Gotta Catch Em All!!! Flashcards
A dual Duct AHU has hot and cold Ducts connected to ___________ _______.
A. Supply Duct
B. Return Duct
C. VAV Box
D. Mixing Box
D. Mixing Box
A dual duct AHU has hot and cold ducts connected to a mixing box. The mixing box is responsible for mixing the hot and cold air streams to achieve the desired temperature before supplying it to the conditioned space. This allows precise control over the temperature of the supplied air.
A terminal reheat AHU delivers air at constant ______ degrees. A reheat coil is connected to the thermostat to maintain comfort in the space.
A. 55
B. 65
C. 58
D. 62
A. 55
A terminal reheat AHU delivers air at a constant temperature of 55 degrees. This is achieved by using a reheat coil connected to the thermostat, which allows for the adjustment of the air temperature to maintain comfort in the space.
An induction AHU used High Pressure air flowing through the ________ to draw air across the heating coil.
A. Induction coils
B. Induction nozzles
C. Venturi nozzles
D. Induction vanes
B. Induction nozzles
An induction AHU uses high pressure air flowing through the induction nozzles to create a low pressure zone, which in turn draws air across the heating coil. The induction nozzles create a venturi effect, where the high velocity air passing through the nozzles creates a low pressure zone that draws in surrounding air. This allows the AHU to efficiently heat or cool the air passing through the heating coil.
When two or more boilers are connected into a common steam header, and each boiler is equipped with a man-hole,_____ stop valves must be used on each boiler.
A. 4
B. 3
C. 5
D. 2
D. 2
When two or more boilers are connected into a common steam header, and each boiler is equipped with a man-hole, 2 stop valves must be used on each boiler. This is because having 2 stop valves on each boiler provides an additional level of safety and allows for maintenance and repairs to be carried out on one valve while the other valve remains operational. It also helps in isolating the boiler from the common header in case of any emergency or maintenance requirements.
Galvanic corrosion occurs when ______________, metals are in direct contact with each other in a _______________ environment.
A. Similar, humid
B. Similar, conductive
C. Dissimilar, humid
D. Dissimilar, conductive
D. Dissimilar, conductive
Galvanic corrosion occurs when dissimilar metals are in direct contact with each other in a conductive environment. This is because when two different metals come into contact, an electrochemical reaction takes place due to the difference in their electrical potentials. The conductive environment facilitates the flow of electrons between the metals, leading to the corrosion of the less noble metal. The presence of moisture or humidity further accelerates this corrosion process.
A stay that is shorter than 8” and threaded is required to have a __________
A. Tell tale hole
B. Stay brace
C. Riveted connection
D. Bolt brace
A. Tell tale hole
A stay that is shorter than 8” and threaded is required to have a tell tale hole.
A ___________ Pump is a Positive Displacement Pump.
A. Centrifugal
B. Duplex
C. Rotary
D. Reciprocating
D. Reciprocating
A reciprocating pump is a type of positive displacement pump where the high-pressure seal reciprocates with the piston. These pumps are capable of moving fluid at a consistent rate regardless of the system pressure, which makes them ideal for applications requiring precise volumes of fluid to be moved. Reciprocating pumps are commonly used in scenarios where a specific amount of fluid must be dealt with in a controlled, steady manner.
In lieu of a stop valve a ____________ _____may be used instead of the stop valve ___________ to the boiler.
A. Non-return valve, closest
B. Non-return valve, farthest
C. Check valve, closest
D. Check valve, farthest
A. Non-return valve, closest
A non-return valve may be used instead of a stop valve that is closest to the boiler. A non-return valve allows fluid or gas to flow in only one direction, preventing backflow. In this case, it would prevent any fluid or gas from flowing back into the boiler when the stop valve is closed. Using a non-return valve closest to the boiler ensures that it is positioned in the most effective location to prevent backflow.
A slow opening blowdown valve must complete _____ turns between full open and full shut.
A. 3
B. 2
C. 5
D. 4
C. 5
What is the restriction in circulation due to a steam pocket inside the pump.
A. Pump cavitation
B. Steam bound
C. Vacuum bound
D. Vacuum cavitation
B. Steam bound
The restriction in circulation due to a steam pocket inside the pump is known as “steam bound.” Steam binding occurs when steam pockets form within the pump, leading to a decrease in the pump’s efficiency and potential damage. The steam pockets hinder the normal flow of liquid, causing disruptions in circulation. This phenomenon is associated with issues such as cavitation, where the formation and collapse of vapor bubbles result in mechanical stress and damage to pump components. Proper pump design, operation, and maintenance practices are crucial to prevent steam binding and related problems.
One grain is equal to ________ parts per million.
A. 17.1
B. 18.5
C. 10
D. 33.3
A. 17.1
Parts per million (ppm) is a unit used to express the concentration of a substance in a solution. It represents the number of parts of the substance per one million parts of the solution. In this case, one grain is equal to 17.1 parts per million
Name the 4 steps needed to perform regeneration on a zeolite water softer _____________, ________________, ________________________, _____________________________.
A. Pre-rinse, backwash, membrane sweep, regenration
B. Brine rinse, backwash, membrane sweep, back in service
C. Backwash, Brine Rinse, slow / fast rinse, back in service
D. Backwash, brine rinse, slow / fast rinse, regeneration
C. Backwash, Brine Rinse, slow / fast rinse, back in service
The correct answer is “Backwash, Brine Rinse, slow / fast rinse, back in service.” These are the four steps needed to perform regeneration on a zeolite water softener. First, the system needs to be backwashed to remove any accumulated debris or contaminants. Then, a brine rinse is done to flush out the accumulated hardness minerals from the zeolite resin bed. After that, a slow or fast rinse is performed to ensure that all the brine solution is removed from the system. Finally, the system is put back in service, ready to soften water again.
A solid that precipitates out of solution and adhere to the boiler heating surfaces is called__________.
A. Scale
B. Precipitant
C. Crust
D. Embrittlement
A. Scale
Scale is the correct answer because it refers to the solid that forms and adheres to the heating surfaces of a boiler. This scale is typically formed when minerals and impurities in the water precipitate out and accumulate over time, reducing the efficiency of the boiler and potentially causing damage.
In a ___________ water softener, calcium and magnesium ions are exchanged for sodium ions. The result is a soft salt sludge that can be easily removed by bottom blowdown.
A. Zeolite
B. Sodium bicarbonate
C. Activated carbon
D. Ion exchange
A. Zeolite
In a zeolite water softener, calcium and magnesium ions are exchanged for sodium ions. Zeolite is a type of mineral with a porous structure that allows it to trap and exchange ions. When hard water passes through the zeolite resin bed, the calcium and magnesium ions are attracted to the zeolite and are replaced by sodium ions. This process effectively softens the water by reducing the concentration of calcium and magnesium ions. The softened water then flows out of the system, while the calcium and magnesium ions are retained in the zeolite resin bed, forming a soft salt sludge that can be easily removed by bottom blowdown.
The color of Cylinder containing R-11 is _________ before 2020.
Orange
White
Light Green
Coral Red
A. Orange
The color of the cylinder containing R-11 is orange before 2020.
A ____________________ pump can be started with the discharge valve shut.
A. Centrifugal
B. Rotary
C. Reciprocating
D. Simplex
A. Centrifugal
A centrifugal pump can be started with the discharge valve shut because it uses centrifugal force to move the fluid. When the pump is started, the impeller spins rapidly, creating a centrifugal force that pushes the fluid towards the outer edges of the impeller. This force allows the fluid to be pushed through the pump even with the discharge valve shut.
