Boiler Exam Class 1a

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Boiler Exam Class 1a - Quiz

For you to adequately understand course it is important to ensure that you take up quizzes that test out what you have learnt so far. The Boiler Exam review quiz from Class 1a below is perfect for that. Give it a shot and see if you need to get a tutor before the finals.


Questions and Answers
  • 1. 

    What is the unit called that controls the starting and stopping of the burner by sensing the temperature of the water in a hot water boiler?

    • A.

      Aquastat

    • B.

      Mamoneter

    • C.

      Flow control valve

    • D.

      Vapor stat

    Correct Answer
    A. Aquastat
    Explanation
    An aquastat is a unit that controls the starting and stopping of the burner in a hot water boiler by sensing the temperature of the water. It is responsible for maintaining the desired temperature by turning the burner on when the water temperature falls below a certain set point and turning it off when the temperature reaches the desired level. The aquastat helps to ensure that the water in the boiler remains at the appropriate temperature for efficient and safe operation.

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  • 2. 

    3-1    the temperature of the water in a hot water boiler system can be controlled by

    • A.

      The fuel air ratio that is forced to the chimney or stack.

    • B.

      The two types of circulation used in the system

    • C.

      Aquastats or a remote temperature monitoring system

    • D.

      The diverter fittings

    Correct Answer
    C. Aquastats or a remote temperature monitoring system
    Explanation
    The correct answer is aquastats or a remote temperature monitoring system. Aquastats are devices that monitor and control the temperature of the water in a hot water boiler system. They can be set to maintain a specific temperature by turning the boiler on or off as needed. A remote temperature monitoring system is another option for controlling the temperature. It allows the user to monitor and adjust the temperature remotely, providing convenience and flexibility. Both aquastats and remote temperature monitoring systems are effective methods for controlling the temperature in a hot water boiler system.

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  • 3. 

    4-1       in addition to a    code    safety relief valve what other safety device should be installed on a hot   water heating boiler

    • A.

      A low water fuel cutoff

    • B.

      A feed water valve

    • C.

      A feed water regulator

    • D.

      A purge valve

    Correct Answer
    A. A low water fuel cutoff
    Explanation
    In addition to a code safety relief valve, a low water fuel cutoff should be installed on a hot water heating boiler. This safety device is important because it helps prevent the boiler from operating when the water level drops below a certain point. This can help prevent damage to the boiler and potential hazards caused by overheating.

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  • 4. 

    5-1     what removes air from a hot water boiler system

    • A.

      Anti siphon

    • B.

      Baffles inside the the boiler

    • C.

      Flow control

    • D.

      Air control

    Correct Answer
    D. Air control
    Explanation
    Air control is the correct answer because it refers to the mechanism or device that is responsible for removing air from a hot water boiler system. Air can accumulate in the system and cause inefficiency or blockages, so an air control device is necessary to ensure proper functioning. It helps to maintain the optimal air-to-water ratio in the boiler system, allowing for efficient heating and preventing potential issues.

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  • 5. 

    6-1     if a circulating pump fails what valve can be manual opened to provide hot water to the heating units through natural circulation

    • A.

      Flow control valves

    • B.

      Safty relief valve

    • C.

      Back flow preventer valve

    • D.

      Check valve

    Correct Answer
    A. Flow control valves
    Explanation
    If a circulating pump fails, flow control valves can be manually opened to provide hot water to the heating units through natural circulation. Flow control valves regulate the flow rate of the water, allowing it to move through the system even without the circulating pump. By manually opening the flow control valves, hot water can still be supplied to the heating units, ensuring that the heating system continues to function properly.

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  • 6. 

    10-1     in a   steam boiler system, the unit that turns the burner on and off based on steam pressure is the

    • A.

      Pressure control

    • B.

      Potentiometer

    • C.

      Manometer

    • D.

