A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）

A . low firing pressure and low exhaust temperatures B . low firing pressure and normal exhaust temperatures C . high firing pressure and low exhaust temperatures D . high firing pressure and high exhaust temperature

A . tension load twice each crankshaft revolution B . compression load during power and compression strokes C . inertia load once every four crankshaft revolutions D . bending loads at bottom and top dead center

A . top of the ring groove B . cylinder liner oil film C . bottom of the ring groove D . back of the ring groove

A . testing for the mechanical load and the thermal load B . inspecting thermal and mechanical condition of the engine C . inspecting each system and exhaust temperature D . testing for compress pressure and explosion pressure

A . low compression temperature B . low ambient air pressure C . high lube oil pump pressure D . high fuel oil booster pump pressure

A . fine atomization B . high temperature C . good mixing of fuel and air D . all of the above

A . too light of a load B . injection timing is too early C . overloading of the engine D . too low of a compression ratio

A . during the valve overlap period B . with only the exhaust valve open C . at a pressure below atmospheric D . without cooling the cylinders or pisto

A . the exhaust will be clear B . fuel consumption will be low C . all the fuel will be burned at top dead center D . fuel consumption will be high

A . counterbalance the crank throws on the crankshaft B . keep the engine running smoothly between power stroke C . provide a belt-driving surface for the operation of auxiliary machinery D . prevent the engine from overspeeding

A . the piston is just coming upward from the bottom dead center B . the piston has moved about one-fifth of the way up C . the piston has moved most of the way up and almost reached the TDC D . the piston has just past the TDC

A . Oil temperature B . Manifold pressure C . Exhaust gas temperature D . Fuel consumptio

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

A . valve guides B . oil control rings C . valve seats D . compression ring

A . a cooling system B . a lubrication oil system C . an electric system D . an injection system

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 . intake valves B . carburetor C . exhaust ports D . injector nozzle

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、A. turbine engine B、B. gas turbine C、C. steam engine D、D. internal combustion engine

A . Increases efficiency B . Increases engine horsepower C . Increases engine life D . Reduces engine horsepower

A . cross-head B . cylinder C . connecting rod D . spark plug

A . control axial movement of the crankshaft B . transmit engine thrust to the propeller shaft C . absorb vibrations in the propeller shafting D . prevent propeller thrust from being transmitted to the hul

A . higher working temperature of piston and cylinder B . the use of scavenge ports C . fewer power strokes per revolution of the crankshaft D . part of the fuel is burned as the piston is moving away from top dead center

A.principle B.principal C.cause D.case