更多"A centrifugal pump may fail to deli"的相关试题:
[单项选择]A water pump can not supply water after startingIt may be caused by （）.
A. closed discharge valve
B. broken pipe line
C. worn shaft
D. both A and B
[单项选择]The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means （）.
A. starters
B. pressure switches
C. pressure
D. water
[简答题]GIS开关储能电机运行时间超过多少秒时会发“Hydraulic pump fail（液压泵故障）”信号？
[单项选择]Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.
A. a level controller
B. a temperature switch
C. a pressure switch
D. a floating ball
[单项选择]Because the flow rate of supply water pump is too large, oily water separator does not work wellWhich of the following is not the reason?（）
A. the monitoring equipment is out of order
B. separating effect becomes bad
C. inner wall is contaminated
D. separating effect becomes bad and inner wall is contaminated
[单项选择]The motor for the fresh water pump （）.
A. need to repair
B. need to be repaired
C. needs to repair
D. needs repairing
[单项选择]The pressure head of a water pump is given in the unit of （）.
A. kg
B. MPa
C. mH20
D. None of the above
[单项选择]Distilled water from an evaporator may be discharged into a potable water tank （）.
A. through a detachable hose connection
B. after passing through an activated charcoal filter
C. after chemical analysis shows it is fit for consumption
D. through a solenoid operated three-way valve
[单项选择]When may the automatic identification system (AIS) be switched off? （）
A. At anytime as long as it is properly logged
B. At the Master's professional judgment
C. Only when the vessel is at anchor or in port
D. Under no circumstance
[单项选择]A passenger vessel is underway. When may passengers visit the pilothouse? （）
A. Passengers are excluded from the pilothouse while underway
B. Passengers are permitted in the pilothouse during daylight hours only
C. Passengers are permitted to visit the pilothouse when authorized by the Master and officer of the watch
D. Passengers are permitted in the pilothouse when they are escorted by a ship's officer
[单项选择]For GMDSS，when may a compulsory vessel not be allowed to leave port?（）
A. When the vessel is in an overloaded condition
B. When the vessel has arranged for both duplication of equipment AND shore-based maintenance
C. When the vessel has replaced a required piece of GMDSS-related equipment but its performance has not been verified or logged
D. When the vessel is carrying only two licensed GMDSS Radio Operators and is capable of performing all required functions
[单项选择]On a ship，when may a work vest be substituted for a required life preserver?（）
A. To replace a damaged life preserver
B. For use during fire drills
C. For use during boat drills
D. At no time
[单项选择]On an OSV，when may a work vest be substituted for a required life jacket?（）
A. To replace a damaged life jacket
B. For use during fire drills
C. For use during boat drills
D. At no time
[单项选择]Excessively warm water leaving condenser may be caused by（）
A. fouled tubes in shell and tube condenser
B. too little or too warm condenser water
C. air or non-condensable gas in system
D. overcharge of refrigerant
[单项选择]When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A. to cut down the amount of cooling water needed
B. to prevent an excess amount of cooling water from being discharged to the bilges
C. to supply hot water to the evaporator for more economical operation
D. None of the above is tree
[单项选择]When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A. to decrease scale formation
B. for better cooling effect
C. for more economical purpose
D. to raise vacuum
[单项选择]In a domestic fresh water system, the pump starters are controlled by （） switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off.
A. water level
B. water flow
C. temperature
D. pressure
[单项选择]The most suitable pump for oily water separator feed duties is （）.
A. a reciprocating pump
B. a vane pump
C. a centrifugal pump
D. a triple screw pump
