题目内容

The( ) cooling system needs least maintenance work for( ) in this kind of system.

A. Open; the minimum components
B. Open; the high cooling efficiency
Central ; there are more coolers and a extra set of pumps
D. Central ; there is only one component contacts seawater

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In the engine system, heat exchanger tubes are frequently attacked by sea water because of ( ) within the tubes causing pitting and eventual leakage.

A. hitting
B. circulating
C. locking
D. turbulence

The cylinder jacket cooling water after leaving the engine passes to a sea water circulating cooler,( ) and then into the jacket water circulating pumps.

A. condenser
B. evaporator
C. separator
D. heat exchanger

In a common sea water cooling system, from the sea suction one of a pair of sea water circulating pumps provides sea water which circulates the lubricating oil cooler, the jacket water cooler and the piston water cooler before( )

A. cooling
B. heating
C. sucking
D. discharging overboard

In an emergency situation, for example in the event of damage to a fresh water cooler or generator, the ( ) can be used to supply sea water to the fresh water cooling system.merely by removing the blind-flanges.

A. sea water cooler or generator
B. emergency fire fighting pump
C. fresh water pumps
D. sea water pumps