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1. How soon must a reportable spill be reported?

Explanation

A reportable spill must be reported within 24 hours to ensure that proper measures can be taken promptly to contain and mitigate the spill. This ensures that potential harm to the environment, human health, and property can be minimized. Reporting the spill within this timeframe allows authorities to assess the situation and take appropriate actions to prevent further damage or contamination. Waiting longer than 24 hours may result in delays in response and potentially worsen the consequences of the spill.

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About This Quiz
CDC Quizzes & Trivia

The '3E151 B Set Vol 1' quiz assesses knowledge on fuel management, focusing on properties and handling of fuel oils, equipment setup, and system maintenance. It is crucial for professionals managing fuel systems, enhancing both safety and efficiency in fuel handling.

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2. Which of the following is a fuel that is refined from lighter hydrocarbons?

Explanation

Liquefied petroleum gases (LPG) is a fuel that is refined from lighter hydrocarbons. LPG is a mixture of propane and butane, which are both lighter hydrocarbons. It is commonly used as a fuel for heating, cooking, and vehicles. LPG is obtained during the refining process of crude oil and natural gas. It is a highly flammable and easily transportable fuel that is stored in pressurized containers.

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3. To measure the amount of fuel oil in a storage tank by hand, you must first know the

Explanation

To measure the amount of fuel oil in a storage tank by hand, knowing the capacity of the tank is crucial. The capacity of the tank refers to its maximum volume or how much it can hold when completely filled. This information is necessary to calculate the amount of fuel oil present in the tank by using appropriate conversion factors or formulas. Without knowing the tank's capacity, it would be impossible to accurately determine the amount of fuel oil in the tank.

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4. Which of the following elements must be presence before combustion can occur?

Explanation

Before combustion can occur, three elements must be present: fuel, heat, and air. Fuel provides the substance that will burn, heat provides the energy to initiate and sustain the combustion process, and air (specifically oxygen) acts as the oxidizer that allows the fuel to react and release energy in the form of heat and light. Without any one of these elements, combustion cannot take place.

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5. If you are repairing an 80ft long gas line on the ceiling in a mechanical room, you should use at least

Explanation

To properly repair an 80ft long gas line on the ceiling in a mechanical room, it is recommended to use 8 to 10 hangers. These hangers will provide sufficient support and ensure that the gas line is securely fixed in place. Using fewer hangers may result in inadequate support, while using more hangers may be unnecessary and wasteful. Therefore, the optimal range for the number of hangers to use in this scenario is 8 to 10.

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6. What item is installed on a single-stage pump when used on a two-pipe fuel line system?

Explanation

A single-stage pump is typically used on a two-pipe fuel line system to regulate the flow of fuel. The bypass port is installed on the pump to redirect excess fuel back to the fuel tank, ensuring that the pressure in the system remains constant. This prevents any damage to the pump or the fuel line system due to excessive pressure. Therefore, the bypass port is the correct answer in this case.

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7. How many times should you try to restart an oil burner if it does not ignite the first time?

Explanation

If an oil burner does not ignite the first time, it is recommended to try restarting it only once. This is because attempting to restart it multiple times can potentially cause damage to the system or create safety hazards. It is important to troubleshoot the issue and address any underlying problems before attempting to restart the burner again.

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8. What characteristic of fuel oil can cause plug burners and screens and erratic combustion such as sparkling and flashback?

Explanation

Water and sediment in fuel oil can cause plug burners and screens, as well as erratic combustion such as sparkling and flashback. When fuel oil contains water, it can lead to the formation of steam bubbles during combustion, which can disrupt the flow of fuel and air mixture. This can result in poor combustion and cause the burners and screens to become clogged. Sediment in fuel oil can also clog the burners and screens, leading to inefficient combustion and potential issues such as sparking and flashback.

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9. Oil strainers should be cleaned at regular intervals with steam, hot water, solvent, or

Explanation

Oil strainers should be cleaned at regular intervals to remove any debris or contaminants that may have accumulated. Compressed air is an effective method for cleaning oil strainers as it can dislodge and remove particles without the need for any additional solvents or cleaning agents. Using compressed air ensures that the strainers are thoroughly cleaned and ready to effectively filter oil.

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10. At ordinary atmospheric pressure, with the necessary heat of vaporization added, butane boils or changes from a liquid to a gaseous state at

Explanation

At ordinary atmospheric pressure, butane boils or changes from a liquid to a gaseous state at 32°F. This is the boiling point of butane, which means that at this temperature, the vapor pressure of butane equals the atmospheric pressure, causing it to boil and convert into a gas.

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11. The most commonly used gas pressure measuring devices are the

Explanation

Bourdon and manometer devices are the most commonly used gas pressure measuring devices. Bourdon devices are mechanical instruments that use a curved tube to measure pressure, while manometer devices use a column of liquid to measure pressure. These devices are widely used in various industries and applications to accurately measure gas pressure.

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12. How is the gas pressure regulator adjusted to decrease the gas pressure to a burner?

Explanation

To decrease the gas pressure to a burner, the gas pressure regulator is adjusted by screwing the pressure adjusting disk counterclockwise. This action reduces the tension on the regulator spring, allowing the valve to open less and restrict the flow of gas, resulting in a decrease in pressure.

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13. What are used on oil burners to give air a swirling motion to provide more intimate mixture of the air and oil and aids in flame shape?

Explanation

Turbulators are used on oil burners to give air a swirling motion, which helps in achieving a more intimate mixture of air and oil. This swirling motion aids in shaping the flame and improving combustion efficiency. Shutters, dampers, and registers are not specifically designed for this purpose and do not provide the same level of air and oil mixing as turbulators.

