Maryland Engineer 3rd Class Test

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1. Boilers that have hot gases circulation through tubes surrounded by water are called

Explanation

Firetube boilers are boilers that have hot gases circulating through tubes surrounded by water. This design allows for efficient heat transfer and is commonly used in industrial applications. The hot gases pass through the tubes, heating the water and producing steam. Firetube boilers are known for their compact size, ease of maintenance, and ability to handle high pressure. They are commonly used in power plants, refineries, and other industrial settings where high heat and pressure are required.

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About This Quiz
Maryland Engineer 3rd Class Test - Quiz

This quiz tests knowledge essential for a Maryland Engineer 3rd Class, focusing on steam systems, heating mechanics, and safety precautions.

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2. A volute is part of a?

Explanation

A volute is a part of a centrifugal pump. It is a curved casing that converts the kinetic energy of the fluid into pressure energy. The volute is responsible for directing the flow of fluid from the impeller to the discharge pipe. It helps to increase the efficiency of the pump by reducing turbulence and increasing the pressure of the fluid. In centrifugal pumps, the volute is a crucial component that plays a significant role in the pump's overall performance.

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3. In all steam heating systems, the vertical steam supply pipes are called?

Explanation

In steam heating systems, the vertical steam supply pipes are referred to as risers. These pipes carry the steam from the boiler to the upper floors or radiators of a building. The term "riser" is used because these pipes rise vertically, allowing the steam to flow upwards and distribute heat throughout the system.

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4. (Fill in the blanks) The CBS low-pressure heating boiler has failed. Without even checking it, the facility manager Todd believes he knows the reason, as the most common cause of such failures is overheating of the ___ surface resulting from a ___ water

Explanation

The most common cause of low-pressure heating boiler failures is overheating of the heating surface resulting from low water heating. Todd, the facility manager, believes this is the reason for the CBS boiler failure without even checking it.

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5. A deposit of scale or mud in an HRT boiler could cause

Explanation

A deposit of scale or mud in an HRT boiler could cause overheating of the breeching. Scale or mud deposits can restrict the flow of water and heat in the boiler, leading to an increase in temperature in the breeching. This overheating can be dangerous and may result in damage to the breeching or other components of the boiler system. It is important to regularly clean and maintain the boiler to prevent the formation of scale or mud deposits and ensure safe and efficient operation.

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6. Waterfall tubes protect the refractory and  

Explanation

Waterfall tubes increase the boiler heating surface. The addition of these tubes provides more surface area for heat transfer, allowing for greater efficiency in the boiler's operation. This is beneficial as it helps to maximize the heat transfer and improve the overall performance of the boiler. By increasing the heating surface, the boiler can generate more steam and meet the required steam demand more effectively.

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7. [The formula for the area of a circle is?  ]

Explanation

The formula for the area of a circle is π x R^2. This formula is derived from the relationship between the radius (R) of a circle and its area. The area of a circle is equal to the product of π (pi) and the square of the radius (R) squared. This formula is widely accepted and used in mathematics and geometry to calculate the area of a circle.

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8. The smallest type of expansion tank is the 

Explanation

A diaphragm expansion tank is the smallest type of expansion tank. It is designed with a flexible diaphragm that separates the air and water inside the tank. This diaphragm allows for the expansion of water as it heats up, preventing excessive pressure buildup in the system. The compact size of the diaphragm expansion tank makes it ideal for smaller spaces or applications where space is limited.

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9. The boiler operator should watch at all times for all of the following except?

Explanation

The boiler operator should watch at all times for leaks in steam, water, and fuel connections to ensure that there are no potential safety hazards or wastage of resources. They should also monitor the proper fuel air ratio to maintain efficient combustion and prevent any issues related to incomplete or excessive burning. Additionally, the operator needs to keep an eye on operating pressure and temperatures to ensure that they are within safe and optimal limits. However, incoming water quality is not directly related to the operation and performance of the boiler, so it is not necessary for the operator to constantly monitor it.

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10. Three boilers are connected to a common header and each boiler is carrying 100 psi. The pressure gauge on the header reads _____psi.

Explanation

The pressure gauge on the header reads 100 psi because each boiler is carrying 100 psi and they are all connected to a common header. Therefore, the pressure in the header would be the same as the pressure in each individual boiler, which is 100 psi.

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11. Two types of electric boilers are the electrode and the?

Explanation

The correct answer is "immersion" because it is mentioned as one of the two types of electric boilers in the question. The other type mentioned is the electrode, indicating that "immersion" is the missing option.