The lowest visible water level in the gauge glass is ___ above the top of the boiler tubes on a scotch marine boiler.
A. 2”
B. 3”
C. 12”
D. 6”
A. 2”
The lowest visible water level in the gauge glass is 2” above the top of the boiler tubes on a scotch marine boiler. This is important because it ensures that there is enough water in the boiler to prevent overheating and damage to the tubes. It also allows for proper monitoring and maintenance of the water level in the boiler.
The three classes of feedwater pumps are _______________, _______________, and _____________.
A. Reciprocating, centrifugal, and rotary
B. Reciprocating, centrifugal, and screw
C. Reciprocating, scroll, and centrifugal
D. Positive displacement, reciprocating, and centrifugal
A. Reciprocating, centrifugal, and rotary
The correct answer is “reciprocating, centrifugal, and rotary”. These three classes refer to different types of feedwater pumps. Reciprocating pumps use a piston or plunger to create pressure and move the fluid. Centrifugal pumps use centrifugal force to move the fluid and are commonly used in industrial applications. Rotary pumps use rotating mechanisms to move the fluid, such as gears or vanes. Therefore, the correct answer includes all three types of pumps
The minimum size for the connection in between the gauge glass and the water column is _____.
A. 3/8”
B. 3/4”
C. 1/2”
D. 1/4”
C. 1/2”
The minimum size for the connection between the gauge glass and the water column is 1/2”. This means that the diameter of the connection should be half an inch. It is important to have a proper size for the connection to ensure that there is adequate flow of water between the gauge glass and the water column. Having a smaller size could restrict the flow, while a larger size may lead to leakage or improper readings. Therefore, 1/2” is the correct minimum size for the connection.
_____________ is the replacement for refrigerant R-22.
A. R-410a
B. R-134a
C. R-401a
D. R-123
A. R-410a
R-410a is the replacement for refrigerant R-22. Refrigerant R-22 is being phased out due to its harmful effects on the ozone layer. R-410a is a more environmentally friendly alternative that does not contribute to ozone depletion. It is commonly used in air conditioning systems as a refrigerant.
A refrigerant system using R-134a is running at 148 psi on the discharge and 16psi on the suction. What is the compression ratio of the compression?
A. 9.2:1
B. 5.3:1
C. 10:1
D. 8:1
B. 5.3:1
The compression ratio (CR) of a refrigeration or compression system is calculated by dividing the absolute discharge pressure (P2) by the absolute suction pressure (P1):
CR = P2 / P1
In this case, you provided the pressures in psi, but to calculate the compression ratio, we need to convert them to absolute pressures in psi (psia). Absolute pressure is the sum of the gauge pressure and atmospheric pressure (14.7 psi at sea level).
Absolute discharge pressure (P2) = 148 psi + 14.7 psi = 162.7 psi
Absolute suction pressure (P1) = 16 psi + 14.7 psi = 30.7 psi
Now, we can calculate the compression ratio:
CR = P2 / P1
CR = 162.7 psi / 30.7 psi
CR ≈ 5.3
So, the compression ratio of the refrigerant system is approximately 5.3:1.
When using a lift lever to manually test a safety valve, the boiler pressure must be at least _____ percent of the safety valve setpoint.
A. 80
B. 75
C. 70
D. 90
B. 75
When using a lift lever to manually test a safety valve, the boiler pressure must be at least 75 percent of the safety valve setpoint. This is because the lift lever test is performed to ensure that the safety valve is functioning properly and can relieve excess pressure in the boiler. By testing at 75 percent of the setpoint, it ensures that the safety valve will open and relieve pressure when it reaches the setpoint, providing a safety measure for the boiler system.
Unlike an infrared scanner, the ultraviolet scanner is not affected by the light given off by hot _________________.
A. Flames
B. Plasma
C. Refractories
D. Gasses of combustions
C. Refractories
An ultraviolet scanner is not affected by the light given off by hot refractories. Refractories are heat-resistant materials used in high-temperature industrial processes, such as furnaces. Infrared scanners rely on detecting the heat emitted by objects, including refractories, whereas ultraviolet scanners use ultraviolet light to detect and analyze different materials. Therefore, the ultraviolet scanner is not affected by the light emitted by hot refractories.
The _________ __________ and _____________ _________ _______ sense heat to prove flame in the boiler.
A. Stack switch and rectifying flame rod
B. Flue sensor, infra red sensor
C. Stack switch, and infrared sensor
D. Flue sensor, rectifying flame rod
A. Stack switch and rectifying flame rod
The stack switch and rectifying flame rod are used to sense heat and prove flame in the boiler. The stack switch is a device that detects the temperature in the flue gas stack, while the rectifying flame rod is a sensor that detects the presence of a flame by measuring the electrical current generated by the flame. Together, these two components provide a reliable method for monitoring and ensuring the presence of a flame in the boiler.
A _______________ ____________ air handler unit operates at the rated capacity at all times.
A. Variable Volume
B. Constant Volume
C. Single Zone
D. Multi-Zone
B. Constant Volume
A constant volume air handler unit operates at the rated capacity at all times, meaning that it consistently delivers a fixed volume of air. This type of air handler unit is typically used in buildings where the air conditioning or heating requirements do not vary significantly throughout the day or year. The unit’s fan runs at a constant speed, providing a consistent airflow and temperature to the space it serves. This design is often more energy-efficient and easier to control compared to variable volume air handler units, which can adjust their airflow based on demand.
If a bulge in a boiler is not down more than ______ of its length, it should be left alone unless the metal is too badly burned.
A. 10%
B. 2%
C. 1%
D. 5%
B. 2%
If a bulge in a boiler is not down more than 2% of its length, it should be left alone unless the metal is too badly burned. This means that if the bulge is less than 2% of the length of the boiler, it is considered acceptable and does not require any immediate action. However, if the metal is severely damaged or burned, it may need to be addressed regardless of the size of the bulge.
A dry pipe on a Scotch Marine Boiler is used to remove _____________ from the steam prior to leaving the boiler.
A. Moisture
B. Oxygen
C. Air
D. CO2
A. Moisture
A dry pipe on a Scotch Marine Boiler is used to remove moisture from the steam prior to leaving the boiler. This is important because excessive moisture in the steam can cause damage to the piping system and reduce the efficiency of the boiler. By removing moisture, the dry pipe helps to ensure that the steam is dry and of high quality, which is necessary for various industrial processes.
The ____________ _________ mechanism on the high limit control call attention if the ________________ control has malfunctioned.
A. Automatic reset; operating
B. Automatic reset; burner
C. Manual reset; operating
D. Manual reset; burner
C. Manual reset; operating
The high limit control has two types of reset mechanisms: automatic reset and manual reset. In this case, the correct answer is “manual reset; operating.” This means that if the operating control has malfunctioned, the manual reset mechanism on the high limit control will call attention to the issue.
An ___________________ Ring is on method used to support the Morrison Tube in a Scotch Marine Boiler.
A. Adamson
B. Morrison
C. Smithers
D. Faulkner
A. Adamson
An Adamson Ring is a method used to support the Morrison Tube in a Scotch Marine Boiler. This means that the correct answer is “Adamson” as it is the specific type of ring used for this purpose.
A 10 x 5x 15 duplex reciprocating pump has a steam cylinder diameter of ____inches, has a water cylinder diameter of _____ inches, and a long stroke of _____inches.
A. 10, 5, 15
B. 15, 5, 10
C. 5,10, 15
D. 20, 10, 30
A. 10, 5, 15
The given answer states that the steam cylinder diameter is 10 inches, the water cylinder diameter is 5 inches, and the long stroke is 15 inches. This suggests that the dimensions of the reciprocating pump are such that the steam cylinder has a larger diameter compared to the water cylinder, and the stroke length is longer than the cylinder diameters.
