單項選擇題Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.

A.the power stroke
B.the compression stroke
C.low load operation only
D.periods of standby


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2.單項選擇題In a closed diesel engine 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

3.單項選擇題Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.

A.operated manually once an hour
B.operated until the engine has started
C.placed into operation only at maximum load
D.adjustable to meet lubrication requirements

4.單項選擇題Bottom blow valves are installed on auxiliary water-tube boilers to （）

A.remove suspended and precipitated solids from the boiler water
B.completely drain the boiler in an emergency situation
C.prevent hardened scale deposits in the water drum
D.remove floating impurities from the oily water surface

5.單項選擇題A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.

A.around the engine
B.around the cooler
C.to the expansion tank
D.overboard