      Altimeter

    Correct Answer
    A. Pressure control
    Explanation
    In a steam boiler system, the unit that turns the burner on and off based on steam pressure is the pressure control. This control device is responsible for maintaining a safe and efficient operation of the boiler by regulating the pressure inside the system. It ensures that the pressure does not exceed the predetermined limit, preventing any potential damage or accidents. The pressure control acts as a safety mechanism, allowing the burner to be turned on when the pressure drops below a certain threshold and shutting it off when the pressure reaches the desired level.

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  • 7. 

    11-1      gauge pressure plus 14.7 is called what

    • A.

      Atmospheric pressure

    • B.

      Operating pressure

    • C.

      Absolute pressure

    • D.

      Positive pressure

    Correct Answer
    C. Absolute pressure
    Explanation
    Absolute pressure is the sum of gauge pressure and atmospheric pressure. Gauge pressure is the pressure measured relative to atmospheric pressure, so adding atmospheric pressure to gauge pressure gives the total pressure exerted by a fluid. Therefore, the correct answer is absolute pressure.

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  • 8. 

    13-1    when a safety valve opens and closes rapid, it is referred to as

    • A.

      Popping

    • B.

      Chattering

    • C.

      Pressuring

    • D.

      Huddling

    Correct Answer
    B. Chattering
    Explanation
    When a safety valve opens and closes rapidly, it is referred to as "chattering". This term is used to describe the rapid, repetitive movement of the valve as it tries to maintain the desired pressure within a system. Chattering can occur due to various reasons such as improper valve sizing, high system pressure, or a malfunctioning valve. It is important to address chattering issues promptly as it can lead to valve damage, reduced efficiency, and potential safety hazards.

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  • 9. 

    14-1     furnace explosins are caused by a build up  of conbustible gases, or vapors in the furnace.   what is the term used to remedy this condition

    • A.

      Draft diverting

    • B.

      Modulating

    • C.

      Purging

    • D.

      Hudding

    Correct Answer
    C. Purging
    Explanation
    Furnace explosions can occur when there is a buildup of combustible gases or vapors in the furnace. To remedy this condition, the term used is "purging". Purging involves removing or flushing out the combustible gases or vapors from the furnace before igniting it, ensuring that the furnace is safe to operate.

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  • 10. 

    14-1    furnace explosions are caused by a build   up of conbustible gases   or vapors in the furnace..   what is the term used to remedy this condition

    • A.

      Draft diverting

    • B.

      Modulating

    • C.

      Purging

    • D.

      Huddling

    Correct Answer
    C. Purging
    Explanation
    Purging is the term used to remedy the condition of a build-up of combustible gases or vapors in the furnace. Purging involves removing or displacing these gases and vapors from the furnace to prevent the risk of explosions.

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  • 11. 

    15-1    when steam on a steam boiler system is blowing into the vacuum pump or condensate tank,   what could be the problem?

    • A.

      Saftety valve malfunction

    • B.

      Automatic feedwater malfunction

    • C.

      steam gauge malfunction

    • D.

      Steam trap malfunction

    Correct Answer
    D. Steam trap malfunction
    Explanation
    If steam from a steam boiler system is blowing into the vacuum pump or condensate tank, the most likely problem is a malfunctioning steam trap. A steam trap is a device used to remove condensate and non-condensable gases from the steam system. It is designed to allow condensate to pass through while blocking the passage of steam. If the steam trap is malfunctioning, it may not be able to properly separate the steam from the condensate, causing steam to blow into the vacuum pump or condensate tank.

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  • 12. 

    16-1    the unit that shuts off the burner in the event of low water is the 

    • A.

      Stop and check valve

    • B.

      Safty valve

    • C.

      Low water fuel cut off

    • D.

      Boiler feed stop valve

    Correct Answer
    C. Low water fuel cut off
    Explanation
    The low water fuel cut off is the unit that shuts off the burner in the event of low water. This safety feature is essential in preventing damage to the boiler and ensuring that it operates efficiently. If the water level in the boiler drops below a certain point, the low water fuel cut off automatically stops the burner to prevent overheating and potential hazards. It helps maintain the proper water level and protects the boiler from damage caused by low water conditions.

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  • 13. 