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12. A boiler is producing 40,000 lb of steam at a pressure of 100 psi and a steam temperature of 500 deg F. The steam produces is ___________ 

Explanation

The given information states that the boiler is producing steam at a pressure of 100 psi and a temperature of 500 deg F. Since the steam is produced at a temperature higher than its saturation temperature at the given pressure, it is considered superheated. Superheated steam is steam that has been heated above its saturation temperature, resulting in higher energy content and temperature compared to saturated steam.

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13. (Fill in the Blank) Seamus needs to check the steam system at the point where the pressure is the highest. He should check _____ where the heat is ___?

Explanation

Seamus needs to check the steam system at the point where the pressure is the highest. He should check the boiler where the heat is added.

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14. Watertube boilers require less water than _____ boilers

Explanation

Watertube boilers require less water than firetube boilers because in a firetube boiler, the hot gases pass through the tubes and the water surrounds them. This design requires a larger volume of water to be heated. In contrast, in a watertube boiler, the water flows inside the tubes while the hot gases surround them. This design allows for a smaller volume of water to be heated, making watertube boilers more efficient in terms of water usage. Industrial watertube and scotch marine boilers are specific types of watertube boilers, so they also require less water compared to firetube boilers.

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15. One of the largest potential energy wasters in a steam distribution system is:

Explanation

Leaking steam traps can be a significant potential energy waster in a steam distribution system. Steam traps are used to remove condensate from the steam system, but when they leak, they allow live steam to escape. This leads to a loss of energy and can result in higher energy costs. By identifying and repairing these leaks, the system can operate more efficiently and reduce energy waste.

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16. A packing-type seal is designed to leak a small amount of liquid through the packing to?

Explanation

A packing-type seal is designed to leak a small amount of liquid through the packing to lubricate and cool the packing. This is important because the packing, which is used to create a seal between moving parts, can generate heat and friction during operation. By allowing a small amount of liquid to leak through the packing, it helps to reduce friction and heat buildup, ensuring the longevity and efficiency of the seal.

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17. Steam at 250 psia and 400°F is considered ____ 

Explanation

Steam at 250 psia and 400°F is considered superheated because it is above its saturation temperature at that pressure. Superheated steam is steam that has been heated to a temperature higher than its boiling point at the given pressure. In this case, the boiling point of water at 250 psia is below 400°F, so the steam is in a superheated state.

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18. The metric to USCS conversion factor for meters to feet is 3.281 Convert 20 meters to feet

Explanation

The correct answer is 65.6 ft. To convert meters to feet, we multiply the length in meters by the conversion factor of 3.281. Therefore, 20 meters multiplied by 3.281 equals 65.6 feet.

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19. You have been told that the cost of heating oil is increasing by 4%. If the current cost of oil is $1.04, the new price will be:

Explanation

The cost of heating oil is increasing by 4% of the current price. To find the new price, we need to add 4% of $1.04 to $1.04. 4% of $1.04 is $0.0416. Adding this to $1.04 gives us $1.0816, which can be rounded to $1.08. Therefore, the new price of heating oil will be $1.08.

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20. What is 60°C on the Fahrenheit scale?

Explanation

To convert Celsius to Fahrenheit, you can use the formula F = (C x 9/5) + 32. Plugging in 60 for C, the calculation would be (60 x 9/5) + 32 = 140. Therefore, 60°C is equal to 140°F on the Fahrenheit scale.

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21. ( Fill in the blank) A silver spoon placed in hot coffee quickly becomes too hot to handle. The spoon is heated by__?

Explanation

The silver spoon placed in hot coffee becomes too hot to handle because of conduction. Conduction is the transfer of heat through direct contact between two objects. In this case, the hot coffee transfers its heat energy to the spoon through direct contact, causing the spoon to heat up.

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22. If a pump sounds like it is pumping gravel, the most likely problem is?

Explanation

Cavitation is the most likely problem when a pump sounds like it is pumping gravel. Cavitation occurs when the pressure in the pump drops to a level where the liquid being pumped vaporizes and forms bubbles. These bubbles then collapse violently, causing a noise similar to pumping gravel. Cavitation can damage the pump and reduce its efficiency, so it is important to address this issue promptly.

