Steam Boiler Quiz

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  • 1/45 Questions

    The prcess of breaking up the fuel into fine particles is to ensure good combustion is called

    • Settling
    • Straining
    • Pumping
    • Atomization
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About This 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.

Steam Boiler Quiz - Quiz

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  • 2. 

    The purpose of a peep hole in the boiler casing is to

    • Examine condition of the flame

    • Check the operation of the soot blowers

    • Check for excess smoke in the stack

    • Examine the condition of the refractory cone

    Correct Answer
    A. Examine condition of the flame
    Explanation
    The purpose of a peep hole in the boiler casing is to examine the condition of the flame. This is important because the flame is a crucial element in the combustion process of the boiler. By being able to observe the flame through the peep hole, operators can ensure that it is burning efficiently and without any issues such as excessive smoke or improper combustion. This helps in maintaining the overall performance and safety of the boiler.

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  • 3. 

    Before an explosion can occur in the boiler furnace, there must be an accumulation of unburned fuel, sufficient air to form an explosive mixture, and a

    • Space large enough for explosion to occur

    • Ground in the burner ignition electrode

    • High steam demand on the boiler

    • Source of ignition for the explosive mixture

    Correct Answer
    A. Source of ignition for the explosive mixture
    Explanation
    The correct answer is "source of ignition for the explosive mixture". In order for an explosion to occur in the boiler furnace, all three conditions mentioned in the question must be met: an accumulation of unburned fuel, sufficient air to form an explosive mixture, and a source of ignition. Without a source of ignition, the explosive mixture will not ignite and therefore no explosion will occur. The other options listed (space large enough for explosion, ground in the burner ignition electrode, high steam demand on the boiler) are not directly related to the ignition of the explosive mixture.

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  • 4. 

    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

    • The furnace to be purged

    • Electric charge buildup in the igniter

    • The fuel pump to start

    • The drum level to equalize

    Correct Answer
    A. The furnace to be purged
    Explanation
    Automatic boilers have combustion control systems that are designed to prevent immediate burner ignition after a normal or safety shutdown. This is done in order to allow time for the furnace to be purged. Purging the furnace means removing any remaining gases or impurities from the combustion chamber before igniting the burner again. This is important for safety reasons as it helps to prevent any potential explosions or accidents that could occur if there are still combustible gases present in the furnace.

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  • 5. 

    Dissolved gases are removed from the boiler feedwater because they may cause

    • Condenser vacuum loss

    • Corrosive condition in the boiler

    • False boiler water level

    • Vapor lock in the feed pumps

    Correct Answer
    A. Corrosive condition in the boiler
    Explanation
    Dissolved gases in the boiler feedwater can cause a corrosive condition in the boiler. When these gases, such as oxygen and carbon dioxide, are present in the water, they can react with the metal surfaces of the boiler, leading to corrosion. This corrosion can weaken the boiler structure and cause leaks or other damage. Therefore, it is important to remove dissolved gases from the feedwater to prevent the formation of a corrosive environment in the boiler.

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  • 6. 

    What is the purpose of chemically treating boiler water?

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

    • To reduce to a minimum corrosion of the boiler metal

    • Reduce foaming and moisture carryover

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The purpose of chemically treating boiler water is to achieve multiple goals. Firstly, it aims to reduce the formation of scale on the waterside of the boiler, which can hinder heat transfer and decrease efficiency. Secondly, it aims to minimize corrosion of the boiler metal, as corrosion can lead to equipment failure and leaks. Lastly, chemical treatment helps to reduce foaming and moisture carryover, which can cause operational issues and damage downstream equipment. Therefore, the correct answer is "all of the above."

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  • 7. 

    High carbon monoxide content in the flue gas of a boiler indicates

    • Complete combustion

    • Too much excess air

    • Incomplete combustion

    • A high carbon content fuel

    Correct Answer
    A. Incomplete combustion
    Explanation
    High carbon monoxide content in the flue gas of a boiler indicates incomplete combustion. When fuel is not burned completely, it produces carbon monoxide instead of carbon dioxide. This can occur due to insufficient oxygen supply or improper mixing of fuel and air. Incomplete combustion is undesirable as it releases harmful pollutants into the atmosphere and reduces the overall efficiency of the combustion process.