    18-1     in a steam boiler system what is the term used for replacing the water that has been lost by blowing down the boiler or through leaks in the system

    • A.

      Equalizing line

    • B.

      Water hammer

    • C.

      Make up water

    • D.

      Water differential

    Correct Answer
    C. Make up water
    Explanation
    Make up water is the term used for replacing the water that has been lost in a steam boiler system. This water is added to the system to compensate for water that has been lost through blowing down the boiler or leaks in the system.

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  • 14. 

    21-1    what area of the boiler shall be computed as heating surface

    • A.

      The total area of the fireside and water side

    • B.

      The water side minus the fireside areas

    • C.

      The surface exposed to the products of combustion

    • D.

      The total area of the steam space where evaporation takes place

    Correct Answer
    D. The total area of the steam space where evaporation takes place
    Explanation
    The correct answer is the total area of the steam space where evaporation takes place. This is because the heating surface of a boiler refers to the area where heat is transferred to the water to produce steam. This process occurs in the steam space where evaporation takes place. The other options mentioned, such as the fireside and water side areas, or the surface exposed to the products of combustion, are not specifically related to the area where evaporation occurs. Therefore, they are not the correct answers.

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  • 15. 

    26-1     the  evaporation of 34.5 pounds of water per hour from and at a temperature of 212 degrees f    is defined as

    • A.

      One boiler horsepower

    • B.

      The latent heat of fusion

    • C.

      The factor of evaporation

    • D.

      An evaporaton test

    Correct Answer
    A. One boiler horsepower
    Explanation
    One boiler horsepower is defined as the amount of energy required to evaporate 34.5 pounds of water per hour from and at a temperature of 212 degrees Fahrenheit. This unit of measurement is commonly used in the boiler industry to determine the power output of a boiler.

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  • 16. 

    27-1     when a discharge pipe is installed on a safety valve,   the cross sectional are shall:

    • A.

      Be three times the full area of the valve outlet

    • B.

      Be not less than the full area of the valve outlet

    • C.

      Be tow times the full area of the valve outlet

    • D.

      Be reduced to one pipe size lower

    Correct Answer
    B. Be not less than the full area of the valve outlet
    Explanation
    When a discharge pipe is installed on a safety valve, the cross-sectional area should be not less than the full area of the valve outlet. This ensures that the flow of fluid through the discharge pipe is not restricted, allowing for proper discharge of excess pressure. If the cross-sectional area of the discharge pipe is smaller than the full area of the valve outlet, it could cause back pressure and potentially lead to a malfunction or failure of the safety valve. Therefore, it is important for the cross-sectional area to be equal to or larger than the full area of the valve outlet.

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  • 17. 

    29-1     on a one pipe    steam heating boiler system, what is used to distribute steam and also to return the condensate

    • A.

      The same pipe

    • B.

      The circulating pump

    • C.

      The bypass line

    • D.

      The back flow preventor valve

    Correct Answer
    A. The same pipe
    Explanation
    In a one pipe steam heating boiler system, the same pipe is used to both distribute steam and return the condensate. This means that the steam flows through the pipe to heat the system, and then the condensed steam (condensate) flows back through the same pipe to be reheated. This design simplifies the system by eliminating the need for separate pipes for distribution and condensate return.

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  • 18. 

    35-1     on a fire tube boiler, the water

    • A.

      Surrounds the tubes

    • B.

      Is inside the tubes

    • C.

      Is inside and outside the tubes

    • D.

      There is no water in a fire tube boiler

    Correct Answer
    A. Surrounds the tubes
    Explanation
    In a fire tube boiler, the water surrounds the tubes. This means that the tubes carrying the hot gases produced by the combustion process are immersed in water. The heat from the gases is transferred to the water through the tube walls, heating it and producing steam. This design allows for efficient heat transfer and is commonly used in smaller, low-pressure boilers.

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  • 19. 

    37-1    when two valves are used on the bottom blowdown line of a steam boiler, what valve is located closest to the boiler shell

    • A.

      The quick opening valve

    • B.

      The non return valve

    • C.

      The ball valve

    • D.