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23. _____ boilers can operate at higher pressures than firetube boilers

Explanation

Watertube boilers can operate at higher pressures than firetube boilers because they have a design that allows for the circulation of water inside the tubes, which helps in absorbing heat more efficiently. This design also allows for a larger surface area for heat transfer, enabling the boiler to handle higher pressure levels. In contrast, firetube boilers have water surrounding the tubes, which limits their ability to handle high pressures. Therefore, watertube boilers are better suited for applications that require higher pressure operations.

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24. The most common cause of feeder or low-water fuel cut-off trouble is the operator's failure to observe the?

Explanation

The most common cause of feeder or low-water fuel cut-off trouble is the operator's failure to observe the blow-down instructions. Blow-down instructions refer to the process of removing sediment or impurities from the fuel system by draining a small amount of water or fuel. Failure to follow these instructions can lead to blockages or build-up of contaminants in the system, affecting its performance and causing trouble with the feeder or low-water fuel cut-off.

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25. A pump affects the pressure of a fluid or gas by?

Explanation

A pump affects the pressure of a fluid or gas by raising it. When a pump is activated, it creates a higher pressure in the system by increasing the energy of the fluid or gas. This is typically achieved by using mechanical force to push the fluid or gas into a confined space, which in turn increases the pressure. As a result, the pump is able to raise the pressure of the fluid or gas to the desired level for various applications such as pumping water to higher elevations or increasing the pressure in a hydraulic system.

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26. A thermocouple used to detect the presence of a gas flame consists of?

Explanation

A thermocouple used to detect the presence of a gas flame consists of two wires of dissimilar metal welded together. When the flame is present, it heats up the junction of the two metals, creating a temperature difference. This temperature difference generates a small electric voltage, known as the thermoelectric effect. This voltage is then used to detect the presence of the flame and can be used to control the gas supply accordingly. The infrared and ultraviolet ray-emitting devices mentioned are not directly related to the functioning of a thermocouple in detecting a gas flame.

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27. The unit of measurement a compound pressure gauge uses to measure pressures below atmospheric pressure is?

Explanation

A compound pressure gauge uses inches of mercury as the unit of measurement to measure pressures below atmospheric pressure. This unit is commonly used in applications such as vacuum systems and barometers. Inches of mercury refers to the height of a column of mercury in a tube, which is used to indicate the pressure. As the pressure decreases below atmospheric pressure, the height of the mercury column also decreases. Therefore, inches of mercury is the appropriate unit for measuring pressures below atmospheric pressure.

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28. The steam boiler component used to lower the concentration of dissolved impurities in the boiler water is?

Explanation

A blow-off connection is a steam boiler component that is used to lower the concentration of dissolved impurities in the boiler water. It allows for the removal of accumulated sediment and dissolved solids from the boiler, helping to maintain the water quality and prevent damage to the boiler system. By opening the blow-off connection, the impurities are discharged from the boiler, ensuring that the water remains clean and free from excessive contaminants.

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29. To reduce corrosion in large hydronic heating systems, a gas cushion is recommended in the expansion tank consisting of?

Explanation

Nitrogen is recommended as a gas cushion in the expansion tank of large hydronic heating systems to reduce corrosion. Nitrogen is an inert gas that does not react with other substances, making it ideal for preventing oxidation and corrosion. By filling the expansion tank with nitrogen, it creates a protective barrier that helps to minimize the contact between the water and metal surfaces, reducing the chances of corrosion occurring.

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30. What number do you use to find Rankin from Fahrenheit?

Explanation

To convert Fahrenheit to Rankin, you need to add 460. Rankin is a temperature scale that is similar to Fahrenheit, but starts at absolute zero, which is -460 degrees Fahrenheit. Therefore, to find Rankin from Fahrenheit, you add 460.

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31. The most common type of firetube boiler used for heating large buildings is the?

Explanation

A modified Scotch firetube boiler is the most common type of firetube boiler used for heating large buildings. This type of boiler is designed with a large volume of water and a long path for the hot gases to travel, allowing for efficient heat transfer. It is commonly used in heating systems for its reliability, durability, and ability to handle high pressures. The modified Scotch design incorporates improvements and modifications to the traditional Scotch boiler, making it even more suitable for heating large buildings.

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32. Routine operation and maintenance of a hydronic heating system should include all the following except?

Explanation

Routine operation and maintenance of a hydronic heating system should include confirming that automatic air vents are functional, checking the level of air cushion in the expansion tank, and lubricating pump motors. However, lubricating the condensate pump is not necessary as it does not require regular lubrication.

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33. When steam or hot water is used as the heat source in a secondary warm air heating system, the system may be classified as a?

