High Pressure Boiler Quiz Questions And Answers

The correct answer is "all persons in the workplace" because health and safety are a collective responsibility that should be shared by everyone in the workplace, including management, employees, and owners. It is not solely the responsibility of one group or individual. All individuals should actively contribute to creating a safe and healthy work environment by following safety protocols, reporting hazards, and taking necessary precautions to prevent accidents or injuries.

The correct answer is "all of the above" because insufficient steam supply to the heating units can be caused by improper pitch, which refers to the incorrect slope of the pipes that prevents proper steam flow. It can also be caused by defective radiator valves that fail to regulate the steam flow effectively. Additionally, clogging of connections and valves can restrict the steam flow, leading to insufficient supply. Therefore, all of these factors can contribute to insufficient steam supply to the heating units.

A packaged boiler is a type of boiler that is built and ready for installation. It is a self-contained unit that includes all the necessary components such as the boiler, burner, controls, and accessories. The packaged boiler is designed to be easily transported and installed at the desired location. This type of boiler is commonly used in industrial and commercial settings where quick and efficient installation is required.

The supervisor should assist the worker in seeking and obtaining support services during worker rehabilitation. This is important because support services can help the injured worker in their recovery process and provide necessary assistance and resources. By guiding the worker towards these services, the supervisor can contribute to their overall rehabilitation and ensure they receive the necessary support during this time.

Having an effective health and safety program in place is the first step an employer should take to reduce the negative effects of workplace injuries. This program ensures that proper safety protocols and measures are implemented to prevent accidents and injuries. It includes regular safety training for employees, hazard assessments, and the implementation of safety policies and procedures. By having a comprehensive health and safety program, employers can proactively address potential risks and create a safer work environment for their employees.

Power boilers usually require 2 blowdown valves.

The main disadvantage of an electric boiler is that the input energy cost is high. This means that it can be expensive to operate and maintain an electric boiler compared to other types of boilers. The high cost of energy input can make it less economical and less attractive for some users, especially for those who are looking for more cost-effective heating options.

The wetback scotch back boiler was primarily designed for marine service. This means that it was specifically intended to be used in ships and other vessels for heating purposes. Marine service boilers are designed to withstand the unique challenges and conditions of being on a ship, such as the constant movement, limited space, and the need for efficient heating. Therefore, the wetback scotch back boiler would be suitable for providing heating in marine environments.

High-pressure boilers operate at pressures above 14.69 PSI. This means that the pressure inside the boiler is higher than 14.69 pounds per square inch. The other options listed, 145.03 PSI, 72.51 PSI, and 362.5 PSI, are all higher pressures and therefore not correct. The correct answer indicates the specific pressure threshold that qualifies a boiler as high-pressure.

The steam space of a boiler must be large enough to separate the water from the steam. This is important because as water is heated and converted into steam, any remaining water droplets must be separated from the steam to ensure that only dry steam is delivered to the intended destination. If water is not properly separated, it can cause damage to equipment or reduce the efficiency of the system. Therefore, a sufficient steam space is necessary to allow for effective separation of water from steam.

If the water level falls too low during the operation of a steam heating boiler, it is crucial to shut the boiler down. This is because a low water level can lead to overheating and potentially cause damage to the boiler. By shutting it down, the operator can prevent any further issues and ensure the safety of the boiler.

Increasing the number of tube passes in a fire tube boiler enhances the heat transfer capability. This is because each pass allows the flue gases to pass over the tubes multiple times, increasing the contact time and improving heat transfer efficiency. With more tube passes, there is a larger surface area available for heat exchange, resulting in better heat transfer from the flue gases to the water. Therefore, increasing the number of tube passes is a viable method to augment the heat transfer capability in a fire tube boiler.

Hot water supply boilers are not considered to be heating boilers unless the operating temperature exceeds 200°F. This means that hot water supply boilers are typically used for providing hot water for domestic use, such as showers and faucets, rather than for heating purposes. If the operating temperature exceeds 200°F, it indicates that the boiler is being used to provide heat for a building or space.

The correct answer is "tertiary". In a furnace, combustion air is fed at three elevations: primary, secondary, and tertiary. The primary air is supplied at the bottom of the furnace to support the initial combustion process. The secondary air is introduced above the primary air to ensure complete combustion. Lastly, the tertiary air is fed at the top of the furnace to help with the burnout of any remaining combustible gases and particles.

A compact design of a steam boiler would help reduce building costs because it would require less space for installation. By reducing the overall size of the boiler, less material and labor would be needed for construction, resulting in lower building costs. Additionally, a smaller boiler would require less space for ventilation and maintenance, further contributing to cost savings.

Shatter-resistant glass or plastic applies to safety glasses because safety glasses are designed to protect the eyes from potential hazards and injuries. Shatter-resistant materials ensure that the glasses do not break easily upon impact, reducing the risk of glass or plastic shards causing further harm to the wearer. This feature is particularly important in environments where there is a high risk of objects flying or falling, such as construction sites or manufacturing plants.

