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Some of the energy fed into the pump will be dissipated as （

题目
单选题
Some of the energy fed into the pump will be dissipated as （） due to mechanical inefficiencies, the remainder will be converted into pressure rise and fluid velocity.
A

hydraulic head

B

static head

C

heat energy

D

steam

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相似问题和答案

第1题：

If you have ever polished some hard, ()material like metal or marble you know how much energy it takes.

A、tough

B、cooperative

C、capable

D、negative


参考答案：A

第2题：

________is supplied with electricity by main switchboard directly not through sub-board on board

A.Deck machinery

B.Little power load

C.Some important load machinery

D.Stationary submersible pump


正确答案：C

第3题：

They’re doing some very innovative work in solar energy. “innovative” here means something out of date. ()

此题为判断题(对，错)。


参考答案：×

第4题：

Passage Four
How can we get rid of garbage?Do we have enough energy sources to meet our future energy needs?
These are two important questions that many people are asking today．Some people think that man might be able to solve both problems at the same time,They suggest using garbage as an energy source,and at the same time it can save the land to hold garbage．
For a long time,people buried garbage or dumped it on empty land．Now,empty land is scarce．But more and more garbage is produced each year．However,garbage can be a good fuel to use．The things in garbage do not look like coal,petroleum,or natural gas;but they are chemically similar to these fossil fuels．As we use up our fossil-fuel supplies,we might be able to use garbage as an energy source．Burning garbage is not a new idea．Some cities in Europe and the United States have been burning garbage for years．The heat that is produced by burning garbage is used to boil water．The steam that is produced is used to make electricity or to heat nearby,buildings．In Paris,France,some power plants burn almost 2 million metric tons of the cities garbage each year．The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil．
Our fossil fuel supplies are limited．Burning garbage might be one kind of energy source that we can use to help meet our energy needs．This method could also reduce the amount if garbage piling up on the earth．

The best title for the passage may be______

A.Garbage and the Earth
B.Fossil Fuel and Garbage
C.Land and Garbage
D.Garbage?Energy Source

答案：D
解析：
暂无解析

第5题：

Before performing any maintenance on a hydraulic system storing energy in an accumulator, you should

A.pressurize the system to test for leaks

B.bleed off all pressure within the system

C.operate the machine until it reaches normal temperature

D.disconnect the pump pressure control switch


正确答案：B

第6题：

If someone offers you some food that you really don't like, you might say:()

A、I'm fed up.

B、I don't care for that.

C、Sure, I'd love some more.

D、Thanks, but I'm really full.


参考答案：D

第7题：

Before doing any work on a hydraulic system equipped with accumulators, you should

A.drain the accumulators and purge with oxygen

B.bleed off all stored energy from the accumulators completely

C.charge the accumulators to prevent system energy loss

D.pump the hydraulic fluid into the accumulators to prevent fluid loss


正确答案：B

第8题：

A high negative ion count is likely to be found

A．near a pond with a water pump.

B．close to a slow-flowing river.

C．high in some barren mountains.

D．by a rotating water sprinkler.


正确答案：D
解析：第三段第二句话指出，产生大量负离子的自然条件是靠近大海、瀑布或喷泉的地方，或任何有喷水或形成水花的地方。因此答案为D“在旋转的喷雾器旁”。

第9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10题：

Passage Four
How can we get rid of garbage?Do we have enough energy sources to meet our future energy needs?
These are two important questions that many people are asking today．Some people think that man might be able to solve both problems at the same time,They suggest using garbage as an energy source,and at the same time it can save the land to hold garbage．
For a long time,people buried garbage or dumped it on empty land．Now,empty land is scarce．But more and more garbage is produced each year．However,garbage can be a good fuel to use．The things in garbage do not look like coal,petroleum,or natural gas;but they are chemically similar to these fossil fuels．As we use up our fossil-fuel supplies,we might be able to use garbage as an energy source．Burning garbage is not a new idea．Some cities in Europe and the United States have been burning garbage for years．The heat that is produced by burning garbage is used to boil water．The steam that is produced is used to make electricity or to heat nearby,buildings．In Paris,France,some power plants burn almost 2 million metric tons of the cities garbage each year．The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil．
Our fossil fuel supplies are limited．Burning garbage might be one kind of energy source that we can use to help meet our energy needs．This method could also reduce the amount if garbage piling up on the earth．

According to the passage,using garbage is______

A.for heating in France each year
B.a new way in a modern society
C.a good way to solve the problem of energy shortage
D.too expensive as an energy source

答案：C
解析：
暂无解析

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