Stationary Engineer Practice Quiz
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Do you wish to be a Stationary Engineer? Get ready to take this quiz on Stationary Engineer Class 3 Examination that is here for you. A compendium of questions that should help with any licensing exam. This quiz is going to be educational and interesting as well at the same time. Would you be able to get a score above 70 on this quiz? You are an expert if you are able to do so. Let's see how well you perform. Best of luck to you!
Questions and Answers
- 1.
- 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"
Correct Answer
A. 2"Explanation
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.Rate this question:
- 2.
- 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
Correct Answer
A. Reciprocating, centrifugal, and rotaryExplanation
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.Rate this question:
- 3.
- 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"
Correct Answer
C. 1/2"Explanation
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.Rate this question:
- 4.
- _____________ is the replacement for refrigerant R-22.
- A.
R-410a
- B.
R-134a
- C.
R-401a
- D.
R-123
Correct Answer
A. R-410aExplanation
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.Rate this question:
- 5.
- 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
Correct Answer
B. 5.3:1Explanation
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.Rate this question:
- 6.
- 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
Correct Answer
B. 75Explanation
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.Rate this question:
- 7.
- Unlike an infrared scanner, the ultraviolet scanner is no affected by the light given off by hot _________________.
- A.
Flames
- B.
Plasma
- C.
Refractories
- D.
Gasses of combustions
Correct Answer
C. RefractoriesExplanation
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.Rate this question:
- 8.
- 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
Correct Answer
A. Stack switch and rectifying flame rodExplanation
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.Rate this question:
- 9.
- A _______________ ____________ air handler unit operates at the rated capacity at all times.
- A.
Variable Volume
- B.
Constant Volume
- C.
Single Zone
- D.
Multi-Zone
Correct Answer
B. Constant VolumeExplanation
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.Rate this question:
- 10.
- 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%
Correct Answer
B. 2%Explanation
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.Rate this question:
- 11.
- 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
Correct Answer
A. MoistureExplanation
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.Rate this question:
- 12.
- 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
Correct Answer
C. Manual reset; operatingExplanation
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.Rate this question:
- 13.
- An ___________________ Ring is on method used to support the Morrison Tube in a Scotch Marine Boiler.
- A.
Adamson
- B.
Morrison
- C.
Smithers
- D.
Faulkner
Correct Answer
A. AdamsonExplanation
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.Rate this question:
- 14.
- 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
Correct Answer
A. 10, 5, 15Explanation
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.Rate this question:
- 15.
- 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
Correct Answer
B. Outside Screw and YolkExplanation
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.Rate this question:
- 16.
- A centrifugal pump uses a ________ to convert velocity energy to pressure energy.
- A.
Impeller
- B.
Volute
- C.
Guide vanes
- D.
Propeller
Correct Answer
B. VoluteExplanation
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.Rate this question:
- 17.
- 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"
Correct Answer
A. 39.87'Explanation
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.Rate this question:
- 18.
- A ________ _______ AHU supplies conditioned air to only one area of the building.
- A.
Variable Volume
- B.
Constant Volume
- C.
Single Zone
- D.
Multi Zone
Correct Answer
C. Single ZoneExplanation
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.Rate this question:
- 19.
- 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"
Correct Answer
C. 1"Explanation
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.Rate this question:
- 20.
- The two types of electric boilers are _______________ and ______________.
- A.
Resistance & electrode
- B.
Resistance & capacitance
- C.
Arc Tube & electrode
- D.
Electrode & capacitance
Correct Answer
A. Resistance & electrodeExplanation
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.Rate this question:
- 21.
- 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
Correct Answer
B. Latent Heat of vaporizationExplanation
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.Rate this question:
- 22.
- ______ ________________ 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
Correct Answer
A. Soot BlowersExplanation
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.Rate this question:
- 23.
- ______________ 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
Correct Answer
B. HydrazineExplanation
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.Rate this question:
- 24.
- 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
Correct Answer
C. 160PSI, 250Deg.FExplanation
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.Rate this question:
- 25.
- The waste products from a sugar cane are used in a _______________ plant.
- A.
Bagasse
- B.
Black liquor
- C.
Red liquor
- D.
Saccarine refinery
Correct Answer
A. BagasseExplanation
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.Rate this question:
- 26.
- ______________ 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
Correct Answer
C. CreepExplanation
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.Rate this question:
- 27.
- Cogeneration plants sell ____________ to the local industrial plants, and _____________ to the local __________.
- A.
Fuel oil, steam, power plants
- B.
Steam, condensate, cogeners
- C.
