更多"Proper combustion in a boiler would"的相关试题:
[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]As for a oil-fired boiler too much air would indicated by （）.
A. yellowish flame
B. golden yellow flame
C. milky flame
D. brilliant white flame
[单项选择]When an auxiliary boiler is panting and emitting black smoke, you should （）.
A. increase the fuel oil temperature
B. decrease the fuel oil temperature
C. decrease the fuel oil supply pressure
D. increase the air supply
[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 （） 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]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]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
[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]
Which of the following may hardness of the boiler water cause?（）
(1) scale formation
(2) tube failure
(3) corrosion
A. （1）and（2）
B. （1）and（3）
C. （2）and（3）
D. （1），（2）and（3）
[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]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]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
