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單項(xiàng)選擇題

Prior to lighting off a cold automatically fired auxiliary boiler, yon should （）.

A.check and regulate the water level
B.close the air cock once fires are lit
C.blowdown the gage glass
D.crack the steam stop to assure protective steam flow

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單項(xiàng)選擇題

After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.

A.furnace to be re-purged
B.electric charge to buildup in the igniter
C.fuel pump to restart
D.drum level to stabilize

單項(xiàng)選擇題

（） will be used to blow away soot and the combustion products from the tube surfaces.

A.The blow down valve
B.The scum valve
C.The air release cock
D.Scot-blower

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