Boiler Exam Practice Quiz

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Boiler Quizzes & Trivia

Questions and Answers
  • 1. 

    1).    Which formula is used to determine the efficiecy of the boiler based on heat absorption?

    • A.

      A swp = ts xt x eff

    • B.

      b. output divided by the input

    • C.

      C. e=mc squared

    • D.

      D input divided by output

    Correct Answer
    B. b. output divided by the input
    Explanation
    The formula used to determine the efficiency of the boiler based on heat absorption is to divide the output by the input. This calculation allows us to compare the amount of useful heat energy produced by the boiler (output) to the amount of fuel or energy inputted into the boiler. By dividing the output by the input, we can determine how efficiently the boiler is converting the input energy into useful heat energy.

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  • 2. 

    2)How many ways can heat be transferred?

    • A.

      A 1

    • B.

      B 2

    • C.

      C 3

    • D.

      D 4

    Correct Answer
    C. C 3
    Explanation
    Heat can be transferred in three ways: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact, such as when a hot pan heats up the handle. Convection is the transfer of heat through the movement of fluids, such as when warm air rises and cool air sinks. Radiation is the transfer of heat through electromagnetic waves, such as when heat from the sun reaches the Earth. Therefore, there are three ways in which heat can be transferred.

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  • 3. 

    3)how man typed of heat ar there?

    • A.

      A 1

    • B.

      B 2

    • C.

      C 3

    • D.

      D 4

    Correct Answer
    C. C 3
    Explanation
    The correct answer is C, 3. This suggests that there are three types of heat. However, without any further context or information provided in the question, it is difficult to determine what these three types of heat might be. It is possible that the question is referring to conduction, convection, and radiation, which are the three main methods of heat transfer. However, since the question is incomplete and lacks clarity, it is challenging to provide a definitive explanation.

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  • 4. 

    4)how may different types of draft are there?

    • A.

      A 1

    • B.

      B 2

    • C.

      C 3

    • D.

      D 4

    Correct Answer
    C. C 3
    Explanation
    There are three different types of draft available.

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  • 5. 

    5)how may different types of boilers are there?

    • A.

      A 1

    • B.

      B 2

    • C.

      C 3

    • D.

      D 4

    Correct Answer
    C. C 3
    Explanation
    The correct answer is c) 3. This suggests that there are three different types of boilers. However, without further information, it is not possible to determine what these three types are.

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  • 6. 

    6)how many different types of low water fuel cut of are in general use?

    • A.

      A 1

    • B.

      B 2

    • C.

      C 3

    • D.

      D 4

    Correct Answer
    C. C 3
    Explanation
    There are three different types of low water fuel cut off in general use.

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  • 7. 

    7)how many different types of air are there? a)1  b2  c3  d4 

    • A.

      A 1

    • B.

      B 2

    • C.

      C 3

    • D.

      D 4

    Correct Answer
    C. C 3
    Explanation
    The question asks about the number of different types of air. The correct answer is "c) 3" which means that there are three different types of air.

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  • 8. 

    1)a (RPZ) reduced pressure zone or back flow preventer prevents contaninated water from entering the domestic water supply.           

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    A (RPZ) reduced pressure zone or backflow preventer is a device that is used to protect the domestic water supply from contamination. It works by creating a barrier between the potable water system and any potential sources of contamination. This prevents contaminated water from flowing back into the drinking water supply. Therefore, the statement that a (RPZ) reduced pressure zone or backflow preventer prevents contaminated water from entering the domestic water supply is true.

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  • 9. 

    2)Boilers and boiler fittings used in the state of Minnesota must be constructed to what code?

    • A.

      2)Boilers and boiler fittings used in the state of Minnesota must be constructed to what code? A N.E.C. B. A.S.M.E. C. City code d. N.F.P. A. A N.E.C

    • B.

      B. A.S.M.E.

    • C.

      C. City code

    • D.

      D. N.F.P. A

    Correct Answer
    B. B. A.S.M.E.
    Explanation
    Boilers and boiler fittings used in the state of Minnesota must be constructed to the A.S.M.E. code.

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  • 10. 

    3)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?  b. pressure taqua stat roll  c. vapor stat  d. flow control valve

    • A.

      A aqua stat

    • B.