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  • 8. 

    Oil accumulation in boiler water would

    • Cause foaming and carryover from the boiler

    • Increase the heat transfer rate

    • Prevent acid attack on the boiler tubes

    • Practically eliminate boiler sludge formation

    Correct Answer
    A. Cause foaming and carryover from the boiler
    Explanation
    Oil accumulation in boiler water can cause foaming and carryover from the boiler. Foaming occurs when the oil forms a layer on the water's surface, trapping steam bubbles and causing them to rise rapidly. This can lead to carryover, where the foaming water is carried over into the steam, resulting in contamination. Foaming and carryover can cause operational issues, such as reduced boiler efficiency, damage to downstream equipment, and increased maintenance requirements. Therefore, it is important to prevent oil accumulation in boiler water to avoid these problems.

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  • 9. 

    You should blow down a gauge glass periodically to

    • Remove any sediment from the glass

    • Maintain the proper level in the steam drum

    • Provide water sampler for the second assistant

    • Test the feedwater stop-check valve

    Correct Answer
    A. Remove any sediment from the glass
    Explanation
    Blowing down a gauge glass periodically helps to remove any sediment that may have accumulated on the glass. Sediment can obstruct the view and accuracy of the gauge glass, making it difficult to determine the water level in the steam drum. By removing the sediment, the gauge glass can provide a clear and accurate indication of the water level, ensuring the safe and efficient operation of the steam system.

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  • 10. 

    An explosion or flareback could occur in teh boiler if

    • Too much excess air is supplied for convention

    • The boiler firing rate exceeded the end point of circulation

    • The fuel being burned is heated to the flash point

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

    Correct Answer
    A. The fire box is not purged before attempting to light a fire
    Explanation
    If the fire box is not purged before attempting to light a fire in the boiler, it means that there may still be a buildup of flammable gases or fuel vapors present. When the fire is ignited, these gases can ignite and cause an explosion or flareback. Purging the fire box ensures that any potentially dangerous gases are removed before the fire is lit, reducing the risk of an explosion or flareback occurring.

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  • 11. 

    When a boiler water test indicates a pH value of 6, you should

    • Check the deaerator for possible malfunction

    • Begin a continuous boiler blow down

    • Chemically treat to lower the pH to normal level

    • Chemically treat to raise the pH to normal level

    Correct Answer
    A. Chemically treat to raise the pH to normal level
    Explanation
    A pH value of 6 in boiler water indicates that the water is acidic. Acidic water can cause corrosion and damage to the boiler system. To prevent this, the pH should be raised to a normal level. This can be achieved by chemically treating the water to neutralize the acidity and bring the pH back to a safe range.

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  • 12. 

    Which is a correct statement concerning heat transfer

    • Heat is always transferred at a constant rate

    • Heat transfer rate increase as temperature difference increases

    • The rate of heat transfer is not affected by temperature difference

    • The high temperature region is known as a heat sink

    Correct Answer
    A. Heat transfer rate increase as temperature difference increases
    Explanation
    The statement that heat transfer rate increases as temperature difference increases is correct. This is because the temperature difference between two objects determines the driving force for heat transfer. The greater the temperature difference, the greater the energy imbalance and the faster heat will flow from the higher temperature object to the lower temperature object. Therefore, the rate of heat transfer is directly proportional to the temperature difference.

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  • 13. 

    The flash point of the fuel oil should be used to determine the highest temperature to which the oil may be heated

    • For atomizing

    • For centrifuging

    • In a storage tank

    • In the recirculating line

    Correct Answer
    A. For atomizing
    Explanation
    The flash point of the fuel oil is the temperature at which it can ignite when exposed to an open flame or spark. When using the fuel oil for atomizing, it is important to determine the highest temperature to which the oil can be heated without reaching its flash point. This is because heating the oil beyond its flash point can lead to combustion and potentially cause a fire or explosion. Therefore, knowing the flash point helps ensure safe and efficient atomization of the fuel oil.

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  • 14. 

