Boiler Exam 1c Minnesota: Quiz!

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Boiler Exam 1c Minnesota: Quiz! - Quiz

Not just anyone can operate a boiler without proper training. The boiler exam 1C below from the Minnesota state is designed to see how qualified you are to operate a boiler. Give it a shot and see just how much you know. Give it a shot and keep reading up for the exam.


Questions and Answers
  • 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 "output divided by the input". This formula calculates the ratio of the useful output energy (such as heat or work) generated by the boiler to the input energy (such as fuel or electricity) supplied to the boiler. By dividing the output by the input, we can determine how effectively the boiler is converting the input energy into useful output energy, which indicates its efficiency.

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  • 2. 

    How many ways can heat be transferred? 

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    C. 3
    Explanation
    Heat can be transferred in three ways: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between objects or substances. Convection is the transfer of heat through the movement of fluids or gases. Radiation is the transfer of heat through electromagnetic waves. These three methods are the fundamental ways in which heat is transferred from one object to another.

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  • 3. 

    How many types of heat transfer are there?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    C. 3
    Explanation
    There are three types of heat: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between objects or substances. Convection is the transfer of heat through the movement of fluids or gases. Radiation is the transfer of heat through electromagnetic waves.

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  • 4. 

    How many different types of drafts be there?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    C. 3
    Explanation
    There can be three different types of drafts.

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  • 5. 

    How many types of boilers are there?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    B. 2
    Explanation
    Boilers, diverse in types, can be broadly classified into two categories: water boilers and steam boilers. Water boilers are designed to heat water, generating hot water for heating and/or domestic use.

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  • 6. 

    How many different types of low water fuel cut are in general use?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    B. 2
    Explanation
    There are two different types of low water fuel cut in general use. The low water cut-off stands out as a paramount safety feature in boilers. Present in both steam and hot water boilers, it plays a vital role in ensuring safety by monitoring and responding to decreases in water levels. These cut-offs can be either mechanical, using a float-type mechanism, or electrical, employing probe-type devices.

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  • 7. 

    How many different types of air are there?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    C. 3
    Explanation
    Generally, there are three main types:
    Primary Air: This is the air supplied to a combustion chamber to support the burning of fuel.
    Secondary Air: This is additional air supplied to the combustion process, usually above the fuel bed, to ensure complete combustion.
    Tertiary Air: In some combustion systems, a third stream of air, known as tertiary air, may be introduced to further optimize combustion efficiency and reduce emissions.
    These classifications are important for understanding and managing combustion processes in boilers and other combustion equipment.

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  • 8. 

    A (RPZ) reduced pressure zone or backflow preventer prevents contaminated water from entering the domestic water supply.           

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    A reduced pressure zone or backflow preventer is designed to prevent contaminated water from flowing back into the domestic water supply. This device creates a physical barrier that prevents the reverse flow of water, ensuring that any potential contaminants or pollutants cannot enter the clean water supply. Therefore, the statement "A (RPZ) reduced pressure zone or backflow preventer prevents contaminated water from entering the domestic water supply" is true.

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  • 9. 

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

    • A.

      A N.E.C.

    • B.

      A.S.M.E.

    • C.

      City code

    • D.

      N.F.P. A

    Correct Answer
    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. This code, established by the American Society of Mechanical Engineers, sets the standards for the design, construction, and operation of boilers and pressure vessels. Adhering to this code ensures that the boilers and fittings meet safety requirements and operate efficiently.

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  • 10. 

    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.

      Aqua stat

    • B.

      Pressure troll

    • C.

      Vapor stat

    • D.

      Flow control valve

    Correct Answer
    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. It is responsible for maintaining the desired temperature by activating the burner when the water temperature falls below a certain set point and shutting it off when the temperature reaches the desired level.

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  • 11. 

    Heat can be transferred in three ways and they are:

    • A.

      Latent heat, specific heat, sensible heat

    • B.

      Conduction , radiation, convection

    • C.

      Heat flow measured heat flow.

    Correct Answer
    B. Conduction , radiation, convection
    Explanation
    The correct answer is conduction, radiation, and convection. These are the three ways in which heat can be transferred. 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, such as air or water. These three mechanisms play a crucial role in the transfer of heat and are commonly observed in various everyday situations.

