單項(xiàng)選擇題In the navigation, cause the shafting over load most easily（）

A.stopping the main engine suddenly
B.changing the main engine running direction suddenly
C.the sailing from the shallow water area to the deep water area
D.the ship’s trim too much


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）

A.Ignition lag increases
B.Lube oil system pressure increases
C.Brake specific fuel consumption increased
D.Mechanical efficiency increaded