更多"The pressure of a liquid leaving th"的相关试题:
[单项选择]Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.
A. filled
B. evacuated
C. compressed
D. charged
[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]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]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]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 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]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]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]If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
A. capacity will increase
B. capacity will decrease
C. suction pressure will increase
D. suction pressure will decrease
[单项选择]Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.
A. positive displacement
B. ejector
C. centrifugal
D. air compressor
[单项选择]In a four-cycle diesel engine piston blow-by can result in increased（）
A. crankcase pressure
B. compression pressure
C. scavenge pressure
D. exhaust manifold pressure
[单项选择]Which pump is the self-priming pump?（）
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[单项选择]According to the basic concept of GMDSS,（）can be rapidly alerted to a distress incident.
A. only SAR authorities on land
B. all ships in a very large sea area
C. the nearest coast stations and port radios
D. the SAR authorities ashore as well as ships in the vicinity of the casualty
[单项选择]What type of liquid is used in the liquid P/V breaker（）.
A. Hydraulic oil
B. Water-antifreeze mixture
C. Distilled water
D. Oil from the cargo
[单项选择]The （）pump is usually used as the bilge feed pump to an oily water separator.
A. turbine
B. screw
C. vane
D. ejector
[单项选择]A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.
A. injector
B. positive displacement
C. centrifugal
D. centripetal
[单项选择]A mixed-flow pump is a （） pump classified by the working principle.
A. self priming
B. positive displacement
C. reciprocating
D. impeller