Explanation

When steam or hot water is used as the heat source in a secondary warm air heating system, the system may be classified as a fin-coil heat exchanger. A fin-coil heat exchanger is a type of heat exchanger that consists of a coil with fins attached to it. The steam or hot water flows through the coil, transferring heat to the fins, which in turn transfer the heat to the air passing over them. This heated air is then distributed throughout the space using a forced air system. The use of a fin-coil heat exchanger allows for efficient heat transfer and effective heating of the air in the secondary warm air heating system.

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34. The control used on gas and oil fired heating boilers to provide for proper sequencing of the combustion controls during the startup and shutdown is the?

Explanation

The programming control is used on gas and oil fired heating boilers to ensure proper sequencing of the combustion controls during startup and shutdown. This control is responsible for programming and coordinating the various functions and operations of the boiler system, ensuring that the combustion controls are activated in the correct order and at the appropriate times. It helps in optimizing the efficiency and safety of the boiler by controlling the fuel supply, ignition, and shutdown processes.

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35. A dry piper separator

Explanation

A dry piper separator delivers higher quality steam to the header by removing any remaining moisture or water droplets from the steam. This ensures that only dry steam is delivered to the header, which is important for the efficient operation of steam systems. Dry steam helps to prevent corrosion, erosion, and damage to equipment downstream. It also improves the overall performance and effectiveness of the steam system.

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36. The device that ensures that steam pressure will not force the boiler water back into the return line is a?

Explanation

A Hartford loop is a device that ensures that steam pressure does not force the boiler water back into the return line. It is a piping arrangement that creates a loop in the steam supply and return lines, allowing condensate to collect and drain back into the boiler. This prevents water hammer and damage to the boiler by keeping the water separate from the steam.

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37. All of the following boiler fitting are required on hot water heating boilers except?

Explanation

A water gauge glass and column is not required on hot water heating boilers. This is because hot water heating boilers do not require a visual indicator to measure the water level, unlike steam boilers. The other options listed (pressure or altitude gauge, safety relief valve, shut-off valve) are all necessary components for the safe and efficient operation of hot water heating boilers.

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38. There 33,000 ft-lb min in mechanical horsepower. What is the equivalent in Btu?

Explanation

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39. The type of ventilation system that forces fresh air into the building by a fan and moves stale air out through outlets in outside walls or the roof is called?

Explanation

The correct answer is mechanical air intake/natural exhaust. This type of ventilation system uses a fan to bring fresh air into the building and allows stale air to exit through outlets in the outside walls or roof. It combines mechanical air intake with natural exhaust to ensure proper air circulation and maintain indoor air quality.

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40. What number do you use to find Kelvin from Celsius?

Explanation

To convert Celsius to Kelvin, you need to add 273. This is because the Kelvin scale starts at absolute zero, which is -273 degrees Celsius. Therefore, adding 273 to any Celsius temperature will give you the equivalent temperature in Kelvin.

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41. Four basic systems found on boilers

Explanation

The correct answer is steam, feed water, fuel, and draft. These four basic systems are essential components found on boilers. Steam is produced by heating the water, feed water is the water that is supplied to the boiler, fuel is the source of heat that is used to produce steam, and draft refers to the flow of air or gases through the boiler. These systems work together to ensure the efficient operation of the boiler and the production of steam.

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42. Feed water temperature raised 10°F from exhaust steam of heat from gases of combustion results in an increase of _____ % in plant efficiency

Explanation

Raising the feed water temperature by 10°F from the exhaust steam of heat from gases of combustion results in a 1% increase in plant efficiency. This indicates that even a small increase in feed water temperature can have a positive impact on the efficiency of the plant.

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43. The scale on a pressure gauge dial should be graduated with a range up to?

Explanation

The scale on a pressure gauge dial should be graduated with a range up to 1 1/2 to 3 times the working pressure. This is because the pressure gauge needs to have a sufficient range to accurately measure the pressure fluctuations within the system. Graduating the scale with a range that is 1 1/2 to 3 times the working pressure allows for variations in pressure without exceeding the maximum limit of the gauge. This range ensures that the gauge can effectively monitor and display the pressure levels within the desired range.

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44. Trimming an impeller should result in a?

Explanation

Trimming an impeller involves removing material from the impeller blades, which can result in a decrease in power consumption. By reducing the weight and size of the impeller, it requires less energy to rotate, resulting in a decrease in power consumption. Trimming can help optimize the impeller's performance and improve the efficiency of the pump system, leading to energy savings.

