Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is one consequence of ignition failure in a diesel engine?

Increased fuel efficiency
Engine stalling
Lower emissions
Enhanced combustion

The correct answer is: Engine stalling

When a diesel engine experiences ignition failure, one significant consequence is engine stalling. Ignition failure in this context refers to the engine's inability to reliably ignite the fuel-air mixture within the combustion chamber, leading to a loss of combustion energy necessary to keep the engine running. This disruption can cause the engine to stop altogether, resulting in stalling. In contrast, the other options do not accurately reflect the outcomes of ignition failure. Increased fuel efficiency, lower emissions, and enhanced combustion would not occur as a result of ignition failure. Fuel efficiency could decline because the engine struggles to use the fuel effectively, and emissions may actually rise due to incomplete combustion. Enhanced combustion is directly contradicted by the definition of ignition failure, as it indicates an improvement in the ignition process rather than a failure. Therefore, the most appropriate consequence of ignition failure in this scenario is indeed engine stalling.