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Lean burn: Quiz


Question 1: During the time this design was in production this system (CVCC, Compound Vortex Controlled Combustion) primarily allowed lower emissions without the need for a ________.
AutomobileCatalytic converterSpark plugInternal combustion engine

Question 2:
Lean burn refers to the use of lean mixtures in an ________.
Spark-ignition engineAutomobileInternal combustion engineStroke ratio

Question 3: The ________ can be as high as 65:1, so the mixture has considerably less fuel in comparison to the stoichiometric combustion ratio (14.7 for petrol for example).
Air-fuel ratioCatalytic converterGasolineAlkane

Question 4: Lean burn concepts are often used for the design of heavy-duty natural gas, ________, and liquefied petroleum gas (LPG) fuelled engines.
Ethanol fuelBiogasBioenergyBiofuel

Question 5: The main drawback of lean burning is that a complex ________ system is required to reduce NOx emissions.
Catalytic converterInternal combustion engineAutomobileSpark plug

Question 6: From 1976 through 1989, ________ equipped many vehicles with their Electronic Lean Burn (ELB) system, which consisted of a spark control computer and various sensors and transducers.
General Motors Chapter 11 reorganizationGeneral MotorsChryslerChrysler Chapter 11 reorganization

Question 7: The older ________ engines that used lean burn (not all did) accomplished this by having a parallel fuel and intake system that fed a pre-chamber the "ideal" ratio for initial combustion.

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