      B pressure troll

    • C.

      c. vapor stat

    • D.

      D. flow control valve

    Correct Answer
    A. A aqua stat
    Explanation
    The unit that controls the starting and stopping of the burner by sensing the temperature of the water in a hot water boiler is called an aqua stat.

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  • 11. 

    4)heat cant be transferred in three ways and they are:

    • A.

      A.latent heat, specific heat, sensible heat

    • B.

      B.conduction , radiation, convection

    • C.

      C,. heat flow measured heat flow.

    Correct Answer
    B. B.conduction , radiation, convection
    Explanation
    The correct answer is b. conduction, radiation, convection. Heat can be transferred through these three methods. Conduction is the transfer of heat through direct contact between two objects or substances. Radiation is the transfer of heat through electromagnetic waves, such as from the sun. Convection is the transfer of heat through the movement of fluids or gases, such as hot air rising and cool air sinking. These three methods are the primary ways in which heat is transferred in various systems and processes.

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  • 12. 

    5)the first sequence in the series of automatic bgurner controls is:

    • A.

      A. ignition

    • B.

      B purging

    • C.

      C. to make up the gas switch

    • D.

      D startup on low fire

    Correct Answer
    B. B purging
    Explanation
    The correct answer is b) purging. Purging is the process of removing any accumulated gas or air from the burner before ignition. This ensures that the burner starts with a clean and safe environment, preventing any potential hazards. Once purging is complete, the ignition process can begin. The other options listed, such as ignition, making up the gas switch, and startup on low fire, are steps that occur after purging in the sequence of automatic burner controls.

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  • 13. 

    6)air that is mixed with the fuel at / or  in the burner is called:

    • A.

      A.secondary air

    • B.

      B. primary air

    • C.

      C excess air

    • D.

      D. mixable air

    Correct Answer
    B. B. primary air
    Explanation
    Primary air refers to the air that is mixed with the fuel at or in the burner. This air is essential for the combustion process as it provides the necessary oxygen for the fuel to burn. It is called primary air because it is the first air to come into contact with the fuel and plays a crucial role in determining the efficiency and effectiveness of the combustion process.

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  • 14. 

    7)can a low water condition occur in a hot water heating type boiler?

    • A.

      A no, because the boiler is completely filled with water.

    • B.

      B yes, for numerous reasons

    • C.

      c no , because there is water in the expansion tank

    Correct Answer
    B. B yes, for numerous reasons
    Explanation
    A low water condition can occur in a hot water heating type boiler due to various reasons such as a malfunctioning feedwater valve, a leak in the system, or insufficient water supply. When the water level drops below a certain point, it can lead to overheating of the boiler and potential damage. Therefore, it is important to monitor the water level and ensure proper functioning of the boiler to prevent a low water condition.

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  • 15. 

    8) other that a safety relief valve what other safety device should be installed on a hot water heating boiler? a.        city water fill valve  b  low water fuel cut off  c a feed water regulator.

    • A.

      A. city water fill valve

    • B.

      B low water fuel cut off

    • C.

      C a feed water regulator

    Correct Answer
    B. B low water fuel cut off
    Explanation
    A low water fuel cut off is a safety device that is installed on a hot water heating boiler to prevent damage or accidents caused by low water levels. When the water level in the boiler drops below a certain point, the low water fuel cut off automatically shuts off the fuel supply, preventing the boiler from operating without sufficient water. This helps to prevent overheating, explosions, and other potentially dangerous situations. The city water fill valve and feed water regulator are not specifically safety devices, but rather components that help to maintain the proper water level in the boiler.

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  • 16. 

    9) what is the internal resistance to the flow of fuel oil? a.flash point   b viscosity  c fire point   d pour point  

    • A.

      A.flash point

    • B.

      B viscosity

    • C.

      c fire point

    • D.

      d pour point

    Correct Answer
    B. B viscosity
    Explanation
    The correct answer is b viscosity. Viscosity refers to the resistance of a fluid, such as fuel oil, to flow. It is a measure of the thickness or stickiness of the fluid. A higher viscosity indicates a thicker fluid, which means it has a higher resistance to flow. Therefore, the internal resistance to the flow of fuel oil can be determined by its viscosity.

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  • 17. 

    10)each boiler in a battery (piped together sharing the same common header) must have:

    • A.

