Steam Boiler Quiz

45 Questions | Total Attempts: 5337

SettingsSettingsSettings
Steam Boiler Quiz - Quiz

What is a steam boiler? What are the uses of a steam boiler? What does the steam boiler compose of and how does it work? These are some of the questions whose basics are being tested in this quiz. Enjoy.


Questions and Answers
  • 1. 
    Deaerator feedwater is to prevent
    • A. 

      Feed pump damage

    • B. 

      Corrosion in the boiler

    • C. 

      Lose of system vacuum

    • D. 

      All of the above

  • 2. 
    Steam line water hammer can best be prevented by
    • A. 

      Keeping line drained and insulated

    • B. 

      Replacing all 90 degree elbows with capped tees

    • C. 

      Always opening steam valves rapidly

    • D. 

      Keeping steam temperature below saturation point

  • 3. 
    The photoelectric cell installed as part of the combustion safety controls of an augomatically fired boiler will
    • A. 

      Sense light from the burner flame

    • B. 

      Control the modulating pressure control circuit

    • C. 

      Open the control circuit upon sensing an intense flame

    • D. 

      Close the control circuit upon sensing a flame failure

  • 4. 
    A scanner installed in modern combustion control system, functions to
    • A. 

      Cut off the fuel supply when the fire goes out

    • B. 

      Monitors the stack for soot fires

    • C. 

      Regulate the fuel oil supply pressure

    • D. 

      Sample the stack gases

  • 5. 
    If the low water level alarm sounds on an automatically fired boiler, and the low water cut out fails to function, you must immediately
    • A. 

      Blow down the gage glass to determine where the water level is

    • B. 

      Increase the feedwater supply to maintain the water level

    • C. 

      Start the emergency feedwater injector to restore normal water level

    • D. 

      Secure the fire to minimize damage to the boiler tubes

  • 6. 
    Combustion control systems on utomatic boilers are designed to prevent immediate burner ignition after a normal, or safety shutdown, in order to allow time for
    • A. 

      The furnace to be purged

    • B. 

      Electric charge buildup in the igniter

    • C. 

      The fuel pump to start

    • D. 

      The drum level to equalize

  • 7. 
    Dissolved oxygen can be removed from the boiler water by
    • A. 

      Frequent surface and bottom blow down

    • B. 

      Dumping and refilling the boiler weekly

    • C. 

      Passing the water through absorbent filters

    • D. 

      Treating the water with chemical scavengers

  • 8. 
    In addition to monitoring flame quality, flame scanners are used in combustion control systems to
    • A. 

      Regulate the air/fuel ratio controller for more efficient combustion

    • B. 

      Secure the forced draft fan upon flame failure

    • C. 

      Automatically opens the fuel oil solenoid valve

    • D. 

      Secure the fuel oil supply in the event of a flame failure

  • 9. 
    What are the two common gases that dissolved in boiler water and cause corrosion on the internal parts of the boiler?
    • A. 

      Oxygen and carbon dioxide

    • B. 

      Oxygen and carbon monoxide

    • C. 

      Oxygen and ammonia

    • D. 

      Oxygen and nitrogen

  • 10. 
    Treatment of boiler feedwater for the control of hardness is necessary to prevent
    • A. 

      Excessive feedwater alkalinity

    • B. 

      Foaming

    • C. 

      Carryover

    • D. 

      Waterside scale deposits

  • 11. 
    Incomplete combustion due to insufficient air yields an excess amount of
    • A. 

      Carbon dioxide

    • B. 

      Carbon monoxide

    • C. 

      Nitrogen oxide

    • D. 

      Sulfur dioxide

  • 12. 
    To minimize metal corrosion, boiler water is best kept
    • A. 

      Fairly acidic

    • B. 

      Slightly acidic

    • C. 

      Neutral

    • D. 

      Alkaline

  • 13. 
    Dissolved gases are removed from the boiler feedwater because they may cause
    • A. 

      Condenser vacuum loss

    • B. 

      Corrosive condition in the boiler

    • C. 

      False boiler water level

    • D. 

      Vapor lock in the feed pumps

  • 14. 
    The steam drum air vent is normally opened when cooling down a boiler to
    • A. 

      Relieve any residual air pressure in the drum

    • B. 

      Prevent a vacuum from forming in the steam drum

    • C. 

      Reduce the pressure in the steam drum more rapidly

    • D. 

      Protect the superheater

  • 15. 
    Low stack gas temperature should be avoided in order to reduce the
    • A. 

      Percentage of carbon monoxide in the stack gas

    • B. 

      Formation of sulfuric acid

    • C. 

      Heat loss to the uptake

    • D. 

      Accumulation of soot

  • 16. 
    The end product of reactions occurring when boiler water is chemically treated, remain in the boiler and increase the need for
    • A. 

      Makeup feed

    • B. 

      Acid cleaning

    • C. 

      Boiler blow down

    • D. 

      Waterside corrosion treatment

  • 17. 
    While raising steam on a cold boiler, the air vent is to be closed after
    • A. 

      The boiler is cut in on the line

    • B. 

      Steam has formed and all air is vented

    • C. 

      The economizer drain is closed

    • D. 

      All burners have been lit and firing normally

  • 18. 
    What is the purpose of chemically treating boiler water?
    • A. 

      To reduce the formation of scale on the waterside of the boiler

    • B. 

      To reduce to a minimum corrosion of the boiler metal

    • C. 

      Reduce foaming and moisture carryover

    • D. 

      All of the above

  • 19. 
    Phosphates are used in the chemical treatment of boiler water to
    • A. 

      Control alkalinity and control vanadium

    • B. 

      Convert scale forming salts to relatively harmless sludge

    • C. 

      Neutralize the effects of hydrogen embrittlement

    • D. 

      Decrease dissolved oxygen content

  • 20. 
    High carbon monoxide content in the flue gas of a boiler indicates
    • A. 

      Complete combustion

    • B. 

      Too much excess air

    • C. 

      Incomplete combustion

    • D. 

      A high carbon content fuel

  • 21. 
    A boiler safety valve must be capable of
    • A. 

      Remaining open until excess pressure in the steam drum is relieved

    • B. 

      Remaining open until a preset pressure drop occurs

    • C. 

      Opening graudally above designated pressure

    • D. 

      Closing with a chattering motion to free scale deposits from the seats

  • 22. 
    Oil accumulation in boiler water would
    • A. 

      Cause foaming and carryover from the boiler

    • B. 

      Increase the heat transfer rate

    • C. 

      Prevent acid attack on the boiler tubes

    • D. 

      Practically eliminate boiler sludge formation

  • 23. 
    Foaming in the boiler water is a result of
    • A. 

      Carryover

    • B. 

      Excessive suspended solids

    • C. 

      Low water level

    • D. 

      Excessive surface blows

  • 24. 
    Highly alkaline boiler water will contribute to the possible problem of
    • A. 

      Caustic embrittlement

    • B. 

      Scale formation

    • C. 

      Calcium carbonate precipitation

    • D. 

      Sodium sulfite reacting with dissolved oxygen

  • 25. 
    An explosion or flareback could occur in teh boiler if
    • A. 

      Too much excess air is supplied for convention

    • B. 

      The boiler firing rate exceeded the end point of circulation

    • C. 

      The fuel being burned is heated to the flash point

    • D. 

      The fire box is not purged before attempting to light a fire

Back to Top Back to top