Steam is used in this context because it allows the minimum quantity of injected fluid to carry the maximum amount of heat. By using steam, which has a high heat capacity, a smaller amount of fluid can be injected while still transferring a significant amount of heat. This is beneficial in terms of efficiency and cost-effectiveness, as it minimizes the amount of fluid required while maximizing the heat transfer.

An air vent is not a source of heat because its primary function is to allow air to flow in and out of a space for ventilation purposes. Unlike a convector, unit ventilator, or radiator, an air vent does not produce or distribute heat. Instead, it allows for the circulation of air to maintain proper air quality and temperature control in a room or building.

Convectors use metal fins to increase heat transfer. Metal fins are attached to the surface of the convector, which increases the surface area available for heat exchange. This allows for more efficient transfer of heat from the convector to the surrounding air. The metal fins help to distribute the heat evenly and quickly, improving the overall effectiveness of the convector in heating a space.

In a gravity return system, the boiler should be placed well below the lowest radiator. This is because in a gravity return system, the heated water naturally rises to the radiators and then cools down and falls back to the boiler through gravity. By placing the boiler below the lowest radiator, it ensures that the cooled water can easily flow back to the boiler without any obstructions or resistance. Placing the boiler above the radiators would create a challenge for the cooled water to flow back, as it would need to overcome gravity.

The correct answer is "can be of various straight or bent configurations." This means that high-pressure water tubes can have different shapes, either straight or bent. This flexibility allows for customization and adaptation to different system requirements.

The vibration in this context helps with leveling out the bed of burning biomass. By shaking or vibrating the biomass, it helps to distribute it evenly and ensure that it is level. This is important for efficient combustion, as an uneven bed can lead to uneven burning and reduced combustion efficiency.

The bent tube boiler design allows the tubes to be attached radially on the outside of the drum. This design offers several advantages. Firstly, it allows for a larger heating surface area, which increases the boiler's efficiency. Additionally, the bent tubes help to enhance heat transfer by creating turbulence within the flue gases. This design also allows for better circulation of water within the boiler, promoting more effective heat transfer. Overall, attaching the tubes radially on the outside of the drum in a bent tube boiler design optimizes the boiler's performance.

A unit heater is a device that consists of a heating coil and a fan within the same unit. When air is forced through the heating coil, it gets heated and then distributed into the surrounding space by the fan. This type of unit is commonly used for heating large areas such as warehouses, garages, or industrial buildings. It is an efficient and effective way to provide heat in a controlled manner.

In a two-pipe vacuum return system, steam is supplied at a maximum pressure of 15 psi. This pressure is necessary to ensure proper functioning and efficiency of the system. It allows for the steam to flow through the pipes and reach the desired locations, such as radiators or other heating elements, effectively. A lower pressure may not provide enough force to push the steam through the system, while a higher pressure could cause damage or leaks in the pipes. Therefore, 15 psi is the appropriate maximum pressure for this type of system.

A major disadvantage of a firebox boiler is that cleaning and inspection can be difficult. This means that maintaining and ensuring the proper functioning of the boiler can be a challenging task. The design of the firebox boiler may make it harder to access and clean certain areas, leading to potential issues with efficiency and performance. Regular cleaning and inspection are crucial to prevent build-up of debris and ensure safe operation, so the difficulty in performing these tasks can be a significant drawback of this type of boiler.

A radiator trap is a device used to allow only water to leave the radiator. This means that it prevents any air, steam, or other substances from escaping the radiator, ensuring that only water is released. This is important because water is the desired substance to be removed from the radiator in order to regulate its temperature and prevent overheating. By allowing only water to leave, the radiator trap helps maintain the efficiency and functionality of the radiator.

The worker's attitude before and after the accident can greatly influence their post-accident recovery. A positive attitude can contribute to a faster and more successful recovery, as it can lead to increased motivation, resilience, and willingness to participate in rehabilitation efforts. Conversely, a negative attitude may hinder recovery by causing the worker to become discouraged, unmotivated, or resistant to treatment. Therefore, the worker's attitude plays a crucial role in determining the outcome of their recovery process.

Employees in the age group of 16 to 25 years have the highest proportion of injuries reported. This could be because younger employees may have less experience and may be more prone to accidents or injuries due to their lack of familiarity with workplace hazards and safety protocols. Additionally, this age group may also engage in more physically demanding tasks or be more prone to taking risks, which could contribute to a higher rate of injuries.

The correct answer is water because water is used as a cooling medium in boilers to absorb heat from the fire or flue gases. It helps in preventing overheating of the boiler components and maintains their temperature within safe limits. Water also helps in transferring heat from the boiler to the steam, which is then used for various purposes. Therefore, all parts of the boiler exposed to fire or flue gases must be covered by water to ensure efficient and safe operation.

A low water cutoff is not required on an electrode-type electric boiler because this type of boiler does not rely on water levels to regulate its operation. Instead, it uses electrodes to heat the water directly, eliminating the need for a low water cutoff device that would shut off the boiler if the water level drops too low.

The correct answer is principle contractor. In incidents where contractors are present, the principle contractor is the one who has the highest level of control and responsibility. They oversee and coordinate the work of other contractors on site, ensuring that safety measures are followed and the project is completed efficiently. This role involves managing the overall construction process and ensuring compliance with regulations and standards.

