更多"The brickwork surrounding the fireb"的相关试题:
[单项选择]A firebox explosion in an automatically fired auxiliary boiler may be the result of （）
A. excessive purging before lighting off
B. insufficient trail for ignition period
C. a faulty transformer in the ignition circuit
D. insufficient purging before lighting off
[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]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]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]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
[单项选择]Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.
A. carry off
B. carry down
C. carry on
D. carry over
[单项选择]Impurities from the boiler water surface can be removed through the （）.
A. safety valve
B. blow down valve
C. scum valve
D. feed check valve
[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]Black smoke coming from a boiler can be caused by （）.
A. low water level
B. high water level
C. excessively high fuel pressure
D. low oil temperature
[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]The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.
A. acid
B. alkali
C. salt
D. None of the above
[单项选择]A SECONDARY function of a waste heat boiler is to （）.
A. reduce engine exhaust noise
B. reduce engine back pressure
C. increase engine cycle efficiency
D. increase turbocharger efficiency
[单项选择]If an operating auxiliary boiler has a water pH reading of 7, you should （）.
A. bottom blow the boiler
B. treat the water with caustic soda
C. treat the water with chemical scavengers
D. reduce the water alkalinity to recommended readings
[单项选择]When steam is being raised on a boiler, the water level will normally （）.
A. drop as the boiler warms up
B. rise as the boiler warms up
C. remain unchanged until the boiler is hot enough
D. rise and fall with the steam demand
[单项选择]In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）
A. The safety valve escape piping should be disconnected from the valve body and a blank inserted
B. The boiler vent valves should be opened
C. All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks
D. All of the above
[单项选择]In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.
A. water-tube
B. fire-tube
C. exhaust gas
D. none of the above
[单项选择]The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.
A. ensure feed water flow into the boiler
B. keep the steam drum pressure high
C. prevent water hammer in the feed line
D. help the feed water flash to steam