    Strainers are installed in boiler fuel oil service lines to

    • Absorb contaminants

    • Removes solids

    • Decrease vicosity

    • Absorb water

    Correct Answer
    A. Removes solids
    Explanation
    Strainers are installed in boiler fuel oil service lines to remove solids. This is important because solid particles can clog the fuel oil system, leading to reduced efficiency and potential damage to the boiler. By removing solids, the strainer helps to ensure a smooth flow of fuel oil, preventing blockages and maintaining the proper functioning of the boiler system.

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  • 15. 

    A scanner installed in modern combustion control system, functions to

    • Cut off the fuel supply when the fire goes out

    • Monitors the stack for soot fires

    • Regulate the fuel oil supply pressure

    • Sample the stack gases

    Correct Answer
    A. Cut off the fuel supply when the fire goes out
    Explanation
    The scanner installed in a modern combustion control system is responsible for detecting the presence of a fire. When the scanner senses that the fire has gone out, it triggers the system to cut off the fuel supply. This is done to prevent any potential hazards or accidents that may occur if fuel continues to be supplied without a fire present.

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  • 16. 

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

    • Makeup feed

    • Acid cleaning

    • Boiler blow down

    • Waterside corrosion treatment

    Correct Answer
    A. Boiler blow down
    Explanation
    When boiler water is chemically treated, reactions occur that produce by-products or impurities. These by-products and impurities can accumulate in the boiler over time, leading to various issues such as reduced efficiency and increased corrosion. To prevent these problems and maintain optimal boiler performance, regular removal of the accumulated by-products and impurities is necessary. This process is known as boiler blow down, where a portion of the boiler water is discharged to remove the contaminants. Therefore, the end product of reactions occurring during chemical treatment increases the need for boiler blow down.

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  • 17. 

    As the pH of the boiler water approaches zero, the wter becomes increasingly

    • Soft

    • Alkaline

    • Neutral

    • Acidic

    Correct Answer
    A. Acidic
    Explanation
    As the pH of the boiler water approaches zero, it indicates a high concentration of hydrogen ions in the water. This high concentration of hydrogen ions makes the water acidic. Therefore, the correct answer is acidic.

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  • 18. 

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

    • The boiler is cut in on the line

    • Steam has formed and all air is vented

    • The economizer drain is closed

    • All burners have been lit and firing normally

    Correct Answer
    A. Steam has formed and all air is vented
    Explanation
    The correct answer is "steam has formed and all air is vented." When raising steam on a cold boiler, it is important to ensure that all air is vented from the system before closing the air vent. This is because air in the boiler can cause inefficiencies and potentially damage the boiler. Once steam has formed and all air is vented, it indicates that the system is properly filled with steam and ready for operation, allowing the air vent to be closed.

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  • 19. 

    Failure to remove calcium and magnesium from the feedwater before it reaches the boiler can result in tube

    • Scaling

    • Pitting

    • Scudding

    • Erosion

    Correct Answer
    A. Scaling
    Explanation
    Failure to remove calcium and magnesium from the feedwater before it reaches the boiler can result in scaling. Scaling occurs when these minerals precipitate out of the water and form a hard, crusty layer on the inside of the boiler tubes. This layer reduces the efficiency of heat transfer and can eventually lead to overheating and failure of the tubes. Therefore, it is crucial to remove these minerals through water treatment processes to prevent scaling and maintain the proper functioning of the boiler.

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  • 20. 

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

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

    • Increase the feedwater supply to maintain the water level

    • Start the emergency feedwater injector to restore normal water level

    • Secure the fire to minimize damage to the boiler tubes

    Correct Answer
    A. Secure the fire to minimize damage to the boiler tubes
    Explanation
    If the low water level alarm sounds on an automatically fired boiler and the low water cut out fails to function, securing the fire is the correct action to take. By securing the fire, the fuel supply to the boiler is shut off, preventing further heat and pressure buildup. This helps to minimize damage to the boiler tubes, as continued firing without sufficient water can cause overheating and potentially lead to a catastrophic failure. It is important to secure the fire promptly to prevent any further damage or safety hazards.

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  • 21. 

