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


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1.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

3.單項(xiàng)選擇題A dazzling white burner flame in the boiler furnace indicates （）.

A.proper combustion
B.water in the fuel
C.excess air
D.cold fuel oil

4.單項(xiàng)選擇題In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）

A.The safety valve escape piping should be disconnected from the valve body and a blank inserted
B.The boiler vent valves should be opened
C.All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks
D.All of the above

5.單項(xiàng)選擇題（） should be tested and adjusted when the boiler survey is carried out.

A.The boiler oil tank
B.The steam pipe
C.The fire side
D.The safety valves