更多"The water level in a steaming auxil"的相关试题:
[单项选择]The water level showing in a boiler water gauge glass is usually （） during working.
A. higher than the actual drum water level
B. equal to the actual drum water level
C. increasing due to steam condensation in the glass
D. lower than actual drum water level
[单项选择]The water level of an exhaust gas boiler which is independent of the auxiliary boiler and just as the extra heating surface of it （）
A. will be modulated in proportion
B. will be modulated in proportion and integral
C. will be modulated in proportion and differential
D. will not be modulated at all
[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 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 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]The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）
A. precipitate silica from solution
B. reduce corrosion in the heating coil
C. prevent clogging and erosion in the coil
D. maintain zero water hardness
[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 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]During the diesel engine running, the water level of FW expansion tank should normally kept in the （） level of glass tube.
A. the highest
B. above 3/4
C. 1/2-3/4
D. the lowest
[单项选择]If in doubt as to the true water level when a boiler is being oil-fired, you should （）.
A. take no measures
B. extinguish the fire as soon as possible
C. feed water to the boiler
D. open the blow down valve
[单项选择]The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
A. air gap
B. freeboard
C. penetration
D. water depth
[单项选择]If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）
A. loss of suction in the circulating pump
B. leak in the primary cooling system
C. broken raw water pump shaft
D. burned or cracked piston in one cylinder
[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]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]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]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