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14. Conductive greases and V-belts on a shaft pulleys are examples of effective

Explanation

Conductive greases and V-belts on a shaft pulleys are examples of bonding. Bonding is the process of connecting two or more conductive objects together to ensure they have the same electrical potential. In this case, the conductive greases and V-belts are used to create a continuous conductive path, allowing any static electrical potentials to be safely discharged and preventing the buildup of static electricity. This helps to prevent electrical hazards and ensures the safety of the system.

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15. Your first step in performing a pre-operational inspection on a gas fired system is to

Explanation

The first step in performing a pre-operational inspection on a gas fired system is to do a visual inspection of the area. This is important to ensure that there are no visible signs of damage, leaks, or any other potential hazards in the vicinity of the system. By visually inspecting the area, any issues can be identified and addressed before proceeding with further inspection or operation of the system. Checking for gas leaks with a soap solution may be a subsequent step in the inspection process, but it is not the first step as stated in the correct answer.

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16. What would cause a gas pressure regulator vent to leak gas?

Explanation

A hole in the diaphragm of a gas pressure regulator would cause the vent to leak gas. The diaphragm is a flexible membrane that helps regulate the flow of gas. If there is a hole in the diaphragm, it would no longer be able to effectively control the gas flow, resulting in a leak.

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17. What grades of fuel oil are used for vaporizing oil burners?

Explanation

The grades of fuel oil used for vaporizing oil burners are No 1 or No 2. This means that either No 1 or No 2 fuel oil can be used for vaporizing oil burners.

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18. What characteristic of fuel oil indicates the minimum temperature at which the oil can be pumped and is useful in the handling of heavy oils?

Explanation

The pour point of fuel oil indicates the minimum temperature at which the oil can be pumped. It is useful in the handling of heavy oils because it determines the lowest temperature at which the oil can flow freely without becoming too viscous or solidifying. The pour point is crucial in ensuring that the oil can be easily transported and utilized in various applications without any issues caused by its high viscosity or solidification at low temperatures.

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19. In low pressure systems, gas is usually distributed at pressures from

Explanation

Gas is usually distributed at pressures ranging from 3 to 8 ounces psi in low pressure systems. This range of pressure is suitable for safely distributing gas without causing any damage or leaks in the system. Higher pressures could potentially cause problems or accidents, while lower pressures may not be sufficient to effectively distribute the gas. Therefore, the range of 3 to 8 ounces psi is the appropriate pressure range for gas distribution in low pressure systems.

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20. What is dependent upon burner and combustion chamber design?

Explanation

The flame shape is dependent upon the burner and combustion chamber design. The design of the burner and combustion chamber determines how the fuel and air mix, how it is distributed, and how it ignites. These factors ultimately affect the shape of the flame produced during combustion.

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21. Port type burners are classified as

Explanation

Port type burners are classified based on the size and design of the ports. They can be categorized as small port, large port, or tile port burners. This classification is determined by the size and shape of the ports through which the fuel and air mixture is injected into the burner. Small port burners have smaller ports, while large port burners have larger ports. Tile port burners have a design where the ports are arranged in a tiled pattern. This classification helps in selecting the appropriate burner type for different applications and requirements.

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22. What type of port as burner is limited to low temperature applications due to physical structure?

Explanation

A small port burner is limited to low temperature applications due to its physical structure. The smaller size of the port restricts the amount of fuel and air that can be introduced into the burner, resulting in a lower heat output. This makes it unsuitable for high temperature applications where a larger amount of fuel and air is required to generate the desired heat.

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23. High-pressure gun-type nozzles are rated in gallons per

Explanation

High-pressure gun-type nozzles are rated in gallons per hour because they are commonly used in applications where a continuous flow of water or liquid is required over an extended period of time. By measuring the output in gallons per hour, it allows users to determine the amount of liquid that can be delivered by the nozzle within a specific time frame. This rating is important for tasks such as cleaning, irrigation, or industrial processes that require a consistent and controlled flow rate.

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24. Excess air is the air that

Explanation

Excess air is the additional amount of air that is required to completely burn the fuel. This is because complete combustion of fuel requires a specific ratio of fuel to oxygen. If there is insufficient air, the fuel will not burn completely and result in incomplete combustion. Therefore, excess air is necessary to ensure that all the fuel is burned completely and efficiently.

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25. Combustion is normally controlled

Explanation

Combustion is a process that involves the rapid oxidation of a fuel in the presence of oxygen, resulting in the release of heat and light. In order to control this process, various methods can be employed. One option is manual control, where a person manually adjusts the fuel and oxygen supply to maintain the desired combustion rate. Another option is automatic control, where control devices such as sensors and actuators are used to monitor and adjust the combustion process automatically. The correct answer states that combustion can be controlled either by manual control devices or automatic control devices, indicating that both methods are valid for controlling combustion.

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26. A gas service line should be installed at least how many inches below the ground surface?

Explanation

A gas service line should be installed at least 18 inches below the ground surface. This is to ensure that the line is protected from potential damage caused by external factors such as excavation or construction work. By burying the line at this depth, it reduces the risk of accidental damage and helps to maintain the integrity and safety of the gas service line.

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27. Which measures is being used to control static electricity, hwere the static charges which builds up within a object will be carried off harmlessly, neutralizing the difference in electrical potential?

Explanation

Grounding is the measure being used to control static electricity. Grounding involves connecting an object to the ground or a conductive material, allowing the static charges to be carried off harmlessly. This helps neutralize the difference in electrical potential and prevents the buildup of static electricity.

