Ultimate Steam Boiler Trivia Quiz! Exam

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  • 1/48 Questions

    Water begins to boil at approximately ______ degrees F.

    • 0
    • 32
    • 100
    • 212
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About This Quiz

Dive into the Ultimate Steam Boiler Trivia Exam! This quiz assesses your knowledge on boiler operations, including boiling points, pressure levels, heat types, and combustion air control. Essential for aspiring engineers and professionals in the thermal sector.

Ultimate Steam Boiler Trivia Quiz! Exam - Quiz

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  • 2. 

    A low pressure boiler has a MAWP up to ______ psi.

    • 5

    • 6

    • 15

    • 75

    Correct Answer
    A. 15
    Explanation
    A low pressure boiler has a maximum allowable working pressure (MAWP) of up to 15 psi. This means that the boiler is designed to operate safely at a pressure of 15 pounds per square inch or lower. Operating at higher pressures could exceed the design limits of the boiler and lead to potential safety hazards. Therefore, it is important to ensure that the pressure in a low pressure boiler does not exceed 15 psi to maintain safe and efficient operation.

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  • 3. 

    Sensible heat:

    • Involves a change of state

    • Has no temperature change of the substance

    • Changes ice to water

    • Can be measured with a thermometer

    Correct Answer
    A. Can be measured with a thermometer
    Explanation
    Sensible heat refers to the heat that can be measured with a thermometer. This means that it is the type of heat that can be detected and quantified using a temperature measuring device. Sensible heat does not involve a change of state, meaning it does not cause a substance to change from one physical state to another. It also does not result in a temperature change of the substance itself. However, it can cause a change in the temperature of the surroundings or the environment in which the substance is present.

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  • 4. 

    ________ air that controls the combustion rate, which determines the amount of fuel burned.

    • Excess

    • Primary

    • Secondary

    • Pilot

    Correct Answer
    A. Primary
    Explanation
    Primary air refers to the air that is directly involved in the combustion process. It is the air that is mixed with the fuel to create the necessary conditions for combustion. The amount of primary air that is supplied to the combustion process determines the combustion rate, which in turn determines the amount of fuel that is burned. Therefore, primary air is the air that controls the combustion rate and the amount of fuel burned.

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  • 5. 

    The amount of energy required to aise the temperature of 1 lb of water one degree F is one _____.

    • NOWL

    • Therm

    • Psia

    • Btu

    Correct Answer
    A. Btu
    Explanation
    The correct answer is Btu. Btu stands for British thermal unit, which is a unit of energy commonly used in the United States. It is defined as the amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit. Therefore, one Btu is the amount of energy required to raise the temperature of 1 lb of water one degree F.

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  • 6. 

    Latent heat:

    • Involves a change of state and no temperature change

    • Raises the temperature of a substance

    • Occurs only with sensible heate

    • Can be measured with a thermometer

    Correct Answer
    A. Involves a change of state and no temperature change
    Explanation
    Latent heat refers to the heat energy absorbed or released during a change of state of a substance, such as from solid to liquid or from liquid to gas. During these changes, the temperature of the substance remains constant even though heat is being added or removed. This is because the heat energy is being used to break or form the intermolecular bonds between the particles of the substance, rather than increasing or decreasing the kinetic energy of the particles. Therefore, latent heat involves a change of state without any temperature change.

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  • 7. 

    The evaporation of 34.5 lb of water per hour from a feedwater temperature of 212 degree F is:

    • Factor of evaporation

    • One boiler horsepower

    • Latent heat of fusion

    • Evaporation test

    Correct Answer
    A. One boiler horsepower
    Explanation
    One boiler horsepower is the amount of energy required to evaporate 34.5 lb of water per hour from a feedwater temperature of 212 degrees Fahrenheit.

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  • 8. 

    The _________ regulates the burner from high to low fire.