    Steam line water hammer can best be prevented by

    • Keeping line drained and insulated

    • Replacing all 90 degree elbows with capped tees

    • Always opening steam valves rapidly

    • Keeping steam temperature below saturation point

    Correct Answer
    A. Keeping line drained and insulated
    Explanation
    Keeping the steam line drained and insulated is the best way to prevent steam line water hammer. Water hammer occurs when steam condenses rapidly, causing a sudden pressure increase and resulting in a loud banging noise. By keeping the line drained, any accumulated condensate is removed, reducing the chances of water hammer. Additionally, insulating the steam line helps to maintain a constant temperature, preventing rapid condensation and minimizing the risk of water hammer.

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  • 22. 

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

    • Oxygen and carbon dioxide

    • Oxygen and carbon monoxide

    • Oxygen and ammonia

    • Oxygen and nitrogen

    Correct Answer
    A. Oxygen and carbon dioxide
    Explanation
    Oxygen and carbon dioxide are the two common gases that dissolve in boiler water and cause corrosion on the internal parts of the boiler. Oxygen can lead to corrosion by reacting with the metal surfaces, while carbon dioxide can form carbonic acid when dissolved in water, which can also corrode the boiler. Therefore, the presence of these two gases in the boiler water can result in the deterioration of the internal parts of the boiler.

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  • 23. 

    Dissolved oxygen can be removed from the boiler water by

    • Frequent surface and bottom blow down

    • Dumping and refilling the boiler weekly

    • Passing the water through absorbent filters

    • Treating the water with chemical scavengers

    Correct Answer
    A. Treating the water with chemical scavengers
    Explanation
    Treating the water with chemical scavengers is the correct answer because chemical scavengers are substances that can react with dissolved oxygen and remove it from the boiler water. These scavengers can chemically react with the oxygen molecules, converting them into harmless compounds that do not pose a risk to the boiler system. This method is commonly used in boiler water treatment to prevent corrosion and damage caused by dissolved oxygen.

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  • 24. 

    The steam drum air vent is normally opened when cooling down a boiler to

    • Relieve any residual air pressure in the drum

    • Prevent a vacuum from forming in the steam drum

    • Reduce the pressure in the steam drum more rapidly

    • Protect the superheater

    Correct Answer
    A. Prevent a vacuum from forming in the steam drum
    Explanation
    When a boiler is being cooled down, the temperature of the steam and water inside the drum decreases, causing a decrease in pressure. If the air vent is not opened, this decrease in pressure can create a vacuum inside the steam drum. Opening the air vent allows air to enter the drum, preventing the formation of a vacuum. This is important because a vacuum can cause damage to the boiler and its components.

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  • 25. 

    Bunker "C" fuel oil is heated prior to atomization to

    • Increase the heating value

    • Increase its specific gravity

    • Reduce its viscosity

    • Reduce the flash point

    Correct Answer
    A. Reduce its viscosity
    Explanation
    Bunker "C" fuel oil is a heavy fuel oil with high viscosity. When it is heated prior to atomization, the heat causes the oil to become less viscous, meaning it flows more easily. This is important for efficient combustion in engines or burners, as reduced viscosity allows for better atomization and more complete combustion. Therefore, heating bunker "C" fuel oil reduces its viscosity, making it easier to handle and burn effectively.

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  • 26. 

    Treatment of boiler feedwater for the control of hardness is necessary to prevent

    • Excessive feedwater alkalinity

    • Foaming

    • Carryover

    • Waterside scale deposits

    Correct Answer
    A. Waterside scale deposits
    Explanation
    Treatment of boiler feedwater is necessary to prevent waterside scale deposits. When the feedwater contains high levels of hardness, minerals such as calcium and magnesium can precipitate out of the water and form scale deposits on the internal surfaces of the boiler. These scale deposits can reduce heat transfer efficiency, restrict water flow, and ultimately lead to boiler failure. Therefore, treating the feedwater to remove or control hardness is essential in order to prevent the formation of scale deposits and ensure the efficient and safe operation of the boiler.

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  • 27. 

    To minimize metal corrosion, boiler water is best kept

    • Fairly acidic

    • Slightly acidic

    • Neutral

    • Alkaline

    Correct Answer
    A. Alkaline
    Explanation
    To minimize metal corrosion, boiler water is best kept alkaline. This is because alkaline conditions help to neutralize any acidic substances present in the water, preventing them from corroding the metal surfaces of the boiler. Alkaline water also forms a protective layer on the metal, acting as a barrier against corrosion. Keeping the water alkaline helps to maintain the integrity and longevity of the boiler system.