Boiler stop valves over 2” diameter must be ______________-___________- and -_________.
A. Packing Gland and Wheel
B. Outside Screw and Yolk
C. Outside Stem and Wheel
D. Outside Stem and Yolk
B. Outside Screw and Yolk
Boiler stop valves over 2” diameter must have an outside screw and yolk. This configuration allows for easy operation and control of the valve. The outside screw refers to the screw mechanism that moves the valve stem in and out, while the yolk is the handle or wheel that is used to turn the screw. This design ensures that the valve can be easily opened and closed, providing efficient and reliable control over the flow of steam or water in the boiler system.
A centrifugal pump uses a ________ to convert velocity energy to pressure energy.
A. Impeller
B. Volute
C. Guide vanes
D. Propeller
B. Volute
A centrifugal pump uses a volute to convert velocity energy to pressure energy. The volute is a curved casing that surrounds the impeller, which is the rotating component of the pump. As the impeller spins, it creates a centrifugal force that pushes the fluid towards the outer edges of the volute. This causes the fluid to gain pressure energy as its velocity decreases. The volute then directs the high-pressure fluid towards the pump outlet, allowing it to be used for various applications such as water circulation, irrigation, or industrial processes.
A 26” x 48” x rectangular Duct is replaced with a round Duct. What is the minimum diameter of the round Duct to provide the same area?
A. 39.87’
B. 19.93”
C. 35.33”
D. 17.66”
A. 39.87’
To match the airflow area of a rectangular duct (26” x 48”), a round duct’s area must be equal. Using the area of the rectangle, we calculate the diameter of a circle that would have the same area. The formula involves dividing the rectangular area by π and taking the square root, then doubling it for the diameter, resulting in approximately 39.87 inches.
A ________ _______ AHU supplies conditioned air to only one area of the building.
A. Variable Volume
B. Constant Volume
C. Single Zone
D. Multi Zone
C. Single Zone
A Single Zone AHU supplies conditioned air to only one area of the building. This means that the AHU is designed to serve a specific zone or room, and the air flow and temperature can be adjusted for that particular area. This type of AHU is commonly used in small spaces or individual rooms where the conditioning needs may differ from other areas of the building.
The pipes connecting the water column to the boiler must be a minimum diameter of ____ inch.
A. 2”
B. 2.5”
C. 1”
D. 3/4”
C. 1”
The pipes connecting the water column to the boiler must have a minimum diameter of 1 inch. This is necessary to ensure proper flow and pressure of water between the water column and the boiler. A smaller diameter pipe may not be able to handle the required volume of water, leading to inadequate water supply and potentially causing issues with the boiler’s operation.
The two types of electric boilers are _______________ and ______________.
A. Resistance & electrode
B. Resistance & capacitance
C. Arc Tube & electrode
D. Electrode & capacitance
A. Resistance & electrode
The correct answer is resistance & electrode. Electric boilers can be categorized into two types based on their heating elements: resistance and electrode. Resistance boilers use electrical resistance to generate heat, while electrode boilers use electric current passing through water to produce heat.
There is no _____________ _________ ____ _________________ above the critical pressure, because water and steam have the same density.
A. Specific Heat of Atomization
B. Latent Heat of vaporization
C. Specific heat of vaporization
D. Latent heat of atomization
B. Latent Heat of vaporization
The statement in the question suggests that there is no change in density between water and steam above the critical pressure. This indicates that there is no phase change occurring, as the density of water and steam would be different if vaporization was taking place. The term “Latent Heat of vaporization” refers to the amount of heat energy required to convert a liquid into a vapor, and since there is no vaporization happening in this scenario, the latent heat of vaporization would not be applicable.
______ ________________ are used extensively in pulverized-fuel-burning plants in order to keep heat-absorbing surfaces free from soot and ash buildup.
A. Soot Blowers
B. Stack Scrubbers
C. Chain Grate Stokers
D. Tube puncher
A. Soot Blowers
Soot blowers are used extensively in pulverized-fuel-burning plants to keep heat-absorbing surfaces free from soot and ash buildup. Soot and ash can accumulate on these surfaces, reducing their efficiency and potentially causing damage. Soot blowers use high-pressure steam or compressed air to remove the buildup, ensuring that the surfaces remain clean and heat transfer is optimized. This helps to maintain the overall efficiency and performance of the plant.
______________ is used on high pressure steam plants to absorb oxygen. It’s is not typically used on low pressure steam plants because it is a slow reaction to absorb oxygen.
A. Deaerator
B. Hydrazine
C. Amines
D. Oxygen scavengers
B. Hydrazine
Hydrazine is used on high pressure steam plants to absorb oxygen. It is not typically used on low pressure steam plants because it is a slow reaction to absorb oxygen.
According to ASME code a HTHW boiler is any boiler that operates above ____________ or ____________.
A. 150PSI, 200 Deg. F
B. 150 PSI, 100 Deg. C
C. 160PSI, 250Deg.F
D. 14.7 PSI, 212 Deg. F
C. 160PSI, 250Deg.F
According to the ASME code, a HTHW (High Temperature Hot Water) boiler is defined as a boiler that operates above 160 PSI and 250 degrees Fahrenheit.
The waste products from a sugar cane are used in a _______________ plant.
A. Bagasse
B. Black liquor
C. Red liquor
D. Saccarine refinery
A. Bagasse
Bagasse is the fibrous residue left after extracting juice from sugar cane. It is a byproduct of the sugar cane industry and is commonly used as a fuel in power plants. Therefore, the waste products from sugar cane, which include bagasse, are used in a power plant
______________ usually caused cavities to form at grain boundaries in metal, and these cavities coalesce to form cracks.
A. Corrosion
B. Crusting
C. Creep
D. Grain fatigue
C. Creep
Creep is the correct answer because it refers to the slow and gradual deformation of a material under constant stress or high temperatures. This can cause cavities to form at the grain boundaries in metal, which then coalesce to form cracks.
Cogeneration plants sell ____________ to the local industrial plants, and _____________ to the local __________.
A. Fuel oil, steam, power plants
B. Steam, condensate, congeners
C. Propane, fuel oil, utilities
D. Steam, electricity, utilities
D. Steam, electricity, utilities
Cogeneration plants sell steam and electricity to the local utilities.
If a tubesheet is corroded more than ______ percent of the original thickness, the defective section must be cutout and flush patched installed.
A.
10
B.
20
C.
35
D.
50
Correct Answer
D. 50
Explanation
If a tubesheet is corroded more than 50 percent of the original thickness, the defective section must be cutout and flush patched installed. This means that if the corrosion has caused more than half of the tubesheet’s original thickness to be eroded, it is necessary to remove that section and replace it with a flush patch. This is likely because the corrosion has weakened the tubesheet significantly and it cannot function effectively in its current state
A _________ _______AHU has heating and cooling coils located at the different zones. It uses air dampers from the hot and cold ducts to maintain zone comfort.
A. Variable Volume
B. Constant Volume
C. Single Zone
D. Multi Zone
D. Multi Zone
A Multi Zone AHU has heating and cooling coils located at different zones, allowing for individual temperature control in each zone. It uses air dampers from the hot and cold ducts to maintain comfort in each zone. This type of AHU is ideal for buildings with multiple areas that require different temperature settings.
The operation of a black liquor boiler is known for its __________ generation, and heat recovery of _______ _______.
