海船船员考试

单选题Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.A specific volumeB densityC viscosityD calorific value

题目
单选题
Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.
A

specific volume

B

density

C

viscosity

D

calorific value

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相似问题和答案

第1题：

A frontal thunderstorm is caused by ______.

A.pronounced local heating

B.wind being pushed up a mountain

C.a warm air mass rising over a cold air mass

D.an increased lapse rate caused by advection of warm surface air


正确答案：C
雷暴天气是由于暖气团的上升超过冷气团造成的。

第2题：

单选题
A substantial increase pressure could be an indication of a/an （）
A

worn cylinder liner

B

faulty cylinder relief valve

C

excessive lube oil pressure

D

excessive scavenge air pressure


正确答案： D
解析： 暂无解析

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
Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）
A

an increase in the exhaust temperature of the affected cylinder

B

the turbocharger may surge

C

the explosion pressure in all cylinders will rise violently

D

smoke from the turbocharger air inlet filter will be seen


正确答案： D
解析： 暂无解析

第5题：

单选题
The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.
A

behind

B

far from

C

adjacent to

D

in front of


正确答案： A
解析： 暂无解析

第6题：

One of the best ways for people to keep fit is to__________healthy eating habits.

A.grow
B.develop
C.increase
D.raise

答案：B
解析：
考情点拨：本题考查动词辨析。应试指导：句意：人们要保持健康的最佳方式之一就是养成健康的饮食习惯。develop发展；grow、成长；increase加大，增加；raise提高。

第7题：

单选题
Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）
A

the lubricating oil consumption

B

the turbine blade temperature

C

the flow rate of fuel

D

scavenge air pressure


正确答案： A
解析： 暂无解析

第8题：

What is the purpose of limber holes ________．

A.To allow for air circulation

B.To allow for stress and strain in rough waters

C.To allow water in the boat to drain overboard

D.To allow water in the bilge to get to the boat drain


正确答案：D

第9题：

单选题
Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）
A

amount of scavenge air to the cylinder

B

quality of fuel injected

C

viscosity of the lube oil

D

compression ratio of the piston


正确答案： A
解析： 暂无解析

第10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

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