单项选择题

Heavy soot accumulations in an auxiliary boiler could be caused by（）

A.water in the fuel oil
B.excessive cycling
C.high fuel oil pressure
D.improper burner maintenance

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单项选择题

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

单项选择题

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

单项选择题

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