海船船员考试

单选题A （） in the air delivery line near to each compressor is essential.A butterfly valveB globe valveC gate valveD non-return valve

题目
单选题
A （） in the air delivery line near to each compressor is essential.
A

butterfly valve

B

globe valve

C

gate valve

D

non-return valve

参考答案和解析
正确答案： C
解析： 暂无解析
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相似问题和答案

第1题：

压气机在线清洗（on-line compressor washing）


正确答案: 在燃气轮机带负荷情况下，通过向压气机进气口喷射清洁液而进行清洗压气机的方法。

第2题：

单选题
On opposite ends of a single shaft of a turboblower are a gas driven （）and a air compressor, which are sealed each other.
A

charge air receiver

B

scavenging air belt

C

turbine

D

air cooler


正确答案： C
解析： 暂无解析

第3题：

On a weather map, a large letter “H” means ______.

A.a high pressure area with cool, dry air, and fair weather

B.a high pressure area with warm, moist air, and inclement weather

C.horse latitudes, with rough seas and strong winds

D.a heavy squall line near the “H”


正确答案：A
在天气图上大写字母H的意思是伴随阴凉，干燥和晴好天气的高压。

第4题：

单选题
Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.
A

maintain adequate coil back pressure

B

prohibit flashing in the liquid line

C

reduce refrigerant volume in the system

D

reduce compressor discharge line loading


正确答案： A
解析： 暂无解析

第5题：

单选题
The unloading system on an air compressor will （）.
A

increase compressor discharge pressure on demand

B

increase compressor operating speed as necessary

C

allow the motor to turn the compressor opposed only by friction

D

reduce the compressor frictional load when starting


正确答案： C
解析： 暂无解析

第6题：

单选题
Air blowing from the intake air filter of an operating air compressor indicates （）.
A

broken inlet valves

B

broken discharge valves

C

pulsations in the air distribution system

D

overloading of the air distribution system


正确答案： A
解析： 暂无解析

第7题：

单选题
On a weather map,a large letter “h” means（）
A

a high pressure area with cool, dry air and fair weather

B

a high pressure area with warm, moist air and inclement weather

C

horse latitudes, with rough seas and strong winds

D

a heavy squall line near the “H”


正确答案： A
解析： 暂无解析

第8题：

what is the use of “unloader “on main air compressor ?


正确答案：The unloader on air compressor is used to reduce the high starting torqueduring starting and also provide a means of draining out the accumulating oil water .

第9题：

单选题
In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
A

broken valve springs

B

tight drive belts

C

high line voltage

D

air in the system


正确答案： A
解析： 暂无解析

第10题：

单选题
A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.
A

the low inertia

B

the high inertia

C

the low velocity

D

the high velocity


正确答案： A
解析： 暂无解析

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