      The check valve

    Correct Answer
    A. The quick opening valve
    Explanation
    The quick opening valve is located closest to the boiler shell when two valves are used on the bottom blowdown line of a steam boiler.

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  • 20. 

    43-1    in some heating unit systems , the circulatng pump  is controlled by

    • A.

      Thermostat

    • B.

      Water pressure

    • C.

      Heating unit pressure

    • D.

      Water head

    Correct Answer
    A. Thermostat
    Explanation
    The correct answer is thermostat. In heating unit systems, the circulating pump is controlled by a thermostat. The thermostat measures the temperature in the system and signals the pump to turn on or off based on the desired temperature set by the user. The thermostat helps maintain a consistent temperature by regulating the operation of the circulating pump.

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  • 21. 

    44-1    the capacity of a safety valve used on a steam boiler is measured in 

    • A.

      Pounds of steam shown on the steam gauge

    • B.

      The amount of steam that can be discharged in one hour

    • C.

      Pounds of steam per minute

    • D.

      The time it takes to bring the boiler up to the working pressure

    Correct Answer
    B. The amount of steam that can be discharged in one hour
    Explanation
    The capacity of a safety valve used on a steam boiler is measured in the amount of steam that can be discharged in one hour. This means that the safety valve is designed to release a certain volume of steam per hour to prevent the pressure inside the boiler from exceeding safe levels. By measuring the capacity in terms of steam discharge per hour, it ensures that the safety valve can adequately handle the steam produced by the boiler and prevent any potential accidents or damage.

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  • 22. 

    45-1    in a steam boiler system, the condensate is removed from the heating equipment by a 

    • A.

      Globe valve

    • B.

      Stainer

    • C.

      Steam trap

    • D.

      Pipe reducer

    Correct Answer
    C. Steam trap
    Explanation
    A steam trap is used to remove condensate from a steam boiler system. Condensate is formed when steam cools down and turns back into water. The steam trap is designed to automatically drain the condensate from the system while preventing the loss of steam. It operates based on the principle of temperature and pressure differentials, allowing condensate to be discharged while keeping steam inside the system. This helps to maintain the efficiency and performance of the heating equipment by ensuring that only steam is circulated, preventing water buildup which can cause damage or inefficiency.

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  • 23. 

    47-1    the control designed as a safety backup, should the pressure control fail is

    • A.

      Modulating pressure control

    • B.

      High limit control

    • C.

      End switch

    • D.

      Sail switch

    Correct Answer
    B. High limit control
    Explanation
    The correct answer is high limit control. The high limit control is designed to act as a safety backup in case the pressure control fails. It is responsible for monitoring and controlling the maximum pressure level in a system. If the pressure exceeds the set limit, the high limit control will activate and shut down the system to prevent any damage or safety hazards.

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  • 24. 

    48-1    how does a pressure control attached to the steam space of a boiler control the burner operation

    • A.

      Burner starts on pressure decrease, and stops on pressure increase

    • B.

      Starts burner on pressure increase

    • C.

      Stops burner on pressure decrease

    • D.

      Controls (or stops) the burner on low incoming fuel pressure

    Correct Answer
    A. Burner starts on pressure decrease, and stops on pressure increase
    Explanation
    A pressure control attached to the steam space of a boiler controls the burner operation by starting the burner when there is a decrease in pressure and stopping it when there is an increase in pressure. This ensures that the burner is activated when the pressure drops below a certain threshold, indicating a need for more steam, and is deactivated when the pressure rises above a certain threshold, indicating that the desired pressure has been reached. This control mechanism helps maintain a stable pressure level in the boiler and prevents over-pressurization or under-pressurization.

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  • 25. 

    49-1    the purpose of a safety valve on a steam boiler is to

    • A.

      Regulate or control an even amount of steam pressure

    • B.

      Safely return the condensate back to the boiler

    • C.

      Prevent the pressure in a steam boiler from exceeding its maximum allowable working pressure

    • D.

