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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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suction side of the centrifugal pumpC
the lowest point of the cooling water systemD
inlet of the main engine
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单选题（） allows for expansion and water make up in the water cooling system.A
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A head tankC
A head valveD
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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
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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
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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
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Stop EngineC
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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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Each totally enclosed cooling system shall be provided with a suitable head tankD
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slightly acidic conditionB
slightly alkaline conditionC
overtreatment of waterD
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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
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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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