    • Aquastat

    • Vaporstat

    • Pressure control

    • Modulating pressure control

    Correct Answer
    A. Modulating pressure control
    Explanation
    A modulating pressure control is responsible for regulating the burner from high to low fire. This control system adjusts the pressure of the fuel being supplied to the burner based on the demand for heat. As the demand decreases, the control system gradually reduces the pressure, resulting in a lower flame and less heat output. This allows for precise control over the burner's output, ensuring optimal efficiency and comfort.

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  • 9. 

    When blowing down a boiler, the quick-opening valve shuld always be opened and closed:

    • First; first

    • First; last

    • Last; first

    • Last;last

    Correct Answer
    A. First; last
    Explanation
    When blowing down a boiler, the quick-opening valve should always be opened first and closed last. This is because opening the valve first allows for the rapid release of high-pressure steam and water, which helps to remove sediment and impurities from the boiler. Closing the valve last ensures that any remaining debris is flushed out, preventing it from settling back into the boiler. Opening the valve last could cause debris to be sucked back into the system, potentially causing damage or reducing the efficiency of the boiler.

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  • 10. 

    The prupose of the safety valve is to prevent the pressure in the boiler from ___________.

    • Exceeding its MAWP

    • Dropping below its MAWP

    • Causing a boiler explosion

    • Relieving water pressure

    Correct Answer
    A. Exceeding its MAWP
    Explanation
    The purpose of the safety valve is to prevent the pressure in the boiler from exceeding its MAWP (Maximum Allowable Working Pressure). This is important because if the pressure goes beyond the MAWP, it can lead to a variety of dangerous situations, such as a boiler explosion. By relieving the excess pressure, the safety valve ensures that the boiler operates within safe limits and minimizes the risk of catastrophic failure.

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  • 11. 

    A _______ valve allows the flow of water in one direction only?

    • Gate

    • Glove

    • Os&y

    • Check

    Correct Answer
    A. Check
    Explanation
    A check valve is a type of valve that allows the flow of water in one direction only. It is designed to prevent backflow or reverse flow of water, ensuring that it only moves in a single direction. This is achieved through a mechanism that allows water to flow freely in one direction, but blocks it from flowing back in the opposite direction.

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  • 12. 

    A _______ test is a low water fuel cutoff test that allows the water level in the boiler to drop by shutting the feedwater pump off.

    • Hydrostatic

    • Pressure

    • Try lever

    • Evaporation

    Correct Answer
    A. Evaporation
    Explanation
    An evaporation test is a low water fuel cutoff test that allows the water level in the boiler to drop by shutting the feedwater pump off. During this test, the water in the boiler is allowed to evaporate, causing the water level to decrease. This test is used to ensure that the low water fuel cutoff device is working properly and will shut off the fuel supply if the water level in the boiler drops too low.

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  • 13. 

    The ________ controls the startinng and stopping of the burner by sensing the temperature in teh hot water boiler.

    • Flow control valve

    • Diverter fitting

    • Circulating pump

    • Aquastat

    Correct Answer
    A. Aquastat
    Explanation
    The aquastat is a device that controls the starting and stopping of the burner in a hot water boiler by sensing the temperature. It monitors the temperature of the water and adjusts the burner accordingly, ensuring that the water is heated to the desired temperature and preventing overheating.

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  • 14. 

    Condensate in teh steam lines can result in:

    • Greater boiler efficiency

    • Pure steam produced

    • Foaming

    • Water hammer

    Correct Answer
    A. Water hammer
    Explanation
    Condensate in the steam lines can result in water hammer. Water hammer is a phenomenon that occurs when a steam valve is suddenly closed, causing a rapid change in pressure and resulting in a loud banging noise. This can cause damage to the steam system and equipment. Therefore, the presence of condensate in the steam lines can lead to water hammer.

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  • 15. 

    When an os&y valve is open, the steam is in the position ___________.