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  • 28. 

    A boiler safety valve must be capable of

    • Remaining open until excess pressure in the steam drum is relieved

    • Remaining open until a preset pressure drop occurs

    • Opening graudally above designated pressure

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

    Correct Answer
    A. Remaining open until excess pressure in the steam drum is relieved
    Explanation
    A boiler safety valve must be capable of remaining open until excess pressure in the steam drum is relieved in order to prevent a catastrophic failure of the boiler. If the pressure in the steam drum exceeds safe levels, the safety valve opens to release the excess pressure and prevent any damage or explosion. This ensures the safety of the boiler and the surrounding equipment and personnel.

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  • 29. 

    Incomplete combustion due to insufficient air yields an excess amount of

    • Carbon dioxide

    • Carbon monoxide

    • Nitrogen oxide

    • Sulfur dioxide

    Correct Answer
    A. Carbon monoxide
    Explanation
    Incomplete combustion occurs when there is not enough oxygen present for the complete oxidation of a fuel. In this case, insufficient air results in the production of carbon monoxide (CO) instead of carbon dioxide (CO2). Carbon monoxide is a toxic gas that is colorless, odorless, and tasteless. It is produced when carbon-containing fuels, such as gasoline, coal, or wood, do not burn completely. Carbon monoxide can be harmful when inhaled, as it binds to hemoglobin in the blood, reducing its ability to transport oxygen. Therefore, the excess amount of carbon monoxide is the correct answer.

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  • 30. 

    The most corrosive substances in the boiler water are oxygen and

    • Hydrogen sulfide

    • Sulfur dioxide

    • Carbon dioxide

    • Ammonia

    Correct Answer
    A. Carbon dioxide
    Explanation
    Carbon dioxide is one of the most corrosive substances in boiler water. When carbon dioxide dissolves in water, it forms carbonic acid, which can corrode the metal surfaces of the boiler. This corrosion can lead to the deterioration of the boiler's structural integrity and reduce its efficiency. Therefore, it is important to control the levels of carbon dioxide in boiler water to prevent corrosion and maintain the proper functioning of the boiler system.

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  • 31. 

    Pumps normally used fuel oil service is

    • Positive displacement rotary pump

    • Two-stage centrifugal pumps

    • Explosion proof gear pumps

    • Non-vented plunger pumps

    Correct Answer
    A. Positive displacement rotary pump
    Explanation
    A positive displacement rotary pump is the most suitable choice for fuel oil service because it is designed to handle viscous fluids like fuel oil. This type of pump operates by trapping fluid between rotating components and the pump casing, creating a continuous flow. It is capable of delivering a consistent and steady flow rate, which is important for fuel oil applications. Additionally, positive displacement rotary pumps are known for their durability and ability to handle high pressures, making them suitable for the demanding conditions often found in fuel oil service.

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  • 32. 

    The presence of sulfur in the fuel oil will most likely cause

    • A decrease in the ability of the oil to be properly atomized

    • Excessive heat content per unit volume

    • Heavy slag formation in the refractory

    • Corrosion in the fireside of the boiler

    Correct Answer
    A. Corrosion in the fireside of the boiler
    Explanation
    The presence of sulfur in the fuel oil can lead to corrosion in the fireside of the boiler. Sulfur, when burned, forms sulfur dioxide (SO2) which can combine with moisture in the flue gas to form sulfuric acid (H2SO4). This acid can then condense on the fireside surfaces of the boiler, leading to corrosion. Corrosion can weaken the boiler structure and cause leaks, reducing the efficiency and lifespan of the boiler.

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  • 33. 

    In addition to monitoring flame quality, flame scanners are used in combustion control systems to

    • Regulate the air/fuel ratio controller for more efficient combustion

    • Secure the forced draft fan upon flame failure

    • Automatically opens the fuel oil solenoid valve

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

    Correct Answer
    A. Secure the fuel oil supply in the event of a flame failure
    Explanation
    Flame scanners are used in combustion control systems to secure the fuel oil supply in the event of a flame failure. This means that if the flame scanner detects that the flame has gone out, it will take measures to ensure that the fuel oil supply is shut off to prevent any potential hazards or accidents. This is an important safety feature as it helps to prevent the accumulation of fuel oil in the system and reduces the risk of fire or explosions.

