If a centrifugal pump vibrates and is noisy when operating, the cause could be _____.
A.worn gland sealing shaft
B.worn wearing rings
C.a bent shaft
D.reversed pump coupling
第1题
A.periodic survey
B.statutory survey
C.additional survey
D.annual survey
第2题
A.ram relief valves bypass oil to stop rudder movement
B.six-way valve shifts to the neutral flow position
C.steering pump electric motor is de - energized by the transfer switch
D.follow-up gear takes the hydraulic pump off stroke
第3题
A.Degree of saturation
B.Saturation temperature
C.Superheated temperature
D.Degree of superheat
第4题
A.Oil leaking from tanks inside engine room
B.Engine room cleaning water
C.Water leaking from the separator sludge tank
D.Sewage
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