Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 9, Problem 1TF
True or False? In an HCCI engine, combustion immediately and simultaneously produces a steady flame across the mixture.
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1.Which of the following is an example of combustion?.
a. flaming methane bubbles.
b. toasty campfire c. running diesel truck engine
d. all of the above
2. Heat is measured in
a. bules b. grams
c. degrees celcius
d. kJ
3.Iso-octane CH₁ is burned with 120% theoretical air in a small three-cylinder
turbocharged automobile engine, calculate: -
a the stoichiometric air-fuel ratiol
b. the equivalence ratio?
True or False? In an HCCI engine, combustion immediatelyand simultaneously produces a steady flameacross the mixture.
Calculate the exhaust gas composition of a butane-fuelled spark-ignition engine operating with equivalence ratio of 0.9. Assume the fuel is fully burned within the cylinder. Butane is C4H10.
Chapter 9 Solutions
Automotive Technology
Ch. 9 - Prob. 1SACh. 9 - Describe what takes place during the four strokes...Ch. 9 - As an engines compression ratio increases, what...Ch. 9 - What test can be performed to check the efficiency...Ch. 9 - Describe five ways in which an engine can be...Ch. 9 - Prob. 6SACh. 9 - True or False? In an HCCI engine, combustion...Ch. 9 - True or False? SAE mandates that engine, when...Ch. 9 - True or False? The camshaft is always located in...Ch. 9 - Which of the following statements about engines is...
Ch. 9 - Which stroke in the four-stroke cycle begins as...Ch. 9 - Which of the following is not a true statement...Ch. 9 - Technician A says head gasket thickness has an...Ch. 9 - The stroke of an engine is the crank throw half...Ch. 9 - Which of the following is an expression of how...Ch. 9 - While diagnosing the cause for blue smoke from the...Ch. 9 - Prob. 2ASRQCh. 9 - While determining the cause for air leaking out of...Ch. 9 - While diagnosing the cause for an engine having...Ch. 9 - While looking at the results of an oil pressure...Ch. 9 - A vehicle is producing a sharp, metallic rapping...Ch. 9 - While conducting an engine vacuum test; Technician...Ch. 9 - While determining the most likely problem of an...Ch. 9 - When a customer states that black exhaust smoke is...Ch. 9 - Technician A says that if an engine had good...
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- What products of combustion are produced with ideal combustion when fuel oil is burned?arrow_forwardDifferentiate complete combustion from incomplete combustion.arrow_forwardWhat is the pressure ratio in an ideal dual combustion if the pressures at the beginning and end of the constant volume portion of combustion are 2,910.57 kPa and 4,400.43 kPa respectively.arrow_forward
- 1. In an ideal dual combustion cycle, what is the pressure at the beginning of constant pressure combustion if the pressure ratio is 1.4 and the pressure at the beginning of the constant volume portion of combustion is 2500 kPa.arrow_forwardQ6. Answer following questions by True or False 1. Injector that sprays into the intake system operate at the same pressure of the carburetor. 2. Swirl in the cylinder enhances the mixing of air and fuel to give a homogeneous mixture in the very short time. 3. Flame development region is consumed 80% of the air-fuel mixture. 4. Maximum temperature and pressure of flame propagation occurs somewhere between 20" and 30° aTDC for a four-stroke cycle. 5. Knock caused by self-ignition could occur in S1 engines as well as in CI engines. 6. Detonation is the minimum combustion time possible without actually having an instantaneous constant-volume reaction. 7. Combustion in a CI engine is a flame front moving through a homogeneous mixture. 8. Fuel injection time in CI engine is usually starting at about 15° bTDC and ending about 5° aTDC. 9. Exhaust blowdown occurs when the exhaust valve starts to open somewhere around 60° to 40° bTDC. 10. The average temperature in the exhaust system of a…arrow_forwardWhen are mixtures termed as fuel rich in internal combustion engine?arrow_forward
- a. What is the specific brake work (kJ/kgfuel) of a 4 L single-cylinder propane engine operating stoichiometrically, if the heat transfer to the coolant is 17 kW, the air and fuel enter the engine at 298 K, the exhaust is 700 K, and the propane mass flow rate is 1.2 g/s? b. A four-stroke 6 L engine is fueled lean with methane at an equivalence ratio ? = 0.8. It operates at 2000 rpm with a volumetric efficiency of 0.80. The exhaust temperature is 800 K, and the heat transfer to the coolant is 3.4 ×105 kJ/kmolfuel. What is the engine’s thermal efficiency and power?arrow_forwardAn advantage of using natural gas, rather than oil, as a fuel is that natural gas is?arrow_forwardIn the complete combustion of an ideal gas, which of the following yields a higher exit temperature in the burner? Assume all products are in the gas phase. 1. Increasing the percent excess air 2. Decreasing the inlet temperature of fuel a.2 only b.1 only c.Both 1 and 2 d. None of the choicesarrow_forward
- (6a) Explain and discuss in your own words, the following three concepts incombustion: stoichiometric mixture of air and fuel, weak mixture and richmixture. Explain their importance in combustion applicationsarrow_forwardPls answer thank you! Producer gas from bituminous coal contains following molar analysis. CH4 = 3 %, H2 = 14.0%, N2 = 50.9%, O2 = 0.6%, CO = 27.0% and CO2 = 4.5%. This is burned with 25% excess air, Calculate the air/fuel ratio on a volumetric basis.arrow_forwardWhat are the safety on Solid fuels?arrow_forward
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