海船船员考试

单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.A assist in a quick cutoff of fuel injectionB allow oil backflow from the injector to the helixC reduce fuel oil pressure between injection strokesD meter the qu

题目
单选题
The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
A

assist in a quick cutoff of fuel injection

B

allow oil backflow from the injector to the helix

C

reduce fuel oil pressure between injection strokes

D

meter the quantity of fuel delivered

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相似问题和答案

第1题：

单选题
The main purpose of starting the diesel engine on air briefly is（）
A

to inspect if the cylinder has the water leakage

B

to expel out the residual water/gas/oil from the cylinder

C

to check if fuel supply is normal

D

A and B


正确答案： D
解析： 暂无解析

第2题：

单选题
Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.
A

control the back pressure of return oil

B

lock the oil lines under some conditions

C

change the direction of oil flow

D

act as relief valve


正确答案： B
解析： 暂无解析

第3题：

A Kort nozzle is a(n) ______.

A.hollow tube surrounding the propeller used to improve thrust

B.nozzle attached to a firefighting hose

C.intake valve on a diesel engine

D.piston cylinder on a diesel engine


正确答案：A
Kortnozzle（科特导流管）是中间空心的，在螺旋桨周围的用来提高侧推力的导流管。

第4题：

单选题
Diesel engine cylinder head test cocks are used to（）
A

check cylinder lubrication prior to starting engine

B

connect exhaust gas analyzers to determine engine efficiency

C

pressure test cylinder heads to check for leaks

D

remove moisture accumulations from cylinder prior to starting


正确答案： D
解析： 暂无解析

第5题：

单选题
Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）
A

the direct acting relief valve is used for controlling lower flows and pressure

B

the pilot operated relief valve is used for controlling higher flows and pressure

C

the pilot operated relief valve is used for controlling lower flows and pressure

D

the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve


正确答案： C
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
Which of the valves listed should be used either in the fully opened or the fully closed position?（）
A

A gate valve

B

A globe valve

C

Any check valve

D

Any needle valve


正确答案： C
解析： 暂无解析

第8题：

单选题
A check valve is another name for （）.
A

a test valve

B

an inspection valve

C

a stop valve

D

a non-return valve


正确答案： D
解析： 暂无解析

第9题：

单选题
The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）
A

compensate for low oil level

B

increase governor promptness

C

prevent governor hunting

D

limit engine load


正确答案： A
解析： 暂无解析

第10题：

单选题
Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
A

fuel oil vapor at the sludge tank vent

B

unburned fuel vapors in the scavenge air receiver

C

lube oil vapors in the crank case

D

lube oil vapors in the engine room


正确答案： C
解析： 暂无解析

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