A.Clean all electrical connections
B.Lift the relief valves by hand
C.Inspect and clean all solenoid valves
D.Inspect for oil and water leaks
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A.carbon deposits on the flame scanner
B.high fuel oil temperature
C.low fuel oil viscosity
D.high steam pressure
A.water in the fuel oil
B.excessive cycling
C.high fuel oil pressure
D.improper burner maintenance
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
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
A.cyclone furnace boiler type
B.dry back boiler type
C.water-tube type
D.critical circulation boiler type
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Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
Cold weather starting of a diesel engine may be made easier by（）
Using a file without a handle may result in （）
（） is not installed on the main switchboar.
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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）