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  • 34. 

    The concentrtion of total dissolve solids in the water in a boiler could increase as a result of

    • Infrequent bottom blows

    • Zero water hardness

    • Dissolved oxygen

    • Priming and carryover

    Correct Answer
    A. Infrequent bottom blows
    Explanation
    Infrequent bottom blows refers to the process of removing accumulated solids from the bottom of a boiler. If bottom blows are infrequent, these solids can build up and increase the concentration of total dissolved solids in the water. This can lead to various issues such as reduced boiler efficiency, corrosion, and scaling. Therefore, infrequent bottom blows can be a possible cause for the increase in total dissolved solids concentration in the water in a boiler.

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  • 35. 

    Phosphates are used in the chemical treatment of boiler water to

    • Control alkalinity and control vanadium

    • Convert scale forming salts to relatively harmless sludge

    • Neutralize the effects of hydrogen embrittlement

    • Decrease dissolved oxygen content

    Correct Answer
    A. Convert scale forming salts to relatively harmless sludge
    Explanation
    Phosphates are used in the chemical treatment of boiler water because they have the ability to convert scale forming salts into relatively harmless sludge. This helps to prevent the formation of scale deposits on the surfaces of the boiler, which can reduce its efficiency and lead to costly repairs. By converting these salts into sludge, the phosphates make it easier to remove them from the system, ensuring that the boiler operates smoothly and efficiently.

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  • 36. 

    Foaming in the boiler water is a result of

    • Carryover

    • Excessive suspended solids

    • Low water level

    • Excessive surface blows

    Correct Answer
    A. Excessive suspended solids
    Explanation
    Foaming in the boiler water is caused by excessive suspended solids. When the water in the boiler contains high levels of suspended solids, such as impurities or contaminants, it can lead to the formation of foam. This foam can interfere with the proper functioning of the boiler, causing issues such as reduced heat transfer, increased corrosion, and even boiler carryover. Therefore, it is important to control and minimize the levels of suspended solids in the boiler water to prevent foaming and maintain efficient boiler operation.

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  • 37. 

    Highly alkaline boiler water will contribute to the possible problem of

    • Caustic embrittlement

    • Scale formation

    • Calcium carbonate precipitation

    • Sodium sulfite reacting with dissolved oxygen

    Correct Answer
    A. Caustic embrittlement
    Explanation
    Highly alkaline boiler water can lead to caustic embrittlement. Caustic embrittlement is a condition where the metal of the boiler becomes brittle and prone to cracking due to the presence of high levels of alkaline substances, such as sodium hydroxide, in the water. This can occur when the pH of the water exceeds a certain threshold, causing the metal to undergo a process called alkaline attack. This can result in serious damage to the boiler and potential safety hazards.

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  • 38. 

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

    • Sense light from the burner flame

    • Control the modulating pressure control circuit

    • Open the control circuit upon sensing an intense flame

    • Close the control circuit upon sensing a flame failure

    Correct Answer
    A. Sense light from the burner flame
    Explanation
    The photoelectric cell installed in an automatically fired boiler is designed to sense light from the burner flame. This is important for combustion safety controls as it allows the system to monitor the presence and intensity of the flame. By sensing the light from the burner flame, the photoelectric cell can provide feedback to the control circuit, allowing it to make adjustments and ensure the proper functioning of the boiler.

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  • 39. 

    The lowest temperature at which fuel oil gives off sufficient vapors to burn continuously when ignited is defined as the

    • Burning temperature

    • Auto ignition temperature

    • Flash point

    • Fire point

    Correct Answer
    A. Fire point
    Explanation
    The fire point is the lowest temperature at which fuel oil gives off sufficient vapors to burn continuously when ignited. This temperature is higher than the flash point, which is the lowest temperature at which fuel oil gives off sufficient vapors to ignite momentarily when exposed to an open flame. The auto ignition temperature refers to the lowest temperature at which fuel oil can spontaneously ignite without an external ignition source. Therefore, the fire point is the most appropriate term to define the given scenario.

