In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
1、In a refrigeration system, if the cool
In a refrigeration system, if the cooling water to the condenser fails, the（）.Abox temperature solenoid valve will closeBexpansion valve will closeCcompressor will shutdownDking valve will ope
2、In a central cooling system, used in s
In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.Afresh waterBsea waterCcooling oilDemulsio
3、In a closed cooling water system, whic
In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）AAn open vent in the cooling systemBA fouled sea chestCA restricted water passage in the engineDAir entrained in the cooling water
4、In a central cooling system, used in s
In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.Amain bearingsBsea waterCcooling oilDlower temperature fresh water
5、Clearance volume scavenging in a turbo
Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.Aduring the valve overlap periodBwith only the exhaust valve openCat a pressure below atmosphericDwithout cooling the cylinders or pisto
6、In a closed diesel engine freshwater c
In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.Asuction pressure regulatorBthermostatic bypass valveCsea water temperatureDwater level in the expansion tank