Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?（） A: Water discharging from the water outlet of the lube oil purifier B: Fuel oil discharging from the water outlet of the lube oil purifier C: Lube oil discharging from the water outlet of the lube oil purifier D: A change in the lube oil viscosity

A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.

The quality of the fuel oil and lube oil （）， Im afraid.

When fuel enters the crankcase of a diesel engine, it （） A: dilutes the lube oil and reduces its viscosity B: forms sulfuric acid in the lube oil C: causes pitting and failure of the bearings D: causes sludge deposits on valve stem

For a main diesel engine the lube oil in the bearings is drawn from （）， usually located in the bedplate.

Before starting a diesel engine that has an engine driven lube oil pump， the engineer should （）.

The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.

The lube oil pump used in a diesel engine is a( ) usually. A: volute pump B: centrifugal pump C: diaphragm pump D: gear pump

Waste oil from the lube oil sumps of machinery may NOT be （）. A: drained into the vessels bilges B: reclaimed for other uses C: held in a slop tank D: purified and then reused

Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （） A: amount of scavenge air to the cylinder B: quality of fuel injected C: viscosity of the lube oil D: compression ratio of the pisto