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  • 40. 

    Which of the significant combustible elements of the fuel oil is a major source of boiler corrosion?

    • Oxygen

    • Sulfur

    • Hydrogen

    • Carbon

    Correct Answer
    A. Sulfur
    Explanation
    Sulfur is a significant combustible element in fuel oil and is a major source of boiler corrosion. When fuel oil containing sulfur is burned, sulfur dioxide is produced. This sulfur dioxide combines with water vapor in the flue gas to form sulfuric acid, which is highly corrosive. This acid can corrode the boiler's metal surfaces, leading to damage and reduced efficiency. Therefore, sulfur is the correct answer as it is a major contributor to boiler corrosion in fuel oil.

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  • 41. 

    Deaerator feedwater is to prevent

    • Feed pump damage

    • Corrosion in the boiler

    • Lose of system vacuum

    • All of the above

    Correct Answer
    A. Corrosion in the boiler
    Explanation
    The purpose of a deaerator feedwater is to prevent corrosion in the boiler. Corrosion in the boiler can lead to damage and reduce the efficiency of the system. The deaerator removes dissolved oxygen and other gases from the feedwater, reducing the potential for corrosion. This helps to prolong the lifespan of the boiler and maintain its performance.

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  • 42. 

    Carbon dioxide gas dissolved in boiler wter is dangerous in modern power boiler because the gas is

    • Forms carbonic acid which attacks the waterside

    • Breaks the magnetic iron oxide film inside the boiler tubes

    • Combines with sulfates to cause severe waterside pitting

    • Combines with oxygen to severe waterside scaling

    Correct Answer
    A. Forms carbonic acid which attacks the waterside
    Explanation
    When carbon dioxide gas dissolves in boiler water, it forms carbonic acid. This carbonic acid is dangerous in modern power boilers because it attacks the waterside. This means that it corrodes and damages the surfaces of the boiler, leading to potential leaks and structural integrity issues. Therefore, the presence of carbonic acid in the boiler water can cause significant damage to the boiler system.

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  • 43. 

    A higher than normal boiler stack temperature usually indicates

    • Dirty fireside

    • Dirty water side

    • Fuel high in sulfur content

    • Incomplete combustion

    Correct Answer
    A. Dirty fireside
    Explanation
    A higher than normal boiler stack temperature usually indicates a dirty fireside. This means that there is a buildup of soot, ash, or other deposits on the fireside surfaces of the boiler. This buildup acts as an insulator, reducing heat transfer and causing the stack temperature to rise. It can be caused by factors such as inefficient combustion, poor fuel quality, or inadequate maintenance. Regular cleaning and maintenance of the fireside surfaces are necessary to prevent this buildup and maintain optimal boiler performance.

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  • 44. 

    In automated boiler operations a dirty flame scanner will most likely result in

    • Increase fuel oil consumption

    • Securing fuel oil to the burner

    • Load of forced draft air

    • Incomplete purge cycle

    Correct Answer
    A. Securing fuel oil to the burner
    Explanation
    A dirty flame scanner in automated boiler operations will most likely result in securing fuel oil to the burner. This is because a dirty flame scanner may not be able to accurately detect the presence of a flame, leading to the system shutting off the fuel supply as a safety measure. By securing the fuel oil to the burner, the risk of a potential fire or explosion is minimized.

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  • 45. 

    Low stack gas temperature should be avoided in order to reduce the

    • Percentage of carbon monoxide in the stack gas

    • Formation of sulfuric acid

    • Heat loss to the uptake

    • Accumulation of soot

    Correct Answer
    A. Formation of sulfuric acid
    Explanation
    Low stack gas temperature should be avoided in order to reduce the formation of sulfuric acid. When the stack gas temperature is low, the water vapor present in the flue gas can condense and combine with sulfur dioxide (SO2) to form sulfuric acid (H2SO4). This can lead to the formation of acid rain, which is harmful to the environment and can cause damage to buildings and infrastructure. By maintaining a higher stack gas temperature, the water vapor is less likely to condense, reducing the formation of sulfuric acid.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 24, 2012
    Quiz Created by
    Armymom
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