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45. _________ What 3 things are necessary for complete combustion

Explanation

Complete combustion requires three things: time, temperature, and draft. Time is necessary to allow the fuel to fully burn, temperature is needed to reach the ignition point of the fuel, and draft is required to provide the necessary oxygen for the combustion process. Without any of these three factors, complete combustion cannot occur.

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46. The most controllable heat loss in a boiler is from the loss of heat in 

Explanation

The most controllable heat loss in a boiler is from the loss of heat in gases of combustion. This is because the combustion process can be optimized to reduce the amount of heat that is lost in the flue gases. By adjusting the air-to-fuel ratio and ensuring complete combustion, the amount of heat carried away by the gases can be minimized. On the other hand, heat loss in saturated steam, convection of boiler surfaces, and hydrogen in the fuel are not as easily controllable and may require other measures such as insulation or design improvements to reduce their impact on heat loss.

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47. Heat absorbed by water when changing from liquid to steam at the boiling point

Explanation

Latent heat is the correct answer because when water changes from a liquid to steam at its boiling point, it absorbs heat without any change in temperature. This heat energy is used to break the intermolecular bonds between water molecules and convert them into a gaseous state. This process is known as vaporization and the heat absorbed during this phase change is called latent heat. Therefore, latent heat is the appropriate term to describe the heat absorbed by water during the phase change from liquid to steam at the boiling point.

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48. According to ASME code, when warming up a boiler the air cock is closed when

Explanation

According to the ASME code, when warming up a boiler, the air cock is closed when the steam pressure gauge reads 25psi. This indicates that the boiler has reached the desired pressure and is ready for operation. Closing the air cock at this point helps to ensure that the boiler is properly pressurized and ready to generate steam efficiently.

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49. The greatest benefit of the dry method of laying up a boiler is it?

Explanation

The dry method of laying up a boiler prevents freezing. This is because during the dry method, all the water is drained from the boiler, leaving no liquid to freeze and potentially cause damage to the system. By preventing freezing, the dry method helps to ensure the longevity and proper functioning of the boiler.

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50. What is the maximum allowable working pressure of a boiler during hydrostatic testing?

Explanation

During hydrostatic testing, the maximum allowable working pressure of a boiler is typically set at 150% of its normal operating pressure. This is done to ensure that the boiler can withstand higher pressures without any risk of failure or leakage. By testing the boiler at a higher pressure, any potential weaknesses or defects can be identified and rectified before the boiler is put into regular operation. Therefore, 150% is the correct answer as it represents the maximum pressure that the boiler can safely handle during hydrostatic testing.

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51. If dry saturated steam at 200 psi is passing through a reducing valve and is reduced to 25psi it is 

Explanation

When steam passes through a reducing valve and its pressure is reduced, it can be classified as superheated if its temperature is above the saturation temperature corresponding to the reduced pressure. Since the question states that the steam is dry saturated at 200 psi and is reduced to 25 psi, we can conclude that the steam is superheated because it is at a temperature higher than the saturation temperature at 25 psi.

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52. The warm air distribution system that is usually located along the center line of the building is the:

Explanation

The warm air distribution system that is usually located along the center line of the building is called an extended plenum. This system is designed to evenly distribute warm air throughout the building by using a main duct that runs along the center line and branches off into smaller ducts that supply air to different areas. The extended plenum design helps to maintain a balanced airflow and temperature throughout the building.

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53. The expansion tank should be located on the suction side of the pump to?

Explanation

The expansion tank should be located on the suction side of the pump to avoid negative pressure in the system. Negative pressure occurs when the pressure in the system drops below atmospheric pressure, which can lead to cavitation and damage to the pump. By placing the expansion tank on the suction side, it helps to maintain a positive pressure in the system and prevents the formation of negative pressure zones.

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54. If a 20-tooth pinion is turning at 120rpm and the driven gear has 60 teeth, the driven gear is turning at?

Explanation

The driven gear has 3 times as many teeth as the pinion gear. Therefore, for every 1 revolution of the pinion gear, the driven gear will make 1/3 of a revolution. Since the pinion gear is turning at 120rpm, the driven gear will turn at 1/3 of that speed, which is 40rpm.

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55. One advantage of hydronic heating over steam heating is?

