rating?
a. Isooctane
b. Heptane
c. Sulfur
d. Ethanol
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fuel additive are being discussed. technician A says adding oxygenates to gasoline increases fuel economy. technician B says adding 10 percent ethanol to gasoline may boost the octane rating 2.5 to 3 points. who is correct?
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
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d. II only
Which 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.
Chapter 28 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 28 - Pump gasoline may contain a small amount of...Ch. 28 - True or False? The diesel fuels antiknock quality...Ch. 28 - What percentage of ethanol does E85 contain?Ch. 28 - List five advantages the use of piezoelectric...Ch. 28 - What does the Reid vapor pressure (RVP) test...Ch. 28 - List three alternative fuels for an internal...Ch. 28 - Why is the sulfur content in gasoline limited?Ch. 28 - Prob. 8RQCh. 28 - What is particulate matter and when is it...Ch. 28 - What are oxygenates and why are they added to...
Ch. 28 - How does SCR lower the content in a diesels...Ch. 28 - True or False? Piezoelectric materials can emit a...Ch. 28 - Name three driveability factors that are affected...Ch. 28 - Which of the following statements about hydrogen...Ch. 28 - Which of the following chemicals is commonly added...Ch. 28 - Technician A says that the use of methanol in...Ch. 28 - Technician A says that reformulated gasoline...Ch. 28 - Technician A says that dedicated vehicles are...Ch. 28 - Technician A says white smoke in the exhaust of a...Ch. 28 - Technician A says piezo material is a type of...Ch. 28 - Prob. 6ASRQCh. 28 - While discussing chemicals that are currently...Ch. 28 - While discussing common rail fuel injection...Ch. 28 - Technician A says diesel engines consume less fuel...Ch. 28 - While discussing the reasons why the use of E85...
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- Why is the sulfur content in gasoline limited?arrow_forwardWhich is not a common automotive fuel? Gasoline Diesel Hydrogen Ethanolarrow_forwardWhile discussing chemicals that are currently added to refined gasoline in order to boost its octane: Technician A says methylcyclopentienyl manganese tricarbonyl (MMT) is normally added to gasoline. Technician B says ethanol can be added to boost the octane rating of gasoline. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward
- While discussing the reasons why the use of E85 gasoline is good for consumers: Technician A says it is produced in the United States and can reduce our reliance on foreign oil. Technician B says an engines fuel consumption is greatly reduced. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardgasoline volatility is being discussed. technician A says gasoline blended for summer use is more volatile than winter gasoline. technician B says in high altitude areas, fuel must be blended to have higher volatility.arrow_forwardWhat is the definition of actual air-fuel ratio?arrow_forward
- What causes high CO emissions? lean air/fuel mixtures rich air/fuel mixtures high combustion temperatures high combustion efficiencyarrow_forwardThe octane number of a fuel is the percentage of octane in that fuel. True Falsearrow_forwardWhat are oxygenates and why are they added to refined gasoline?arrow_forward
- Which of the following statements about fuel trim is not true? a. A positive fuel trim value means that the PCM detects a lean mixture and is decreasing the pulse width to add more fuel to the mixture. b. Short-term fuel trim represents changes made immediately in response to HO2S signals. c. Long-term fuel trim represents changes made to set a new base pulse width. d. Long-term fuel trim responds to the trends of the short-term fuel trim.arrow_forwardWhat percentage of ethanol does E85 contain?arrow_forwardWhile discussing air-fuel ratios: Technician A says that a stoichiometric mixture is theoretically the best combination of fuel and air to provide for total combustion. Technician B says that a stoichiometric mixture always results in complete combustion. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward
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