更多"A water pump can not supply water a"的相关试题:
[单项选择]A centrifugal pump can’t supply water after startingYou should check （）.
A. priming water
B. power supply
C. packing gland
D. bearing lubrication
[单项选择]The reciprocating pump can’t draw water from a tank may be caused by （）.
A. leaky pipe
B. opened inlet valve
C. too much water in tank
D. None of the above
[单项选择]A multistage centrifugal pump can be BEST described as having （）.
A. two or more impellers housed together in one casing and mounted on a single shaft
B. a single stepped impeller mounted in a progressively staged casing
C. a large radial clearance between the impeller and casing to prevent overheating due to
D. an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
[单项选择]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
[单项选择]Shaft sealing in a centrifugal pump can be effected by （）.
A. the mechanical seal
B. packed stuffing boxes
C. either A or B
D. neither A nor B
[单项选择]The amount of fluid delivered by a screw pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the rotor
C. either A or B
D. None of the above is tree
[单项选择]To keep injured survivors warm in the water after abandoning a ship，they should（）.
A. be placed in the middle of a small circle formed by the other survivors in the water
B. float on their backs with their arms extended for maximum exposure to the air
C. remove their life preservers and hold on to the uninjured survivors
D. sip seawater at intervals of fifteen minutes
[单项选择]When the dock is refilled with water after docking repair, the first work which should be done by engineers is （）
A. igniting boiler
B. releasing air in sea water system
C. starting generator
D. cut off shore power
[单项选择]The amount of fluid delivered by a gear pump can be regulated by （）.
A. throttling the pressure line
B. changing the speed of the rotor
C. either A or B
D. None of the above is true
[单项选择]The pressure of a liquid leaving the pump can be referred to as the （）.
A. total head
B. discharge head
C. net positive suction head
D. suction head
[单项选择]You may find the time of slack water after low water in a certain port from（）.
A. Deadweight Scale
B. Tide Tables
C. Notices to Mariners
D. Table of Azimuth
[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
[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]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]High diesel engine cooling water temperatures can be caused by （）.
A. a worn water pump
B. not enough coolant
C. air in the cooling system
D. all of the above
