海船船员考试

单选题The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.A two-strokeB four-stokeC long-strokeD short-stroke

题目
单选题
The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.
A

two-stroke

B

four-stoke

C

long-stroke

D

short-stroke

参考答案和解析
正确答案： B
解析： 暂无解析
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相似问题和答案

第1题：

低速控制（）

  • A、low-speed control
  • B、inching control
  • C、high-speed control
  • D、slow-speed control

正确答案:B

第2题：

Which of the following commands will set the duplex of a network adapter？（）

  • A、no -a media_speed=100_Full_Duplex en0
  • B、ifconfig -a media_speed=100_Full_Duplex ent0
  • C、chdev -l ent0 -a media_speed=100_Full_Duplex
  • D、chinet -l en0 -a media_speed=100_Full_Duplex en0

正确答案:C

第3题：

Each cylinder liner on the marine medium speed engines _____.

A.is usually cooled by sea water

B.can be replaced when worn out

C.is in direct contact with the water in the bore of the cylinder

D.can t expand when heated


正确答案：B

第4题：

单选题
An over-speed trip stops a diesel engine when the engine （）
A

runs out of fuel

B

has low lubricating oil pressure

C

exceeds a set maximum speed

D

has high cooling water temperature


正确答案： B
解析： 暂无解析

第5题：

单选题
Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）
A

To prevent internal damage form local overheating

B

To ensure the fuel nozzles are flushed clean

C

To clear the smoke stack

D

To let the waste heat boiler reduce its rate of steam generation


正确答案： D
解析： 暂无解析

第6题：

极低速控制.（）

  • A、Low speed control .
  • B、Inching control .
  • C、High speed control.
  • D、Slow speed control.

正确答案:B

第7题：

单选题
（）are increasingly used as main engine on merchant vessels, because they have a high Hp/Weight ratio.
A

Slow speed diesel engines

B

Medium-speed diesel engines

C

Steam engines

D

Gasoline engines


正确答案： C
解析： 暂无解析

第8题：

One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the_______.

A.governor sensitivity

B.exhaust temperature

C.fuel injection pressure

D.speed of the cam shaft


正确答案：B

第9题：

单选题
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
A

Speed limiting governor

B

Over-speed governor

C

Over-speed trip

D

Over-speed relay


正确答案： D
解析： 暂无解析

第10题：

单选题
Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.
A

a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine

B

a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine

C

two medium-speed, turbocharged, four-stroke diesel engines

D

a variable-speed AC generator


正确答案： A
解析： 暂无解析

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