海船船员考试

单选题During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.A ensure penetration and distribution of the fuel in the combustion chamberB ensure the needle valve is flushed clean during each injectionC prevent combustion gas

题目
单选题
During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
A

ensure penetration and distribution of the fuel in the combustion chamber

B

ensure the needle valve is flushed clean during each injection

C

prevent combustion gas blowback into the open needle valve

D

prevent reflected pressure waves when the needle valve closes

如果没有搜索结果，请直接 联系老师 获取答案。
如果没有搜索结果，请直接 联系老师 获取答案。
相似问题和答案

第1题：

单选题
The primary function of a fuel delivery check valve assembly is to（）
A

deliver proper fuel quantity to the injection nozzle

B

provide rapid fuel injection cutoff

C

control fuel quantity entering the pump body

D

control fuel pressure delivered to the combustion chamber


正确答案： A
解析： 暂无解析

第2题：

单选题
A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）
A

feel the high pressure fuel line

B

check the cylinder exhausts for white smoke frequently

C

check the cylinder exhaust temperature

D

isolate each cylinder and inspect the injector


正确答案： A
解析： 暂无解析

第3题：

If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the

A.cylinder compression pressure may not be high enough

B.cylinder compression temperature may be too high

C.fuel oil injection pressure may not be high enough

D.scavenge and purge process is incomplete


正确答案：A

第4题：

单选题
A drop in compression pressure in one cylinder of a diesel engine can be caused by（）
A

a leaking fuel injection nozzle

B

a clogged air filter

C

early fuel injection

D

burned valves


正确答案： B
解析： 暂无解析

第5题：

单选题
In the common rail system, excessive pressure in the header may be caused by （）
A

improper adjustment of the bypass valve

B

a dribble in the fuel injection nozzle

C

insufficient leak-off through injection nozzle packing

D

a malfunctioning injection nozzle


正确答案： D
解析： 暂无解析

第6题：

单选题
The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.
A

avoid unnecessary pints inventory

B

keep torsional vibration constant

C

use existing supports and braces

D

maintain specified injection characteristics


正确答案： A
解析： 暂无解析

第7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 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


正确答案： A
解析： 暂无解析

第8题：

单选题
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


正确答案： C
解析： 暂无解析

第9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 fuel

B

serious fire hazard

C

possibility of pollution

D

poor combustion which will occur in that cylinder


正确答案： B
解析： 暂无解析

第10题：

单选题
The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.
A

delivering the same quantity of fuel to each cylinder for each power stroke according to engine load

B

maintaining the metering adjustment for a reasonable period under all load conditions

C

timing fuel injection to obtain maximum power and good fuel economy

D

distributing the fuel to all parts of the combustion chamber for proper combustion


正确答案： D
解析： 暂无解析

更多相关问题
相关内容