海船船员考试

单选题On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.A slowB quickC arrang

题目
单选题
On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.
A

slow

B

quick

C

arranged

D

high

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相似问题和答案

第1题：

Injectors for use with heavy fuel oil must be cooled by either water or light oil to_____.

A.prevent heat corrosion to internal components

B.increase fuel delivery rate and economy

C.prevent pre-ignition

D.avoid carbonization of the nozzle tips


正确答案：D

第2题：

Which lubricating oil additive is used in diesel engines to reduce the tendency(倾向)for sludge and varnish to form on the engine parts?

A.Flash point improvers

B.Pour point improvers

C.Inhibitors

D.Foam suppressors(抑制物)


正确答案：C

第3题：

Main engines as well as auxiliary engines operating on heavy fuel should have continuousoon the lubricating oil, either according tothebypass or batch principles

A.filtering

B.centrifuging

C.depositing

D.operating


答案：B

第4题：

单选题
One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）
A

high TBN value

B

low oil floc point

C

low oil demulsibility

D

low oil neutralization number


正确答案： A
解析： 暂无解析

第5题：

单选题
The primary purpose of oil control rings on a diesel piston is to（）
A

provide a reservoir for cylinder lubrication

B

pump oil into the combustion space for cylinder cooling

C

prevent excessive lubricating oil consumption

D

allow hydraulic oil film formation on the cylinder


正确答案： A
解析： 暂无解析

第6题：

In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .

A.all of the oil used by the engine through a filter

B.some of the oil used by the engine through a filter

C.some of the oil used by the engine through a centrifuge

D.all of the oil used by the engine through a centrifuge


正确答案：C

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：

For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by

A.moving the governor control to stop

B.shutting off the lubricating oil supply

C.tripping the governor emergency stop lever

D.shutting off the fuel supply


正确答案：D

第9题：

单选题
For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）
A

moving the governor control to stop

B

shutting off the lubricating oil supply

C

tripping the governor emergency stop lever

D

shutting off the fuel supply


正确答案： D
解析： 暂无解析

第10题：

单选题
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.
A

oil spray

B

oil bath

C

oil control rings

D

drilled passage through the camshaft


正确答案： B
解析： 暂无解析

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