Question 197Motor Plants - Assistant Engineer70% to pass
When starting a diesel engine at temperatures below 70°F, the frictional resistance to turning will be _______________.
AI Explanation
The correct answer is C) proportional to the lube oil viscosity.
At temperatures below 70°F, the lube oil viscosity increases, which leads to higher frictional resistance when starting the diesel engine. This is because the increased viscosity of the lube oil makes it more resistant to flow, resulting in higher frictional forces within the engine components. Increasing the lube oil pressure (option A) may help overcome this, but the root cause is the higher viscosity. Reducing the compression ratio (option B) or heating the intake air (option D) do not directly address the issue of lube oil viscosity affecting the frictional resistance.
Related Questions
#195 An accumulator used in a hydraulic starting system is generally located between the_______________.#196 Which of the routine maintenance procedures listed is required for starting air receivers? #198 A two-stroke cycle diesel engine requires less starting air than a four-stroke cycle diesel engine, of equal displacement, because the two-stroke cycle diesel engine _______________.#199 Starting air check valves are held firmly on their seats by_______________.#200 A decrease in the flash point of diesel engine lube oil indicates the lube oil has become _______________.