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单选题 The pH value of water in a diesel engine closed cooling water system should be maintained between _____
学科：船舶柴油机操作与维修
时间：2023-11-17 23:32:02
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题目1单选题
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a ____A. loss of suction in the circulating pumpB. leak in the primary cooling systemC. broken raw water pump shaftD. burned or cracked piston in one cylinder
题目2单选题
The pH value of water in a diesel engine closed cooling water system should be maintained between _____A. 6.0 to7.5B. 8.0 to 9.5C. 10.0 to 11.5D. 12.0 to 13.5
题目3单选题
The cooling water of diesel engine should be treated because the ___A. cooling water is alkalescenceB. cooling water has acidityC. cooling water has salinityD. cooling water has impurity
题目4单选题
With _____, the corrosion problems are much reduced in a central cooling systemA. no equipment in contact with sea waterB. less equipment in contact with fresh waterC. more equipment in contact with sea waterD. less equipment in contact with sea water
题目5单选题
The ___________ cooling system needs least maintenance work for _____________________ in this kind of systemA. open, the minimum componentsB. open, the high cooling efficiencyC. central, there are more coolers and a extra set of pumpsD. central, there is only one component contacts seawater
题目6单选题
In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of _____A. oilB. sea waterC. airD. fresh water
题目7单选题
In a common oil cooler circulated by sea water, the oil is at a ____ pressure than the sea waterA. largerB. safetyC. lowerD. bursting
题目8单选题
Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent _____A. excessive crankcase pressureB. excessive lube oil temperatureC. contamination of the lube oil by waterD. contamination of the cooling water by lube oil
题目9单选题
The piston cooling system may employ similar components, except that _____ is used instead of a head tankA. a sump tankB. a feed wellC. a double bottom tankD. a drain tank
题目10单选题
Where is the cooling water from the compensating tank in the cooling water system of main engine lead toA. 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
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