更多"When the opening pressure of a dies"的相关试题:
[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 fuel injector is greater than that specified by the engine manufacturer,the ()
A. quantity of fuel injected is decreased
B. quantity of fuel injected will always be increased
C. start of injection is advanced
D. duration of injection will always be 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]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]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]When fuel is injected late into a diesel engine cylinder,().
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
[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]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
[单项选择]An over-speed trip stops a diesel engine when the engine ()
A. runs out of fuel
B. has low lubricating oil pressure
C. exceeds a set maximum speed
D. has high cooling water temperature
[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]The most common diesel engine fuel system problems are caused by ().
A. incorrect adjustments
B. dirty fuel
C. broken fuel lines
D. excessive vibration
[单项选择]Faulty operation of diesel engine fuel injection nozzles can be directly caused by ().
A. water in the fuel oil supply
B. excessive fuel nozzle holder cooling
C. a distorted fuel spray pattern
D. leakage past the plunger into the oil drain
[单项选择]Significant retardation of a diesel engine fuel injection timing will result in ()
A. smoother engine operation
B. advanced fuel ignition
C. increased fuel economy
D. reduced engine power
[单项选择]Problems with the diesel engine fuel injection pump are usually caused by()
A. improper adjustment
B. contaminated fuel
C. kinked fuel lines
D. excessive engine vibration
[单项选择]If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will()
A. backfire through the air intakes
B. develop less power under load
C. have high firing pressures
D. lift its cylinder relief valves
[单项选择]Permitting a diesel engine fuel oil day tank to run dry can cause ()
A. overheated injection pumps
B. water condensation in the cylinders
C. fuel dilution of the lube oil
D. air in the fuel system