單項(xiàng)選擇題A spur gear pump should be operated with the discharge valves （）.

A.slightly opened
B.throttled
C.fully opened
D.halfway opened


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）

A.The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow
B.The pump packing gland overheats after short operating periods
C.The motor over-current protective device continually shuts the pump down
D.Pounding noises can be heard at the pump suction chest

5.單項(xiàng)選擇題Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.

A.diameter of the discharge piping, with all other factors remaining the same
B.diameter of the suction piping, with all other factors remaining the same
C.width of the impeller only
D.diameter of the impeller