更多"Before liquid can flow into a pump,"的相关试题:
[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
[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]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]A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.
A. mechanical energy to kinetic energy to potential energy
B. mechanical energy to potential energy to kinetic energy
C. potential energy to mechanical energy to kinetic energy
D. kinetic energy to mechanical energy to potential energy
[单项选择]A centrifugal pump attempting to develop flow against a closed discharge valve has a/an （）.
A. capacity of 0%
B. efficiency of 100%
C. internal slippage of 0%
D. shut off horsepower rating of 100%
[单项选择]Pump up the starting air reservoirs to their maximum pressure and （）the air reservoirs and air system.
A. open
B. close
C. drain
D. vent
[单项选择]The discharge flow of a reciprocating pump is （）.
A. steady
B. in pulsation
C. continuous
D. large
[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]Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A. exhaust gas pressure
B. exhaust gas temperature
C. speed
D. load
[单项选择]Usually we take the cooling effect of the air flown through the cylinder during the overlap period as（）
A. inevitable
B. harmful
C. helpful
D. unacceptable
[单项选择]The oil pressure and flow from each bearings can be checked when（）
A. the lubricating pumps are stopped and the access doors are opened
B. the lubricating pumps are running and the access doors are opened
C. the engine is running and the access doors are closed
D. the engine is stopped and the access doors are closed
[单项选择]Hot air can hold（）.
A. less moisture than cold air
B. more moisture than cold air
C. the same amount of moisture as cold air
D. moisture independent of air temperature
