单选题If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）A a broken shaft on the freshwater pumpB an excessive accumulation of scale exchangerC an incorrect thermostatic element opera

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单选题

If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

a broken shaft on the freshwater pump

an excessive accumulation of scale exchanger

an incorrect thermostatic element operating range

lube oil in the cooling water

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第1题

What is head tank in the closed cooling water system used for?A.for the release of air from the cooling waterB.providing expansion room for heated cooling waterC.a place for implementing water and water treatment agentD.all of the above

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第2题

If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).A.a broken shaft on the freshwater pumpB.an excessive accumulation of scale in the heat exchangerC.an incorrect thermostatic element operating rangeD.lube oil in the cooling water

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第3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 regulatorB.thermostatic bypass valveC.sea water temperatureD.water level in the expansion tank

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第4题

The most serious effect of air trapped in a diesel engine jacket water cooling system is that it ______．A.Causes colloid suspension in the cooling waterB.Reduces the capability of the lubrication systemC.Can form pockets which block the flow of coolant through the systemD.Leads to the scuffing of cylinder walls

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第5题

单选题The pH value of water in a diesel engine closed cooling water system should be maintained between （）.A 60 to75B 80 to 95C 100 to 115D 120 to 135

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第6题

单选题What is head tank in the closed cooling water system used for?（）A for the release of air from the cooling waterB providing expansion room for heated cooling waterC a place for implementing water and water treatment agentD all of the above

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第7题

单选题In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）A An open vent in the cooling systemB A fouled sea chestC A restricted water passage in the engineD Air entrained in the cooling water

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If the coolant temperature of a closed cooling water system

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