In a bypass type lubrication system for a diesel engine, the

In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .

A.all of the oil used by the engine through a filter

B.some of the oil used by the engine through a filter

C.some of the oil used by the engine through a centrifuge

D.all of the oil used by the engine through a centrifuge

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 walls

Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.

A.The direction of pressure on the journal in four-stroke engine is continuously

B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine

C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines

D.Low-stroke engines usually consume less lube oil than four-stroke engines

A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.

A.corrosion at low engine loads

B.erosion at high engine loads

C.overload at high engine loads

D.scaling at all exhaust temperatures

In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.

A.suction pressure regulator

B.thermostatic bypass valve

C.sea water temperature

D.water level in the expansion tank