更多"（） should be tested and adjusted wh"的相关试题:
[单项选择]The safety valves should be tested and adjusted when the boiler survey is （）
A. completed
B. carried out
C. cleaned
D. steamed
[单项选择]The water in an auxiliary boiler should be tested daily for （）.
A. dissolved oxygen
B. chlorides
C. sludge
D. dissolved nitrogen
[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]When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?（）
A. cold fuel oil
B. low fuel oil pressure
C. low atomizing steam pressure
D. water in the fuel oil
[单项选择]The water level in the gauge glass when a boiler is operating is （） when the boiler is shut down.
A. lower than
B. higher than
C. below
D. equal to
[单项选择]When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.
A. swell
B. shrinkage
C. flash off
D. lack of water
[单项选择]When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.
A. lower than
B. higher than
C. as much as
D. the same as
[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]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]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]Generally, runaway means such situation when the speed main engine exceeds the rating speed by its （）
A. 10%
B. 15%
C. 20%
D. 5%
[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]You are about to cross a narrow channel when you see an approaching vessel that can only be navigated safely within the channel.You should（）.
A. cross the channel as you are the stand-on vessel
B. cross only if the vessel in the channel is approaching on your port side
C. not cross the channel if you might impede the other vessel
D. sound the danger signal
[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]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