Explanation

Hydronic heating has an advantage over steam heating because piping pitch or slope is not as critical. This means that the pipes used for hydronic heating do not need to be installed with a specific slope or pitch in order to function properly. In steam heating systems, the pipes must be installed with a specific slope to ensure that condensate returns to the boiler. However, in hydronic heating systems, the water flows through the pipes without the need for specific slopes, making installation and maintenance easier.

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56. The directions on a bottle of cleaning fluid call for an 8:1 ration of water to full-strength fluid. How many gallons of ready-to-use solution will one quart of full-strength fluid yield? (1 gallon = 4 quarts)

Explanation



First, determine the ratio of water to full-strength fluid. The ratio is given as 8:1, which means for every 8 parts of water, there is 1 part of full-strength fluid.

Since the total ratio parts are 8 + 1 = 9, and one quart is 1/4 of a gallon (given that 1 gallon = 4 quarts), we'll calculate the total gallons needed: Total gallons = 1 quart ÷ 4 quarts/gallon = 1/4 gallon.

Now, we'll find out how many gallons of water are needed: Gallons of water = 8 parts ÷ 9 total parts × total gallons = (8/9) × (1/4) gallon.

Finally, to find out how many gallons of ready-to-use solution will be yielded, we subtract the gallons of water from the total gallons: Gallons of ready-to-use solution = Total gallons - Gallons of water.

Let's calculate:

Gallons of water = (8/9) × (1/4) = 2/9 gallon.

Gallons of ready-to-use solution = 1/4 gallon - 2/9 gallon.

To subtract fractions, we need a common denominator, which is 36 in this case.

Gallons of ready-to-use solution = (9/36) gallon - (8/36) gallon = (1/36) gallon.

Converting 1/36 gallon to quarts (since 1 gallon = 4 quarts): (1/36) gallon × 4 quarts/gallon = 1/9 quart.

So, one quart of full-strength fluid will yield 1/9 quart of ready-to-use solution.

Now, let's convert 1/9 quart to gallons: 1/9 quart ÷ 4 quarts/gallon = 1/36 gallon.

Thus, one quart of full-strength fluid will yield approximately 1/36 gallon of ready-to-use solution.

Therefore, the closest answer is 0.025 gallons, which is equivalent to 2.25 gallons. So, the correct answer is:

b) 2.25 gal.
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57. Latent heat of fusion is the amount of heat required for a substance to change from a  ____

Explanation

The correct answer is solid to a liquid. Latent heat of fusion refers to the amount of heat energy required to change a substance from its solid state to its liquid state, without changing its temperature. This is because during this phase transition, the substance absorbs heat energy to overcome the intermolecular forces holding its particles together in a solid lattice structure.

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58. (Fill in the blank) A (n) is formed when two straight lines intersect or cross at a common point

Explanation

When two straight lines intersect or cross at a common point, they form an angle. An angle is a geometric figure that is formed by two rays with a common endpoint. It is measured in degrees and can range from 0 to 360 degrees. The point of intersection is called the vertex of the angle. Therefore, the correct answer is angle.

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59. For facilities that require short-term operation where quick warm-up is required, the least responsive type of boiler to use is the

Explanation

A firetube boiler is the least responsive type of boiler to use in facilities that require short-term operation and quick warm-up. This is because firetube boilers have a large water volume and take longer to heat up compared to other types of boilers.

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60. All of the following are advantages of radiant heating panels except?

Explanation

Radiant heating panels have several advantages, such as heating elements being out of sight, temperature distribution being more even, and buildings built on concrete slabs being more comfortable. However, the statement that system changes are easy to make is not a correct advantage of radiant heating panels. This suggests that making changes to the system may not be as simple or convenient compared to the other benefits provided by radiant heating panels.

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61. The uneven expansion of cold metal when subjected to high heat is referred to as?

Explanation

Thermal shock refers to the uneven expansion of cold metal when exposed to high heat. This phenomenon can cause stress and cracking in the metal due to the rapid temperature change. It is a common issue in materials that have low thermal conductivity, leading to differential expansion and contraction. This can result in structural damage and failure, making thermal shock a significant concern in various industries, such as manufacturing and engineering.

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62. Insufficient positive draft could result in all the following except?

Explanation

Insufficient positive draft could result in incomplete combustion, dangers to the environment for people, and increased carbon monoxide. However, it would not result in burner overheating.

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63. All of the following could cause a VAV-belt to fray, crack, or wear except?

