海船船员考试

单选题In describing basic diesel engine operation，the term ‘event’ refers to （）A the production of high pressure gasesB the removal of expended combustion gasesC the admission of air to the cylinderD all of the above

题目
单选题
In describing basic diesel engine operation，the term ‘event’ refers to （）
A

the production of high pressure gases

B

the removal of expended combustion gases

C

the admission of air to the cylinder

D

all of the above

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相似问题和答案

第1题：

Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.

A.increase power output

B.decrease lube oil viscosity

C.eliminate fuel knock

D.cause sulfuric acid formation


正确答案：D

第2题：

单选题
The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.
A

principle

B

principal

C

cause

D

case


正确答案： D
解析： 暂无解析

第3题：

For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because

A.changing filter elements would not interrupt engine operation

B.filtering occurs twice in each pass of oil through the system

C.clogging will not occur

D.dropping pressure is half of that through a single filter unit


正确答案：A

第4题：

单选题
What determines the number of events occurring in a cycle of operation in an internal combustion engine?（）
A

Crankshaft revolution

B

Type of engine (diesel or gasoline)

C

Distance a piston travels during a stroke

D

Number of pistons


正确答案： B
解析： 暂无解析

第5题：

单选题
A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.
A

slow-speed diesel

B

medium-speed diesel

C

high-speed diesel

D

constant-speed diesel


正确答案： C
解析： 暂无解析

第6题：

During the valve overlap period, the exhaust pressure of a turbocharged four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure ______.

A.effective cylinder scavenging and cooling

B.constant pressure from the turbochargers

C.cooler operation of the exhaust system

D.effective constant pressure for turbocharger operation


正确答案：A

第7题：

单选题
Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A

operated manually once an hour

B

operated until the engine has started

C

placed into operation only at maximum load

D

adjustable to meet lubrication requirements


正确答案： B
解析： 暂无解析

第8题：

Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except______.

A.open the indicator cocks

B.supply some CYL.Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)

C.put the fuel handle in the "stop" position

D.pump up the air bottle


正确答案：D

第9题：

单选题
If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）
A

air binding of the engine cooling system

B

a cracked water cooled exhaust manifold

C

blockage in the heat exchanger

D

faulty operation of the thermostat


正确答案： B
解析： 暂无解析

第10题：

单选题
In describing engine operation, what does the term “cycle” mean?（）
A

The sequence of events that produce a power pulse

B

One rotation of the engine crankshaft

C

One stroke of a piston

D

All of the above


正确答案： C
解析： 暂无解析

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