The cooling water temperature （） over a period of 8 hours, a

第1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2题

The temperature of the refrigerant in the evaporator coil depends mostly upon the ___.A.refrigerant pressure in the evaporatorB.cooling water temperature to the condenserC.heat load in the refrigerator compartmentD.solenoid valve in the liquid line

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第3题

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 operating rangeD lube oil in the cooling water

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第4题

单选题An over-speed trip stops a diesel engine when the engine （）A runs out of fuelB has low lubricating oil pressureC exceeds a set maximum speedD has high cooling water temperature

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第5题

单选题One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）A reduce lube oil temperatureB raise exhaust temperature reduceC excessive heating of engine roomD reduce load on cooling water pump

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第6题

单选题If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）A a dirty lube oil strainerB internal water leaksC an oil suction line restrictionD excessive wears of the cooling water pump

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第7题

单选题A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.A around the engineB around the coolerC to the expansion tankD overboard

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