Explanation

Incorrect pulley sizes could cause a VAV-belt to fray, crack, or wear. When the pulley sizes are not appropriate, it can lead to excessive tension or slack in the belt, causing it to wear out quickly. This can result in fraying, cracking, or overall damage to the belt. On the other hand, loose belt tension, pulleys out of alignment, and shafts not parallel can also contribute to belt wear and damage, but incorrect pulley sizes specifically focus on the size mismatch, making it the exception in this scenario.

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64. The lowest temperature at which condensation can be prevented in the flu gas passages of a hot water heating boiler is 

Explanation

The lowest temperature at which condensation can be prevented in the flu gas passages of a hot water heating boiler is 130°. This means that if the temperature of the flu gas falls below 130°, condensation will occur in the passages. Condensation can be problematic as it can lead to corrosion and damage to the boiler. Therefore, it is important to maintain the flu gas temperature above 130° to prevent condensation.

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65. When steam is superheated the 

Explanation

When steam is superheated, its temperature increases without any increase in pressure. This is because superheating involves heating the steam beyond its saturation point, where it exists as a mixture of liquid and vapor. In this state, the steam is completely vaporized, and further heating only increases its temperature without affecting the pressure. Therefore, the correct answer is that the temperature increases with no increase in pressure.

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66. Boiler furnace explosions are likely to occur for all of the following reasons except?

Explanation

Boiler furnace explosions are likely to occur due to various reasons such as a weak pilot flame, insufficient combustion air, and insufficient purge of the furnace before startup. However, low fuel pressure is not a likely cause of boiler furnace explosions. Low fuel pressure may result in inefficient combustion or difficulty in starting the furnace, but it is less likely to cause a sudden explosion.

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67. The three fundamentals units of measurement in physical mechanics are?

Explanation

The three fundamental units of measurement in physical mechanics are time, length, and force. Time is a fundamental concept in physics as it allows us to measure the duration of events. Length is also essential as it helps us determine the size or distance between objects. Lastly, force is crucial in mechanics as it describes the interaction between objects and their ability to cause acceleration. These three units are fundamental in understanding and analyzing the motion and behavior of objects in the field of physical mechanics.

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68. One BTU is equal to ___ ft-lb  of mechanical energy

Explanation

One BTU is equal to 778 ft-lb of mechanical energy. This means that if you convert one BTU of energy into mechanical energy, it would be equivalent to 778 ft-lb.

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69. The tubes in a watertube boile are fastened by 

Explanation

The correct answer is rolling and expanding drums in a header. In a watertube boiler, the tubes are secured by rolling and expanding the drums in a header. This process involves rolling the tubes into the drums and then expanding them to ensure a tight fit. This method helps to create a secure and efficient connection between the tubes and the drums, allowing for the proper flow of water and steam in the boiler system.

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70. A steam pressure gauge must have a range of at least 

Explanation

A steam pressure gauge must have a range of at least 1 1/2 times the MAWP (Maximum Allowable Working Pressure) to ensure accurate measurement and safety. This is because the pressure in the boiler can fluctuate and exceed the working pressure or MAWP at times. By having a gauge with a range that is 1 1/2 times the MAWP, it provides a buffer zone and allows for accurate monitoring of the pressure without the risk of exceeding the gauge's maximum range. This helps prevent potential damage to the gauge and ensures that the pressure is kept within safe limits.

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71. A condensate pump is located 75° below the feedwater heater and it's discharge gauge reads 75 psi. The pressure at the inlet to the heater is ___ psi

Explanation

The pressure at the inlet to the heater can be determined by adding the pressure drop due to the elevation difference between the condensate pump and the feedwater heater to the discharge gauge reading of the condensate pump. Since the condensate pump is located 75° below the feedwater heater, there will be an increase in pressure due to the elevation difference. Therefore, the pressure at the inlet to the heater is higher than the discharge gauge reading of 75 psi. The only option that is higher than 75 psi is 42.525 psi, so that is the correct answer.

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72. The boiling point of water will ______ with an increased in pressure 

Explanation

When pressure is increased, the boiling point of water decreases. This is because increased pressure raises the boiling point by making it harder for water molecules to escape into the atmosphere. Conversely, when pressure is decreased, the boiling point of water increases. Therefore, the correct answer is "Be lowered".

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73. CBS company burns hydrocarbons to generate electricity for its operations. What are the two most common byproducts of hydrocarbon combustion?

Explanation

When hydrocarbons are burned, the two most common byproducts are carbon dioxide (CO2) and water (H2O). This occurs because the combustion reaction combines the carbon atoms in the hydrocarbons with oxygen from the air, forming carbon dioxide, and the hydrogen atoms combine with oxygen to form water. Carbon monoxide (CO) and sulfur (S) are not the most common byproducts of hydrocarbon combustion.

