to cut down the amount of cooling water needed
to prevent an excess amount of cooling water from being discharged to the bilges
to supply hot water to the evaporator for more economical operation
None of the above is tree
第1题：
Why is it necessary to have routine testing of the cooling water?
A.To ensure that the proper residuals of treatment chemicals, as specified, are maintained all time
B.To trace leakage in the cooling water system
C.It is not necessary
D.To detect the presence of contaminants in the water that may be injurious to the cooling system
第2题：
______is the number of millimeters by which the mean draft changes when a ship passes from salt water to fresh water，or vice versa，whilst floating at the loaded draft．
A.TPC
B.The Fresh Water Allowance
C.Parallel sinking of the ship
D.UKC
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：
An open vent in the cooling system
A fouled sea chest
A restricted water passage in the engine
Air entrained in the cooling water
第5题：
Heat exhaustion is caused by excessive ______.
A.loss of body temperature
B.loss of water and salt from the body
C.gain in body temperature
D.intake of water when working or exercising
第6题：
When is the density of the water required to be logged in the logbook of a ship?
A.Any time the vessel moves from water of one density into waters of a different density
B.Prior to getting underway when the vessel is floating in fresh or brackish water
C.Only when the vessel moves from fresh water into salt water
D.The density of the water is not required to be logged in the unofficial logbook
第7题：
A fire in a ballast pumproom can be brought under control with minimal impact on stabilityby ___________.
A.cooling the outside bulkheads with water
B.shutting all sources of air into the compartment
C.closing the sea chest
D.flooding the compartment with salt water
第8题：
High diesel engine cooling water temperatures can be caused by ______.
A.air in the cooling system
B.an overhauled water pump
C.correct amount of coolant
D.no air in the cooling system
第9题：
150 millimeters of water pressure
125 millimeters of water pressure
100 millimeters of water pressure
75 millimeters of water pressure
第10题：
fresh water expansion tank
sea water expansion tank
thermostatic expansion valve
jacket water cooler accumulator