      A. two or more safety valves on each boiler

    • B.

      B a main steam stop

    • C.

      C a chimney and breeching to each boiler

    • D.

      D two or more types of fuel

    Correct Answer
    B. B a main steam stop
    Explanation
    Each boiler in a battery, which are piped together and share the same common header, must have a main steam stop. This is necessary in order to control the flow of steam and shut off the supply when needed. The main steam stop valve is an essential safety feature that allows for maintenance, repairs, and emergencies. It helps in preventing accidents and ensuring the safe operation of the boilers. Having a main steam stop valve also allows for better control and regulation of the steam supply to each boiler in the system.

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  • 18. 

    11)what removes air from a hot water boiler system?

    • A.

      A. a siphon device

    • B.

      b air control

    • C.

      C flow control

    • D.

      D. relief valve

    Correct Answer
    B. b air control
    Explanation
    An air control is responsible for removing air from a hot water boiler system. Air can enter the system during installation or through leaks, and it can cause problems such as reduced efficiency and noisy operation. The air control is designed to automatically release trapped air from the system, ensuring proper circulation of hot water and preventing air-related issues.

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  • 19. 

    12)when a hydrostatic test of a boiler exceeds the maximum allowable working pressure each safety  valve, if  left attached to the boiler, should:  

    • A.

      A.be held to its seat by screwing down the compressions spring

    • B.

      B have its valve disc held to its seat by means of testing clamp or” gag

    • C.

      C be set above the maximum allowable working pressure

    Correct Answer
    B. B have its valve disc held to its seat by means of testing clamp or” gag
    Explanation
    The correct answer is b because when a hydrostatic test of a boiler exceeds the maximum allowable working pressure, it is important to ensure that the safety valve remains closed to prevent any potential leaks or failures. By using a testing clamp or gag, the valve disc can be securely held to its seat, providing a reliable seal during the test. This helps to maintain the safety and integrity of the boiler system.

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  • 20. 

    13)why is a safety valve   sealed?

    • A.

      A to prevent damage to the safety valve

    • B.

      to prevent tampering with pressure and capacity

    • C.

      to allow for blow back

    • D.

      D to protect to spring

    Correct Answer
    B. to prevent tampering with pressure and capacity
    Explanation
    A safety valve is sealed to prevent tampering with pressure and capacity. By sealing the safety valve, it ensures that no one can adjust or manipulate the pressure or capacity settings, which could potentially lead to dangerous situations or damage to the valve. This helps to maintain the integrity and reliability of the safety valve, ensuring that it functions properly in case of an emergency.

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  • 21. 

    14)    oxygen in a boiler water can cause a  scale  b carry over  c corrosion   d priming

    • A.

      A scale

    • B.

      B carry over

    • C.

      C corrosion

    • D.

      D priming

    Correct Answer
    C. C corrosion
    Explanation
    Oxygen in boiler water can cause corrosion. Corrosion is the process of deterioration of a material due to chemical reactions with its environment. In the case of a boiler, the presence of oxygen can lead to the formation of rust and other corrosive compounds, which can damage the boiler and its components over time. This can result in leaks, reduced efficiency, and ultimately, the need for costly repairs or replacements. Therefore, the correct answer is c corrosion.

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  • 22. 

    15)In a steam boiler  system, the unit that turns the burner on and off based on steam spessure is the : a  aqustat  bpressure control  c potentiometer  d modulator control

    • A.

      A aqustat bpressure control

    • B.

      B pressure control

    • C.

      C potentiomete

    • D.

      D modulator control

    Correct Answer
    B. B pressure control
    Explanation
    The correct answer is b) pressure control. In a steam boiler system, the pressure control unit is responsible for turning the burner on and off based on the steam pressure. It ensures that the pressure within the boiler stays within the desired range by regulating the burner operation. This helps to maintain the safety and efficiency of the boiler system.

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  • 23. 

    16)If wate in the gauge glass is not visible because of failure of the feed water supply, what should be done?

    • A.

      A add water immediately through the manual fill line

    • B.

      B shut off the fuel to the burner and secure the boiler

    • C.

