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单选题
Adequate attention must be given to the water cooling system of the air compressors, for （） can cause condensation on the cylinder walls.
A
overcooling
B
poor cooling
C
overloading
D
unloading
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An open vent in the cooling systemB
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fresh water expansion tankB
sea water expansion tankC
thermostatic expansion valveD
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单选题After "F.W.E" is given, the air system is shut down, the （） gear put in, all drains and indicator cocks opened, and the cooling water kept running.A
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turningD
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单选题If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）A
air binding of the engine cooling systemB
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单选题Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）A
discharge side of the centrifugal pumpB
suction side of the centrifugal pumpC
the lowest point of the cooling water systemD
inlet of the main engine
考题
单选题（） allows for expansion and water make up in the water cooling system.A
A top tankB
A head tankC
A head valveD
A drain tank
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单选题High diesel engine cooling water temperatures can be caused by （）.A
air in the cooling systemB
an overhauled water pumpC
correct amount of coolantD
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单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）A
improper venting of the cooling systemB
carrying the expansion tank water level too highC
a totally clogged impeller in the cooling water pumpD
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单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A
reduce water temperatureB
reduce water turbulenceC
provide an air cushionD
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单选题After the order “（）” is given, the air system is shut down, the turning gear put in, all drains and indicator cocks opened, and the cooling water and lubricating oil systems kept running.A
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Stop EngineC
Finished With EngineD
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jacket water outletB
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sea water temperature must never be warmer than 40℃B
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jacket water pressure must always be less than the sea water pressure
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loss of suction in the circulating pumpB
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broken raw water pump shaftD
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单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
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remove some refrigerant from the system
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单选题Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）A
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Propulsion engines with bores over 200 mm are to be fitted with cooling water jacketsC
Each totally enclosed cooling system shall be provided with a suitable head tankD
Drain cocks are to be provided at the lowest points of all cylinder water jackets
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单选题In a diesel engine cooling water system, a pH of 60 indicates a/an （）.A
slightly acidic conditionB
slightly alkaline conditionC
overtreatment of waterD
neutral condition of water
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单选题In the process of the stand-by, warm-up the engine usually through give preheat of which parts of the diesel engine?（）A
cooling water of the cooling systemB
fuel of the FO systemC
LO of the LO systemD
cooling water of the cooling system and LO of the LO system
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单选题If the compressor-discharge temperature is higher than the receiver temperature（）A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
add more refrigerant to the systemD
remove some of the refrigerant from the system
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