A diesel engine emits blue exhaust smoke as a result of（）

A . prolonged maintenance intervals B . improved atomization C . greater fuel economy D . incomplete combustio

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 . has little or no internal friction B . has a lower effective compression ratio C . operates with scavenge air under a positive pressure D . operates without energy absorbing intake and exhaust stroke

A . open the bypass line B . cut in the lube oil cooler C . pressurize the lube oil system D . top off the expansion tank

A . runs out of fuel B . has low lubricating oil pressure C . exceeds a set maximum speed D . has high cooling water temperature

A . a leaking seal ring B . heat transfer from exhaust valves C . restricted cooling passages D . overheated intake valve

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 . blows out the exhaust gases B . supplies oxygen for combustion C . cools the valves and cylinder walls D . all of the above

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 . proper fuel injection B . water in the fuel C . incomplete combustion D . burning of lube oil

A . decreased fuel efficiency B . increased exhaust temperature C . black smoke D . overspeed tri

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

A . excessive piston to liner clearance B . excessive dirt beneath the piston crown that reduces heat transfer C . faulty nozzle spray D . all of the above

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

A . cylinders B . exhaust valves C . pistons D . fuel valve

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

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

A . check the pyrometer readings B . check the crankcase oil level C . check the fuel oil strainers D . clean the fuel system

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

A . slam charger B . turbocharger C . fuel atomizer D . fuel injector

A . injecting fuel oil into a cylinder B . removing exhaust gases from the cylinder C . forcing air into the cylinders under pressure after the exhaust valve has dosed D . a combination of all the above

A . increase exhaust back pressure B . causes excessive crankcase pressure C . can only be detected by a compression check D . decreases fuel consumptio