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28. The conversion of fuel oil to a gaseous fuel is called

Explanation

Vaporization refers to the process of converting a liquid fuel, such as fuel oil, into a gaseous state. This process involves the application of heat, which causes the fuel molecules to gain enough energy to break their intermolecular bonds and transition from a liquid to a gas. Vaporization is an essential step in the combustion process, as it allows the fuel to mix with air more efficiently, leading to a more complete and efficient combustion reaction. Atomization, on the other hand, refers to the process of breaking up a liquid fuel into small droplets, while gaseousization is not a recognized term in the context of fuel conversion.

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29. Transmission heat losses through confining walls, floors, and ceiling will occur when

Explanation

When the outside temperature is lower than the inside temperature, transmission heat losses through confining walls, floors, and ceilings occur. This is because heat naturally flows from warmer areas to cooler areas, so when the outside temperature is lower, the heat inside the building will transfer through the walls, floors, and ceilings to the colder outside environment. This results in heat loss from the building.

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30. A main problem in using a thermocouple as a flame detector in a large system is

Explanation

The main problem in using a thermocouple as a flame detector in a large system is the time it takes for the sensor to heat. This delay in heating can result in a delayed response in detecting the flame, which can be problematic in situations where immediate detection is crucial for safety or control purposes.

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31. In a flame rod rectification system, if a high-resistance leakage to ground occurs in the flame circuit, the system will

Explanation

In a flame rod rectification system, if a high-resistance leakage to ground occurs in the flame circuit, the system will shut down safety. This is because the high-resistance leakage can cause a loss of flame signal, which indicates that the flame is not present or not detected properly. To ensure safety, the system will automatically shut down to prevent any potential hazards or accidents that may occur without a proper flame signal.

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32. In what sequence is the programmer in if the programmer timer statrs its cylce, and the blower starts to purge the combustion chamber, heat exchanger, and flues?

Explanation

The correct answer is "prepurge." In the given sequence, the programmer starts with a prepurge before the blower starts purging the combustion chamber, heat exchanger, and flues. This prepurge ensures that any remaining gases or fumes are cleared out before the actual run period begins. After the prepurge, the blower starts its cycle and purges the necessary components. Therefore, the programmer is in the prepurge stage first before moving on to the other stages mentioned.

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33. Which of the following areas of preventive maintenance procedures are you following when you lubricate and tighten all linkages?

Explanation

When lubricating and tightening all linkages, you are following preventive maintenance procedures for system devices. This involves ensuring that all components of the system, such as valves, switches, and control panels, are properly lubricated and tightened to prevent any malfunctions or failures. By regularly maintaining and servicing these system devices, you can extend their lifespan and ensure the overall efficiency and reliability of the system.

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34. What valve is used in a gas valve train to shut off the gas when you are repairing or replaceing other components?

Explanation

A manual shutoff valve is used in a gas valve train to shut off the gas when repairing or replacing other components. This valve can be manually operated to stop the flow of gas, ensuring safety during maintenance or repair work. It allows the technician to isolate the gas supply, preventing any potential accidents or leaks while working on other components of the gas valve train.

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35. How are the low voltage terminals connected on a primary control, when using a line voltage controller?

Explanation

When using a line voltage controller, the low voltage terminals on a primary control are jumpered. This means that they are connected together using a short wire or metal strip. Jumpering the low voltage terminals allows for a continuous electrical connection, ensuring that the control functions properly.

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36. What component on a gas valve train does the oil pump eliminate on an oil valve train?

Explanation

The oil pump eliminates the need for a pressure regulator valve (PRV) on an oil valve train. The oil pump is responsible for supplying oil to the system, and it controls the pressure of the oil flow. Therefore, there is no need for a separate PRV to regulate the pressure in the system.

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37. An irregular stack temerature on an oil burner system would be caused by

Explanation

A fluctuating flame can cause an irregular stack temperature on an oil burner system. When the flame fluctuates, it can result in inconsistent combustion and heat output, leading to variations in the stack temperature. This fluctuation could be caused by factors such as improper fuel-air mixture, a malfunctioning burner nozzle, or a blocked fuel line. These issues can disrupt the stability of the flame, causing it to flicker or change in size, ultimately affecting the stack temperature.

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38. The electrical resistance of cadmium sulfide flame detectors (cad cell) changes with changes in

Explanation

Cadmium sulfide flame detectors, also known as cad cells, are designed to detect changes in light intensity. These detectors utilize the property of cadmium sulfide to change its electrical resistance when exposed to varying levels of light. As the light intensity increases or decreases, the resistance of the cad cell changes accordingly. Therefore, the correct answer is light intensity.

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39. What test is performed to prove that the main burner can be lit by the smallest pilot that will hold in the flame relay?

Explanation

The pilot turndown test is performed to prove that the main burner can be lit by the smallest pilot that will hold in the flame relay. This test involves gradually reducing the fuel supply to the pilot light to the minimum level while ensuring that the flame remains stable and capable of igniting the main burner. By successfully completing this test, it confirms that the smallest pilot flame is sufficient to ignite the main burner, ensuring proper functionality of the system.

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40. When there is a long underground run of the suction line, where would a check valve be installed into the line?

Explanation

A check valve would be installed where the suction line enters the building. This is because a long underground run of the suction line can cause issues such as loss of prime or airlocks. By installing a check valve at the entry point of the building, it ensures that the flow of fluid is only going in one direction, preventing any backflow or loss of prime.

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41. When checking a thermocouple with a direct current (DC) millivolt meter the positive terminal lead is clamped on the

Explanation

The capillary is the correct answer because when checking a thermocouple with a DC millivolt meter, the positive terminal lead is clamped on the capillary. The capillary is a small tube that connects the gas valve to the thermocouple. By clamping the positive terminal lead on the capillary, the millivolt meter can measure the voltage generated by the thermocouple, which is used to determine if the thermocouple is functioning properly.

