Auxiliary boilers are divided into several classifications, one of which is（）

A . high steam pressure in the boiler B . abnormally high feed water temperature C . abnormally high boiler water temperature D . steam demand exceeding feed pump capacity

A . caustic embrittlement of the boiler metal B . acidic corrosion of the boiler metal C . hard scale deposits on the boiler tubes D . etching of the heat exchange surface

A . rise when the steam pressure is increased B . remain constant as long as the feed pump operates C . fall when the steam pressure is decreased D . vary as the steam demand change

A . a burned out solenoid in the oil supply valve B . high temperature excess air C . incorrectly setting the hot-well dump valve D . an incorrectly positioned burner snubber realy

A . furnace to be re-purged B . electric charge to buildup in the igniter C . fuel pump to restart D . dram level to stabilize

A . air supply is shut off B . fuel supply is shut off C . water supply is shut off D . safety valve lift

A . salinity is abnormally high B . steam demand is too high C . water level is abnormally low D . feedwater flow is low

A . dissolved oxygen B . chlorides C . sludge D . dissolved nitroge

A . soap hardness B . nitrog encontent C . chloride content D . dissolved CO

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

A . monkey B . donkey C . waste heat D . mai

A . completely drain the boiler in an emergency B . prevent sludge from forming in the drum C . remove floating impurities from the boiler water surface D . remove settled solids from the water drum

A . excessive purging before lighting off B . insufficient trail for ignition period C . a faulty transformer in the ignition circuit D . insufficient purging before lighting off

A . incorrect electrode setting B . incorrect nozzle position C . clogged fuel nozzle D . broken high tension lead

A . check and regulate the water level B . close the air cock once fires are lit C . blowdown the gage glass D . crack the steam stop to assure protective steam flow

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 leak

A . relieve excess fuel oil pressure during the “off” fire cycle B . admit water to the dry pipe C . throttle the forced draft fan output for proper combustion D . reduce excess steam pressure in the boiler

A . check and regulate the water level B . close the air cock once fires are lit C . blowdown the gage glass D . crack the steam stop to assure protective steam flow

A . fuel pump failure B . fan motor failure C . increased feedwater consumption D . decreased boiler efficiency

A . treating with oxygen scavengers B . securing the boiler and giving it a blowing down C . increasing the pH D . reducing the phosphate level

A . furnace to be re-purged B . electric charge to buildup in the igniter C . fuel pump to restart D . drum level to stabilize

A . water-tube natural circulation boilers B . fire-tube boilers C . water-tube forced circulation boilers D . all of the above

A . air or water in the furnace B . combustion pulses C . fuel oil pump failure D . flame failure

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