    • Floating

    • Locked

    • Up

    • Down

    Correct Answer
    A. Up
    Explanation
    When an OS&Y (Outside Screw and Yoke) valve is open, the steam is in the position "up". This means that the valve is fully open and the steam is able to flow freely through the valve. The "up" position refers to the position of the valve stem, which is raised when the valve is open. This allows the steam to pass through the valve and continue its flow in the upward direction.

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  • 16. 

    Combustion is the __________ burning of all the fuel using the minimum amount of excess air.

    • Incomplete

    • Complete

    • Perfect

    • Imperfect

    Correct Answer
    A. Complete
    Explanation
    Complete combustion refers to the burning of fuel in the presence of an adequate amount of oxygen, resulting in the complete conversion of fuel into carbon dioxide and water. In this process, all the fuel is consumed, leaving no unburned residues. The term "complete" indicates that there is no excess fuel or air remaining after the combustion process.

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  • 17. 

    A __________ automatic combustion control is most commonly used on low pressure boilers.

    • ON/OFF

    • Positioning

    • Metering

    • Conbination

    Correct Answer
    A. ON/OFF
    Explanation
    An ON/OFF automatic combustion control is most commonly used on low pressure boilers because it provides a simple and cost-effective solution. This type of control system operates by turning the burner on or off based on the desired temperature or pressure setpoint. It does not modulate the fuel supply like a metering control system, nor does it combine multiple control methods like a combination control system. Therefore, for low pressure boilers where precise control is not as critical, an ON/OFF control is sufficient.

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  • 18. 

    A therm is equivalent to _______ Btu.

    • 100,000

    • 150,000

    • 500,000

    • 1,000,000

    Correct Answer
    A. 100,000
    Explanation
    A therm is a unit of energy measurement used in the natural gas industry. It is equivalent to 100,000 British Thermal Units (Btu). This means that 100,000 Btu is equal to one therm.

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  • 19. 

    When the teperature of fuel oil is raised its viscosity:

    • Remains the same

    • Is raised

    • Is lowered

    • Cannot be affected by heat

    Correct Answer
    A. Is lowered
    Explanation
    When the temperature of fuel oil is raised, its viscosity is lowered. This is because as the temperature increases, the molecules in the fuel oil gain more energy and move faster. This increased molecular motion causes the molecules to separate and flow more easily, resulting in a decrease in viscosity.

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  • 20. 

    _________ draft air that is pulled through the boiler (fan in breeching).

    • Induced

    • Forced

    • Combination

    • Natural

    Correct Answer
    A. Induced
    Explanation
    The correct answer is "Induced." In this context, "induced" refers to the action of pulling or drawing air through the boiler using a fan in the breeching. This means that the fan creates a pressure difference that causes air to flow into the boiler, rather than pushing air into it.

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  • 21. 

    Draft gauge measurements are expressed in inches of:

    • Mercury

    • Water column

    • Saturated steam

    • All of the above

    Correct Answer
    A. Water column
    Explanation
    Draft gauge measurements are expressed in inches of water column. This means that the gauge measures the pressure difference between two points by indicating the height of a column of water that would produce the same pressure difference. The measurement in inches of water column is commonly used in various industries, such as HVAC, to measure and monitor pressure differentials.

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  • 22. 

    A _______ is a simple draft gauge consisting of a U-shaped glass tube.

    • Pyrometer

    • Dynometer

    • Manometer

    • Trynometer

    Correct Answer
    A. Manometer
    Explanation
    A manometer is a simple draft gauge consisting of a U-shaped glass tube. It is used to measure the pressure of a gas or liquid. The U-shaped tube is filled with a liquid, and the pressure of the gas or liquid being measured causes the liquid to rise or fall in one side of the tube. This displacement can then be used to determine the pressure. A pyrometer is used to measure high temperatures, a dynometer is used to measure force or torque, and a trynometer is not a recognized instrument.

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  • 23. 

    Water that contains large quantities of minerals is called _______.