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42. The firing rate of small combination burners may be

Explanation

The correct answer is "straight on-off firing". This means that the small combination burners have a firing rate that is either fully on or fully off, with no variability in between. This type of firing is often used in applications where a constant and consistent flame is required, such as in industrial processes or heating systems.

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43. What positions are the oil valves when starting up an oil burner?

Explanation

When starting up an oil burner, it is necessary to open both valves. This allows the supply valve to provide fuel to the burner, while the return valve allows any excess or unused fuel to be circulated back to the fuel tank. By opening both valves, the oil burner can receive the necessary fuel supply and operate efficiently.

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44. Oil failure would caused by a/an

Explanation

A vacuum leak in the suction line can cause oil failure. When there is a vacuum leak in the suction line, it creates a loss of suction pressure, which can prevent the oil from being properly pulled into the system. This can result in a lack of lubrication and cause the oil to fail in reaching the necessary components, leading to potential equipment damage or malfunction.

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45. Temperature at the rectifying photocell must remain under

Explanation

The temperature at the rectifying photocell must remain under 165*F to ensure its proper functioning and prevent any damage. Exceeding this temperature limit may cause the photocell to malfunction or even burn out. Therefore, it is crucial to monitor and control the temperature to maintain the optimal performance and longevity of the rectifying photocell.

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46. What type of gas burner delivers the gas into the combustion chamber from the side(s) resulting in a horizontal flame?

Explanation

An inshot burner delivers gas into the combustion chamber from the side(s), resulting in a horizontal flame. This type of burner is commonly used in appliances such as gas stoves and ovens. The gas is injected into the combustion chamber through small holes or nozzles located on the sides of the burner. The horizontal flame produced by an inshot burner provides even heat distribution and is suitable for cooking purposes.

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47. Which of the following valves controls the amount of fuel entering the burner, which determines the rate of combustion, or firing rate?

Explanation

Firing rate butterfly valves control the amount of fuel entering the burner, which directly affects the rate of combustion or firing rate. These valves are specifically designed to regulate the flow of fuel and ensure that the burner receives the required amount of fuel for efficient combustion. By adjusting the position of the butterfly valve, the flow rate of fuel can be controlled, thereby controlling the firing rate of the burner.

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48. The DC voltmeter used for testing and troubleshooting flame safeguard systems is a combination voltmeter and

Explanation

A microammeter is used for testing and troubleshooting flame safeguard systems because it is capable of measuring very small electrical currents, typically in the range of microamps. This is important for accurately detecting and monitoring the low current signals generated by the flame safeguard system. A combination voltmeter and microammeter would be a useful tool in this context as it allows for both voltage and current measurements to be taken, providing a comprehensive understanding of the electrical characteristics of the system.

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49. What type of pilot is automatically turned on each time there is a call for heat and automatically cuts off at the end of the main burner flame-establishing period?

Explanation

An interrupted pilot is a type of pilot that is automatically turned on each time there is a call for heat and automatically cuts off at the end of the main burner flame-establishing period. This means that the pilot flame is only present during the time when the main burner is igniting, and it is not continuously burning. This type of pilot is commonly used in heating systems to conserve energy and improve safety by only using fuel when necessary.

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50. For proportional air inspiration at high mixture pressures, what limits the range of worktable spud orifice diameters?

Explanation

The size of the venturi throat limits the range of worktable spud orifice diameters for proportional air inspiration at high mixture pressures. The venturi throat acts as a constriction point in the airflow, creating a pressure difference that allows for the proper mixing of primary and secondary air. If the venturi throat is too small, it will restrict the airflow and limit the range of orifice diameters that can be used effectively. Conversely, if the venturi throat is too large, it may not create enough pressure difference for proper air inspiration. Therefore, the size of the venturi throat is crucial in maintaining proportional air inspiration.

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51. Which of the following are the characteristic parts of a rotary oil burner?

Explanation

The characteristic parts of a rotary oil burner are cups and high-speed motors. Cups are responsible for holding the oil and delivering it to the burner, while high-speed motors are used to rotate the cups and create a fine mist of oil for combustion. The other options mentioned, such as nozzles and low-speed motors, are not typically associated with rotary oil burners.

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52. What type of flame detector has a sensing tube that consists of two electrodes sealed in a gas-filled quartz glass envelope?

Explanation

The correct answer is ultraviolet (UV). Ultraviolet flame detectors use a sensing tube with two electrodes sealed in a gas-filled quartz glass envelope. When a flame is present, it emits ultraviolet radiation. This radiation ionizes the gas in the sensing tube, causing a current to flow between the electrodes. This change in current is detected by the detector, indicating the presence of a flame.

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53. What is the normal operating resistance range of a cad cell used with a properly adjusted burner?

Explanation

The normal operating resistance range of a cad cell used with a properly adjusted burner is 300 to 1000 ohms. This range indicates the acceptable resistance values for the cad cell to function correctly and provide accurate readings. Resistance values below 300 ohms may indicate a faulty or dirty cad cell, while values above 1000 ohms may suggest a problem with the burner's adjustment or the cad cell itself. Therefore, the correct answer is 300 to 1000 ohms.

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54. Which draft test are you performing when the draft tube is being inserted into a removed bolt that was used in holding the fire door lining to the door?

Explanation

When the draft tube is being inserted into a removed bolt that was used in holding the fire door lining to the door, the correct draft test being performed is the "over fire draft." This means that the draft tube is being inserted above the fire, allowing the draft to flow over the fire and into the flue pipe. This test is important for ensuring proper ventilation and efficient combustion in the fire door system.

