boiler water level is low
feedwater is too hot
boiler steam demand is low
feedwater is too cold
第1题：
辅助给水系统/应急给水系统 auxiliary feed water system/emergency feed water system
第2题：
in the event of a flame failure
in the event of a stack fire
when the water level reach the crown sheet
when the feed pump discharge pressure drops to a preset minimum
第3题：
A.salinity is abnormally
B.high steam demand is too
C.feed-water flow is low
D.water level is abnormally low
第4题：
feed pump suction line
hot well
shell of the feed heater
feed lines to the boiler
第5题：
relight the boiler immediately to prevent loss of steam pressure
relight the fire off the brickwork as the bricks are cherry red
purge the furnace of any combustible gases before attempting to relight the fire
speed up the feed pump to prevent dry firing when the burner flame is reestablished
第6题：
concentrations of calcium sulfate in the boiler water
fuel oil in the feed water
improper treatment of the feed water with calcium sulfate
excessive feed water alkalinity
第7题：
have a greater head capacity
operate with increased impeller efficiency
discharge through the suction side of the pump casing
require more power to run the shaft
第8题：
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.
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
第9题：
fuel pump failure
fan motor failure
increased feedwater consumption
decreased boiler efficiency
第10题：
centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump
centerline of the pump and the suction liquid level when the source of liquid is above the pump
centerline of the pump and the level of the discharge liquid
liquid levels of the suction and discharge