A. Steam, sulpfuric acid
B. Power, waste heat
C. Lignin, soda ash
D. Steam, soda ash
D. Steam, soda ash
The operation of a black liquor boiler is known for its steam generation, which refers to the production of steam as a result of the boiler’s operation. Additionally, the boiler is also known for its heat recovery of soda ash, which means that it is able to recover and utilize the waste heat produced during the process to generate soda ash.
Number 4 fuel oil has _____________btu’s per pound.
A. 19,720
B. 19,657
C. 22,475
D. 18,840
D. 18,840
Number 4 fuel oil has 18,840 BTU’s per pound.
Leaking safety valve should be ____________ to stop the leakage, never ___________.by adjustment to stop the leakage.
A. Recalibrated, patched
B. Replaced, patched
C. Reground, tightened
D. Replaced, tightened
C. Reground, tightened
When a safety valve is leaking, it means that it is not sealing properly. To fix this issue, the valve should be reground, which involves smoothing the surface of the valve and its seat to ensure a proper seal. Additionally, the valve should be tightened to ensure that it is securely closed and no leakage occurs. Patching or replacing the valve would not address the underlying issue of improper sealing.
Hardness is a measure of the ____________ and _______________ ions in solution.
A. Calcium, bicarbonate
B. Calcium, sulphate
C. Calcium, magnesium
D. Carbonate, bicarbonate
C. Calcium, magnesium
Hardness is a measure of the concentration of calcium and magnesium ions in solution. These ions contribute to the overall hardness of water. Calcium and magnesium ions can come from various sources, such as dissolved minerals in the ground or rocks. The presence of these ions can affect the taste, appearance, and performance of water in various applications, such as in industrial processes or household use. Therefore, measuring the concentration of calcium and magnesium ions is important in determining the hardness of water.
Operating a boiler at temperatures 10° to 20°F above the design temperature for long period of time can cause a life reduction of _____ to _____ years.
A. 10-20
B. 5-10
C. 20-40
D. 15-30
A. 10-20
Operating a boiler at temperatures 10°F to 20°F above the design temperature for a long period of time can cause a reduction in its lifespan by 10 to 20 years.
Permanently hard water is water that contains large quantities of calcium and magnesium blank.
A. Carbonate
B. Bicarbonate
C. Nitrites
D. Sulfites
D. Sulfites
Permanently hard water is water that contains large quantities of calcium and magnesium sulfites. Sulfites are compounds that can contribute to water hardness and can form insoluble precipitates with calcium and magnesium ions. These precipitates can cause scale buildup in pipes and appliances, reducing their efficiency and lifespan.
Temporary hard water is water that contains large quantities of calcium and magnesium_______________.
A. Sulphate
B. Sulphite
C. Bicarbonate
D. Carbonate
C. Bicarbonate
Temporary hard water is water that contains large quantities of calcium and magnesium bicarbonate. When temporary hard water is heated or boiled, the bicarbonate ions decompose, resulting in the formation of insoluble carbonates. This causes the formation of scale or deposits on surfaces, such as in kettles or pipes.
Temporary hard water is water that contains large quantities of calcium and magnesium
A ________ __________ is constructed of flat plates, referred to as a tube sheet an tube cap sheet.
A. Membrane wall
B. Waterwall
C. Firewall
D. Box header
D. Box header
A box header is a type of heat exchanger that is constructed of flat plates, specifically a tube sheet and tube cap sheet. This type of heat exchanger is commonly used in industrial applications to transfer heat between fluids. The box header design allows for efficient heat transfer due to the large surface area provided by the flat plates.
A box header is a type of heat exchanger that is constructed of flat plates, specifically a tube sheet and tube cap sheet. This type of heat exchanger is commonly used in industrial applications to transfer heat between
The percentage of excess air required to burn natural gas, fuel oil, or pulverize coal is to percent.
A. 15-35
B. 10-20
C. 15-45
D. 10-30
D. 10-30
The correct answer is 10-30. This range represents the percentage of excess air required to burn natural gas, fuel oil, or pulverized coal. Excess air is the amount of air supplied to the combustion process above the theoretical amount required for complete combustion. A range of 10-30% ensures efficient and complete combustion while minimizing emissions.
A reciprocating pump has a water cylinder that is 18” diameter and 15” long, the plunger in the cylinder stroke ¾ of the length of the cylinder. What is the volume of water displaced with each stroke of the plunger?
A. 2,861.325 cu”
B. 3,576.66 cu”
C. 4050 cu”
D. 3,037.5 cu”
A. 2,861.325 cu”
The volume of water displaced with each stroke of the plunger can be calculated using the formula for the volume of a cylinder, which is V = πr²h. In this case, the diameter of the cylinder is given as 18”, so the radius is half of that, which is 9”. The length of the cylinder is given as 15”. The plunger stroke is given as ¾ of the length of the cylinder, which is 15” x ¾ = 11.25”. Using these values, we can calculate the volume as V = π(9²)(11.25) = 2,861.325 cu”.
A 600 horsepower boiler’s operating at 15 psi the boiler burners 18,255 ft³ per hour of natural gas containing 1025 BTU’s per ft³. The Chimney receives 8,750 pph of flue gas containing 475 BTU’s per pound. What is the boiler efficiency through the indirect method?
A. 77.8%
B. 88.7%
C. 92.7%
D. 97.2%
A. 77.8%
To calculate boiler efficiency indirectly: Input: Calculate heat input from natural gas. Output: Determine heat absorbed by water using boiler horsepower. Losses: Calculate heat lost in flue gas. Efficiency: Use formula Efficiency = (1 - Losses/Input) × 100. Given values yield an efficiency of 77.8%.
A pressure gauge installed 30 feet below the boiler drum reads 135 psi. The actual pressure on the boiler is ________ psi.
A. 120
B. 122
C. 155
D. 135
B. 122
The pressure gauge installed 30 feet below the boiler drum reads 135 psi. However, the actual pressure on the boiler would be slightly lower due to the hydrostatic pressure caused by the weight of the water column above the gauge. The hydrostatic pressure increases by 0.433 psi for every foot of water depth. Since the gauge is 30 feet below the drum, the hydrostatic pressure would be 13 psi (30 feet x 0.433 psi/ft). Therefore, the actual pressure on the boiler would be 135 psi - 13 psi = 122 psi.
The Economic boiler was an improvement on the HRT boiler. The economic boiler has more ___________ ____________ per square foot of floor space, it requires less __________ _________, and is easier to _____________.as a single package unit.
A. Steam production, refractory, maintain
B. Heating surface, brick work, maintain
C. Heating surface, brick work, install
D. Steam production, brick work, install
C. Heating surface, brick work, install
The economic boiler has more heating surface per square foot of floor space, which means it can produce more steam. It also requires less brick work, making it easier to install and maintain.
The economic boiler has more heating surface per square foot of floor space, which means it can produce
Coal gas is produced using the volatile matter from _______________ coal, an d has a heating value of __________ BTU’s per cubic foot.
A. Anthracite, 1750
B. Bituminous, 550
C. Lignite, 550
D. Bituminous, 1750
Bituminous, 550
Coal gas is produced using the volatile matter from bituminous coal, and has a heating value of 550 BTU’s per cubic foot.
Coal gas is produced using the volatile matter from bituminous coal, and has a heating value of 550 BTU
Butane and propane are produced from the manufacturing of _____________. Propane has a heating value of __________BTU’s per cubic foot. Butane has a heating value of about
A. Gasoline, 2500, 3200
B. Natural gas, 3200, 2500
C. Gasoline, 3200, 2500
D. Natural gas, 2500, 3200
A. Gasoline, 2500, 3200
Butane and propane are produced from the manufacturing of gasoline. Propane has a heating value of 2500 BTU’s per cubic foot, while butane has a heating value of about 3200 BTU’s.