    • Soft water

    • Hard water

    • Sludge

    • Sediment

    Correct Answer
    A. Hard water
    Explanation
    Hard water is water that contains high levels of dissolved minerals, such as calcium and magnesium. These minerals are acquired as the water passes through rocks and soil, dissolving the minerals along the way. Hard water can cause issues such as scale buildup in pipes and appliances, reduced effectiveness of soaps and detergents, and can leave spots on dishes and fixtures.

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  • 24. 

    ________ is a condition caused when steam bubbles are trapped below the boiler water surface.

    • Sludge slugging

    • Foaming

    • Priming

    • Tube corrosion

    Correct Answer
    A. Foaming
    Explanation
    Foaming is a condition caused when steam bubbles are trapped below the boiler water surface. This can occur due to the presence of impurities or excessive amounts of dissolved solids in the water. When these impurities or solids reach high concentrations, they can create a layer of foam on the water surface, which prevents the steam bubbles from escaping. This can lead to issues such as reduced boiler efficiency, increased corrosion, and even damage to the boiler equipment.

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  • 25. 

    In the boiler water __________ causes corrosion and pitting of the boiler metal.

    • Sodium solfite

    • Sodium solfate

    • Carbon dioxide

    • Oxygen

    Correct Answer
    A. Oxygen
    Explanation
    Oxygen in the boiler water causes corrosion and pitting of the boiler metal. Oxygen reacts with the metal surface, leading to the formation of metal oxides and weakening the structure. This process is known as oxidation. Corrosion and pitting can result in damage to the boiler, reducing its efficiency and lifespan. Therefore, it is important to remove or reduce the presence of oxygen in the boiler water to prevent these issues.

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  • 26. 

    Nonadhering sludge is removed from the boiler by using a:

    • Bottom try cock

    • Gauge glass blowdown valve

    • Bottom blowdown valve

    • Surface blowdown valve

    Correct Answer
    A. Bottom blowdown valve
    Explanation
    The correct answer is the bottom blowdown valve. This valve is used to remove nonadhering sludge from the boiler. It is located at the bottom of the boiler and allows for the release of water and sediment that has settled at the bottom. This helps to maintain the efficiency and safety of the boiler by preventing the buildup of harmful deposits.

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  • 27. 

    Boiler water with a pH less than 7 is:

    • Alkaline

    • Acidic

    • Neutral

    • None of the above

    Correct Answer
    A. Acidic
    Explanation
    Boiler water with a pH less than 7 is considered acidic. pH is a measure of the acidity or alkalinity of a solution, with values below 7 indicating acidity. In the context of boiler water, acidic pH levels can be detrimental as they can lead to corrosion of the boiler system. Therefore, it is important to maintain the pH of boiler water within the appropriate range to prevent damage and ensure efficient operation.

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  • 28. 

    Bottom blowdown is best performed when the boiler is:

    • Under light load

    • Under heavy load

    • At maximum steam pressure

    • Being tested

    Correct Answer
    A. Under light load
    Explanation
    Bottom blowdown is the process of removing sediment and impurities from the bottom of a boiler. Performing this procedure under light load is the best option because the boiler is operating at a lower capacity, which means there is less steam production and lower pressure. This allows for a safer and more efficient blowdown process, as there is less risk of excessive pressure buildup or steam release. Additionally, performing bottom blowdown under light load ensures that the boiler remains in operation and can continue to produce steam without interruption.

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  • 29. 

    Oxygen in teh boiler will cause __________.

    • Scale

    • Pitting of boiler metal

    • Caustic embrittlement

    • Carryover

    Correct Answer
    A. Pitting of boiler metal
    Explanation
    Oxygen in the boiler can cause pitting of the boiler metal. Pitting refers to localized corrosion that leads to the formation of small holes or pits on the metal surface. When oxygen is present in the boiler, it can react with the metal and create an electrochemical process that leads to the formation of pits. These pits can weaken the metal structure and compromise the integrity of the boiler, potentially causing leaks or failures. Therefore, it is important to control the oxygen levels in the boiler to prevent pitting and ensure its safe operation.

