單項選擇題Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.

A.cooling water pump
B.nozzle cooling passages
C.cylinder jackets
D.heat exchanger


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1.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

3.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

4.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

5.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