      C notify the boiler inspector but continue to run the boiler

    Correct Answer
    B. B shut off the fuel to the burner and secure the boiler
    Explanation
    In the given scenario, if the water in the gauge glass is not visible due to a failure in the feed water supply, it indicates that there is a potential risk of the boiler running dry. This can lead to overheating and damage to the boiler. Therefore, the correct course of action would be to shut off the fuel to the burner and secure the boiler to prevent any further damage or accidents. This will ensure the safety of the boiler and prevent any potential hazards.

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  • 24. 

    17) what two scales does a pressure control have? A 0 to 20 psi  and 0 to 1 si B  cut in pressure and differential pressure C 0 to 10 psi  and 0 to 20 psi D none of these

    • A.

      A 0 to 20 psi and 0 to 15 psi

    • B.

      B cut in pressure and differential pressure

    • C.

      C 0 to 10 psi and 0 to 20 ps

    • D.

      D none of these

    Correct Answer
    B. B cut in pressure and differential pressure
    Explanation
    A pressure control typically has two scales, one for cut-in pressure and the other for differential pressure. Cut-in pressure refers to the pressure at which the control turns on, while differential pressure refers to the difference between the cut-in pressure and the cut-out pressure. Therefore, option B is the correct answer as it correctly identifies the two scales of a pressure control.

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  • 25. 

    18)what is the minimum size bottom blowdown line used on a mini or miniature boiler?

    • A.

      A ¼ inch

    • B.

      B ½ inch

    • C.

      C ¾ inch

    • D.

      D 1 inch

    Correct Answer
    B. B ½ inch
    Explanation
    The minimum size bottom blowdown line used on a mini or miniature boiler is ½ inch. This size is sufficient to allow for the proper removal of sediment and impurities from the boiler. A smaller size may not provide adequate flow and could lead to clogging or ineffective blowdown. A larger size may result in excessive blowdown and waste of water and energy. Therefore, a ½ inch bottom blowdown line is the appropriate choice for a mini or miniature boiler.

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  • 26. 

    19) what is the minimum size drain required on a water colum? A 1 inch  b ¾ inch  c ¼ inch  d ½ inch

    • A.

      A 1 inch

    • B.

      B ¾ inch

    • C.

      c ¼ inch

    • D.

      d ½ inch

    Correct Answer
    B. B ¾ inch
    Explanation
    The minimum size drain required on a water column is ¾ inch. This means that in order for the drain to effectively remove water from the column, it needs to have a diameter of at least ¾ inch.

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  • 27. 

    20) what conditions are necessare to cause a furnace explosion? Atoo much aire b not enough air c accumulation of unburned fuel, oxygen and an igition source d to much fuel

    • A.

      A too much aire

    • B.

      B not enough air

    • C.

      C accumulation of unburned fuel, oxygen and an igition source 

    • D.

      D to much fuel

    Correct Answer
    C. C accumulation of unburned fuel, oxygen and an igition source 
    Explanation
    A furnace explosion can occur when there is an accumulation of unburned fuel, oxygen, and an ignition source. This means that there is a build-up of fuel that has not been burned, along with an adequate supply of oxygen and a source of ignition, such as a spark or flame. This combination creates a potentially explosive environment within the furnace.

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  • 28. 

    21) the low water cut out should be tested:

    • A.

      A daily

    • B.

      B weekly

    • C.

      C monthly

    • D.

      D once a year

    Correct Answer
    A. A daily
    Explanation
    The low water cut out should be tested daily to ensure its proper functioning. This is important because the low water cut out is designed to prevent damage to the system by shutting off the power when the water level in the system drops below a certain point. By testing it daily, any issues or malfunctions can be identified and addressed promptly, reducing the risk of damage or failure in the system.

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  • 29. 

    22) can high pressure safety valve be used on the sam boiler for low pressure?

    • A.

      A yes by changing the spring pressure

    • B.

      b cannot be used..

    • C.

      C only by tightening the spring pressure

    Correct Answer
    B. b cannot be used..
    Explanation
    High pressure safety valves are designed specifically for high pressure systems and are not suitable for low pressure applications. They are designed to release excess pressure in high pressure systems to prevent damage or failure. Using a high pressure safety valve on a low pressure boiler could result in improper functioning and potentially dangerous situations. Therefore, it is not recommended to use a high pressure safety valve on a low pressure boiler.

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  • 30. 

