單項選擇題Flexible hose under pressure in a hydraulic system will （）.

A.tend to twist about its long axis
B.expand in length and in diameter
C.contract in length and expand in diameter
D.flex at right angles to the applied pressure


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1.單項選擇題An air compressor can be unloaded at start-up by （）.

A.holding the discharge valve open
B.relieving the intercooler pressure to the atmosphere
C.using an enlarged, permanently opened clearance expansion space
D.a pre-charged accumulator

2.單項選擇題Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from （）.

A.within the space concerned
B.outside the space concerned
C.the throttle station
D.within the fire room

3.單項選擇題If an electric motor driven air compressor fails to start, it may be due to a （）.

A.leaking discharge valve
B.jammed suction valve
C.tripped overload relay
D.broken discharge un-loader

4.單項選擇題Which of the following precautions should always be carried out in dry dock?（）

A.Liquids should never be transferred between tanks without consulting the dock master
B.If sea valves have been disassembled, all bonnets must be checked for leakage when the ship is re-floated
C.Before re-floating, all sea chest strainers should be verified as having been replaced
D.All of the above

5.單項選擇題Which of the following statements about pump operations is NOT a correct statement?（）

A.In order for a fluid to be pumped, a fluid must be made to flow
B.A substance must be cold in order for it to be pumped
C.The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic system
D.A pump must receive its energy from an external source