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55. What is the average heating value of natural gas per cubic feet?

Explanation

The average heating value of natural gas per cubic feet is 1000 btus. This means that for every cubic foot of natural gas burned, it releases 1000 British Thermal Units (btus) of heat energy.

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56. The spark outlet of the solid-state spark reignition system is approximately

Explanation

The spark outlet of the solid-state spark reignition system is approximately 24,000 volts. This high voltage is necessary to create a spark that can ignite the fuel-air mixture in the engine's combustion chamber. The solid-state spark reignition system uses electronic components to control the timing and intensity of the spark, resulting in improved efficiency and performance compared to traditional ignition systems. The high voltage generated by the system allows for a more reliable and powerful spark, ensuring proper combustion and smooth engine operation.

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57. How many volts should be read on the voltmeter, when checking the scanner's view of the pilot flame?

Explanation

The voltmeter should read 90 to 110 volts direct current (VDC) when checking the scanner's view of the pilot flame.

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58. When soot insulates the boiler surfaces and prevents proper absorption of heat this will result in

Explanation

When soot insulates the boiler surfaces and prevents proper absorption of heat, it will result in higher flue gas temperatures. This is because the heat that should have been absorbed by the boiler surfaces is now trapped in the flue gas, causing its temperature to rise. Additionally, the insulation effect of the soot reduces heat transfer efficiency, leading to increased heat loss to the flue.

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59. When the tube of an ultraviolet (UV) flame detector conducts (fires), the voltage potential between the electrodes

Explanation

When the tube of an ultraviolet (UV) flame detector conducts (fires), the voltage potential between the electrodes drops sharply. This is because when the UV flame detector detects a flame, it triggers a current flow through the tube. This current flow causes a drop in voltage potential between the electrodes. The sharp drop in voltage potential is a characteristic response of the UV flame detector when it detects a flame.

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60. Which of the following are considered the two sources of air for combustion in a atmospheric injection type of gas burners?

Explanation

In an atmospheric injection type of gas burner, the two sources of air for combustion are primary air and secondary air. Primary air refers to the air that is mixed with the fuel before combustion, while secondary air is the additional air that is introduced into the combustion chamber to ensure complete combustion. These two sources of air work together to provide the necessary oxygen for the combustion process.

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61. The shape of the flame can be altered from short and bushy to long and narrow in a horizontal rotary burner by

Explanation

The shape of the flame in a horizontal rotary burner can be altered by using interchangeable cups and air nozzles. By changing the cups, which control the fuel flow, and the air nozzles, which control the air flow, the size and shape of the flame can be adjusted. This allows for flexibility in achieving different flame characteristics, from short and bushy to long and narrow. The combination of interchangeable cups and air nozzles provides the necessary control over both fuel and air supply to modify the flame shape as desired.

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62. The absorption-type analyzer, consists of a container that holds a column of liquid which combines with either

Explanation

The absorption-type analyzer is used to measure the concentration of CO2 and oxygen. The analyzer consists of a container that holds a column of liquid which reacts with the gases being measured. In this case, the gases being measured are CO2 and oxygen. The liquid in the container absorbs these gases, allowing their concentration to be determined.

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63. What is known as the index of the heat which is not absorbed by the furnace and is wasted in the hot chimney gases?

Explanation

The term "percent stack loss" refers to the index of the heat that is not absorbed by the furnace and is instead wasted in the hot chimney gases. It represents the amount of heat energy that is lost through the chimney rather than being utilized efficiently by the furnace.

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64. On gas fired equipment a gas-air flow ratio should be adjusted to obtain the maximum excess air with an

Explanation

The correct answer is 8% CO2 in the flue gas. The gas-air flow ratio should be adjusted to obtain this level of CO2 in the flue gas because it indicates the optimal combustion efficiency. A higher CO2 level indicates that the combustion process is more complete, resulting in less wasted fuel and lower emissions. However, if the CO2 level is too high, it may indicate insufficient air supply, which can lead to incomplete combustion and the production of harmful pollutants. Therefore, 8% CO2 is the ideal balance to achieve maximum efficiency and minimize emissions.

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65. Air is brought in for combustion for a wick type vaporizing burner by

Explanation

The correct answer is a draft created by the rising combustion gases. In a wick type vaporizing burner, air is not brought in by a forced blower or an induced blower. Instead, the rising combustion gases create a draft that draws in the air needed for combustion. Opening the air shutters may help regulate the amount of air, but it is not the primary method of bringing in air for combustion in this type of burner.

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66. What steps can be taken to provide a stronger pilot flame on a flame rod rectification system?

Explanation

To provide a stronger pilot flame on a flame rod rectification system, increasing the gas pressure or enlarging the orifice can be effective. By increasing the gas pressure, more fuel will be supplied to the pilot flame, resulting in a stronger and more stable flame. Similarly, enlarging the orifice allows for a greater flow of gas, which also contributes to a stronger pilot flame. These steps help to ensure proper ignition and reliable operation of the flame rod rectification system.

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67. Three types of automatic gas valves are

Explanation

The correct answer is diaphragm, motorized, and solenoid. This answer is correct because it lists the three types of automatic gas valves in the correct order. The diaphragm valve is a type of valve that uses a flexible diaphragm to control the flow of gas. The motorized valve is a type of valve that is controlled by an electric motor. The solenoid valve is a type of valve that is controlled by an electromagnet. Therefore, the correct answer includes all three types of valves in the correct order.