The pressure relief valve on a hot water boiler must be at least ______ diameter and not more than ______diameter.
3/4”, 4 1/2”
3/4”, 2 1/2”
1”; 4 1/2”
1”, 2 1/2”
3/4”, 4 1/2”
The pressure relief valve on a hot water boiler must be at least 3/4” in diameter to ensure proper functioning and prevent excessive pressure buildup. It should also not exceed 4 1/2” in diameter to avoid any potential issues or restrictions in the system.
The color of Cylinder containing R-12 is _________ before 2020.
A. Orange
B. White
C. Light Green
D. Rose
B. White
The color of the cylinder containing R-12 is white before 2020.
Calcium and magnesium bicarbonate produce _____________ hardness.
A. Permanent
B. Temporary
C. General
D. Rankine
B. Temporary
Calcium and magnesium bicarbonate produce temporary hardness. Temporary hardness refers to the presence of dissolved calcium and magnesium bicarbonate ions in water, which can cause scale buildup on surfaces and reduce the effectiveness of soaps and detergents. This type of hardness can be easily removed by boiling the water or using a water softener.
The presence of scale on the boiler tubes will result in a _______________ in the boilers efficiency, and an _______________ in the temperature on the boiler tubes.
A. Decrease, improvement
B. Increase, improvement
C. Decrease, increase
D. Increase, decrease
C. Decrease, increase
The presence of scale on the boiler tubes will cause a decrease in the boilers efficiency, as the scale acts as an insulator and reduces heat transfer. This decrease in efficiency will result in an increase in the temperature on the boiler tubes, as the heat is not being effectively transferred away.
Sulfur in the soot then unites with moisture from condensation to produce a ____________ ________.
A. Sulfurous acid
B. Heavy soot
C. Toxic gas
D. Yellowish smoke
A. Sulfurous acid
When sulfur in the soot combines with moisture from condensation, it forms sulfurous acid. This reaction occurs when the sulfur in the soot reacts with water vapor in the air, resulting in the formation of sulfurous acid. Sulfurous acid is a weak acid that is commonly found in polluted air and can contribute to acid rain.
The color of Cylinder containing R -22 is ___________ ________ before 2020.
A. Orange
B. White
C. Light Green
D. Coral Red
C. Light Green
A ____________ is a gelatin like substance that has very small particles in suspension. These particles are usually less than _______ microns in size.
A. Colloidal; 0.20
B. Colloidal; 0.50
C. Aggregate; 0.20
D. Aggregate; 0.50
A. Colloidal; 0.20
A colloidal is a gelatin-like substance that has very small particles in suspension. These particles are usually less than 0.20 microns in size.
Welding a flat strip of metal between the waterwall tubes is known as _______________wall construction.
A. Membrane
B. Tube sheet
C. Header
D. Fire
A. Membrane
Welding a flat strip of metal between the waterwall tubes is known as membrane wall construction. This type of construction involves creating a continuous, sealed membrane of metal that separates the water and steam from the combustion gases in a boiler. The membrane wall construction helps to improve the efficiency and safety of the boiler by providing a strong and reliable barrier between the different components.
When the boiler water has a high level of solids, steam bubbles can be trapped below the water line, causing water level fluctuation is known as ______________.
A. Water blanket
B. Foaming
C. Priming
D. Entraintment
B. Foaming
Foaming is the correct answer because when the boiler water has a high level of solids, steam bubbles can get trapped below the water line, resulting in water level fluctuation. This phenomenon is known as foaming.
_______________ is when water or impurities leave the boiler with the steam.
A. Carryover
B. Priming
C. Entraintment
D. Foaming
A. Carryover
Carryover is the term used to describe the situation when water or impurities are carried out of the boiler along with the steam. This can happen due to factors such as high steam velocities, inadequate separation equipment, or excessive boiler water levels. Carryover can lead to various problems, including damage to downstream equipment, reduced steam quality, and decreased efficiency of the system.
The color of Cylinder containing R-123 is _________ ________ before 2020.
A. White
B. Light green
C. Light gray
D. Light blue
C. Light gray
The color of the cylinder containing R-123 is light gray before 2020.
Too much _______ causes dense, white smoke.
Fuel
Air
Sulfur
Nitrogen
Air
When there is too much air present in a combustion process, it can cause incomplete burning of the fuel. This incomplete burning produces dense, white smoke.
_____________ consist of relative close-spaced vertical tubes forming the four walls of the furnace.
Membrane walls
Waterwalls
Tubesheets
Box Headers
Waterwalls
Waterwalls consist of relatively close-spaced vertical tubes forming the four walls of the furnace. These tubes are designed to absorb heat from the combustion process and transfer it to the surrounding water, creating steam. Waterwalls are an important component in boilers and furnaces as they help in the efficient transfer of heat and ensure the proper functioning of the system.
Because the shell of the HRT is exposed to the fire, it requires a careful ___________ ____________ for scale, bulging and blisters.
Preventative maintenance
Cleaning procedures
Internal inspection
Mechanical debreifing
Internal inspection
The correct answer is internal inspection. The reason for this is that the shell of the HRT is exposed to the fire, which can cause damage such as scale, bulging, and blisters. To ensure the safety and proper functioning of the HRT, a careful internal inspection is necessary. This inspection allows for the identification of any potential issues or damage that may have occurred due to the exposure to fire. By conducting regular internal inspections, any problems
Leaking that occurs inside a centrifugal pump from the discharge to the suction, is known as _______.
Skipping
Slippage
Drippage
Slip
Slip
Slip refers to the leaking that occurs inside a centrifugal pump from the discharge to the suction. It is a common issue in centrifugal pumps where a small amount of fluid leaks back from the high-pressure side to the low-pressure side. This can happen due to various reasons such as worn-out seals, damaged impeller, or excessive pressure. Slip can affect the efficiency and performance of the pump, and it needs to be addressed to prevent any further damage or loss of fluid.
The color of Cylinder containing R -134a is _________ ________ before 2020.
White
Light green
Light blue
Rose
Light blue
The color of the cylinder containing R-134a is light blue before 2020.
One grain is equal to ______ parts per million. _________grains equals one pound.
1; 1,000,000
34.5; 970.3
17.1; 7,000
14.4; 6,800
17.1; 7,000
One grain is equal to 17.1 parts per million. Therefore, 7,000 grains equals one pound.
An ________ _________ mounted on the Water Column will sound an alarm if the water level is too high or too low.
Remote sensor
Low water cut out
Alarm whistle
Water column alarm
Alarm whistle
The correct answer is “alarm whistle.” An alarm whistle mounted on the Water Column will sound an alarm if the water level is too high or too low. This type of whistle is designed to alert individuals nearby when there is an issue with the water level, ensuring prompt action can be taken to address the problem.
A _______________ is a U-tube draft gauge to measure the differential pressure between two points.
Manometer
Balometer
Pyrometer
Draft meter
Manometer
A manometer is a U-tube draft gauge used to measure the differential pressure between two points. It consists of a U-shaped tube partially filled with a liquid, such as mercury or water. The pressure difference between the two points causes the liquid to rise or fall in one side of the tube, indicating the pressure difference. Manometers are commonly used in various applications, such as measuring gas pressure, airflow, and fluid levels.
The color of Cylinder containing R-401A is __________.