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  • 12. 

    The first sequence in the series of automatic bgurner controls is:

    • A.

      Ignition

    • B.

      Purging

    • C.

      To make up the gas switch

    • D.

      Startup on low fire

    Correct Answer
    B. Purging
    Explanation
    The correct answer is purging. In the sequence of automatic burner controls, purging is the first step. Purging refers to the process of removing any residual gas or air from the combustion chamber before ignition. This is done to ensure a safe and efficient start-up of the burner. Once purging is completed, the ignition process can take place, followed by making up the gas switch and starting up on low fire.

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  • 13. 

    Air that is mixed with the fuel at / or  in the burner is called: 

    • A.

      Secondary air

    • B.

      Primary air

    • C.

      Excess air

    • D.

      Mixable air

    Correct Answer
    B. Primary air
    Explanation
    Primary air refers to the air that is mixed with the fuel at or in the burner. It is the initial air that is supplied to support the combustion process. This air is essential for providing the necessary oxygen for the fuel to burn efficiently. Primary air is typically controlled and adjusted to achieve the desired fuel-air ratio for optimal combustion.

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  • 14. 

    Can a low water condition occur in a hot water heating type boiler? 

    • A.

      No, because the boiler is completely filled with water.

    • B.

      Yes, for numerous reasons

    • C.

      No , because there is water in the expansion tank

    Correct Answer
    B. Yes, for numerous reasons
    Explanation
    A low water condition can occur in a hot water heating type boiler for numerous reasons. Despite the boiler being filled with water, various factors such as leaks, improper water level control, or malfunctioning components can lead to a decrease in water level. This can result in inadequate heat transfer and potentially cause damage to the boiler.

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  • 15. 

    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.

      City water fill valve

    • B.

      Low water fuel cut off

    • C.

      A feed water regulator

    Correct Answer
    B. Low water fuel cut off
    Explanation
    A low water fuel cut off is a safety device that should be installed on a hot water heating boiler. It is designed to shut off the fuel supply to the boiler if the water level drops below a certain point. This helps to prevent the boiler from overheating and potentially causing a dangerous situation. The low water fuel cut off helps to ensure that there is always enough water in the boiler to properly transfer heat and prevent damage to the system.

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  • 16. 

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

    • A.

      Flash point

    • B.

      Viscosity

    • C.

      Fire point

    • D.

      Pour point

    Correct Answer
    B. Viscosity
    Explanation
    The correct answer is viscosity. Viscosity refers to the internal resistance to the flow of a fluid, in this case, fuel oil. It measures the thickness or stickiness of the oil, which affects how easily it can flow through pipes and machinery. A higher viscosity indicates a thicker oil that will flow more slowly, while a lower viscosity indicates a thinner oil that will flow more easily. Therefore, the internal resistance to the flow of fuel oil is determined by its viscosity.

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  • 17. 

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

    • A.

      Two or more safety valves on each boiler

    • B.

      A main steam stop

    • C.

      A chimney and breeching to each boiler

    • D.

      Two or more types of fuel

    Correct Answer
    B. A main steam stop
    Explanation
    A main steam stop is necessary for each boiler in a battery because it allows for the control and regulation of steam flow. This stop valve is crucial for shutting off the flow of steam in case of emergencies or maintenance.

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  • 18. 

    What removes air from a hot water boiler system? 

    • A.

      A siphon device

    • B.

      Air control

    • C.

      Flow control

    • D.

      Relief valve

    Correct Answer
    B. Air control
    Explanation
    An air control is a device that removes air from a hot water boiler system. When air enters the system, it can cause inefficiencies and decrease the system's performance. The air control is designed to automatically release trapped air from the system, ensuring that the water circulates properly and efficiently. By removing the air, the air control helps to prevent issues such as airlocks, noise, and reduced heat transfer.

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  • 19. 

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

    • A.

      Be held to its seat by screwing down the compressions spring

    • B.

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

    • C.