Propane, fuel oil, utilities
- D.
Steam, electricity, utilities
Correct Answer
D. Steam, electricity, utilitiesExplanation
Cogeneration plants sell steam and electricity to the local utilities.Rate this question:
- 28.
- 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. 50Explanation
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.Rate this question:
- 29.
- 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
Correct Answer
D. Multi ZoneExplanation
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.Rate this question:
- 30.
- 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
Correct Answer
D. Steam, soda ashExplanation
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.Rate this question:
- 31.
- Number 4 fuel oil has _____________btu’s per pound.
- A.
19,720
- B.
19,657
- C.
22,475
- D.
18,840
Correct Answer
D. 18,840Explanation
Number 4 fuel oil has 18,840 btu's per pound.Rate this question:
- 32.
- 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
Correct Answer
C. Reground, tightenedExplanation
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.Rate this question:
- 33.
- Hardness is a measure of the ____________ and _______________ ions in solution.
- A.
Calcium, bicarbonate
- B.
Calcium, sulphate
- C.
Calcium, magnesium
- D.
Carbonate, bicarbonate
Correct Answer
C. Calcium, magnesiumExplanation
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.Rate this question:
- 34.
- 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
Correct Answer
A. 10-20Explanation
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.Rate this question:
- 35.
- A dual Duct AHU has hot and cold Ducts connected to ___________ _______.
- A.
Supply Duct
- B.
Return Duct
- C.
VAV BOX
- D.
Mixing Box
Correct Answer
D. Mixing BoxExplanation
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 for precise control over the temperature of the supplied air.Rate this question:
- 36.
- 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
Correct Answer
A. 55Explanation
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.Rate this question:
- 37.
- 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
Correct Answer
B. Induction nozzlesExplanation
An induction AHU (Air Handling Unit) 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.Rate this question:
- 38.
- 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
Correct Answer
D. 2Explanation
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.Rate this question:
- 39.
- Galvanic corrosion occurs when ______________, metals are in direct contact with each other in a _______________ environment.
- A.
Similar, humid
- B.
Similar, conductive
- C.
Disimilar, humid
- D.
Disimilar, conductive
Correct Answer
D. Disimilar, conductiveExplanation
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.Rate this question:
- 40.
- A stay that is shorter than 8” and threaded is required to have a blank
- A.
Tell tale hole
- B.
Stay brace
- C.
Riveted connection
- D.
Bolt brace
Correct Answer
A. Tell tale holeExplanation
A stay that is shorter than 8" and threaded is required to have a tell tale hole.Rate this question:
- 41.
- A ___________ Pump is a Positive Displacement Pump.
- A.
Centrifugal
- B.
Duplex
- C.
Rotary
- D.
Reciprocating
Correct Answer
D. ReciprocatingExplanation
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.Rate this question:
- 42.
- 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, fartherst
Correct Answer
A. Non-return valve, closestExplanation
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.Rate this question:
- 43.
- A slow opening blowdown valve must complete _____ turns between full open and full shut.
- A.
3
- B.
2
- C.
5
- D.
4
Correct Answer
C. 5 - 44.
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
Correct Answer
B. Steam boundExplanation
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.Rate this question:
-
- 45.
- One grain is equal to ________ parts per million.
- A.
17.1
- B.
18.5
- C.
10
- D.
33.3
Correct Answer
A. 17.1Explanation
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.Rate this question:
- 46.
- 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
Correct Answer
C. Backwash, Brine Rinse, slow / fast rinse, back in serviceExplanation
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.Rate this question:
- 47.
- A solid that precipitates out of solution and adhere to the boiler heating surfaces is called__________.
- A.
Scale
- B.
Precipitant
- C.
Crust
- D.
Embrittlement
Correct Answer
A. ScaleExplanation
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.Rate this question:
- 48.
- 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 bicabonate
- C.
Activated carbon
- D.
Ion exchange
Correct Answer
A. ZeoliteExplanation
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.Rate this question:
- 49.
- The color of Cylinder containing R-11 is _________ before 2020.
- A.
Orange
- B.
White
- C.
Light Green
- D.
Coral Red
Correct Answer
A. OrangeExplanation
The color of the cylinder containing R-11 is orange before 2020.Rate this question:
- 50.
- A ____________________ pump can be started with the discharge valve shut.
- A.
Centrifugal
- B.
Rotary
- C.
Reciprocating
- D.
Simplex
Correct Answer
A. CentrifugalExplanation
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.Rate this question:
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Apr 22, 2024Quiz Edited by
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Jan 18, 2018Quiz Created by
Mike Jewel
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