更多"When fuel is injected late into a d"的相关试题:
[单项选择]When fuel is injected in a diesel engine cylinder too early, ()
A. ignition may be delayed
B. fuel economy is not affected
C. exhaust gas temperature will be unchanged
D. the exhaust will be clear
[单项选择]In a diesel engine, when the fuel is injected into the cylinder,()
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
[单项选择]Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ()
A. prolong the ignition delay period
B. ensure the beginning of fuel injection
C. thoroughly utilize the air charge
D. allow controlled fuel combustion
[单项选择]In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with()
A. low firing pressure
B. low exhaust temperature
C. mechanical knock in each cylinder
D. fuel knock in each cylinder
[单项选择]Fuel injected into a diesel engines cylinder is ignited by ().
A. the heat compressed fuel/air mixture in the cylinder
B. the fuel igniter
C. the fuel injector
D. the fuel pump
[单项选择]When fuel enters the crankcase of a diesel engine, it ()
A. dilutes the lube oil and reduces its viscosity
B. forms sulfuric acid in the lube oil
C. causes pitting and failure of the bearings
D. causes sludge deposits on valve stems
[单项选择]Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will()
A. increase engine power
B. increase engine load
C. decrease engine power
D. improve fuel economy
[单项选择]In an ordinary diesel engine the fuel injection begins ()
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单项选择]When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?()
A. Quantity of fuel injected tends to be decreased
B. Quantity of fuel injected will always be increased
C. Start of injection tends to be advanced
D. Duration of injection will always greater
[单项选择]On a diesel engine, fuel is delivered into the combustion space by ().
A. a cooling system
B. a lubrication oil system
C. an electric system
D. an injection system
[单项选择]In a diesel engine, fuel must be broken up into a spray of fine droplets to ().
A. increase its quality
B. obtain complete burning
C. reduce its weight
D. all of the above
[单项选择]When fuel oil has seriously contaminated a diesel engine lubricating oil, you should ().
A. filter to remove the fuel oil
B. use the settler to remove the fuel oil
C. remove the fuel oil by centrifuging
D. drain and then renew the lube oil supply
[单项选择]Late fuel oil injection in a diesel engine can result in ()
A. fuel knock
B. increased power
C. low compression pressure
D. high exhaust temperature
[单项选择]
When fuel oil is accidentally missed with lube oil which of the following processes can be used to separate them?()
Ⅰ.filtering
Ⅱ.settling
A. Ⅰ only
B. Ⅱ only
C. either Ⅰ or Ⅱ
D. neither Ⅰ or Ⅱ
[单项选择]When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should()
A. increase the starting air pressure
B. use a higher than normal cranking speed
C. increase the fuel injection pressure
D. use a fuel having a lower ignition temperature
[单项选择]Late fuel injection in a diesel engine is indicated by low firing pressure with()
A. high exhaust temperature
B. low exhaust temperature
C. fuel knock in each cylinder
D. mechanical knock in each cylinder
[单项选择]Diesel engine fuel oil contamination often results in ()
A. governor malfunctions
B. fuel injection system malfunctions
C. high cylinder lube oil temperatures
D. low intake temperatures
[单项选择]A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in ()
A. ignition lag
B. engine horsepower
C. lube oil system pressure
D. specific fuel consumption