the mechanical seal
packed stuffing boxes
either A or B
neither A nor B
第1题：
Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an( ).
A.overload on the pump motor
B.low fluid level in the reservoir
C.low fluid viscosity around the shaft seal
D.high oil level in the sump
第2题：
What is the function of wearing rings found on some centrifugal pumps ________．
A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the outlet side from the inlet side
D.Dampen the turbulent discharge flow
第3题：
Sealing in pump shaft is achieved by means of the ( ).
A.gasket
B.packing
C.o-ring
第4题：
the mechanical seal
packed stuffing boxes
either A or B
neither A nor B
第5题：
worn gland sealing shaft
worn wearing rings
a bent shaft
reversed pump coupling
第6题：
Which of the following is operated from the main engine room console on an automated vessel?
A.Fire pump and lube oil pump
B.Lube oil pump and distilling plant
C.Distilling plant and shaft alley door
D.Shaft alley door and fixed CO2 release
第7题：
What prevents water running along the shaft of a leaking centrifugal pump from entering the shaft bearing ________．
A.Shaft seal
B.Water flinger
C.Drain hole
D.Lantern ring
第8题：
Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.
A.suction
B.exhaust
C.pressure
D.discharge
第9题：
Single stage or multistage
High pressure or low pressure
Open or close coupled
Horizontal or vertical
第10题：
Absorb erosion of high velocity discharge stream
Seal pump shaft against entry of air
Isolate the discharge side from the suction side
Dampen the turbulent discharge flow