單項選擇題

The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）

A.cool the furnace to prevent pre-ignition
B.remove explosive vapors from the furnace
C.evaporate accumulated unburned fuel oil
D.provide sufficient air in the furnace to allow ignition of the fuel

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單項選擇題

The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）

A.precipitate silica from solution
B.reduce corrosion in the heating coil
C.prevent clogging and erosion in the coil
D.maintain zero water hardness

單項選擇題

Diesel engine waste heat boiler construction is usually of the fire-tube or（）

A.cyclone furnace boiler type
B.dry back boiler type
C.water-tube type
D.critical circulation boiler type