      Be set above the maximum allowable working pressure

    Correct Answer
    B. Have its valve disc held to its seat by means of testing clamp or” gag
    Explanation
    When a hydrostatic test of a boiler exceeds the maximum allowable working pressure, each safety valve should have its valve disc held to its seat by means of a testing clamp or "gag". This is done to ensure that the safety valve remains closed and does not release any pressure during the test. By holding the valve disc to its seat, the safety valve can be tested for its ability to hold pressure without the risk of it opening prematurely. This ensures the safety and integrity of the boiler during the test.

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  • 20. 

    Why is a safety valve   sealed? 

    • A.

      To prevent damage to the safety valve

    • B.

      To prevent tampering with pressure and capacity

    • C.

      To allow for blow back

    • D.

      To protect to spring

    Correct Answer
    B. To prevent tampering with pressure and capacity
    Explanation
    The safety valve is sealed to prevent tampering with pressure and capacity. By sealing the 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 system. This helps maintain the safety and integrity of the valve, ensuring that it functions properly when it is needed to relieve excess pressure and protect the system.

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  • 21. 

    Oxygen in a boiler water can causea  scale  b carry over  c corrosion   d priming

    • A.

      Scale

    • B.

      Carry over

    • C.

      Corrosion

    • D.

      Priming

    Correct Answer
    C. Corrosion
    Explanation
    Oxygen in boiler water can cause corrosion. When oxygen is present in the water, it can react with the metal surfaces inside the boiler, leading to the formation of rust and corrosion. This can weaken the metal and lead to structural damage or failure of the boiler system. Corrosion can also result in the formation of scale deposits, which can further impede the efficiency and performance of the boiler. Therefore, it is important to remove or minimize the presence of oxygen in boiler water to prevent corrosion.

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  • 22. 

    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.

      Aqustat bpressure control

    • B.

      Pressure control

    • C.

      Potentiomete

    • D.

      Modulator control

    Correct Answer
    B. Pressure control
    Explanation
    The correct answer is 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 steam pressure stays within the desired range by activating the burner when the pressure drops below the set point and deactivating it when the pressure exceeds the set point. This helps to maintain a consistent and safe operating pressure in the boiler system.

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  • 23. 

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

    • A.

      Add water immediately through the manual fill line

    • B.

      Shut off the fuel to the burner and secure the boiler

    • C.

      Notify the boiler inspector but continue to run the boiler

    Correct Answer
    B. Shut off the fuel to the burner and secure the boiler
    Explanation
    In this situation, if the water in the gauge glass is not visible due to a failure of the feed water supply, it indicates a potential issue with the boiler. To prevent any further damage or accidents, the correct action would be to shut off the fuel to the burner and secure the boiler. This will help to prevent any potential hazards and ensure the safety of the boiler and surrounding area.

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  • 24. 

    What two scales does a pressure control have?A 0 to 20 psi  and 0 to 1 siB  cut in pressure and differential pressureC 0 to 10 psi  and 0 to 20 psiD none of these

    • A.

      0 to 20 psi and 0 to 15 psi

    • B.

      Cut in pressure and differential pressure

    • C.

      0 to 10 psi and 0 to 20 ps

    • D.

      None of these

    Correct Answer
    B. Cut in pressure and differential pressure
  • 25. 

    What is the minimum size bottom blowdown line used on a mini or miniature boiler? 

    • A.

      ¼ inch

    • B.

      ½ inch

    • C.

      ¾ inch

    • D.

      1 inch

    Correct Answer
    B. ½ inch
    Explanation
    The minimum size bottom blowdown line used on a mini or miniature boiler is ½ inch. This size is determined based on the requirements of the boiler and the amount of blowdown that needs to be discharged. A smaller size would not be sufficient to handle the flow of blowdown, while a larger size would be unnecessary and potentially wasteful. Therefore, a ½ inch bottom blowdown line is the appropriate choice for a mini or miniature boiler.

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  • 26. 

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

    • A.

      1 inch

    • B.

      ¾ inch

    • C.

      ¼ inch

    • D.

      ½ inch

    Correct Answer
    B. ¾ inch
    Explanation
    The minimum size drain required on a water column is ¾ inch. This means that the drain should have a diameter of at least ¾ inch in order to effectively drain the water column. A drain of this size will ensure that the water can flow out smoothly and prevent any potential clogging or blockages.

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  • 27. 

    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.

      Too much aire

    • B.

      Not enough air

    • C.

