Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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In the common rail system of solid fuel injection in a diesel engine, what is the purpose of a control wedge?

Increase fuel pressure
Control the lift of the spray valve
Regulate engine temperature
Test fuel viscosity

The correct answer is: Control the lift of the spray valve

The control wedge in a common rail system of solid fuel injection plays a crucial role in managing the operation of the spray valve. Its primary function is to control the lift of the spray valve, which directly impacts how much fuel is injected into the combustion chamber and the timing of that injection in relation to the engine cycle. By adjusting the lift of the spray valve, the control wedge allows for precise control of fuel delivery, optimizing the efficiency and performance of the diesel engine. This is essential for achieving the desired combustion characteristics, reducing emissions, and improving overall engine performance. The other options do not align with the function of the control wedge in this context. While adjusting fuel pressure, regulating engine temperature, and testing fuel viscosity are all important aspects of diesel engine management, they are not the direct responsibilities of the control wedge within a common rail system.