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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

A dazzling white burner flame in the boiler furnace indicates （）.

A.no combustion
B.deposits in the fuel
C.excessive air in the fuel
D.cold fuel oil

單項(xiàng)選擇題

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