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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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）