單項(xiàng)選擇題If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）

A.inspection covers should not be opened until the engine has cooled
B.ventilation system should be continued in operation for one hour for cooling
C.scavenge pump should be immediately secured to prevent loss of lube oil
D.explosion covers should be opened slightly to provide extra ventilation


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1.單項(xiàng)選擇題The desirable properties of a marine fuel oil should include（）

A.high flash point and high viscosity
B.low flash point and high viscosity
C.low heating value and high sulphur content
D.high heating value and low sulphur content

2.單項(xiàng)選擇題If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?（）

A.Full power cannot be developed
B.The exhaust will contain black smoke
C.Complete combustion will be impossible
D.All of the above

3.單項(xiàng)選擇題If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）

A.immediately open all crankcase relief ports
B.increase crankcase exhauster speed to draw cool air into the engine
C.allow the engine to cool naturally
D.increase crank case scavenge air to remove unburned gases

4.單項(xiàng)選擇題Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）

A.The coolant temperature must be maintained at 180℃
B.The thermostatic bypass valves must be manually opened before the engine is started
C.The pressure cap must be removed while the engine is secured
D.Electrical power to the heater must be secured before the cooling system is drained

5.單項(xiàng)選擇題Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）

A.In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater
B.Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports
C.No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine
D.The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine