In a diesel engine, blow-by（）

A . high lube oil viscosity B . increased lube oil consumption C . low lube oil temperatures D . high firing pressure

A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

A . low oil pressure B . high coolant pressure C . leaking fuel injector D . cracked cylinder head or liner

A . ignition lag B . engine horsepower C . lube oil system pressure D . specific fuel consumptio

A . smoky exhaust B . starting failure C . overload D . over speed

A . decreased compression pressure B . increased lube oil pressure C . lower lube oil temperature D . excessive leakage past the piston ring

A . cam followers B . push rods C . combustion gases D . valve spring

A . increase thermal efficiency B . cause clogging of the fuel system C . increase the ability of the engine to start in cold weather D . produce corrosion in the cylinder and exhaust system at low load

A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

A . excessive lube oil consumption B . lower than normal lube oil temperature C . higher than normal exhaust back pressure D . excessive crankshaft end play

A . high compression pressure B . low intake air temperature C . low exhaust pressure D . high scavenge air pressure

A . lower the no-load RPMs B . provide more air for combine with the fuel C . increase the no-load RPMs D . provide more fuel combine with the air

A . low water in the expansion tank B . improperly seated valves C . low fuel oil pressure D . worn or broken cylinder liner sealing ring

A . immediately open all crankcase relief ports B . increase crankcase exhauster speed to draw cool air into the engine C . allow the engine to cool naturally D . increase crank case scavenge air to remove unburned gase

A . engine power losses B . smoking due to unburned fuel C . high exhaust temperature readings D . all of the above

A . clogged coolant passages B . a leaking cylinder head gasket C . low fuel oil pressure D . worn or broken cylinder liner sealing ring

A . The direction of pressure on the journal in four-stroke engine is continuously B . positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C . four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D . Low-stroke engines usually consume less lube oil than four-stroke engine

A . as much fuel as B . less fuel than C . less fuel as D . more fuel tha

A . smoky exhaust B . starting failure C . ignition relay D . over speed

A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

A . smoky exhaust B . starting failure C . overload D . over speed

A . at TDC B . before TDC C . after TDC D . during air starting

A . worn or broken cylinder liner sealing rings B . high cooling water temperature C . worn or broken piston rings D . low fuel oil pressure