      Accumulation of unburned fuel, oxygen and an igition source 

    • D.

      To much fuel

    Correct Answer
    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 combination creates a potentially explosive environment where the fuel and oxygen can rapidly combust when ignited. The presence of too much or not enough air may affect the efficiency of combustion, but it is not the primary cause of a furnace explosion. Similarly, having too much fuel alone is not enough to cause an explosion without the presence of unburned fuel, oxygen, and an ignition source.

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  • 28. 

    The low water cut out should be tested:  

    • A.

      Daily

    • B.

      Weekly

    • C.

      Monthly

    • D.

      Once a year

    Correct Answer
    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 responsible for shutting off the equipment when the water level drops below a safe level. Regular testing helps to identify any issues or malfunctions early on, preventing potential damage to the equipment and ensuring the safety of the system.

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  • 29. 

    Can high pressure safety valve be used on the sam boiler for low pressure? 

    • A.

      Yes by changing the spring pressure

    • B.

      Cannot be used..

    • C.

      Only by tightening the spring pressure

    Correct Answer
    B. Cannot be used..
    Explanation
    A high pressure safety valve is specifically designed to release excess pressure in a high pressure system. It is not suitable for use in a low pressure system because it may not open at the desired pressure and may not provide adequate protection. Tightening the spring pressure may not be sufficient to convert it into a low pressure safety valve. Therefore, a high pressure safety valve cannot be used on the same boiler for low pressure.

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  • 30. 

    Gauge pressure plus 14.7 psi is called what?A atmospheric pressureB positive pressureC  absolute pressureD operating pressure

    • A.

      Atmospheric pressure

    • B.

      Positive pressure

    • C.

      Absolute pressure

    • D.

      Operating 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 it gives the absolute pressure. Positive pressure refers to any pressure above atmospheric pressure, but it does not specifically refer to the sum of gauge pressure and atmospheric pressure. Operating pressure is a general term that can refer to any pressure used in a specific operation or system. Therefore, the correct answer is absolute pressure.

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  • 31. 

    The unit that shuts off the burner in the event of low water is:a  feed water pumpb  safety valvec  low water fuel cut out  d  operating contrb  safety valveol

    • A.

      Feed water pump

    • B.

      Safety valve

    • C.

      Low water fuel cut out

    • D.

      Operating control

    Correct Answer
    C. Low water fuel cut out
    Explanation
    The correct answer is "low water fuel cut out". This unit is responsible for shutting off the burner in the event of low water in the system. It is designed to prevent damage to the burner and ensure safety by cutting off the fuel supply when the water level drops below a certain threshold. The feed water pump is responsible for supplying water to the boiler, the safety valve is designed to release excess pressure, and the operating control helps regulate the overall operation of the system.

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  • 32. 

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

    • A.

      The latent heat of evaporation

    • B.

      One boiler horsepower

    • C.

      An evaporation

    Correct Answer
    B. One boiler horsepower
    Explanation
    One boiler horsepower is defined as the amount of heat energy required to evaporate 34.5 pounds of water per hour from and at a temperature of 212°F.

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  • 33. 

    When a safety valve opens and closes rapidly it is referred to as: a  chatteringb  poppingc  blow backd  pressuring

    • A.

      Chattering

    • B.

      Popping

    • C.

      Blow back

    • D.

      Pressuring

    Correct Answer
    A. Chattering
    Explanation
    Chattering is the correct answer because when a safety valve opens and closes rapidly, it creates a chattering sound. This can occur due to excessive pressure fluctuations or improper valve settings. Chattering can be detrimental as it can cause wear and tear on the valve, leading to potential failure.

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  • 34. 

    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  clearingB  modulatingC  purgingD huddling

    • A.

      Clearing

    • B.

      Modulating

    • C.

      Purging

    • D.

      Huddling

    Correct Answer
    C. Purging
    Explanation
    When a furnace experiences a build-up of combustible gases or vapors in the combustion chamber, the term used to remedy this condition is "purging." Purging involves the process of removing or flushing out the accumulated gases or vapors from the combustion chamber before igniting the furnace. This is done to ensure that any potential explosion risk is minimized and the furnace operates safely.

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  • 35. 

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

    • A.

