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

A . 60 to75 B . 80 to 95 C . 100 to 115 D . 120 to 135

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

A . slightly acidic condition B . slightly alkaline condition C . overtreatment of water D . neutral condition of water

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

A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . Neither (1) or (2) are correct

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

A . heat conduction into the injected fuel oil B . heat conduction into the water jacket wall C . water circulation through passages in the holder D . fuel oil circulation through passages in the holder

A . low compression pressure B . increased piston wear C . increased cylinder lube oil consumption D . poor contact between compression rings and liner

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

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

A . slight acidity B . slight alkalinity C . excessive alkalinity D . excessive acidity

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

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

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

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

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

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

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

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

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

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

A . Ⅰ+Ⅱ B . Ⅱ+Ⅲ C . Ⅲ+Ⅳ D . Ⅰ+Ⅳ

A . higher torque but lower brake horsepower B . lower torque but higher brake horsepower C . higher torque and lower brake horsepower D . lower torque and higher brake horsepower

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