Coral red
Light blue
Pinkish red
Rose
Pinkish red
The cylinder containing R-401A refrigerant is colored pinkish red. The pinkish red color is used to identify R-401A, which is a type of hydrofluorocarbon (HFC) refrigerant. This color-coding system is important in the refrigeration industry as it helps technicians, engineers, and other professionals to quickly and accurately identify the refrigerant being used.
An obstruction in the ___________ _______________ to the water column will cause a slow rising water level in the gauge glass after a gauge glass blow down.
Bottom connection
Top connection
Blow down
Quick opening valve
Bottom connection
If there is an obstruction in the bottom connection to the water column, it will prevent the water from flowing freely. As a result, when a gauge glass blow down is performed, the water level in the gauge glass will rise slowly instead of quickly decreasing. This is because the obstruction hinders the water from being discharged efficiently, causing a delay in the water level adjustment in the gauge glass.
In order for a black liquor boiler to sustain combustion, the liquor must contain over _____ % of solids.
85
58
83
53
58
A black liquor boiler requires a high concentration of solids in the liquor in order to sustain combustion. The correct answer is 58% because this is the percentage of solids that is necessary for the boiler to function properly.
A British thermal unit, BTU, is the amount of heat that need to raise the temperature on one ___________ of water one _________ _______________.
Pound, degree, Fahrenheit
Gallon, degree, Fahrenheit
Liter, degree, Celsius
Kilogram, degree, Celsius
Pound, degree, Fahrenheit
A British thermal unit (BTU) is a unit of measurement used to quantify the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.
A device used to reduce the temperature of superheated steam to a lower desired temperature is a _______________________.
Chiller
Thermal recovery unit
Supercooler
Desuperheater
Desuperheater
A desuperheater is a device used to reduce the temperature of superheated steam to a lower desired temperature. It achieves this by injecting a coolant or a liquid into the superheated steam, which absorbs the excess heat and cools down the steam. This process is commonly used in industrial applications where the temperature of the steam needs to be controlled for various purposes, such as preventing damage to equipment or improving the efficiency of a system.
The _____________ on the refrigeration system rejects the heat from the system.
Condenser
Evaporator
Compressor
Metering device
Condenser
The condenser is responsible for rejecting the heat from the refrigeration system. It is a component that helps in the cooling process by transferring heat from the refrigerant to the surrounding environment. This is done by condensing the refrigerant vapor into a liquid state, releasing heat in the process.
The color of Cylinder containing R410A is __________.
Light green
Orange
Coral red
Rose
Rose
Refrigerant cylinders, such as those containing R410A, follow a specific color-coding system to facilitate easy identification and to prevent mishandling. For R410A, a widely used refrigerant in air conditioning systems, the cylinder is colored rose. This standardization of colors helps technicians quickly recognize different types of refrigerants during installation or maintenance procedures. The rose color specifically helps in distinguishing R410A from other refrigerants which may have similar applications but different environmental impacts and handling requirements. Proper identification ensures safe usage, compliance with regulations, and efficient system performance.
The _____________ on the refrigeration system absorbs the heat from the space.
Condenser
Evaporator
Compressor
Metering device
Evaporator
The evaporator is the component in the refrigeration system that absorbs heat from the space. As the refrigerant passes through the evaporator, it evaporates and absorbs heat from the surrounding air or space, causing the temperature to decrease. This cooled refrigerant is then sent to the compressor to be pressurized and circulated back into the system.
To internally remove oxygen from the boiler, ____________ __________ is used.
Calcium carbone
Potassium chloride
Sodium sulfite
Sodium zeolite
Sodium sulfite
Sodium sulfite is used to internally remove oxygen from the boiler.
The chief heat producing elements in fuels are _______, _________, and _____________.
Carbon dioxide, hydrogen, sulfur
Carbon, hydrogen, sulfur
Carbon, oxygen, hydrogen
Nitrogen, hydrogen, sulfur
Carbon, hydrogen, sulfur
The chief heat producing elements in fuels are carbon, hydrogen, and sulfur. These elements have high energy content and when they undergo combustion, they release a significant amount of heat energy. Carbon and hydrogen are present in most organic compounds, which are commonly found in fuels such as coal, oil, and natural gas. Sulfur is also present in some fuels, and its combustion contributes to the heat production. Therefore, carbon, hydrogen, and sulfur are the primary elements responsible for the heat generation in fuels.
____________is the bleeding of a portion of the water to remove suspended solids.
Blowback
Blowdown
Cleanout
Purging
Blowdown
Blowdown is the process of bleeding a portion of the water to remove suspended solids. This is typically done in industrial settings, such as power plants or boilers, to maintain the quality of the water and prevent buildup of impurities. By removing the suspended solids through blowdown, the water can be kept clean and the equipment can operate more efficiently.
City Water pressure entering a building is 120 psi. The building is 185 feet tall, there is _____ psi city water pressure on the top floor of the building.
40
80
160
65
40
The pressure of water decreases with increasing height due to the gravitational force acting on it. This decrease in pressure is approximately 0.433 psi per foot of height. Therefore, for a building that is 185 feet tall, the decrease in pressure would be 185 multiplied by 0.433 psi. Calculating this, we get approximately 80 psi. So, the city water pressure on the top floor of the building would be 120 psi minus 80 psi, which equals 40 psi.
On HRT boilers, the shell is pitched 1 to 2 inches towards the back of the boiler to produce a more effective _________ ____________ of the boiler.
Natural draft
Gravity drip
Bottom blowdown
Angled slope
Bottom blowdown
The correct answer is “bottom blowdown.” On HRT boilers, the shell is pitched 1 to 2 inches towards the back of the boiler to produce a more effective bottom blowdown of the boiler. This means that any sediment or impurities that settle at the bottom of the boiler can be easily drained and removed through the bottom blowdown process. This helps to maintain the efficiency and performance of the boiler by preventing the buildup of harmful deposits.
A solution is said to be ______________ when it can no longer dissolve anymore impurities.
Logged
Nullified
Super Saturated
Saturated
Saturated
A solution is said to be saturated when it has reached its maximum capacity to dissolve any more impurities. In other words, it cannot dissolve any additional solute at a given temperature and pressure.
A solution is said to be saturated when it has reached its maximum capacity to dissolve any more impurities. In other words, it cannot dissolve any
Water at its boiling point is considered a _____________ liquid.
Superheated
Saturated
Super saturated
Sensible
Saturated
Water at its boiling point is considered a saturated liquid because at this temperature, it is in equilibrium with its vapor phase. This means that the liquid and vapor phases coexist and the liquid is saturated with vapor molecules. Any additional heat added to the system will cause the liquid to transition into a vapor phase.
The ratio of the boiler’s heat output to its heat input is _____________ _____________.
Heat differential
Boiler efficiency
Efficiency ratio
Heat ratio
Boiler efficiency
The correct answer is “boiler efficiency.” Boiler efficiency refers to the ratio of the heat output from the boiler to the heat input into the boiler. It is a measure of how effectively the boiler converts fuel into useful heat energy. A higher boiler efficiency indicates that the boiler is able to extract more heat from the fuel, resulting in lower fuel consumption and reduced energy waste.
Scale accumulation on the waterside of a firetube boiler can lead to possible blank and loosining of the tube.
Blistering
Spalling
Overheating
Efficiency loss
Overheating
Scale accumulation on the waterside of a firetube boiler can lead to overheating. When scale builds up on the boiler tubes, it acts as an insulator, preventing efficient heat transfer. This can cause the tubes to overheat, leading to potential damage and reduced efficiency of the boiler. Overheating can also result in the tubes becoming weakened and more prone to failure, posing a safety risk. Therefore, it is important to regularly clean and remove scale from the waterside of a firetube boiler to prevent overheating and maintain optimal performance.
