海船船员考试

单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longerA (1) onlyB (2) onlyC both (1) and (2)

题目
单选题
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer
A

(1) only

B

(2) only

C

both (1) and (2)

D

neither (1) nor (2)

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相似问题和答案

第1题：

A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.

A.increasing the linear velocity of the exhaust gases

B.changing directions of exhaust gas flow

C.decreasing the temperature of the exhaust gases

D.accelerating the exhaust gas through a reduced size orifice


正确答案：B

第2题：

Immediately after any diesel engine is started, the engineer should check the ______.

A.crankcase pressure

B.lube oil pressure

C.saltwater pressure

D.exhaust temperature


正确答案：B

第3题：

High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).

A.decreased piston to cylinder head clearance

B.increased exhaust system back pressure

C.early fuel injection timing

D.low scavenge air temperature


正确答案：C
解析：decrease：减少;clearance：间隙
译文：喷油定时过早会引起柴油机爆炸压力偏高、排温偏低。

第4题：

单选题
Poor combustion in a diesel engine can be caused by （）.
A

high compression pressure

B

low intake air temperature

C

low exhaust pressure

D

high scavenge air temperature


正确答案： D
解析： 暂无解析

第5题：

单选题
If a diesel engine were running at 20% overload with a smoky exhaust, you should（）
A

stop the engine immediately to prevent damage

B

increase lube oil pressure

C

slow the engine allowing it to gradually cool

D

decrease the cooling water it temperature to the water jacket


正确答案： A
解析： 暂无解析

第6题：

A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke

A.①

B.②

C.① and ②

D.Neither ① nor ② is correct


正确答案：A

第7题：

单选题
Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
A

natural aspiration

B

masked intake valves

C

air cells

D

scavenging air


正确答案： B
解析： 暂无解析

第8题：

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by

A.natural aspiration

B.masked intake valves

C.air ceils

D.scavenging air


正确答案：D

第9题：

单选题
One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）
A

reduce lube oil temperature

B

raise exhaust temperature reduce

C

excessive heating of engine room

D

reduce load on cooling water pump


正确答案： C
解析： 暂无解析

第10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

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