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单选题
Which of the following represents the significance the fuel oil cetane number?（）
A
The cetane number has no affect on injection lag
B
The cetane number is an indication of the fuel’s viscosity
C
Ignition lag is reduced with fuels having a high cetane number
D
The cetane number is of little significance in the combustion
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更多 “单选题Which of the following represents the significance the fuel oil cetane number?（）A The cetane number has no affect on injection lagB The cetane number is an indication of the fuel’s viscosityC Ignition lag is reduced with fuels having a high cetane numberD The cetane number is of little significance in the combustion” 相关考题
考题
Which of the following represents the significance the fuel oil cetane number?A.The cetane number has no affect on injection lagB.The cetane number is an indication of the fuel's viscosityC.Ignition lag is reduced with fuels having a high cetane numberD.The cetane number is of little significance in the combustion process
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Which of the following problems is the main source of fuel pump and injection system malfunctions?A.Improper lubricationB.Air in the fuel systemC.Coated fuel linesD.Excessive vibration
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Which of the following represents a wiring standard for twisted pair cables?（）A、FiberB、T568AC、IEEE1394D、CAT5
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The "1000" in 1000BaseT cabling represents which of the following?（）A、The theoretical maximum cable lengthB、The theoretical maximum bandwidthC、The theoretical port limit of the cableD、The quality level of the copper wiring used
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Which of the following represents a safety hazard？（）A、liquid on the floorB、a tiled floorC、a concrete floorD、carpet
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Which of the following describes what the number two represents in l00Base2 cabling?（）A、FiberB、Coaxial cableC、UTPD、Twisted pair
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The internet address 198.102.27.120 represents which of the following addresses？（）A、Class AB、Class BC、Class CD、Class D
考题
单选题Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）A
Chain reactionB
Thermal actionC
Chemical occlusionD
Pyrotechnical reaction
考题
单选题In the last sentence of the third passage, to which of the following does it refer?A
Yellow "hump".B
Day.C
Sun.D
Hydrogen fuel.
考题
单选题Which of the following problems is the main source of fuel pump and injection system malfunctions?（）A
Improper lubricationB
Air in the fuel systemC
Coated fuel linesD
Excessive vibration
考题
单选题Which of the following can be obtained by means of an indicator card?（）A
the peak pressure in a cylinderB
the temperature of the cooling waterC
the fuel consumptionD
none of the above
考题
单选题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 decreasedB
Quantity of fuel injected will always be increasedC
Start of injection tends to be advancedD
Duration of injection will always greater
考题
单选题Which of the following machinery space operations is required to be logged in the Oil Record Book?（）A
Ballasting or cleaning of fuel oil tanksB
Shifting suction of main fuel pump to reserve fuel oil tankC
Changing out sprayer plates to adjust for steam demandD
Daily inspection of engine room bilges
考题
单选题A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）A
GasolineB
WaterC
Lubricating oilD
sulphur compounds
考题
单选题Which of the following statements is true concerning the cetane number of diesel fuel?（）A
The cetane number affects the amount of injection lagB
The cetane number is an indication of the fuels viscosityC
Ignition lag is reduced with fuels having a high cetane numberD
The cetane number is of little significance in the combustion process
考题
单选题Which of the following statements is true concerning the cetane number rating of diesel fuel? （）A
The cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbonB
The higher the cetane number, the shorter the ignition lagC
The highest cetane number of fuel is 100D
All of the above
考题
单选题Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）A
Leaking fuel injectorsB
Lower than normal compressionC
Delayed fuel injectionD
All of the above are correct
考题
单选题Which of the following represents a wiring standard for twisted pair cables?（）A
FiberB
T568AC
IEEE1394D
CAT5
考题
单选题Which of the following is true about the fuel injection with an ordinary diesel engine?（）A
The process begins after TDCB
The process ends before TDCC
When the piston is near to the TDC the fuel injection endsD
None of the above is true
考题
单选题Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）A
The amount of fuel injected will be increasedB
The start of injection will be retardedC
The nozzle will permit fuel to dribbleD
The spray pattern will be distorted
考题
单选题Which of the following statements is least likely to cause the ignition of fuel vapors?（）A
Static electricityB
An open running electric motorC
Loose wiringD
Explosion proof lights
考题
单选题Which of the following represents a safety hazard？（）A
liquid on the floorB
a tiled floorC
a concrete floorD
carpet
考题
单选题Which of the following most closely represents an image copy? （）A
Unix cp command of a fileB
Bit-by-bit copy of a fileC
Windows COPY command of a file D
All of the above
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