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74. Some steam heating systems operate under a vacuum in order to?

Explanation

Steam heating systems that operate under a vacuum are designed to use steam with a temperature below 212°F. This is because when steam is at a lower temperature, it requires less energy to produce and maintain, making it more efficient and cost-effective for heating purposes. Additionally, operating under a vacuum helps to prevent air from entering the steam heating system, which can cause corrosion and other issues.

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75. To raise the temperature of 1lb of water 32°F to 212°F ____BTU are needed

Explanation

To raise the temperature of 1lb of water from 32°F to 212°F, 144 BTU (British Thermal Units) are needed. BTU is a unit of energy, and in this case, it represents the amount of heat required to raise the temperature of the water. The specific heat capacity of water is 1 BTU/lb°F, meaning it takes 1 BTU of energy to raise the temperature of 1lb of water by 1°F. Therefore, to raise the temperature by 180°F (212°F - 32°F), we need 180 BTU. Hence, the correct answer is 144 BTU.

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76. The feed water stop valve is found between the _

Explanation

The feed water stop valve is found between the boiler and check valve. This valve controls the flow of feed water into the boiler, allowing it to enter only when needed and preventing backflow from the boiler to the check valve. This ensures proper regulation of water supply to the boiler and prevents any potential damage or malfunction in the system.

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77. What is 180°F on the Celsius scale?

Explanation

180°F is a temperature measurement in Fahrenheit. To convert it to Celsius, we use the formula: °C = (°F - 32) * 5/9. Plugging in the value of 180°F, we get: °C = (180 - 32) * 5/9 = 82.22°C. Therefore, 180°F is equivalent to 82.22°C on the Celsius scale.

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78. A boiler evaporates 48,000 lb of steam an hr. It evaporates 12 lb of steam sq ft og heating surface per hour. The boiler ____ sq ft of heating surface

Explanation

The given information states that the boiler evaporates 12 lb of steam per square foot of heating surface per hour. To find the total square footage of heating surface, we can divide the total amount of steam evaporated (48,000 lb/hr) by the amount of steam evaporated per square foot (12 lb/hr). This calculation gives us 4,000 square feet of heating surface. Therefore, the correct answer is 4000.

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79. A temperature reading of 80°C is equal to ______ f°

Explanation

The correct answer is 176° because to convert Celsius to Fahrenheit, you multiply the temperature in Celsius by 9/5 and then add 32. So, 80°C multiplied by 9/5 equals 144, and when you add 32 to that, you get 176°F.

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80. The amount of heat necessary to convert 100 lbs of ice at 32°f to water at 132°f is 

Explanation

To convert 100 lbs of ice at 32°F to water at 132°F, we need to consider two processes: first, we need to heat the ice from its initial temperature of 32°F to its melting point of 32°F, and then we need to heat the water from its melting point of 32°F to the final temperature of 132°F. The amount of heat required to heat the ice is given by the formula Q = m * C * ΔT, where Q is the heat energy, m is the mass, C is the specific heat capacity, and ΔT is the change in temperature. Since the ice is already at its melting point, there is no change in temperature, so the heat required to melt the ice is 0. Then, the heat required to heat the water is given by the same formula. The specific heat capacity of water is 1 BTU/lb°F, so the heat required is Q = 100 lbs * 1 BTU/lb°F * (132°F - 32°F) = 10,000 BTU. Therefore, the correct answer is 10,000 BTU.

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81. What is 140°F on the Rankin scale?

Explanation

The Rankine scale is an absolute temperature scale that uses the same increments as the Fahrenheit scale. On the Rankine scale, absolute zero is 0°R, which is equivalent to -459.67°F. To convert 140°F to Rankine, we add 459.67 to the Fahrenheit temperature, resulting in 599.67°R. Since the Rankine scale typically uses whole numbers, we round up to 600°R.

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82. The total amount of heat 1 lb of steam has as it leaves the boiler is 1200 Btu/lb. What is the equivalent in ft-lb

Explanation

The equivalent in ft-lb can be calculated by multiplying the total amount of heat (1200 Btu/lb) by the conversion factor of 778. This conversion factor represents the number of ft-lb in one Btu. Therefore, the calculation would be 1200 Btu/lb * 778 ft-lb/Btu, resulting in 933600 ft-lb.

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