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68. When the firing rate of an ultraviolet (UV) flame detector reaches a level indicating the presents of a flame, the amplifier switches power to the

Explanation

When the firing rate of an ultraviolet (UV) flame detector reaches a level indicating the presence of a flame, the amplifier switches power to the flame relay in the control. This means that the flame relay in the control is responsible for receiving the signal from the UV flame detector and activating the necessary actions or components in the control system to respond to the presence of a flame.

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69. When performing an ignition spark response on an ultraviolet (UV) flame detector, what is the maximum meter response when the ignition starts?

Explanation

During an ignition spark response on a UV flame detector, the maximum meter response when the ignition starts is 1/4 microamp. This means that the flame detector is designed to detect and measure a maximum current of 1/4 microamp when the ignition process begins. This response is important as it indicates that the detector is functioning properly and able to detect the initial spark of the ignition.

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70. How long can the lead of the flame rectification system be?

Explanation

The lead of the flame rectification system can be up to 150 feet long. This means that the system can effectively detect and rectify flames from a distance of up to 150 feet. A longer lead allows for more flexibility in the placement of the system, making it suitable for various applications where the flame source may be located far away from the system itself.

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71. On a call for heat, what relay closes to start the heating system in a primary control?

Explanation

The load relay closes to start the heating system in a primary control. When a call for heat is initiated, the load relay is responsible for closing the circuit and allowing the flow of electricity to activate the heating system. This relay is specifically designed to handle the load or power requirements of the heating system, ensuring that it operates efficiently and effectively.

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72. On a call for heat, the external burner controller contacts close, energizing the

Explanation

When a call for heat is made, the external burner controller contacts close, which means they come together and make a connection. This connection energizes the load relay. The load relay is responsible for controlling the flow of electrical current to the load or device that needs to be powered. Therefore, when the load relay is energized, it allows the necessary electrical current to flow and activate the heating system.

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73. How far from the bottom of the fuel tanks should the suction line end?

Explanation

The suction line should end 3 to 4 inches from the bottom of the fuel tanks. This distance is important to ensure that any sediment or impurities that may have settled at the bottom of the tanks are not drawn into the system. By keeping the suction line slightly above the bottom, the fuel being drawn into the system will be cleaner and less likely to cause damage or clog the fuel filters or injectors.

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74. When a return line rises from the burner, it is well advise to provide a check valve

Explanation

It is advisable to provide a check valve close to the pump discharge because this prevents the backflow of fuel or other substances from the burner into the pump. By placing the check valve in this location, it ensures that any flow of fuel or substances is directed away from the pump and towards the burner, enhancing the safety and efficiency of the system.

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75. What is used to sample the gas pressure and open an electrical circuit if the pressure rises past some preset level?

Explanation

A high pressure switch is used to sample the gas pressure and open an electrical circuit if the pressure rises past some preset level. This switch acts as a safety mechanism to prevent the pressure from reaching dangerous levels, ensuring the system operates within safe limits. When the pressure exceeds the predetermined threshold, the high pressure switch interrupts the electrical circuit, triggering an alarm or shutting down the system to prevent any potential damage or hazards.

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76. When checking the scanners view of the main flame, at what dial position should the main flame be established?

Explanation

The main flame should be established at dial position 2 when checking the scanners view. This indicates that the flame is at the correct intensity and functioning properly. Other dial positions may indicate a weak or strong flame, which could be a sign of a malfunction or inefficiency in the system. Therefore, dial position 2 is the ideal setting for the main flame.

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77. What type of reading would you get during prepurge and before pilot is ignited?

Explanation

During prepurge and before the pilot is ignited, there is no flow of current in the system. This is because the pilot is not yet ignited, and therefore no electrical current is being generated or flowing through the circuit. As a result, the reading for current would be zero.

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78. When the boiler flue passages are clogged with soot because of improper combustion it is a cause of

Explanation

When the boiler flue passages are clogged with soot because of improper combustion, it can lead to insufficient over fire draft. Insufficient over fire draft refers to a lack of proper air circulation in the boiler, which can result in incomplete combustion and the buildup of soot. The clogged flue passages restrict the flow of air, preventing it from effectively removing the byproducts of combustion. This can cause a decrease in draft pressure, leading to insufficient air supply and ultimately, inefficient combustion.

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79. When starting up a gas burner, what action is taken once you light and adjust the pilot?

Explanation

Once the pilot is lit and adjusted, the next action is to open the manual gas valve and adjust the operating control to call for heat. This allows the gas to flow into the burner and the operating control to signal the burner to ignite and produce heat.

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80. The requirements for a flame rod are a stable flame, adequate grounding area, proper location of the flame rod in the flame envelope, and proper

Explanation

A flame rod is a device used to detect the presence of a flame in a combustion system. In order for the flame rod to function properly, it requires a flame circuit. The flame circuit is responsible for providing the necessary electrical connection between the flame rod and the control system. This allows the control system to receive signals from the flame rod and make appropriate adjustments to maintain a stable flame. Without a flame circuit, the flame rod would not be able to effectively detect the flame and provide feedback to the control system.

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81. What limits the maximum firing rate on a gas burner?

Explanation

Flame blow-off limits the maximum firing rate on a gas burner. This occurs when the flame is extinguished due to excessive air or fuel flow, causing the flame to detach from the burner and blow off. When this happens, the burner cannot maintain a stable flame, resulting in a lower firing rate. Therefore, flame blow-off acts as a limiting factor for the maximum firing rate on a gas burner.

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82. What determines the pattern of the oil spray that is used for a given system?

Explanation

The pattern of the oil spray used in a given system is determined by the design of the combustion chamber. The combustion chamber is responsible for mixing the fuel and air, as well as igniting the mixture. The design of the combustion chamber affects the flow and distribution of the oil spray, which in turn affects the combustion process. Therefore, the design of the combustion chamber plays a crucial role in determining the pattern of the oil spray.

