海船船员考试

单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）A a low level in the engine expansion tankB excessively high coolant pressureC improper temperaturesD malfunctioning of the ja

题目
单选题
If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）
A

a low level in the engine expansion tank

B

excessively high coolant pressure

C

improper temperatures

D

malfunctioning of the jacket water heater

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相似问题和答案

第1题：

单选题
If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）
A

a broken shaft on the freshwater pump

B

an excessive accumulation of scale exchanger

C

an incorrect thermostatic element operating range

D

lube oil in the cooling water


正确答案： D
解析： 暂无解析

第2题：

单选题
Which operation should be done when launching an inflatable liferaft by hand?（）
A

Open the liferaft casing

B

Turn the valve on the CO2 cylinder to start inflation

C

Make sure the operating cord is secured to the vessel before throwing it over the side

D

After inflation，detach operating cord from liferaft


正确答案： C
解析： 暂无解析

第3题：

If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).

A.a broken shaft on the freshwater pump

B.an excessive accumulation of scale in the heat exchanger

C.an incorrect thermostatic element operating range

D.lube oil in the cooling water


正确答案：B
解析：gradually：逐渐地;accumulation：累积;scale：结垢;thermostatic：恒温的;range：范围
译文：如果一个柴油机内的闭式冷却系统内的冷却介质温度逐渐升高，则通常的原因是热交换器内有过多的积垢。

第4题：

单选题
A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.
A

open

B

close

C

remain in its position

D

flood the evaporator with refrigerant


正确答案： B
解析： 暂无解析

第5题：

单选题
A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.
A

around the engine

B

around the cooler

C

to the expansion tank

D

overboard


正确答案： B
解析： 暂无解析

第6题：

单选题
During working, thermostatic expansion valve should be （）.
A

either all the way open or all the way closed

B

normally fully open

C

throttled depending on load

D

controlled by liquefied pressure


正确答案： D
解析： 暂无解析

第7题：

单选题
When operating the air supply system in a covered lifeboat the（）.
A

fuel supply valve should be closed

B

hatches，doors，and oar ports should be closed

C

air cylinder shut-off valve should be closed

D

engine should be shut off


正确答案： D
解析： 暂无解析

第8题：

A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/an

A.evaporator pressure decrease

B.evaporator coil over-feed

C.evaporator capacity increase

D.expansion valve diaphragm rupture


正确答案：B

第9题：

单选题
A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.
A

a pressure reducing valve

B

a pilot valve

C

an operating piston

D

downstream pressure


正确答案： D
解析： 暂无解析

第10题：

单选题
What is the function of thermostatic expansion valve in a compression refrigeration system?（）
A

nonexistent

B

for controlling pressure

C

for controlling superheat

D

for controlling the solenoid valve


正确答案： B
解析： 暂无解析

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