海船船员考试

单选题Most fuel injection nozzles are opened by （）.A fuel oil pressureB a cam operated followerC a spring-loaded pressure plateD timing gears keyed to the crankshaft

题目
单选题
Most fuel injection nozzles are opened by （）.
A

fuel oil pressure

B

a cam operated follower

C

a spring-loaded pressure plate

D

timing gears keyed to the crankshaft

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相似问题和答案

第1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2题：

单选题
Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）
A

employing fuel oil as a cooling medium

B

preventing hard carbon deposit on nozzle tips

C

avoiding fuel oil temperature exceeding builder’s specification

D

ensuring good metallic contact between nozzles and cylinder heads


正确答案： D
解析： 暂无解析

第3题：

_______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.

A.Excessive fuel nozzle holder cooling

B.Sediment in the fuel supply

C.Distortion of the fuel spray pattern

D.Improper atomization of the fuel


正确答案：B

第4题：

单选题
Failure of fuel injection is usually due to trouble in the （）.
A

exhaust valves

B

mechanical lubricators

C

cooling water pumps

D

fuel injection pumps


正确答案： D
解析： 暂无解析

第5题：

单选题
The burning of fuel oil in a diesel engine having a high sodium content, will cause （）
A

corrosion and grooving of exhaust valves

B

corrosion and gumming of the fuel injection pump

C

salt deposits in the exhaust manifold

D

slag deposits in the fuel injection equipment


正确答案： A
解析： 暂无解析

第6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7题：

单选题
If the needle valve in a fuel injection nozzle sticks open （）.
A

no fuel will be delivered through the nozzle

B

the nozzle will overheat and crack

C

time of injection will change

D

fuel will leak into the drain line


正确答案： B
解析： 暂无解析

第8题：

单选题
The main purpose of changing main engine to electronic controlled is not to（）
A

control fuel injection time more precisely

B

control fuel injection rate more precisely

C

meet the environmental requirements

D

meet high engine speed requirements


正确答案： B
解析： 暂无解析

第9题：

单选题
On most diesel engines, the governor controls the output speed by （）.
A

controlling the amount of fuel injected into the cylinders

B

varying the speed of the turbocharger

C

adjusting the compression ratio

D

changing the timing of the fuel injection camshaft


正确答案： C
解析： 暂无解析

第10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

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