更多"Heavy soot accumulations in an auxi"的相关试题:
[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]Soot blowers should be used in proper sequence so that（）
A. excess stresses will not be set up in the boiler
B. the decks will not be covered with soot
C. the soot will be swept toward the uptakes
D. there will not be a loss of steam pressure
[单项选择]The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.
A. be increased
B. be decreased
C. remain constant
D. either be increased or remain constant
[单项选择]（） will be used to blow away soot and the combustion products from the tube surfaces.
A. The blow down valve
B. The scum valve
C. The air release cock
D. Scot-blower
[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 dry-type exhaust muffler clogged with soot, will cause（）
A. low exhaust temperature
B. loss of engine power
C. burned intake valves
D. engine racing
[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]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]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]A dazzling white burner flame in the boiler furnace indicates （）.
A. proper combustion
B. water in the fuel
C. excess air
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 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]In an auxiliary boiler steam and water system, the highest pressure will be in the （）.
A. steam stop valve
B. dry pipe
C. feedwater system
D. generating tubes
[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]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
