单项选择题
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
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相关考题
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单项选择题
WHR stands for （）.
A.Water Head Register
B.Water Heater Re-circulating
C.Waste Heat Recovery
D.Waste Handle Reference -
单项选择题
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 -
单项选择题
As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure
A.（1）
B.（1）and（2）
C.（2）
D.neither（1）nor（2）