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  • 30. 

    The first thing a boiler operator should do when taking over a shift:

    • Read the boiler room log

    • Check the fuel supply

    • Blow down the flash tank

    • Check the boiler water level

    Correct Answer
    A. Check the boiler water level
    Explanation
    Checking the boiler water level is the first thing a boiler operator should do when taking over a shift. This is important because a low water level can lead to overheating and damage to the boiler. By checking the water level, the operator ensures that there is enough water to properly cool and maintain the boiler's temperature. It is a crucial step in ensuring the safe and efficient operation of the boiler.

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  • 31. 

    When the low water fuel cutoff is blown down:

    • Water in the gauge glass will rise

    • Foam is increased

    • Burner should shut off

    • None of the above

    Correct Answer
    A. Burner should shut off
    Explanation
    When the low water fuel cutoff is blown down, it means that the water level in the boiler has dropped below the safe operating level. In this situation, the burner should shut off automatically to prevent any damage or unsafe conditions. Shutting off the burner is crucial to avoid overheating and potential explosions. Therefore, the correct answer is that the burner should shut off.

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  • 32. 

    When the flame scanner is removed with the burner firing:

    • Fuel valve should open

    • Programmer should start the firing cycle

    • Burner should shut down

    • All of the above

    Correct Answer
    A. Burner should shut down
    Explanation
    When the flame scanner is removed with the burner firing, the flame scanner is responsible for detecting the presence of a flame. If it is removed, it means that the burner will not be able to detect whether there is a flame or not. As a safety measure, the burner should shut down to prevent any potential hazards or accidents that may occur in the absence of flame detection.

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  • 33. 

    During a boiler inspection the nain steam stop valve is:

    • Open and tagged out

    • Closed and tagged out

    • Opened partially to allow steam flow

    • None of the above

    Correct Answer
    A. Closed and tagged out
    Explanation
    The main steam stop valve is closed and tagged out during a boiler inspection. This is done to ensure the safety of the inspection process by preventing the flow of steam. Closing the valve stops the supply of steam to the boiler, reducing the risk of accidents or injuries. Tagging out the valve involves attaching a tag or lock to indicate that it should not be operated while the inspection is in progress. This helps to communicate the status of the valve to other personnel and prevents unauthorized operation.

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  • 34. 

    A low water condition requires immediately:

    • Securing feedwater to the boiler

    • Opening the boiler vent

    • Closing steam lines

    • Securing fuel to the boiler

    Correct Answer
    A. Securing fuel to the boiler
    Explanation
    In a low water condition, there is a risk of overheating and damaging the boiler. To prevent this, it is necessary to secure the fuel to the boiler. By cutting off the fuel supply, the boiler will stop generating heat and reduce the chances of further damage. This action is crucial to ensure the safety of the equipment and prevent any potential accidents or malfunctions.

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  • 35. 

    A furnace explosion can be caused by:

    • Excess draft

    • A low water condition

    • An overheated furnace

    • An accumulation of combustible gases

    Correct Answer
    A. An accumulation of combustible gases
    Explanation
    An accumulation of combustible gases can cause a furnace explosion. When there is a buildup of gases like natural gas or propane in the furnace, it creates a highly flammable environment. If there is a spark or ignition source present, it can lead to an explosion. It is important to ensure proper ventilation and regular maintenance of the furnace to prevent the accumulation of combustible gases and minimize the risk of explosions.

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  • 36. 

    Water pressure per vertical food exerted at the base of a column of water is ___________ pressure.

