单项选择题

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

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单项选择题

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

单项选择题

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
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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