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83. What characteristic is used to operate the rod detection system?

Explanation

The characteristic used to operate the rod detection system is the ionization of the atmosphere. When the rod comes into contact with the atmosphere, it causes ionization, which can be detected by the system. This detection method is likely used to ensure the presence or movement of the rod is accurately monitored and controlled.

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84. In a combinantion gas valve, where does the regulator senses variation in outlet pressure?

Explanation

The regulator in a combination gas valve senses variation in outlet pressure in the evacuation gas channel. This channel is responsible for removing excess gas from the system, and the regulator monitors the pressure within this channel to ensure it remains within the desired range. By sensing the variation in outlet pressure in the evacuation gas channel, the regulator can make necessary adjustments to maintain a consistent and safe gas flow.

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85. The primary air supply on a horizontal rotary burner makes up what percentage of the total air required for combustion?

Explanation

The primary air supply on a horizontal rotary burner makes up 10 to 15 percent of the total air required for combustion. This means that a small portion of the air needed for combustion is supplied through the primary air supply, while the remaining air is supplied through other means.

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86. What type of controls are used to prove that the conditions for combustions are established?

Explanation

Burner interlock controls are used to prove that the conditions for combustion are established. These controls ensure that all necessary safety measures are in place before allowing the burner to ignite. They typically include sensors and switches that monitor parameters such as fuel flow, air flow, and flame presence. If any of these conditions are not met, the interlock controls will prevent the burner from starting, thus ensuring the safety of the combustion process.

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87. In gas burners what is known as the principal reason for inefficient combustion?

Explanation

The principal reason for inefficient combustion in gas burners is having too much excess air. When there is an excessive amount of air in the combustion process, it can lead to incomplete burning of the fuel. This results in wasted fuel and lower efficiency. By having the right balance of air and fuel, the combustion process can be optimized, ensuring efficient and effective burning of the gas.

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88. The distance from the nozzle to the end of the blast tube should never be greater that

Explanation

The distance from the nozzle to the end of the blast tube should never be greater than 1/8 inch. This is because a larger distance would result in a weaker blast and reduced effectiveness. Keeping the distance at 1/8 inch allows for a concentrated and powerful blast, ensuring optimal performance.

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89. What is known as the ratio of the ultimate carbon dioxide (CO2) percent of the gas being burned to the actual CO2 percent in the flue gas sample?

Explanation

The air-free factor is known as the ratio of the ultimate carbon dioxide (CO2) percent of the gas being burned to the actual CO2 percent in the flue gas sample. This factor helps determine the efficiency of the combustion process by comparing the expected CO2 content with the actual content in the flue gas. It accounts for the presence of other gases in the flue gas sample and provides a more accurate measure of the combustion efficiency.

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90. What interlock proves that the damper is closed or only partially open to limit the amount of air during ignition trials?

Explanation

The interlock that proves that the damper is closed or only partially open to limit the amount of air during ignition trials is "low fire." This interlock ensures that the damper is not fully open, which restricts the amount of air entering the system during ignition. This limitation is necessary to control the combustion process and prevent any potential hazards or damage that may occur if too much air is present during ignition.

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91. During a visual analysis of an oil fired unit, you detect sparklers at the edge of the flame. Which of the following best identifies the cause of causes?

Explanation

The presence of sparklers at the edge of the flame indicates a lack of proper air distribution and improper combustion. Poor air distribution can lead to incomplete mixing of fuel and air, resulting in localized areas of rich fuel mixture that can cause sparklers. Improper combustion can also contribute to sparklers, as it suggests that the fuel is not burning efficiently or completely. Therefore, the combination of poor air distribution and improper combustion is the most likely cause of the observed sparklers.

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92. A soot deposit 1/8 inch thick may increase fuel consumption by almost

Explanation

A soot deposit that is 1/8 inch thick can increase fuel consumption by almost 9 percent. Soot deposits on surfaces can disrupt the airflow and combustion process, leading to incomplete burning of fuel and decreased fuel efficiency. A deposit of this thickness can create enough obstruction to cause a noticeable increase in fuel consumption.

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93. What actions will occur when the amplified flame signal exceeds a give magnitude in a infrared detector system?

Explanation

When the amplified flame signal exceeds a given magnitude in an infrared detector system, the flame relay will energize. This means that the relay will be activated and allow the flow of current to the desired components or devices. This action is typically taken to trigger a response or initiate a specific process in the system, such as activating safety measures or signaling the presence of a flame.

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94. What component on a programmer is energizied all the time?

Explanation

The flame signal amplifier component on a programmer is energized all the time. This means that it is constantly powered and active, regardless of the programming or operational state of the device. It is responsible for amplifying the flame signal received from the flame sensor, which is then used to control the operation of the programmer and other related components.

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95. What percentage of chimney loss is made up by smoke?

Explanation

The correct answer is 2 to 3 percent. This suggests that out of the total chimney loss, smoke accounts for approximately 2 to 3 percent. This implies that the majority of chimney loss is not attributed to smoke, indicating that there are other factors contributing to the loss.

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96. One type of combustion test kit consists of a stack thermometer, combustion efficiency slide rule,

Explanation

This combustion test kit includes a CO2 indicator, smoke tester, and draft gauge. The CO2 indicator is used to measure the level of carbon dioxide in the flue gas, which is an important indicator of combustion efficiency. The smoke tester is used to measure the amount of smoke or particulate matter in the flue gas, which can indicate incomplete combustion. The draft gauge is used to measure the draft or air flow in the chimney, which can affect the combustion process. These three instruments together provide a comprehensive assessment of the combustion efficiency and emissions of a combustion system.