    • Normal operating water

    • Electrostatic

    • Hydrostatic

    • None of the above

    Correct Answer
    A. Hydrostatic
    Explanation
    Hydrostatic pressure refers to the pressure exerted by a fluid at rest due to the weight of the fluid above it. In the given question, the pressure exerted by the column of water is being discussed. Since the water is at rest and its weight is causing the pressure, it aligns with the definition of hydrostatic pressure. Therefore, hydrostatic is the correct answer.

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  • 37. 

    The _______ protects the hot water heating system from exceeding the MAWP.

    • Aquastat

    • Safety valve

    • Safety relief valve

    • Compression tank

    Correct Answer
    A. Safety relief valve
    Explanation
    The safety relief valve protects the hot water heating system from exceeding the MAWP (Maximum Allowable Working Pressure). This valve is designed to release excess pressure from the system, preventing any potential damage or failure. It acts as a safety measure to ensure that the pressure within the system does not reach dangerous levels.

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  • 38. 

    When the boiler is removed from service the first thing to do is:

    • Tag the system stop valves

    • Coat the tubes with oil to prevent rusting

    • Drill drain holes to ensure removal of water

    • All of the above

    Correct Answer
    A. Drill drain holes to ensure removal of water
    Explanation
    When the boiler is removed from service, the first thing to do is to drill drain holes to ensure the removal of water. This is important to prevent the accumulation of water in the boiler, which can lead to rusting and damage. By drilling drain holes, any remaining water can be effectively drained out, reducing the risk of corrosion and prolonging the lifespan of the boiler. Tagging the system stop valves and coating the tubes with oil may also be necessary steps, but they are not the first priority when removing the boiler from service.

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  • 39. 

    The ________ should be opened to prevent a vacuum in the boiler before opening a manhole.

    • Feedwater pump

    • Vacuum tank

    • Boiler vent

    • Blowdown

    Correct Answer
    A. Boiler vent
    Explanation
    To prevent a vacuum in the boiler before opening a manhole, the boiler vent should be opened. The boiler vent is a device that allows the release of excess pressure and air from the boiler system. By opening the boiler vent, any built-up pressure or air inside the boiler can be safely released, preventing a vacuum from occurring when the manhole is opened. This ensures the safety of the personnel performing maintenance or inspection on the boiler.

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  • 40. 

    A boiler has heat and gases of combustion that pass through tubes surrounded by water:

    • Firetube

    • Watertube

    • Cast iron sectional

    • Straight-tube

    Correct Answer
    A. Firetube
    Explanation
    A firetube boiler is the correct answer because in this type of boiler, the heat and gases of combustion pass through tubes that are surrounded by water. The fire is inside the tubes, and the water is outside, which allows for efficient heat transfer. This design is commonly used in industrial applications where high steam pressure and temperature are required.

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  • 41. 

    ___________ draft is pushed through the boiler:

    • Induced

    • Forced

    • Combination

    • Natural

    Correct Answer
    A. Forced
    Explanation
    In a boiler, a forced draft refers to the process of air being pushed into the combustion chamber by a fan or blower. This helps to create a strong and consistent air flow, ensuring efficient combustion and heat transfer. In contrast, induced draft involves the use of a fan or blower to pull air out of the combustion chamber. In this question, the correct answer is "forced" because it specifically mentions that the draft is being pushed through the boiler, indicating the use of a fan or blower to create the necessary air flow.

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  • 42. 

    A flow control valve in a hot water heating system functions similar to a _________ valve to prevent water from circulating from natural circulation.

    • Air separator

    • Pressure reducing

    • Check

    • Gate

    Correct Answer
    A. Check
    Explanation
    A flow control valve in a hot water heating system functions similar to a check valve to prevent water from circulating from natural circulation. The purpose of a check valve is to allow fluid to flow in only one direction and prevent backflow. In the context of a hot water heating system, the flow control valve acts as a check valve by ensuring that water flows in the desired direction and does not circulate back through the system.

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  • 43. 

