The donkey boiler may be given a bottom blow （）

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• The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.

  A . main stem stop valve B . auxiliary steam stop valve C . feed check or control valve D . blow down valve

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• 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

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• The internal part of boiler should be cleaned by yard if found （）.

  A . scaled B . worn C . deformed D . rested

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• A donkey boiler is （）.

  A、a big boiler B、an auxiliary boiler C、both A and B D、neither A nor B

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

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

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

  A . steam stop valve B . dry pipe C . feedwater system D . generating tube

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• （）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.

  A . An economizer B . An attemperator C . A water dram D . A down-comer tube

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• 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

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• Too much air in the furnace of an oil-fired boiler would be indicated by （）.

  A . yellowish flame B . golden yellow flame C . white flame D . brilliant white flame

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

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

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• 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

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• Impurities from the boiler water surface can be removed through the （）.

  A . safety valve B . blow down valve C . scum valve D . feed check valve

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• A distorted furnace in a fire-tube auxiliary boiler may be the result of （）

  A . firing for extended periods in the low fire mode B . overheating, due to waterside deposits C . varying the water level above the crown sheet D . carrying excessive alkalinity in the boiler water

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• 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

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• （） should be tested and adjusted when the boiler survey is carried out.

  A . The boiler oil tank B . The steam pipe C . The fire side D . The safety valve

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• Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）

  A . clean the flame scanner photocell window B . Inspect and clean all solenoid valves C . lift the safety valves by hand D . Inspect for oil or water leak

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• Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?（）

  A . Sodium hydroxide B . Sodium carbonate C . Sodium nitrate D . Sodium polyphosphate

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• 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

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• The furnace of an oil fired boiler should be （） before the operating burner is lit.

  A . filled with water B . purged C . cleared of air D . None of the above is true

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• 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 hardne

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• The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.

  A . operating the boiler at less than normal water level B . installing fins on the firesides of water-tubes C . increasing the amount of excess air to the burners D . treating the boiler water with chemical oxygen scavenger

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• May I come round in the morning? The answer may be（  ）.

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• May I come round in the morning? The answer may be（ ）.

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• In narrative, the experience or event may be in the past, may be what people usually do, or may be going on now.

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