      Sheck the safety of the steam gauge

    Correct Answer
    C. Prevent the pressure in a steam boiler from exceeding its maximum allowable working pressure
    Explanation
    The purpose of a safety valve on a steam boiler is to prevent the pressure in the boiler from exceeding its maximum allowable working pressure. This is important because if the pressure exceeds the maximum limit, it can lead to a dangerous situation where the boiler may explode or cause damage. The safety valve acts as a safeguard by releasing excess pressure and maintaining a safe operating pressure within the boiler. It ensures the safety of the boiler and the people working with it.

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  • 26. 

    52-1    a device which prevents contaminated water from entering the domestic water supply is called

    • A.

      Pressure control

    • B.

      Relief valve

    • C.

      Back flow preventer

    • D.

      Purge valve

    Correct Answer
    C. Back flow preventer
    Explanation
    A backflow preventer is a device that is used to prevent contaminated water from flowing back into the domestic water supply. It ensures that water flows in only one direction, preventing any potential contamination from entering the clean water supply. This is important for maintaining the safety and quality of drinking water.

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  • 27. 

    53-1     boiler are considered low pressure when

    • A.

      Steam boiler are not over 15psi and liquid boiler are not over 160 pzi and or 250 deg F

    • B.

      Steam boiler are not over 30 psi and liquid boilers not over 100 psi and or 212 def F

    • C.

      Steam boilers are not over 100 psi and or 212 deg F

    • D.

      Steam boiler are not over 30 psi and liquid boilers not over 50 psi and or 212 deg F

    Correct Answer
    A. Steam boiler are not over 15psi and liquid boiler are not over 160 pzi and or 250 deg F
    Explanation
    The correct answer states that low-pressure steam boilers are defined as those that are not over 15 psi and liquid boilers are not over 160 psi and/or 250 degrees Fahrenheit. This means that if a steam boiler operates at a pressure below 15 psi or a liquid boiler operates at a pressure below 160 psi and/or 250 degrees Fahrenheit, it is considered a low-pressure boiler.

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  • 28. 

    55-1     what boiler license is required for operating boiler as a shift engineer in a plant having 3  boilers, each having 1200 sq ft of heating surace

    • A.

      Sp

    • B.

      2nd

    • C.

      1st

    • D.

      Chief

    Correct Answer
    C. 1st
    Explanation
    The correct answer is "1st". The first-class boiler license is required for operating boilers as a shift engineer in a plant with three boilers, each having 1200 sq ft of heating surface. This license indicates that the individual has the necessary knowledge and experience to safely operate and maintain boilers of this size and complexity.

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  • 29. 

    1-2    in a hot water boiler system, what valve is installed to reduce the incoming    city water pressure to the hot water boiler operating pressure

    • A.

      Back flow preventor valve

    • B.

      Safety relief valve

    • C.

      Pressure reducing valve

    • D.

      Modulatng check valve

    Correct Answer
    C. Pressure reducing valve
    Explanation
    In a hot water boiler system, a pressure reducing valve is installed to reduce the incoming city water pressure to the hot water boiler operating pressure. This valve helps to regulate and control the pressure in the system, ensuring that it does not exceed the maximum operating pressure of the boiler. By reducing the pressure, it helps to prevent damage to the boiler and other components of the system.

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  • 30. 

    2-1     when adding water to a hot water heating system, if the pressure gauge rises quickly it is an indication 

    • A.

      Too much air in the system

    • B.

      That expansion tank is water logged

    • C.

      Water temperature is too high

    • D.

      Water temperature is too low

    Correct Answer
    B. That expansion tank is water logged
    Explanation
    When water is added to a hot water heating system and the pressure gauge rises quickly, it indicates that the expansion tank is water logged. This means that the tank, which is designed to accommodate the expansion of water as it heats up, is filled with water instead of having the necessary air space. As a result, there is no room for the water to expand, causing the pressure to rise rapidly.

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  • 31. 

    3-1   the popping pressure of a safety relief valve on a low pressure hot water heating boiler cannot excceed

    • A.

      15 psi

    • B.

      160 psi

    • C.

      50 psi

    • D.

