更多"Diesel fuel vapors ()."的相关试题:
[单项选择]If the diesel fuel vapors present are within the flammable range ().
A. the vapor air mixture is too rich to burn
B. an explosion may occur if a source of ignition is present
C. the vapor air mixture is too lean to bum the upper explosive
D. limit has been exceeded
[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]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]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
[单项选择]Clogged diesel engine fuel oil filters can cause()
A. loss of power
B. misfiring
C. low fuel oil pressure
D. All of the above
[单项选择]In the cylinder of a diesel engine fuel is ignited by the()
A. spark from a plug in the pre-combustion chamber
B. electrical discharge from the distributor
C. heat of compression within the cylinder
D. heat from the fuel injection nozzle
[单项选择]A leaking diesel engine fuel injector will cause()
A. prolonged maintenance intervals
B. improved atomization
C. greater fuel economy
D. incomplete combustion
[单项选择]Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of().
A. fuel/water separators
B. day tanks
C. injector test stand
D. fuel filters
[单项选择]Diesel fuel的中文含义是()。
A. 汽油
B. 柴油
C. 煤油
D. 机油
[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]Proper filtering and straining of diesel fuel is important because the()
A. fuel oil pump will over-speed if dirt is not removed
B. fuel oil transfer pumps cannot tolerate small amounts of grit in the oil
C. fuel injectors may be damaged by foreign particles in the fuel oil dirty
D. fuel will clog the intake air filter
[单项选择]The ignition quality of a diesel fuel is indicated by the ()
A. cetane number
B. volatility point
C. viscosity index
D. octane number