In an auxiliary boiler steam and water system, the highest pressure will be in the （）.

相似题目

• If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.

  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

  查看最佳答案

• Failure of the burner flame in an auxiliary boiler would probably be a result of（）

  A . water in the fuel oil B . broken high tension leads C . incorrect electrode setting D . full fuel pressure at the nozzle

  查看最佳答案

• Excessive alkalinity of the water in an auxiliary boiler can cause （）.

  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

  查看最佳答案

• The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.

  A . hour B . day C . week D . month

  查看最佳答案

• Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）

  A . increased fuel consumption B . increased feed water consumption C . fuel pump failure D . combustion control system failure

  查看最佳答案

• Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）

  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

  查看最佳答案

• After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the （）.

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

  查看最佳答案

• When there is a flame failure in an automatically fired auxiliary boiler, the （）.

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

  查看最佳答案

• The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）

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

  查看最佳答案

• The water in an auxiliary boiler should be tested daily for （）.

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

  查看最佳答案

• The water in an auxiliary boiler should be chemically tested daily for alkalinity and（）

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

  查看最佳答案

• The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.

  A . seawater contamination B . frequent surface blows C . dissolved oxygen deaeration D . frequent bottom blow

  查看最佳答案

• A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.

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

  查看最佳答案

• A smoking burner with a pulsating flame in auxiliary boiler, is an indication that the（）

  A . fuel oil supply temperature is normal B . burner electrode is incorrectly positioned C . fuel／air ratio is incorrect D . ignition current is too low

  查看最佳答案

• A firebox explosion in an automatically fired auxiliary boiler may be the result of （）

  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

  查看最佳答案

• Flame failure in an automatically fired auxiliary boiler can from a/an （）

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

  查看最佳答案

• Which action should be taken when an auxiliary boiler in is operation?（）

  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

  查看最佳答案

• The purpose of the safety relief valves installed on an auxiliary boiler is to （）.

  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

  查看最佳答案

• In the event of a flame failure in an auxiliary water-tube boiler, you must（）

  A . relight the boiler immediately to prevent loss of steam pressure B . relight the fire off the brickwork as the bricks are cherry red C . purge the furnace of any combustible gases before attempting to relight the fire D . speed up the feed pump to prevent dry firing when the burner flame is reestablished

  查看最佳答案

• The water in an auxiliary boiler should be tested for chloride content to determine （）.

  A . total dissolved solids B . salt contamination C . water hardness D . chlorine contaminatio

  查看最佳答案

• Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.

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

  查看最佳答案

• After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the （）.

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

  查看最佳答案

• Excessive vibration of an automatically fired auxiliary boiler can be caused by （）

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

  查看最佳答案

• 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

  查看最佳答案