The exhauster on an air separation tank consists of a series of nozzles through which water is forced by a pump. Nozzles are typically used in exhausters to create a high-velocity jet of water, which helps to create suction and effectively remove air or gases from the tank. The forceful flow of water through the nozzles creates a vacuum effect, allowing for efficient separation of air from the tank.

Sensible heat refers to the heat that causes a change in the temperature of a substance without changing its state. This means that the substance remains in the same physical state (solid, liquid, or gas) but its temperature increases or decreases. In contrast, latent heat causes a change in the state of a substance, such as melting or boiling. Therefore, the term "sensible" accurately describes heat that affects the temperature of a substance without changing its state.

In a positive pressure furnace, there is a risk of flue gas leakage. To prevent this, a steel casing is used to form a seal for the furnace. This casing ensures that the flue gases are contained within the furnace and do not leak out. It helps maintain the pressure inside the furnace and prevents any potential hazards or inefficiencies that could arise from flue gas leakage.

Superheated steam is used to avoid condensation loss because it has a higher temperature than saturated steam. When steam is superheated, it does not contain any moisture and is in a gaseous state. This prevents any condensation from occurring, which can lead to loss of heat energy and reduced efficiency in steam systems. Therefore, using superheated steam helps to maintain the desired temperature and prevent any loss of heat during the transfer process.

The operating voltage for an electrode-type boiler can be as high as 16,000 volts.

The first law of thermodynamics states that heat and work are mutually convertible. This means that energy can be transferred between a system and its surroundings in the form of either heat or work. The law implies that the total energy of a closed system remains constant, and any change in energy is due to the transfer of heat or work. Heat can be converted into work, and vice versa, as long as the total energy remains conserved.

The control of the immersion heater boiler is done by turning on and off the number of heating elements. By controlling the number of heating elements that are active, the boiler can regulate the amount of heat being generated. This allows for precise control over the temperature of the water in the boiler. By turning on more heating elements, the water can be heated more quickly, while turning off some elements can reduce the heating rate. This control mechanism ensures that the boiler operates efficiently and maintains the desired water temperature.

The given answer states that "lower initial costs" is not an advantage for low-pressure water tube and tubular type boilers. This implies that these types of boilers do not have the benefit of lower initial costs compared to other types of boilers.

A Hartford loop is a pressure balancing device that is used to prevent the boiler pressure from forcing the water in the boiler into the return line. It is a piping arrangement that creates a loop in the piping system, which allows for the accumulation and release of steam and condensate. This loop helps to prevent water hammer and ensures that the pressure in the boiler remains balanced, preventing any damage to the system. Therefore, the correct answer is the Hartford loop.

A vacuum pump maintains a vacuum pressure that is 1.01 to 1.45 psi higher in the condensate return system.

Excessive vibration in a D-type water tube packaged boiler can be a problem. This can lead to various issues such as damage to the boiler components, increased wear and tear, and potential safety hazards. Excessive vibration can be caused by factors such as improper installation, unbalanced loads, or mechanical issues within the boiler. It is important to address this problem to ensure the smooth and efficient operation of the boiler.

The correct answer is 2700 hp. An immersion electric boiler is a type of boiler that uses electric heating elements to heat water or generate steam. The capacity of an immersion electric boiler refers to the maximum power output it can provide, which is measured in horsepower (hp). A higher horsepower indicates a greater capacity to generate heat or steam. Therefore, the immersion electric boiler with a capacity of 2700 hp can provide the highest power output among the options given.

Specific heat is the correct answer because it refers to the amount of heat energy required to raise the temperature of a unit mass of a substance by one degree Fahrenheit without changing its state. It is a characteristic property of a substance and helps in determining how much heat energy is needed to change the temperature of a given amount of the substance. Sensible heat refers to the heat energy that causes a change in temperature, while superheat and saturated are terms used in thermodynamics to describe the state of a substance.

If the black liquor, which is a byproduct of the paper-making process, is too weak, it means that it has a low concentration of chemicals and solids. This can lead to a buildup of gases, such as methane, which are highly flammable. If ignited, these gases can cause an explosion. Therefore, a weak black liquor is potentially dangerous in terms of explosion risk.

The second law of thermodynamics states that in order to transfer heat from a cold substance to a hotter substance, external work must be supplied. This means that energy needs to be expended in the form of work to overcome the natural flow of heat from a hotter region to a colder region. This work can be done by a compressor or a pump in a refrigeration system, for example, to create the necessary pressure difference and move the heat against its natural direction.

A bimetal thermometer consists of two dissimilar wires connected together. This design allows for the measurement of temperature by utilizing the different expansion rates of the two metals. When the temperature changes, the two metals expand or contract at different rates, causing the bimetal strip to bend. This bending motion is then converted into a temperature reading on the thermometer scale. Therefore, the correct answer is two dissimilar wires connected together.

The level of water in the basket affects the amount of steam produced by an electrode-type boiler. This is because the heating elements in the boiler are submerged in water, and the level of water determines the amount of surface area in contact with the elements. More water in the basket means more surface area for heat transfer, resulting in a higher production of steam.