      100 psi

    Correct Answer
    B. 160 psi
    Explanation
    The popping pressure of a safety relief valve on a low pressure hot water heating boiler cannot exceed 160 psi. This means that the valve is designed to open and release pressure from the boiler when it reaches or exceeds 160 psi, preventing any potential damage or explosion due to excessive pressure. It is important to have a safety relief valve in place to maintain the safe operation of the boiler system.

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  • 32. 

    4-1   what auxiliaries does a hot water heating boiler have

    • A.

      Safety valve, gauge glass, pressure control and bottom boiler drain valve.

    • B.

      Safety valve, pressure control, aquastat, temperature pressure gauge and bottom blow off valve.

    • C.

      Safety relief valve, temperature presssure gauge, aquastat and compression expansion tank

    • D.

      Safety relief valve , pressure control, steam gauge and bhottom blow off valve

    Correct Answer
    C. Safety relief valve, temperature presssure gauge, aquastat and compression expansion tank
    Explanation
    The correct answer is safety relief valve, temperature pressure gauge, aquastat, and compression expansion tank. These components are commonly found in a hot water heating boiler. The safety relief valve is important for releasing excess pressure, the temperature pressure gauge helps monitor the temperature and pressure levels, the aquastat controls the temperature of the water, and the compression expansion tank helps accommodate the expansion of water as it heats up.

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  • 33. 

    6-1    what is a boiler called that furnishes hot water to be used externally to itself

    • A.

      Heat exchanger

    • B.

      Cast iron sectional pork cop boiler

    • C.

      Hot water supply boiler

    • D.

      Miniature boiler

    Correct Answer
    C. Hot water supply boiler
    Explanation
    A hot water supply boiler is a type of boiler that provides hot water to be used externally to itself. This means that the hot water produced by the boiler is intended to be used for purposes other than heating the boiler itself. Unlike a heat exchanger or a cast iron sectional pork cop boiler, a hot water supply boiler is specifically designed to supply hot water for external use. A miniature boiler, on the other hand, is a small-scale boiler typically used for low-pressure steam or hot water applications.

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  • 34. 

    7-2    what is the max   size   safety valve that may be installed on a low pressure boiler

    • A.

      4 1/2

    • B.

      3

    • C.

      2

    • D.

      1 1/2

    Correct Answer
    A. 4 1/2
    Explanation
    The maximum size safety valve that may be installed on a low pressure boiler is 4 1/2.

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  • 35. 

    8-2    if a deposit of carbon appears on the rear wall of the combustion chamber of a mechanical pressure   type oil burner, a good procedure is to

    • A.

      Enlarge the combustion chamber

    • B.

      Try a wider nozzle

    • C.

      Cut down the air supply

    • D.

      Change the brick in the rear wall

    Correct Answer
    B. Try a wider nozzle
    Explanation
    If a deposit of carbon appears on the rear wall of the combustion chamber of a mechanical pressure-type oil burner, a good procedure is to try a wider nozzle. This is because a wider nozzle will allow for a larger fuel flow rate, which can help achieve a more complete combustion. By increasing the amount of fuel being burned, the carbon deposits can be reduced or eliminated.

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  • 36. 

    9-2    the difference in pressure between two points that causes air and gases to flow is called

    • A.

      Combustion

    • B.

      Post purge

    • C.

      Draft

    • D.

      Firing cycle

    Correct Answer
    C. Draft
    Explanation
    The correct answer is draft. Draft refers to the difference in pressure between two points that causes air and gases to flow. It is commonly used in the context of ventilation systems or chimneys, where the draft helps to remove smoke, fumes, or other gases.

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  • 37. 

    10-2   the rapid burning of fuel and oxygen that results in the release of heat is called

    • A.

      Combustion

    • B.

      Atomization

    • C.

      Post purge

    • D.

