單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.

A.one size smaller than the pump suction nozzle
B.the same size as the pump suction nozzle
C.one size larger than the pump suction nozzle
D.installed with a short radius elbow at the pump