    23      gauge pressure plus 14.7 psi is called what? A atmospheric pressure B positive pressure C  absolute pressure D operating pressure

    • A.

      A atmospheric pressure

    • B.

      B positive pressure

    • C.

      C absolute pressure

    • D.

      D operating pressure

    Correct Answer
    C. C absolute pressure
    Explanation
    Absolute pressure is the total pressure exerted by a fluid, including both the atmospheric pressure and any additional pressure. In this case, the given gauge pressure is added to the standard atmospheric pressure of 14.7 psi to determine the absolute pressure. Therefore, the correct answer is C, absolute pressure.

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  • 31. 

    24       the unit that shuts off the burner in the event of low water is: a  feed water pump b  safety valve c  low water fuel cut out   d  operating contrb  safety valveol

    • A.

      A feed water pump

    • B.

      B safety valve

    • C.

      C low water fuel cut out

    • D.

      d operating control

    Correct Answer
    C. C low water fuel cut out
    Explanation
    The correct answer is c) low water fuel cut out. This unit is responsible for shutting off the burner if the water level in the system drops too low. It is a safety feature to prevent damage to the burner and ensure that there is enough water in the system for proper operation.

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  • 32. 

    25  the evaporation of 34.5 pounds of water per hour from and at a temperature of 212 f    is defined as:

    • A.

      A the latent heat of evaporation

    • B.

      B one boiler horsepower

    • C.

      C an evaporation

    Correct Answer
    B. B one boiler horsepower
    Explanation
    The correct answer is b) one boiler horsepower. The evaporation of 34.5 pounds of water per hour at a temperature of 212°F is defined as one boiler horsepower. This is a measurement used in the context of boilers and refers to the amount of steam that a boiler can produce in a given time period.

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  • 33. 

    26       when a safety valve opens and closes rapidly it is referred to as:   a  chattering b  popping c  blow back d  pressuring

    • A.

      A chattering

    • B.

      B popping

    • C.

      C blow back

    • D.

      D pressuring

    Correct Answer
    A. A chattering
    Explanation
    When a safety valve opens and closes rapidly, it is referred to as "chattering." This term is used to describe the rapid and repeated movement of the valve, which can occur when there is a fluctuation in pressure or when the valve is not functioning properly. Chattering can be a sign of a malfunctioning valve and can potentially lead to damage or failure if not addressed.

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  • 34. 

    26      furnace explosings are caused by a build up of combustible gases, or vapors in the combustion chamber, what is the term used to remedy this condition? A  clearing   B  modulating C  purging D huddling

    • A.

      A clearing

    • B.

      B modulating

    • C.

      C purging

    • D.

      D huddling

    Correct Answer
    C. C purging
  • 35. 

    In order form a fuel to burn it must be heated to:

    • A.

      A 212 f

    • B.

      B at least 1000 f

    • C.

      C its ignition temperture

    Correct Answer
    C. C its ignition temperture
    Explanation
    In order for a fuel to burn, it must reach its ignition temperature. This is the minimum temperature at which the fuel can sustain combustion. Once the fuel reaches this temperature, it reacts with oxygen in the air and undergoes a chemical reaction called combustion, releasing heat and light. Therefore, heating the fuel to its ignition temperature is necessary for it to burn.

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  • 36. 

    29      why is a pigtail or siphon required in steam pressure gauge lines? Ato prevent water hammer B  to protect the gauge from a high temperature C  to reduce the pressure

    • A.

      A to prevent water hamme

    • B.

      B to protect the gauge from a high temperature

    • C.

      C to reduce the pressure

    Correct Answer
    B. B to protect the gauge from a high temperature
    Explanation
    A pigtail or siphon is required in steam pressure gauge lines to protect the gauge from high temperatures. Steam can reach very high temperatures, and without a pigtail or siphon, the direct contact with the steam could damage the gauge or give inaccurate readings. The pigtail or siphon acts as a barrier, allowing the steam to cool before reaching the gauge, thus preventing any damage or inaccuracies caused by high temperatures.

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  • 37. 

    30     in a steam boiler system, what is the term used for replacing the water that has been lost by blowng down the boiler or through leaks in the system? A  make up water B  condensate C  feed replacement

    • A.

      A make up water

    • B.

      B condensate

    • C.

