The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.

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• When abandoning ship and jumping into the water from a substantial height without a life jacket，you should（）.

  A . dive head first，using your hands to break the surface of the water B . hold your arms firmly at your sides and jump feet first C . jump feet first，covering your nose and mouth with one hand and grasping the opposing upper arm with the other D . jump feet first，holding your knees to your chest

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• If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）

  A . place standby cooler in operation B . reduce engine load C . check thermostatic valve D . clean sea water strainer

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• The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）

  A . dry liner B . wet liner C . jacket liner D . corrugated liner

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• When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.

  A . to decrease scale formation B . for better cooling effect C . for more economical purpose D . to raise vacuum

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• In a refrigeration system, if the cooling water to the condenser fails, the（）.

  A . box temperature solenoid valve will close B . expansion valve will close C . compressor will shutdown D . king valve will ope

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• In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）

  A . An open vent in the cooling system B . A fouled sea chest C . A restricted water passage in the engine D . Air entrained in the cooling water

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• When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.

  A . dispose B . dissolve C . heat D . dissipate

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• The cooling water of the diesel engine should be treated, because it has（）

  A . alkale scence B . acidity C . salinity D . impurity

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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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• About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）

  A . an engine-driven；as well B . an engine-driven；has an independent pump C . an independent；as well D . an independent；has an engine-driven pum

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• （） allows for expansion and water make up in the water cooling system.

  A . A top tank B . A head tank C . A head valve D . A drain tank

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• A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）

  A . reduce heat radiation to the engine room B . aid in preventing turbocharger overheating C . condense and drain moisture from exhaust gases D . dampen exhaust gas pulsations in the manifold

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• Diesel engine jacket water is used in the distillation process as the （）.

  A . coolant for the distillate B . coolant for the brine cooler C . means of heating the feedwater D . primary means of producing a vacuum within the distiller

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• The cylinders, with cooling jackets, are （） to the engine frame by eight tie rods.

  A . screwed B . welded C . fastened D . rotated

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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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• In the closed cooling system, the water （）.

  A . is made to circulate out of the system B . is made to circulate within the system C . is made circulate within the system D . is made circulate out of the system

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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 may cause that excessively warm water leaves the condenser in a refrigeration plant? （） (1) too little cooling water (2) too much cooling water (3) too warm cooler water

  A . （1）only B . anyof（1），（2）and（3） C . anyof（1）and（3） D . anyof（1）and（2）

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• In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.

  A . a flash generator B . a flash evaporator C . a vacuum boiling evaporator D . a boiler

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• In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the liner

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ and Ⅱ

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• Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）

  A . increase blow-by in all cylinders B . incomplete combustion in all cylinder C . overloading in all cylinders D . insufficient fuel delivery to all cylinder

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• The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）

  A . Faulty thermostatic bypass valve B . Eroded zinc pencils in the heat exchanger C . Steam formation in the expansion tank D . Excessive leakage from jacket water pump seal

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• Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant？ (1) too little cooling water; (2) too much cooling water; (3) too warm cooler water.

  A.(1) only B.any of (1), (2) and (3) C.any of (1) and (3) D.any of (1) and (2)

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