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单选题
Which of the following is true about the fuel injection with an ordinary diesel engine?（）
A
The process begins after TDC
B
The process ends before TDC
C
When the piston is near to the TDC the fuel injection ends
D
None of the above is true
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更多 “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” 相关考题
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Which of the following is TRUE about the family Katy is living with?A. They are friendly. B. There are three people in their house.C. They are strange. D. They have never taken Katy to the parties.
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Which of the following statements about Leopold and Rudolph Blaschka is TRUE?A. They were brothers.B. They were artists.C. They were florists.D. They were farmers.
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Because the timing of injection is crucial, _____ mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.A.gearsB.ramsC.barrelsD.cams
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Which of the following is NOT true about the centrifugal separator?
A.It can be applied to separate two liquidsB.It cannot separate solids which contaminated in the oil.C.It consists of purifier and clarifierD.The centrifuge arranged to separate two liquids is known as purifier
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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 statements about language is NOT true?A.Language is a system
B.Language is symbol
C.Animals also have language
D.Language is arbitrary
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Which of the following is TRUE about a caching name server？（）A、They must have a trusted SSL certificateB、They can be authoritativeC、They cannot be load-balancedD、They can be recursiveE、They require DHCP
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Which of the following statements is true about a router's eBGP peers that is not also true about that same router's iBGP peers?（）A、The eBGP peer neighborship uses TCPB、The eBGP peer uses port 180 (default)C、The eBGP peer uses the same ASN as the local routerD、The eBGP peer updates its AS_Path PA before sending updates to this router
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单选题The primary function of a fuel delivery check valve assembly is to（）A
deliver proper fuel quantity to the injection nozzleB
provide rapid fuel injection cutoffC
control fuel quantity entering the pump bodyD
control fuel pressure delivered to the combustion chamber
考题
单选题Which of the following is TRUE about the book?A
It is the first world encyclopedic dictionaryB
It can help deaf people know about the world more easilyC
It took them sixteen years to finish the bookD
It includes medicine and art about the life of deaf people
考题
单选题Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.A
BHPB
MCRC
IHPD
MEP
考题
单选题If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?（）A
Increase the cooling water flow to the engineB
Secure or reduce fuel to that cylinderC
Screw down on the pressure adjusting spring to decrease to decrease popping pressureD
Readjust the injection timing
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 statements is NOT true about the postal service?A
American abortionists were not happy about it.B
The stamp was invented in Britain.C
It helped the independence of America.D
In the 1840s it was the major means of national communications in Britain.
考题
单选题A fuel leak occurs in the high pressure fuel piping between the injection pump and fuel nozzleThis requires immediate repair because of the （）A
high cost of fuelB
serious fire hazardC
possibility of pollutionD
poor combustion which will occur in that cylinder
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The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）A
Proper timingB
Accurate meteringC
Suitable injection rateD
Suitable atomization rate
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 problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）A
Fuel injection timing will changeB
Nozzle operation will be unaffectedC
Fuel will leak into the drain lineD
Fuel will not be delivered
考题
单选题According to the passage, which of the following about Dickens is TRUE?A
He was a peaceful person.B
He was a quiet writer.C
He worked very hard at school.D
He cared a lot about things around him.
考题
单选题When a fuel injection nozzle overheats, which of the problems listed can be expected?（）A
The fuel metering will varyB
The fuel will explodeC
The cylinder head will crackD
The engine will stop
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考题
单选题Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）A
Common-rail injectionB
Air injectionC
Jerk pump injectionD
Distribution injection
考题
单选题According to the passage, which of the following about Dickens is TRUE?A
He was a peaceful person.B
He was a quiet writer.C
He worked ver)r hard at school.D
He cared a lot about things around him.
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