更多"A dazzling white burner flame in th"的相关试题:
[单项选择]A dazzling white burner flame in the boiler furnace indicates （）.
A. no combustion
B. deposits in the fuel
C. excessive air in the fuel
D. cold fuel oil
[单项选择]Failure of the burner flame in an auxiliary boiler would probably be a result of（）
A. water in the fuel oil
B. broken high tension leads
C. incorrect electrode setting
D. full fuel pressure at the nozzle
[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]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]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]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]The water level in a steaming auxiliary boiler will always （）
A. rise when the steam pressure is increased
B. remain constant as long as the feed pump operates
C. fall when the steam pressure is decreased
D. vary as the steam demand changes
[单项选择]Proper combustion in a boiler would be indicated by （）.
A. yellowish flame
B. golden yellow flame
C. white flame
D. brilliant white flame
[单项选择]Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.
A. 10
B. 7
C. 4
D. 1
[单项选择]The water in an auxiliary boiler should be chemically tested daily for alkalinity and（）
A. soap hardness
B. nitrog encontent
C. chloride content
D. dissolved CO2
[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]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
[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 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]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]Which one is not the normal operation for boiler shutdown?（）
A. Carry out soot blowing if permissible
B. Change fuel supply to diesel oil
C. Close steam stop valves on boiler when pressure is reduced
D. Drain boiler empty when it has cooled down
[单项选择]A flame screen（）.
A. permits the passage of vapor but not of flame
B. prevents the passage of flammable vapors
C. prevents inert gas from leaving a tank
D. permits vapors to exit but not enter a tank
