單項(xiàng)選擇題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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題Auxiliary boilers are divided into several classifications, one of which is（）

A.fire-tube controlled circulation
B.fire-tube supercritical circulation
C.water-tube natural circulation
D.water-tube express circulation

5.單項(xiàng)選擇題Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）

A.Natural convection only
B.Forced convection only
C.Both natural convection and forced convection
D.None