更多"The boiler feed pump discharge pres"的相关试题:
[单项选择]The pump discharge pressure will be considerably higher than the pressure at the （）.
A. pump entry branch
B. outlet pipe
C. impeller
D. None of the above is true
[单项选择]If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.
A. high steam pressure in the boiler
B. abnormally high feed water temperature
C. abnormally high boiler water temperature
D. steam demand exceeding feed pump capacity
[单项选择]A feed pump for an auxiliary boiler might lose suction if the （）.
A. boiler water level is low
B. feedwater is too hot
C. boiler steam demand is low
D. feedwater is too cold
[单项选择]To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.
A. shaft and impeller
B. motor and pump shaft
C. casing and impeller wearing rings
D. lantern ring and impeller
[单项选择]A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A. the four-way control valve failing to shift
B. the bleeder valve sticking in the open position
C. cold hydraulic fluid
D. a clogged air vent falter on the oil reservoir
[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]For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）
A. High oxygen concentration
B. Low pH
C. Proper alkalinity
D. All of the above
[单项选择]The boiler feed water check valves are located on the （）
A. feed pump suction line
B. hot well
C. shell of the feed heater
D. feed lines to the boiler
[单项选择]The feed water to the boiler will comprise （）.
A. condensate
B. a small amount of make-up feed
C. A and B
D. None of the above
[单项选择]A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.
A. monkey
B. donkey
C. waste heat
D. main
[单项选择]Which pump is the self-priming pump?（）
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[单项选择]A donkey boiler is （）.
A. one to supply steam to the main propulsion turbine
B. an auxiliary boiler
C. A and B
D. neither A nor B
[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
[单项选择]The brickwork surrounding the firebox of a boiler is known as（）.
A. refractory
B. the screen wall
C. the water wall
D. fire plate
[单项选择]Heavy soot accumulations in an auxiliary boiler could be caused by（）
A. water in the fuel oil
B. excessive cycling
C. high fuel oil pressure
D. improper burner maintenance
[单项选择]The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.
A. hour
B. day
C. week
D. month
[单项选择]Diesel engine waste heat boiler construction is usually of the fire-tube or（）
A. cyclone furnace boiler type
B. dry back boiler type
C. water-tube type
D. critical circulation boiler type
[单项选择]The water in an auxiliary boiler should be tested for chloride content to determine （）.
A. total dissolved solids
B. salt contamination
C. water hardness
D. chlorine contamination
