单项选择题

The oil index of main engine should be controlled to prevent it from in heavy weather（）

A.over heat
B.over speed
C.over pressure
D.over worn

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单项选择题

A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）

A.increasing the linear velocity of the exhaust gases
B.changing directions of exhaust gas flow
C.decreasing the temperature of the exhaust gases
D.accelerating the exhaust gas through a reduced size orifice

单项选择题

When the ship is going to enter into the harbor,（）

A.change from heavy fuel oil to diesel oil for mail engine
B.pumping oil bilge water
C.change sea chest form high level one to lower one
D.test emergency generator

单项选择题

Which of the following represents the significance the fuel oil cetane number?（）

A.The cetane number has no affect on injection lag
B.The cetane number is an indication of the fuel’s viscosity
C.Ignition lag is reduced with fuels having a high cetane number
D.The cetane number is of little significance in the combustion