      C feed replacement

    Correct Answer
    A. A make up water
    Explanation
    In a steam boiler system, when water is lost due to blowing down the boiler or leaks in the system, the term used for replacing this lost water is "make up water". This refers to adding new water to the system to compensate for the water that has been lost. The other options, condensate and feed replacement, do not specifically refer to the act of replacing lost water in a steam boiler system.

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  • 38. 

    31       on a steam boiler system, why are bottom blow down valves installed at the lowest point of the waterside of boilers? A  to remove sludge and sediment B  to remove make up water C  to prevent corrosion

    • A.

      A to remove sludge and sediment

    • B.

      B to remove make up water

    • C.

      C to prevent corrosion

    Correct Answer
    A. A to remove sludge and sediment
    Explanation
    Bottom blow down valves are installed at the lowest point of the waterside of boilers to remove sludge and sediment. Sludge and sediment can accumulate at the bottom of the boiler over time, which can negatively impact the efficiency and performance of the system. By installing bottom blow down valves at the lowest point, these impurities can be flushed out of the system, ensuring that the boiler operates at optimal levels. This helps to maintain the longevity and effectiveness of the boiler system.

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  • 39. 

    32       heating surface is defined as:

    • A.

      A a hot surface

    • B.

      B the surface used for heating

    • C.

      C water on one side hot gas on the other side.

    Correct Answer
    C. C water on one side hot gas on the other side.
    Explanation
    The correct answer is c because heating surface refers to a surface that separates water and hot gas in a heat exchanger. This surface allows heat transfer from the hot gas to the water, resulting in the heating of the water.

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  • 40. 

    33      if a steam trap on a radiator of a steam heating system becomes water logged, what will happen?

    • A.

      A the radiator will overheat

    • B.

      B the radiator will not heat the room properly

    • C.

      C the steam trap will leak

    Correct Answer
    B. B the radiator will not heat the room properly
    Explanation
    If a steam trap on a radiator of a steam heating system becomes water logged, it means that the trap is not functioning properly and is unable to remove condensate from the system effectively. As a result, the radiator will not receive sufficient steam and will not be able to heat the room properly.

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  • 41. 

    34      in a fire tube boiler, the water

    • A.

      A surrounds the tubes

    • B.

      B is inside the tubes

    • C.

      C both inside and outside of the tubes

    Correct Answer
    A. A surrounds the tubes
    Explanation
    In a fire tube boiler, the water surrounds the tubes. This means that the water is located on the outside of the tubes while the hot gases produced by the combustion process flow inside the tubes. The heat from the gases is transferred to the water through the tube walls, resulting in the generation of steam. This design allows for efficient heat transfer and is commonly used in smaller, low-pressure boilers.

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  • 42. 

    35what chemical is used as an oxygen scavenger? A   sodium sulfite B   sodium hydroxide C   sodium nitrite

    • A.

      A sodium sulfite

    • B.

      B sodium hydroxide

    • C.

      C sodium nitrite

    Correct Answer
    A. A sodium sulfite
    Explanation
    Sodium sulfite is used as an oxygen scavenger. Oxygen scavengers are substances that react with and remove oxygen from a system, preventing oxidation and corrosion. Sodium sulfite is commonly used in water treatment systems and in the food industry to remove dissolved oxygen from water or food products. It works by undergoing a chemical reaction with oxygen, converting it into harmless compounds. Sodium hydroxide and sodium nitrite are not typically used as oxygen scavengers.

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  • 43. 

    36when tow bottom blow down valves are used on a steam boiler, what valve is located closes to the boiler shell? A   the quick opening valve B  the slow opening valve C   modulating

    • A.

      A the quick opening valve

    • B.

      B the slow opening valve

    • C.

      C modulating

    Correct Answer
    A. A the quick opening valve
    Explanation
    When two bottom blow down valves are used on a steam boiler, the valve located closest to the boiler shell is the quick opening valve. This valve is designed to open quickly and fully, allowing for a rapid release of pressure and discharge of water and sediments from the boiler. It is important to have a quick opening valve in this location to ensure efficient and effective blow down operations.

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  • 44. 

    38      purpose of a safety valve on a steam boiler is to

    • A.

      A regulate or control an even amount of steam pressure

    • B.

      B regulate the blow back

    • C.

