The diesel engine is a type of （）.

A . decrease until the engine speed increases B . increase as the load increases C . decrease as the load D . increases remain unchanged

A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

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 . produce the heat for ignition B . decrease injection lag C . increase ignition delay D . aid in exhausting burnt gase

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 . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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 . compensate for low oil level B . increase governor promptness C . prevent governor hunting D . limit engine load

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

A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

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 . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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

A . low exhaust back pressure B . early fuel injection in one of the cylinders C . compression pressure in one of the cylinders D . plugged injector hole

A . lower thermal expansion rates than wet liners B . greater heat transfer rate than wet liners C . greater wear resistance than wet liners D . procedure to replace dry liners is simpler than for wet liner

A . piston rod guides B . engine thrust bearing C . crosshead bearing D . main shaft flexible coupling

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.principle B.principal C.cause D.case