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單項選擇題

The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to （）.

A.increase speed
B.increase the size of the cardent assembly
C.reduce wearing ring clearances
D.change the pump to a "close coupled" arrangement

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單項選擇題

Which of the following forms of energy is demonstrated through the process of combustion?（）

A.Chemical energy
B.Mechanical energy
C.Thermal energy
D.Electrical energy

單項選擇題

While inspecting the steering system at sea, you should check for （）.

A.air bubbles in the sight glass
B.any leaks in the system
C.over-travel in the rudder angle indicator
D.lost motion in the rams

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