      212 f

    • B.

      At least 1000 f

    • C.

      Its ignition temperture

    Correct Answer
    C. Its ignition temperture
    Explanation
    In order for a fuel to burn, it must be heated to its ignition temperature. This is the minimum temperature at which the fuel can ignite and sustain a combustion reaction. Therefore, heating the fuel to any temperature below its ignition temperature will not result in burning.

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  • 36. 

    Why is a pigtail or siphon required in steam pressure gauge lines?Ato prevent water hammerB  to protect the gauge from a high temperatureC  to reduce the pressure

    • A.

      To prevent water hamme

    • B.

      To protect the gauge from a high temperature

    • C.

      To reduce the pressure

    Correct Answer
    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 a high temperature. Steam is at a high temperature and can cause damage to the gauge if it directly comes in contact with it. The pigtail or siphon acts as a barrier, allowing the steam to condense and cool before reaching the gauge, thus protecting it from the high temperature.

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  • 37. 

    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 waterB  condensateC  feed replacement

    • A.

      Make up water

    • B.

      Condensate

    • C.

      Feed replacement

    Correct Answer
    A. Make up water
    Explanation
    Make up water refers to the water that is added to a steam boiler system to replace the water that has been lost due to blowing down the boiler or through leaks in the system. This is necessary to maintain the desired water level and ensure proper functioning of the boiler. Condensate, on the other hand, refers to the water that is formed when steam condenses, and feed replacement is not a commonly used term in this context.

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  • 38. 

    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 sedimentB  to remove make up waterC  to prevent corrosion

    • A.

      To remove sludge and sediment

    • B.

      To remove make up water

    • C.

      To prevent corrosion

    Correct Answer
    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. Over time, sludge and sediment can accumulate in the boiler, which can negatively affect its efficiency and performance. By installing bottom blow down valves at the lowest point, these impurities can be easily drained out of the system, preventing any potential damage or blockages. Regular removal of sludge and sediment helps maintain the boiler's functionality and prolong its lifespan.

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  • 39. 

    Heating surface is defined as: 

    • A.

      A hot surface

    • B.

      The surface used for heating

    • C.

      Water on one side hot gas on the other side.

    Correct Answer
    C. Water on one side hot gas on the other side.
    Explanation
    The correct answer is "water on one side hot gas on the other side." This definition refers to the concept of a heating surface, which is a surface that separates water and hot gas in a heat exchanger. The heat from the hot gas is transferred to the water through this surface, resulting in the heating of the water.

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  • 40. 

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

    • A.

      The radiator will overheat

    • B.

      The radiator will not heat the room properly

    • C.

      The steam trap will leak

    Correct Answer
    B. The radiator will not heat the room properly
    Explanation
    If a steam trap on a radiator of a steam heating system becomes waterlogged, it means that the trap is unable to effectively remove condensate from the radiator. This can result in reduced or blocked steam flow to the radiator, causing it to not heat the room properly. The waterlogged trap prevents the proper functioning of the radiator, leading to inadequate heating of the room.

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  • 41. 

    In a fire tube boiler, the water 

    • A.

      Surrounds the tubes

    • B.

      Is inside the tubes

    • C.

      Both inside and outside of the tubes

    Correct Answer
    A. Surrounds the tubes
    Explanation
    In a fire tube boiler, the water surrounds the tubes. This means that the tubes are immersed in the water, and the heat from the combustion gases passes through the walls of the tubes to heat the water. This design allows for efficient heat transfer and is commonly used in smaller, low-pressure boilers.

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  • 42. 

    What chemical is used as an oxygen scavenger?A   sodium sulfiteB   sodium hydroxideC   sodium nitrite

    • A.

      Sodium sulfite

    • B.

      Sodium hydroxide

    • C.

      Sodium nitrite

    Correct Answer
    A. Sodium sulfite
    Explanation
    Sodium sulfite is used as an oxygen scavenger. It reacts with oxygen to form sodium sulfate, which helps to remove oxygen from the environment. This is commonly used in industries such as food packaging and water treatment to prevent oxidation and preserve the quality of products. Sodium hydroxide and sodium nitrite are not typically used as oxygen scavengers.

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  • 43. 