A boiler horsepower is the evaporation into dry saturated steam of ________ pounds per hour from and 212°F.
970.3
34.5
18,840
33,826
34.5
A boiler horsepower is a unit of measurement used to indicate the rate at which a boiler can produce steam. In this context, it refers to the evaporation of steam into dry saturated steam. The answer of 34.5 pounds per hour indicates that a boiler with one horsepower can produce 34.5 pounds of dry saturated steam per hour when the water temperature is at 212°F.
Rectifying phototube and lead sulfide phototube both prove flame in the boiler by sensing blank.
Heat
Plasma
Thermal waves
Visible light
Visible light
Rectifying phototubes and lead sulfide phototubes are both types of photodetectors that can sense and detect light. In the context of the question, they are used to prove the presence of a flame in the boiler. Since flames emit visible light, these phototubes are able to detect and sense this visible light, indicating the presence of a flame. Therefore, the correct answer is visible light.
There are _________ BTU’s per gallon and _______________ BTU’s per pound of #4 fuel oil.
34.5; 970.3
146,000; 18,840
134,350; 19,720
1,000; 8,330
4 fuel oil has 146,000 BTUs per gallon and 18,840 BTUs per pound.
146,000; 18,840
A reciprocating pump has a water cylinder that is 18” diameter and 15” long, the plunger in the cylinder stroke ¾ of the length of the cylinder. What is the volume of water displaced with each stroke of the plunger?
2,861.325 cu”
3,576.66 cu”
4050 cu”
3,037.5 cu”
2,861.325 cu”
The volume of water displaced with each stroke of the plunger can be calculated using the formula for the volume of a cylinder, which is V = πr²h. In this case, the diameter of the cylinder is given as 18”, so the radius is half of that, which is 9”. The length of the cylinder is given as 15”. The plunger stroke is given as ¾ of the length of the cylinder, which is 15” x ¾ = 11.25”. Using these values, we can calculate the volume as V = π(9²)(11.25) = 2,861.325 cu”.
_______________ are added to the boiler to prevent steam line and condensate line corrosion. These chemicals are used because they will boil-off with the steam.
Amines
Phosphates
Oxygen Scavengers
Nitrates
Amines
Amines are added to the boiler to prevent steam line and condensate line corrosion. These chemicals are used because they will boil-off with the steam.
The presence of __________ ______________ in the flue gas in an indication of incomplete combustion.
Nitrogen
Sulfuric acid
Carbon monoxide
Oxygen
Carbon monoxide
Carbon monoxide is produced during incomplete combustion, where there is insufficient oxygen available to fully burn the fuel. The presence of carbon monoxide in the flue gas is therefore an indication that the combustion process was not complete. Incomplete combustion can lead to the release of harmful pollutants and can also result in lower energy efficiency.
A turbine pump uses a __________ __________ to convert velocity to pressure energy.
Impeller
Volute
Guide vanes
Propeller
Guide vanes
A turbine pump uses guide vanes to convert velocity to pressure energy. Guide vanes are stationary vanes that direct the flow of fluid into the impeller, which then converts the velocity of the fluid into pressure energy. The guide vanes help to control and direct the flow of fluid, ensuring efficient conversion of velocity to pressure.
When water is entrained in the steam it is called ___________ due to high steam flow rates.
Water hammer
Slugging
Priming
Entraintment
Priming
Priming is the correct answer because when water is entrained in the steam due to high steam flow rates, it is referred to as priming. Priming occurs when water droplets are carried along with the steam and can cause damage to equipment and decrease system efficiency.
Anthracite coal is very hard, has a high percentage of _________ ________.
Fixed carbon
Volatile moisture
Heating potential
Volatile combustibles
Fixed carbon
Anthracite coal is known for its high percentage of fixed carbon. Fixed carbon refers to the carbon content in coal that remains after volatile matter and moisture have been removed. This high carbon content contributes to the coal’s heating potential and makes it a valuable fuel source.
In conduction the transfer of heat from one material to another occurs due to direct _________.
Convetion
Contact
Proximity
Touching
Contact
In conduction, the transfer of heat occurs due to direct contact between two materials. When two objects are in contact, heat energy is transferred from the hotter object to the colder object through molecular collisions. This process continues until both objects reach thermal equilibrium, with the heat evenly distributed between them. Therefore, contact is the correct answer as it accurately describes the mechanism of heat transfer in conduction.
The percentage of excess air required to burn coal is about percent.
75
50
25
47
50
The percentage of excess air required to burn coal is about 50 percent. Excess air is the amount of air supplied to a combustion process that exceeds the theoretical requirement for complete combustion. In the case of burning coal, a certain amount of excess air is necessary to ensure complete combustion and prevent the formation of harmful byproducts such as carbon monoxide. A value of 50 percent indicates that half of the air supplied is in excess of what is needed for complete combustion.
Testing coal for moisture, percent volatile matter, fixed carbon, and ash content is a _____________ _____________.
Total analysis
Absolute analysis
Approximate analysis
Proximate analysis
Proximate analysis
Proximate analysis is a method used to determine the composition of coal by testing its moisture, volatile matter, fixed carbon, and ash content. This analysis provides important information about the quality and potential uses of the coal. It helps in understanding its heating value, combustion characteristics, and suitability for different applications. Therefore, the correct answer for this question is proximate analysis.
The hot gases from the furnace pass into a blank lined combustion chamber on a dry back scotch marine boiler.
Refractory
Insulation
Creosote
Concrete
Refractory
In a dry back scotch marine boiler, the hot gases from the furnace enter a combustion chamber. This combustion chamber is lined with refractory material. Refractory is a type of heat-resistant material that can withstand high temperatures without melting or deforming. It is used in boilers to protect the surrounding structure from the extreme heat generated by the combustion process. The refractory lining helps to maintain the efficiency and durability of the boiler by preventing heat loss and minimizing damage to the surrounding components.
The low water fuel cut-off will shut off the fuel to the burner before the water drops below the safe permissible level, and thus prevent ______________ damage to the boiler.
Shear
Pressure
Fire
Overheating
Overheating
The low water fuel cut-off is designed to shut off the fuel supply to the burner when the water level in the boiler drops below a safe level. This prevents overheating of the boiler, which can cause serious damage.
_____ ______ are a potential source of oil contamination of the water side of a boiler.
Water source condensors
Fuel radiators
Zeolite softeners
Oil heaters
Oil heaters
Oil heaters are a potential source of oil contamination of the water side of a boiler. This is because oil heaters are used to heat oil, and if there is any leakage or malfunction in the oil heating system, it can result in oil entering the water side of the boiler. This can lead to contamination of the boiler water, which can negatively impact the efficiency and performance of the boiler. Therefore, it is important to regularly inspect and maintain oil heaters to prevent any oil contamination issues.
The _______________ is the heart of the refrigeration system.
Condesnsor
Evaporator
Compressor
Metering device
Compressor
The compressor is considered the heart of the refrigeration system because it plays a crucial role in the cycle. It is responsible for compressing the refrigerant gas, raising its temperature and pressure. This compressed gas then moves to the condenser where it releases heat and transforms into a high-pressure liquid. Without the compressor, the refrigeration cycle would not be able to function properly as it is responsible for circulating the refrigerant and maintaining the necessary pressure levels.
______________ BTU’s per hour output is one boiler horsepower.
33,475
33,826
66,826
27,475
33,475
One boiler horsepower is equivalent to 33,475 BTU’s per hour output.