      C prevent the pressure in a steam boiler from exceeding its maximum allowable working pressure.

    Correct Answer
    C. 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 and potential damage to the boiler. The safety valve acts as a safeguard by releasing excess pressure and maintaining a safe operating pressure level.

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  • 45. 

    39   the control designed as a safety back up , should the pressure control fail is:

    • A.

      A a sail switch

    • B.

      B a high limit control

    • C.

      C a modulating control

    • D.

      D an end switch

    Correct Answer
    B. B a high limit control
    Explanation
    A high limit control is designed to act as a safety backup in case the pressure control fails. It is responsible for shutting off the system if the pressure exceeds a predetermined limit, preventing any potential damage or hazards. This control ensures that the pressure does not reach dangerous levels and provides an additional layer of protection for the system.

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  • 46. 

    40     the capacity of a safety valve used on a steam boiler is measured in:” a  pounds of steam shown on the steam gauge b   pounds of steam that can be discharged in one hour c    pound of steam increased per min

    • A.

      A pounds of steam shown on the steam gauge

    • B.

      B pounds of steam that can be discharged in one hour

    • C.

      C pound of steam increased per min

    Correct Answer
    B. B pounds of steam that can be discharged in one hour
    Explanation
    The capacity of a safety valve used on a steam boiler is measured in pounds of steam that can be discharged in one hour. This means that the safety valve is designed to release a certain amount of steam within a specific time frame to prevent pressure build-up in the boiler. This measurement is important for ensuring that the safety valve can handle the maximum steam flow rate and prevent any potential accidents or damage to the boiler.

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  • 47. 

    41      how does a pressure control attached to the steam space of a boiler control the burner operation?

    • A.

      A burner starts on pressure decreased stop on pressure increase

    • B.

      B burner starts on pressure increase stop on pressure decrease

    • C.

      starts burner on pressure increaseA burner starts on pressure decreased stop on pressure increase

    • D.

      D stops burner on pressure

    Correct Answer
    A. A burner starts on pressure decreased stop on pressure increase
    Explanation
    The correct answer is A. A pressure control attached to the steam space of a boiler controls the burner operation by starting the burner when the pressure decreases and stopping it when the pressure increases. This ensures that the burner operates when the pressure drops below a certain level and stops when the pressure rises above another set level. This control mechanism helps maintain the desired pressure range in the boiler.

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  • 48. 

    42      when could stop valves be eliminated for a single hot water heating boiler?

    • A.

      42 when coud stop valves be eliminated for a single hot water heating boiler? A when the pressure is less then 30 psi B when the boiler is located above the system C when the pressure is less then 15 psi A when the pressure is less then 30 ps

    • B.

      B when the boiler is located above the system

    • C.

      C when the pressure is less then 15 psi

    Correct Answer
    B. B when the boiler is located above the system
    Explanation
    Stop valves can be eliminated for a single hot water heating boiler when the boiler is located above the system. This is because the natural flow of hot water will allow the boiler to fill and circulate without the need for stop valves.

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  • 49. 

    43      in some heating systems the circulation pump is controlled by the?

    • A.

      A water pressure

    • B.

      B thermostat

    • C.

      C water head pressure

    Correct Answer
    B. B thermostat
    Explanation
    In some heating systems, the circulation pump is controlled by the thermostat. The thermostat is responsible for monitoring the temperature in the system and turning the pump on or off based on the desired temperature set by the user. When the temperature falls below the set point, the thermostat signals the pump to start circulating hot water to heat the space. Once the desired temperature is reached, the thermostat signals the pump to stop circulating water. Therefore, the thermostat plays a crucial role in controlling the operation of the circulation pump in heating systems.

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  • 50. 

    44    what action should an operating engineer take if a defect is discovered in a boiler requiring repairs not of a routine nature? t

    • A.

      A notify the boiler inspector

    • B.

      B notify the sheriff

    • C.

      C notify another engineer in the plant

    Correct Answer
    A. A notify the boiler inspector
    Explanation
    If a defect is discovered in a boiler requiring repairs not of a routine nature, the operating engineer should notify the boiler inspector. This is because the boiler inspector is responsible for ensuring the safety and compliance of boilers. By notifying the boiler inspector, they can assess the defect and determine the appropriate course of action to address the issue and ensure the boiler is repaired properly.

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