    The number and type of fire extinguishers needed are determined by:

    • How fast the fire may stpread

    • Potential heat intensity

    • Accessibility to fire

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The number and type of fire extinguishers needed are determined by several factors. Firstly, the speed at which the fire may spread is crucial in determining the number of extinguishers required. If the fire spreads quickly, more extinguishers will be needed to effectively control it. Secondly, the potential heat intensity of the fire plays a role in determining the type of extinguisher needed. Different types of extinguishers are designed to handle different levels of heat intensity. Lastly, the accessibility to the fire is an important factor as it determines how quickly the extinguishers can be deployed. Therefore, all of the above factors need to be considered in determining the number and type of fire extinguishers needed.

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  • 44. 

    A __________ is a control that functions as the mastermind of the burnerr control system to control the firing cycle.

    • Pressure control

    • Butterfly solenoid

    • Flow control valve

    • Programmer

    Correct Answer
    A. Programmer
    Explanation
    A programmer is a control that functions as the mastermind of the burner control system to control the firing cycle. It is responsible for coordinating and sequencing the various operations of the burner, such as ignition, fuel supply, and flame monitoring. The programmer ensures that the burner operates in a safe and efficient manner by controlling the timing and duration of each step in the firing cycle.

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  • 45. 

    The low water cutt-off is tested:

    • Every 30 days

    • Weekly

    • Monthly

    • Daily

    Correct Answer
    A. Daily
    Explanation
    The low water cut-off is a safety device used in boilers to prevent damage caused by low water levels. It is essential to test this device daily to ensure its proper functioning and prevent any potential hazards. By testing it daily, any malfunction or failure can be detected promptly, allowing for immediate repairs or maintenance to be carried out. This regular testing helps to ensure the safety and efficiency of the boiler system.

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  • 46. 

    The purpose of the safety relief is to protect the boiler:

    • Exceeding its MAWP steam pressure

    • Exceeding its MAWP water pressure

    • Causing a boiler explosion

    • Relieving normal water pressure

    Correct Answer
    A. Exceeding its MAWP water pressure
    Explanation
    The purpose of the safety relief is to protect the boiler from exceeding its MAWP (Maximum Allowable Working Pressure) water pressure. This means that when the water pressure inside the boiler reaches or exceeds the maximum safe limit, the safety relief valve opens to release the excess pressure and prevent any potential damage or explosion.

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  • 47. 

    A fire caused by oil, gas, grease, or paint is a Class _____ Fire.

    • A

    • B

    • C

    • D

    Correct Answer
    A. B
    Explanation
    A fire caused by oil, gas, grease, or paint is classified as a Class B fire. This is because Class B fires involve flammable liquids and gases. These types of fires require a different type of extinguishing agent, such as foam or carbon dioxide, compared to other classes of fires.

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  • 48. 

    What group of safety devices will lock the boiler out on safety-interlock?

    • Safety Valve, Low Water Fuel Cutoff, and Flame Scanner

    • High Gas-Pressure Switch, High Limit Switch, and Fusible Plug

    • Low Fire Limit Switch, Safety Relief Valve, and Flame Scanner

    • Low Gas-Pressure Switch, High Temperature Aquastat, and Air Proving Switch

    Correct Answer
    A. Low Gas-Pressure Switch, High Temperature Aquastat, and Air Proving Switch
    Explanation
    The group of safety devices that will lock the boiler out on safety-interlock includes the Low Gas-Pressure Switch, High Temperature Aquastat, and Air Proving Switch. These devices are designed to monitor and control various aspects of the boiler's operation to ensure safety. The Low Gas-Pressure Switch detects if the gas pressure falls below a certain threshold, indicating a potential issue. The High Temperature Aquastat monitors the temperature of the water in the boiler and can shut it down if it exceeds a safe level. The Air Proving Switch ensures that there is sufficient airflow for combustion. If any of these devices detect a problem, they will trigger a lockout to shut down the boiler and prevent further operation until the issue is resolved.

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