單項(xiàng)選擇題During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）

A.Flywheel inertia
B.Admission of starting air
C.The way of the vessel
D.securing of fuel to the cylinders


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1.單項(xiàng)選擇題Cold weather starting of a diesel engine may be made easier by（）

A.decreasing the compression ratio
B.using a special fuel having a high ignition temperature
C.increasing the starting air supply
D.heating the jacket water

2.單項(xiàng)選擇題Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）

A.increasing the quantity of starting air
B.increasing the lube oil pressure
C.heating the engine fuel supply
D.heating the engine coolant

3.單項(xiàng)選擇題The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）

A.Faulty thermostatic bypass valve
B.Eroded zinc pencils in the heat exchanger
C.Steam formation in the expansion tank
D.Excessive leakage from jacket water pump seal

4.單項(xiàng)選擇題Immediately after starting a diesel engine, normal raw water and jacket water pressure are indicatedHowever, the jacket water temperature continues to rise, if there is no change in the sea temperature, you should suspect（）

A.overloading in all cylinders
B.a jammed three-way thermostatic valve
C.chromate PH too low
D.a high level in the surge tank

5.單項(xiàng)選擇題Trunk-type diesel engine pistons are most effectively cooled by heat（）

A.conducted through the engine block
B.conducted to water cooled cylinder walls
C.conducted through the piston crown
D.loss to escaping exhaust gases