    What is the primary purpose of boiler blowdown in steam boilers?

    • A.

      To avoid concentration of impurities during the evaporation of steam

    • B.

      To increase the steam pressure within the boiler 

    • C.

      To adjust the water level in the boiler 

    • D.

      To cool down the boiler

    Correct Answer
    A. To avoid concentration of impurities during the evaporation of steam
    Explanation
    Boiler blowdown is a process where water is intentionally wasted from a boiler. This is done to avoid the concentration of impurities that occurs during the continuous evaporation of steam. If not removed, these impurities can lead to significant problems such as scale and corrosion.

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  • 44. 

    Purpose of a safety valve on a steam boiler is to 

    • A.

      Regulate or control an even amount of steam pressure

    • B.

      Regulate the blow back

    • C.

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

    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 from exceeding its maximum allowable working pressure. This is crucial to ensure the safety of the boiler and prevent any potential damage or accidents that could occur if the pressure were to exceed safe limits. By automatically releasing excess pressure, the safety valve helps to maintain a safe and controlled operating environment for the steam boiler.

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  • 45. 

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

    • A.

      A modulating control

    • B.

      An end switch

    • C.

      A sail switch

    • D.

      A high limit control

    Correct Answer
    D. 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 monitoring and controlling the temperature or pressure of a system, and if it exceeds a certain preset limit, it will shut down the system to prevent any potential damage or hazards. This ensures that the system operates within safe limits and protects against any potential failures or malfunctions.

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  • 46. 

    The capacity of a safety valve used on a steam boiler is measured in:”a  pounds of steam shown on the steam gaugeb   pounds of steam that can be discharged in one hourc    pound of steam increased per min

    • 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

    Correct Answer
    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 per hour in order to prevent the pressure in the boiler from exceeding safe limits. By measuring the capacity in terms of pounds of steam discharged in one hour, it allows for an accurate assessment of the safety valve's ability to handle the steam flow and maintain a safe operating pressure.

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  • 47. 

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

    • A.

      Burner starts on pressure decreased stop on pressure increase

    • 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.

      Stops burner on pressure

    Correct Answer
    A. Burner starts on pressure decreased stop on pressure increase
    Explanation
    The pressure control attached to the steam space of a boiler is responsible for regulating the burner operation. When the pressure decreases below a certain set point, the control initiates the burner to start, ensuring that the pressure is maintained within the desired range. On the other hand, when the pressure increases above the set point, the control signals the burner to stop, preventing the pressure from exceeding the safe limit. This control mechanism helps maintain the desired pressure level in the boiler and ensures safe and efficient operation.

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  • 48. 

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

    • A.

      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.

      When the boiler is located above the system

    • C.

      When the pressure is less then 15 psi

    Correct Answer
    B. When the boiler is located above the system
    Explanation
    Stop valves are typically used in hot water heating systems to control the flow of water. However, if the boiler is located above the system, gravity can be used to circulate the hot water without the need for stop valves. In this case, the pressure differential created by the elevated boiler is sufficient to circulate the water through the system. Therefore, stop valves can be eliminated in this scenario.

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  • 49. 

    In some heating systems the circulation pump is controlled by the? 

    • A.

      Water pressure

    • B.

      Thermostat

    • C.

      Water head pressure

    Correct Answer
    B. Thermostat
    Explanation
    The circulation pump in some heating systems is controlled by the thermostat. The thermostat is responsible for monitoring the temperature in the system and signaling the pump to circulate the water when the desired temperature is not reached. This ensures that the heating system operates efficiently by only activating the pump when necessary, based on the temperature settings determined by the thermostat.

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  • 50. 

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

    • A.

      Notify the boiler inspector

    • B.

      Notify the sheriff

    • C.

      Notify another engineer in the plant

    Correct Answer
    A. Notify the boiler inspector
    Explanation
    If a defect is discovered in a boiler requiring repairs that are not of a routine nature, the appropriate action for an operating engineer to take would be to notify the boiler inspector. This is because the boiler inspector is responsible for ensuring the safety and compliance of boilers. By notifying the inspector, they can assess the defect and determine the necessary repairs or actions to be taken to address the issue effectively.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 19, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 03, 2013
    Quiz Created by
    Serviceking

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