      Heating valve

    Correct Answer
    A. Combustion
    Explanation
    Combustion refers to the rapid burning of fuel and oxygen that leads to the release of heat. It is a chemical reaction that occurs when fuel and oxygen combine in the presence of heat or an ignition source. During combustion, the fuel molecules break down and react with oxygen molecules, resulting in the production of carbon dioxide, water vapor, and heat energy. This process is commonly used in various applications, such as heating systems, engines, and power generation, to produce energy.

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  • 38. 

    11-2   the dial on a guage on a low pressure boiler should be graduated 

    • A.

      To the max allowable working pressure

    • B.

      Four times the max allowable working pressure

    • C.

      3 times the max allowable working pressure

    • D.

      One and one half to two times the max allowable working pressure

    Correct Answer
    D. One and one half to two times the max allowable working pressure
    Explanation
    The dial on a gauge on a low pressure boiler should be graduated one and one half to two times the max allowable working pressure. This means that the dial should have markings or divisions that cover a range from one and a half times the maximum allowable working pressure to two times the maximum allowable working pressure. This allows for better accuracy and visibility when monitoring the pressure levels in the boiler.

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  • 39. 

    12-2    no 2 fuel oil is a distillate with a heating value of approximately

    • A.

      141,000 btu's per gal

    • B.

      14000 btu per gal

    • C.

      1400000 btu per gal

    • D.

      940 btu per gal

    Correct Answer
    A. 141,000 btu's per gal
    Explanation
    No explanation is available.

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  • 40. 

    14-2    the valve that is installed when it is desirable to control the rate at which water flows is called a 

    • A.

      Stop and check valve

    • B.

      Globe valve

    • C.

      Safety valve

    • D.

      Gate valve

    Correct Answer
    B. Globe valve
    Explanation
    A globe valve is the correct answer because it is commonly used to control the rate at which water flows. It has a disc that moves up and down to regulate the flow of water, allowing for adjustments in the flow rate. This type of valve is often used in applications where precise control of flow is necessary, such as in water treatment plants or industrial processes.

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  • 41. 

    16-2   the bottom blowdown line on a steam boiler system is located at the 

    • A.

      Base of a steam trap to clean out the trap

    • B.

      Lowest point of the waterside of a steam boiler

    • C.

      Base of the fire box to put out the fire in case of emergency

    • D.

      base of the chimney to blow out a shimney fire

    Correct Answer
    B. Lowest point of the waterside of a steam boiler
    Explanation
    The correct answer is "lowest point of the waterside of a steam boiler." The bottom blowdown line is located at the lowest point of the waterside of a steam boiler to remove sediment and impurities that have settled at the bottom. This helps to maintain the efficiency and functionality of the boiler by preventing buildup and blockages in the system.

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  • 42. 

    17-2   in a steam boiler system , a possible water hammer is caused by

    • A.

      Carry over

    • B.

      a pulsating flame

    • C.

      a plugged gauge glass

    • D.

      A plugged water column

    Correct Answer
    A. Carry over
    Explanation
    In a steam boiler system, water hammer refers to the banging or knocking sound caused by the rapid condensation of steam. Carry over refers to the phenomenon where water droplets are carried along with the steam. If there is excessive carry over in the system, it can lead to water hammer. Therefore, carry over is a possible cause of water hammer in a steam boiler system.

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  • 43. 

    18-2   at about what temperature should the water be when applying a hydrostatic test on a boiler

    • A.

      32 deg F

    • B.

      70 deg F

    • C.

      120 deg F

    Correct Answer
    B. 70 deg F
    Explanation
    When applying a hydrostatic test on a boiler, the water should be at a temperature of around 70 degrees Fahrenheit. This is because the hydrostatic test is performed to check the integrity and strength of the boiler, and using water at this temperature ensures that the test is conducted under normal operating conditions. Water at this temperature provides a reliable baseline for evaluating the performance and safety of the boiler.

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  • 44. 

    19-2   a boiler weighs 1000 lbs empty. filling boiler with water to its normal  operating level requires 500 gal.. what is the total weight  of boiler and water

    • A.

      1500

    • B.

      5170

    • C.

      4150

    • D.

