The main engine is cooled with fresh water （）is added suitable small quantities of chemicals to prevent corrosion.

相似题目

• Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）

  A . An alarm device with audible and visible signals is required for all cooling water systems B . Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets C . Each totally enclosed cooling system shall be provided with a suitable head tank D . Drain cocks are to be provided at the lowest points of all cylinder water jacket

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• Who is in charge of the main engine?（）

  A . The chief engineer B . The second engineer C . The third engineer D . The fourth engineer

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• Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.

  A . cylinder covers B . lubricating space C . crosshead D . exhaust manifold

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• The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）

  A . manifold B . condenser C . chamber D . plenum

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• One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）

  A . reduce lube oil temperature B . raise exhaust temperature reduce C . excessive heating of engine room D . reduce load on cooling water pum

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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• The main purpose of changing main engine to electronic controlled is not to（）

  A . control fuel injection time more precisely B . control fuel injection rate more precisely C . meet the environmental requirements D . meet high engine speed requirement

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• A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.

  A . cylinder heads B . exhaust valves C . scavenging air D . injector

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• The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）

  A . regulating the level of corrosion inhibitor in the primary cooling system B . the level of the freshwater expansion tank C . varying the engine load to meet temperature requirements D . the operation of the thermostatic valve

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• The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.

  A . reduce water temperature B . reduce water turbulence C . provide an air cushion D . allow for an increase in water volume as the engine warms u

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• The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the （）.

  A . turbocharger stalls B . exhaust pressure increases C . air charge density decreases D . scavenge effect increase

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• About half an hour before the engine is required, cooling water at （） must be circulated.

  A . more than the working temperature B . less than the working temperature C . the working temperature D . the same as the surrounding temperature

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• 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 water B . reduces the capability of the lubrication system C . can form pockets which block the flow of coolant through the system D . leads to the scuffing of cylinder wall

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• During the running of the diesel engine, if the supply of cooling water is interrupted or the temperature of cooling water out of the cylinder is too high, the duty engineer should （）

  A . notify the duty officer, reduce the engine speed, take some measures to remove failures B . notify the duty officer and stop the engine immediately, find the cause and remove failures C . notify the C/E D . notify the captai

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• Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）

  A . Defective temperature controls in the system B . Cavitation in the cooling water pump C . Opened vent in the cooling system D . Restricted water passages in the engine

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• 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 pump B . an excessive accumulation of scale exchanger C . an incorrect thermostatic element operating range D . lube oil in the cooling water

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• With UMS, when the engine room is unwatched （） will control the main engine.

  A . the bridge officer on watch B . the chief engineer C . the duty engineer D . the duty motorma

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• Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）

  A . Air will enter the cooling system B . Carbon will plug the water cooled exhaust manifolds C . The jacket water temperature will rise D . The lube oil viscosity will increase

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• Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.

  A . a brief trial with turning gear B . a brief trial on power C . a long trial by steering gear D . one minutes trial with windla

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• Which of the following statements is correct concerning diesel engine cooling water systems?（）

  A . Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operation B . propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinder C . At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangers D . Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling

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• The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.

  A . to be kept B . logged C . changed D . has remained

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• Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

  A . boiler B . heater C . engine D . cooler

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• The purpose of treating the cooling water of the diesel engine is to（） Ⅰ. resist the scale formation in the cooling chamber Ⅱ.lubricate the engine part Ⅲ.increase thermal capacity Ⅳ.resist corrosion

  A . Ⅰ+Ⅱ B . Ⅱ+Ⅲ C . Ⅲ+Ⅳ D . Ⅰ+Ⅳ

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• The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the _____.

  A.turbocharger stalls B.exhaust pressure increases C.air charge density decreases D.scavenge effect increases

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