loss of suction in the circulating pump
leak in the primary cooling system
broken raw water pump shaft
burned or cracked piston in one cylinder
第1题：
A.Low level is monitored on the drain tank and header tank.
B.If there is high differential the filters pressure across the circulating
pumps is alarmed
C.The lubricating oil purifier cannot take oil from the drain tank
D.If the sea water pressure falls, this also operates an alarm
第2题：
In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.
A.suction pressure regulator
B.thermostatic bypass valve
C.sea water temperature
D.water level in the expansion tank
第3题：
What is head tank in the closed cooling water system used for?
A.for the release of air from the cooling water
B.providing expansion room for heated cooling water
C.a place for implementing water and water treatment agent
D.all of the above
第4题：
for the release of air from the cooling water
providing expansion room for heated cooling water
a place for implementing water and water treatment agent
all of the above
第5题：
Because the circulating water is in a closed loop,_______is installed to cater for expansion and contraction of the water at different conditions of operation.
A.an expansion joint
B.a drain tank
C.a head tank
D.a contraction tank
第6题：
A.Low pressure of the lubricating oil
B.Low level of the lubricating oil
C.High temperature of the lubricating oil
D.High temperature of the cooling water
第7题：
The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?
A.Faulty thermostatic bypass valve
B.Eroded zinc pencils in the heat exchanger
C.Steam formation in the expansion tank
D.Excessive leakage from jacket water pump seals
第8题：
An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that .
A.the expansion tank is lack of water
B.the expansion tank is over flowing
C.there is something wrong with the cooling system
D.there is something wrong with the engine
第9题：
_____ allows for expansion and water make up in the water cooling system.
A.A top tank
B.A head tank
C.A head valve
D.A drain tank
第10题：
fresh water expansion tank
sea water expansion tank
thermostatic expansion valve
jacket water cooler accumulator