问题：
[单选] Cooling the intake air supplied to a diesel engine will （）.
reduce mean effective pressure。decrease average compression pressure。decrease air charge density。increase power output。
问题：
[单选] The water in an auxiliary boiler should be tested for chloride content to determine （）.
total dissolved solids。salt contamination。water hardness。chlorine contaminatio。
问题：
[单选] The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.
seawater contamination。frequent surface blows。dissolved oxygen deaeration。frequent bottom blow。
问题：
[单选] A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.
around the engine。around the cooler。to the expansion tank。overboard。
问题：
[单选] Bottom blow valves are installed on auxiliary water-tube boilers to （）
remove suspended and precipitated solids from the boiler water。completely drain the boiler in an emergency situation。prevent hardened scale deposits in the water drum。remove floating impurities from the oily water surface。
问题：
[单选] Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
operated manually once an hour。operated until the engine has started。placed into operation only at maximum load。adjustable to meet lubrication requirement。
问题：
[单选] In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.
suction pressure regulator。thermostatic bypass valve。sea water temperature。water level in the expansion tank。
问题：
[单选] The speed of the camshaft in a two-stroke/cycle diesel engine, running at 950 RPM, is （）.
475 RPM。950 RPM。1900 RPM。2400 RPM。
问题：
[单选] Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.
the power stroke。the compression stroke。low load operation only。periods of standby。
问题：
[单选] Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
cooling water pump。nozzle cooling passages。cylinder jackets。heat exchanger。
