A . fuel oil pump will over-speed if dirt is not removed
B . fuel oil transfer pumps cannot tolerate small amounts of dirt in the oil
C . fuel injectors may be damaged by foreign particles in the fuel oil
D . dirty fuel will clog the intake air filter
[单选题]Proper atomization of fuel in diesel engine combustion chambers will （）.A . affect the injection pressureB . improve combustionC . reduce compression pressureD . decrease power output
[单选题]The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.A . has begunB . takes placeC . occursD . happe
[单选题]Fuel injection systems meter fuel, atomize fuel, and （）.A . create turbulence in the combustion chamberB . aid in completing cylinder scavengingC . inject fuel at the proper timeD . minimize fuel penetration into the cylinder
[单选题]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.A . ensure penetration and distribution of the fuel in the combustion chamberB . ensure the needle valve is flushed clean during each injectionC . prevent combust
[单选题]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.A . cold corrosion of the nozzlesB . fuel viscosity for better atomizationC . carbon accumulation on the nozzlesD . fuel detonation in the cylinder
[单选题]Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.A．The direction of pressure on the journal in four-stroke engine is continuou
[单选题]Procedures for the proper control and screening of checked baggage are designed to prevent ()from being introduced into the baggage compartment of an aircraftA．weaponsB．explosivesC．hair mouseD．ammunition
[单选题]A． thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/anA．evaporator pressure decreaseB．evaporator coil over-feedC．evaporator capacity increaseD．expansion valve diap
[试题]Proper, scientific study of the impacts of dams and of the cost and benefits of controlling water can help to resolve these conflicts.
[单选题]The experiment shows that proper amounts of exercise, if regularly, can improve our health.A．being carried outB．carrying outC．carried outD．to carry out