_______________ is the transfer of heat from a liquid flowing over the surface of a body.
Radiation
Conduction
Induction
Convection
Convection
Convection is the transfer of heat from a liquid flowing over the surface of a body. This process occurs when the heated liquid comes into contact with the surface, absorbs the heat, and then carries it away as it flows. The movement of the liquid helps to distribute the heat evenly and efficiently.
A low pressure steam boiler must have a ASME ____ stamp.
H
S
M
E
H
A low pressure steam boiler must have an ASME H stamp. This indicates that the boiler is designed and constructed in accordance with the ASME Boiler and Pressure Vessel Code Section IV, which specifically covers low pressure steam heating boilers. The H stamp ensures that the boiler meets the necessary safety standards and regulations for its intended use.
The evaporator receives medium temperature __________ refrigerant.
Liquid
Vapor
Gas
Fluid
Liquid
The evaporator receives medium temperature liquid refrigerant because the purpose of the evaporator is to absorb heat from the surrounding air or water, causing the refrigerant to evaporate and turn into a gas. This heat absorption process is more efficient when the refrigerant is in its liquid state.
The ratio of the maximum fuel input rate and the minimum fuel input rate is known as the blank.
Combustion ratio
Turn down ration
Rate of ideal fuel
Blowback
Turn down ration
The turn down ratio refers to the ratio between the maximum and minimum fuel input rates. This ratio is used to measure the flexibility of a fuel system, as it determines the range of fuel flow that can be achieved. A higher turn down ratio indicates a greater range of fuel flow, allowing for more precise control of the combustion process. Therefore, the turn down ratio is the correct term for the given description.
A High pressure steam boiler must have a ASME ______ stamp.
H
S
M
E
S
A high pressure steam boiler must have an ASME “S” stamp. The ASME “S” stamp indicates that the boiler has been designed, constructed, and inspected in accordance with the ASME Boiler and Pressure Vessel Code Section I, which specifically covers power boilers. This stamp ensures that the boiler meets the necessary safety and quality standards for high pressure steam applications.
When a pump is used to circulate water though a heating system is a __________ ________________ system.
Fancoil unit
Two pipe
Single pipe
Forced convection
Forced convection
When a pump is used to circulate water through a heating system, it creates forced convection. Forced convection refers to the movement of fluid (in this case, water) due to an external force (the pump). The pump forces the water to circulate through the heating system, allowing it to transfer heat and warm the space.
Permanently hard water is water that contains large quantities of calcium and magnesium blank.
Carbonate
Bicarbonate
Nitrites
Sulfites
Sulfites
Permanently hard water is water that contains large quantities of calcium and magnesium sulfites. Sulfites are compounds that can contribute to water hardness and can form insoluble precipitates with calcium and magnesium ions. These precipitates can cause scale buildup in pipes and appliances, reducing their efficiency and lifespan.
The number of tubes in each of the four passes is ____________ to maintain constant ______________ and ________ _______________.
Increased, velocity, heat, transfer
Reduced, velocity, heat, transfer
Reduced, density, heat, exchange
Reduced, velocity, heat, exchange
Reduced, velocity, heat, transfer
In order to maintain constant heat transfer, it is necessary to reduce the velocity of the fluid. This is because reducing the velocity allows for more time for heat exchange to occur between the fluid and the tubes. By reducing the velocity, the fluid can spend more time in contact with the tubes, increasing the efficiency of heat transfer. Therefore, reducing the velocity is necessary to maintain constant heat transfer.
Water hammer is caused by quickly opening a __________ _________. The sudden change in pressure and temperature on the connected piping may cause vibration, noise, or even pipe rupture.
Check valve
Slow-opening valve
Steam valve
Globe valve
Steam valve
Water hammer is caused by quickly opening a steam valve. When a steam valve is rapidly opened, it causes a sudden change in pressure and temperature in the connected piping. This sudden change can lead to vibration, noise, or even pipe rupture.
Fire tube boilers are likely to leak due to cracking, burning and corrosion of the _________ _________.
Stay braces
Stay bolts
Tube ends
Boiler shell
Tube ends
Fire tube boilers are likely to leak due to cracking, burning, and corrosion of the tube ends. The tube ends are the parts of the boiler where the tubes connect to the boiler shell. Over time, the intense heat and pressure in the boiler can cause the tube ends to become weakened and damaged. This can lead to cracks, burning, and corrosion, which can result in leaks in the boiler. Regular maintenance and inspection of the tube ends are necessary to prevent these issues and ensure the safe and efficient operation of the boiler.
1 fuel oil
Light domestic fuel oil is known as ________ ______ _____.
Bunker C
1 fuel oil
Light domestic fuel oil is commonly referred to as #1 fuel oil. This type of fuel oil is lighter in viscosity and has a lower sulfur content compared to other fuel oils. It is commonly used for residential heating purposes and is also known as “kerosene” or “home heating oil”.
A temperature sensor that measures the resistance of a platinum wire at different temperatures is a _______________ _____________________ ____________________.
Thermostatic resitance sensor
Resistance Temperature Sensor
Platinum Wire thermistor
Thermal Wire Interlock
Resistance Temperature Sensor
A temperature sensor that measures the resistance of a platinum wire at different temperatures is called a Resistance Temperature Sensor. This type of sensor relies on the principle that the resistance of a metal, such as platinum, changes with temperature. By measuring the resistance of the wire, the sensor can accurately determine the temperature.
The early watertube boilers followed some fire tube designs, being straight tubes suspended over a furnace with the tubes rolled in two types of headers (1)____________or (2) ______________ ______________.
Box header, sinous header
Barrel header, tube header
Box header, tube header
Sinous header, tube header
Box header, sinous header
The early watertube boilers had straight tubes that were suspended over a furnace. These tubes were rolled into two types of headers: box headers and sinuous headers.
A method for testing the material for soundness without affecting the material physically or chemically is known as ____________________ __________.
Visual inspection
Indirect sampling
Non-destructive testing
Accumulation testing
Non-destructive testing
Non-destructive testing refers to a method of evaluating the quality and integrity of a material without causing any physical or chemical changes to it. This technique allows for the examination of the material’s soundness without causing any damage or alteration. It is commonly used to detect defects, flaws, or abnormalities in various materials, such as metals, composites, and concrete, without compromising their structural integrity. Visual inspection, indirect sampling, and accumulation testing do not accurately describe the process of testing the material without affecting it physically or chemically.
__________ _________ is the temperature at which fuel oil will give off vapor that will ignite when exposed to an open flame.
Flash point
Smoke point
Fire point
Vaporization point
Flash point
The flash point is the temperature at which fuel oil will give off vapor that will ignite when exposed to an open flame.
______________ acid is used to dissolve scale deposits during an acid cleaning.
Hydrochloric
Phosphoric
Sulfuric
Carbonic
Hydrochloric
Hydrochloric acid is commonly used to dissolve scale deposits during an acid cleaning process. It is a strong acid that can effectively break down and remove mineral deposits such as calcium carbonate and limescale. Hydrochloric acid is preferred for this purpose due to its high reactivity and ability to dissolve various types of scales. Additionally, it is readily available and cost-effective, making it a popular choice for acid cleaning applications.
Prior to entering a confined space, the minimum amount of oxygen in the space is _____ percent.
19
20
25
27
19
The correct answer is 19. Prior to entering a confined space, it is important to ensure that there is a sufficient amount of oxygen present. The minimum amount of oxygen required for safe entry into a confined space is typically around 19 percent. Oxygen levels below this can be dangerous and may lead to asphyxiation or other health hazards. Therefore, it is crucial to monitor and confirm the oxygen levels before entering a confined space to ensure the safety of individuals.