      1000

    Correct Answer
    B. 5170
    Explanation
    The correct answer is 5170. To find the total weight of the boiler and water, we need to add the weight of the empty boiler (1000 lbs) to the weight of the water (500 gal). Since the weight of water is approximately 8.34 lbs per gallon, the weight of the water is 500 gal * 8.34 lbs/gal = 4170 lbs. Adding this to the weight of the empty boiler, we get 1000 lbs + 4170 lbs = 5170 lbs.

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  • 45. 

    21-2       what does a flue gas analyzer measure

    • A.

      The percentages of volume of carbon dioxide, carbon monoxide and oxygen

    • B.

      The amount of smoke soot in the flue gases

    • C.

      The velocity of the flue gases

    • D.

      The temperature of the flue gases

    Correct Answer
    A. The percentages of volume of carbon dioxide, carbon monoxide and oxygen
    Explanation
    A flue gas analyzer is a device used to measure the percentages of volume of carbon dioxide, carbon monoxide, and oxygen in flue gases. This is important in determining the efficiency of combustion processes and the presence of harmful gases. It helps to ensure that the emissions from a combustion system are within acceptable limits and that the system is operating safely. By measuring these gases, the analyzer provides valuable information for optimizing combustion processes and reducing environmental impact.

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  • 46. 

    22  how many 360 deg turns from fully closed to fully open is required on a slow opening blowdown valve

    • A.

      2

    • B.

      3

    • C.

      4

    • D.

      5

    Correct Answer
    D. 5
    Explanation
    A slow opening blowdown valve requires 5 full 360-degree turns from fully closed to fully open. Each turn represents a 360-degree rotation, and since the valve is slow opening, it requires more turns to fully open compared to a fast opening valve. Therefore, the correct answer is 5.

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  • 47. 

    23-2     waht is the total force of steam acting on a low pressure 3 in.  safety valve using the formula  TF=A   X   P

    • A.

      3 lbs

    • B.

      15 lbs

    • C.

      45 lbs

    • D.

      106 lbs

    Correct Answer
    D. 106 lbs
  • 48. 

    25-2  what is used to ensure that all of the fuel is properly burned in a boiler, and thus attain a better efficiency in heat release

    • A.

      An extra large chimney

    • B.

      Excess air

    • C.

      A double insulated boiler

    • D.

      An induced draft fan in the breaching

    Correct Answer
    B. Excess air
    Explanation
    Excess air is used to ensure that all of the fuel is properly burned in a boiler, and thus attain a better efficiency in heat release. By introducing more air than is theoretically required for complete combustion, any unburned fuel or byproducts are given the opportunity to react and burn completely. This helps to maximize the efficiency of the combustion process and reduce the amount of pollutants emitted from the boiler.

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  • 49. 

    26-2    if a condensate pump becomes steambound and stops delivering water, what could be done to correct the problem

    • A.

      Close the suction line

    • B.

      Increase the water temperature

    • C.

      Increase head pressure

    • D.

      Increase the pump speed

    Correct Answer
    C. Increase head pressure
    Explanation
    Increasing the head pressure can help to correct the problem of a steambound condensate pump that has stopped delivering water. This is because increasing the head pressure will create a higher pressure differential between the pump inlet and outlet, which can help to overcome any steam blockage and allow the pump to resume delivering water. Closing the suction line, increasing the water temperature, or increasing the pump speed would not directly address the issue of steam blockage in the pump.

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  • 50. 

    27    in heating load calculations  what does the term EDR mean

    • A.

      Engineering design requirements

    • B.

      Equivalent square feet of direct radiation surface

    • C.

      Entire downdraft requirments

    • D.

      Enthalpy determination requirement

    Correct Answer
    B. Equivalent square feet of direct radiation surface
    Explanation
    In heating load calculations, the term EDR stands for "Equivalent Square Feet of Direct Radiation Surface". This term refers to the measurement used to determine the amount of heat that a heating system can deliver. It is a standardized unit that represents the surface area of a radiator or other heating element that can emit a certain amount of heat. By using EDR, engineers can accurately calculate the heating load requirements for a given space and select the appropriate heating system.

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