单选题Too much air in the furnace of an oil-fired boiler would be indicated by （）.A yellowish flameB golden yellow flameC white flameD brilliant white flame

题目
单选题
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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更多“Too much air in the furnace of an oil-fired boiler would be”相关问题

  • 第1题：

    In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside.

    A.water-tube

    B.fire-tube

    C.exhaust gas

    D.composite


    答案：B

  • 第2题：

    In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.

    A.water-tube

    B.fire-tube

    C.exhaust gas

    D.Composite


    正确答案：B

  • 第3题：

    If the teacher were talking too much in class the students would not be learning.（）

    A对

    B错


    错
    略

  • 第4题：

    If the teacher were talking too much in class the students would not be learning.（）


    正确答案:错误

  • 第5题：

    单选题
    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


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    It would be unwise to ____ too much importance to these opinion polls.
    A

    stick

    B

    pay

    C

    apply

    D

    attach


    正确答案： C
    解析：

  • 第7题：

    单选题
    （）are supplied by main switchboard directly.
    A

    Suez Canal searchlight, air compressor and air conditioning compressor

    B

    Air compressor, boiler blower and refrigeration plant

    C

    Boiler blower, Suez Canal searchlight and refrigeration plant

    D

    Suez canal searchlight, air compressor and boiler blower


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    A dazzling white burner flame in the boiler furnace indicates （）.
    A

    proper combustion

    B

    water in the fuel

    C

    excess air

    D

    cold fuel oil


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    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


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    If in doubt as to the true water level when a boiler is being oil-fired, you should （）.
    A

    take no measures

    B

    extinguish the fire as soon as possible

    C

    feed water to the boiler

    D

    open the blow down valve


    正确答案： C
    解析： 暂无解析

  • 第11题：

    判断题
    If the teacher were talking too much in class the students would not be learning.（）
    A

    对

    B

    错


    正确答案： 对
    解析： 暂无解析

  • 第12题：

    单选题
    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


    正确答案： C
    解析： 暂无解析

  • 第13题：

    10． The beef is __________dear． Let-s not buy ．

    A． much too ,too much

    B． much too ,much too

    C． too much ,too much

    D． too much ,much too


    正确答案：A

  • 第14题：

    Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.

    The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.

    The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time. Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?

    A.air compressor

    B.air cooler

    C.air-conditioning plant

    D.mechanical ventilation plant


    正确答案：D

  • 第15题：

    How would you like to mail it?（）

    AThank you very much.

    BPost office is over there.

    CI'll be coming.

    DBy air mail, please.


    D
    略

  • 第16题：

    单选题
    Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.
    A

    possible

    B

    necessary

    C

    practicable

    D

    impracticable


    正确答案： C
    解析： 暂无解析

  • 第17题：

    单选题
    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


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    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


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    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


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.
    A

    water-tube

    B

    fire-tube

    C

    exhaust gas

    D

    None of the above is true


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.
    A

    not good

    B

    good

    C

    better

    D

    the best


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    One of the main purposes of refractories in a boiler furnace is to（）
    A

    help preheat the air for the furnaces

    B

    help preheat the feedwater

    C

    protect economizer from excessive heat

    D

    prevent excessive furnace heat losses


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    As for a oil-fired boiler too much air would indicated by （）.
    A

    yellowish flame

    B

    golden yellow flame

    C

    milky flame

    D

    brilliant white flame


    正确答案： C
    解析： 暂无解析

  • 第24题：

    单选题
    A dazzling white burner flame in the boiler furnace indicates （）.
    A

    no combustion

    B

    deposits in the fuel

    C

    excessive air in the fuel

    D

    cold fuel oil


    正确答案： D
    解析： 暂无解析

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