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97. Inadequate mixing of fuel and air during vaporization and burning is also known as insufficient

Explanation

Flame turbulence refers to the disturbance or agitation of the flame during combustion. Inadequate flame turbulence can occur when the grade of oil used is not suitable for the combustion process. This can lead to incomplete mixing of fuel and air, resulting in insufficient combustion. Therefore, the correct answer is flame turbulence for the grade of oil used.

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98. What are the two types of pilostats used for domestic gas burners?

Explanation

Valve and thermoelectric are the two types of pilostats used for domestic gas burners. The valve pilostat is responsible for controlling the flow of gas to the burner, while the thermoelectric pilostat is used to generate an electric current based on the temperature of the pilot flame. This current is then used to keep the gas valve open, ensuring that the burner remains lit.

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99. Which test or check is the best indicator of a proper detector application?

Explanation

The flame current check is the best indicator of a proper detector application because it directly measures the current flowing through the flame detector. This test ensures that the detector is properly detecting the presence of a flame. The other options, such as the pilot turndown test, safety shutdown test, and visual check of the pilot light, may provide some indication of the detector's functionality, but they do not directly measure the detector's ability to detect a flame.

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100. What valve is used to provide a convenient method of controlling the flow of fuel?

Explanation

The firing rate valve is used to control the flow of fuel in a convenient manner. It allows for adjusting the rate at which fuel is supplied to a burner or combustion system, thus regulating the intensity of the flame. This valve is commonly used in industrial processes and heating systems where precise control of fuel flow is necessary to maintain optimal performance and efficiency.

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How soon must a reportable spill be reported?
Which of the following is a fuel that is refined from lighter...
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What characteristic of fuel oil can cause plug burners and...
Oil strainers should be cleaned at regular intervals with steam, hot...
At ordinary atmospheric pressure, with the necessary heat of...
The most commonly used gas pressure measuring devices are the
How is the gas pressure regulator adjusted to decrease the gas...
What are used on oil burners to give air a swirling motion to provide...
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Your first step in performing a pre-operational inspection on a gas...
What would cause a gas pressure regulator vent to leak gas?
What grades of fuel oil are used for vaporizing oil burners?
What characteristic of fuel oil indicates the minimum...
In low pressure systems, gas is usually distributed at pressures from
What is dependent upon burner and combustion chamber design?
Port type burners are classified as
What type of port as burner is limited to low temperature applications...
High-pressure gun-type nozzles are rated in gallons per
Excess air is the air that
Combustion is normally controlled
A gas service line should be installed at least how many inches below...
Which measures is being used to control static electricity, hwere the...
The conversion of fuel oil to a gaseous fuel is called
Transmission heat losses through confining walls, floors, and ceiling...
A main problem in using a thermocouple as a flame detector in a large...
In a flame rod rectification system, if a high-resistance leakage to...
In what sequence is the programmer in if the programmer timer statrs...
Which of the following areas of preventive maintenance procedures are...
What valve is used in a gas valve train to shut off the gas when you...
How are the low voltage terminals connected on a primary control, when...
What component on a gas valve train does the oil pump eliminate on an...
An irregular stack temerature on an oil burner system would be caused...
The electrical resistance of cadmium sulfide flame detectors (cad...
What test is performed to prove that the main burner can be lit by the...
When there is a long underground run of the suction line, where would...
When checking a thermocouple with a direct current (DC) millivolt...
The firing rate of small combination burners may be
What positions are the oil valves when starting up an oil burner?
Oil failure would caused by a/an
Temperature at the rectifying photocell must remain under
What type of gas burner delivers the gas into the combustion chamber...
Which of the following valves controls the amount of fuel entering the...
The DC voltmeter used for testing and troubleshooting flame safeguard...
What type of pilot is automatically turned on each time there is...
For proportional air inspiration at high mixture pressures, what...
Which of the following are the characteristic parts of a rotary oil...
What type of flame detector has a sensing tube that consists of two...
What is the normal operating resistance range of a cad cell used with...
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What is the average heating value of natural gas per cubic feet?
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How many volts should be read on the voltmeter, when checking the...
When soot insulates the boiler surfaces and prevents proper absorption...
When the tube of an ultraviolet (UV) flame detector conducts (fires),...
Which of the following are considered the two sources of air for...
The shape of the flame can be altered from short and bushy to long and...
The absorption-type analyzer, consists of a container that holds a...
What is known as the index of the heat which is not absorbed by the...
On gas fired equipment a gas-air flow ratio should be adjusted to...
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What steps can be taken to provide a stronger pilot flame on a flame...
Three types of automatic gas valves are
When the firing rate of an ultraviolet (UV) flame detector reaches a...
When performing an ignition spark response on an ultraviolet (UV)...
How long can the lead of the flame rectification system be?
On a call for heat, what relay closes to start the heating system in a...
On a call for heat, the external burner controller contacts close,...
How far from the bottom of the fuel tanks should the suction line end?
When a return line rises from the burner, it is well advise to provide...
What is used to sample the gas pressure and open an electrical circuit...
When checking the scanners view of the main flame, at what dial...
What type of reading would you get during prepurge and before pilot is...
When the boiler flue passages are clogged with soot because of...
When starting up a gas burner, what action is taken once you light and...
The requirements for a flame rod are a stable flame, adequate...
What limits the maximum firing rate on a gas burner?
What determines the pattern of the oil spray that is used for a given...
What characteristic is used to operate the rod detection system?
In a combinantion gas valve, where does the regulator senses variation...
The primary air supply on a horizontal rotary burner makes up what...
What type of controls are used to prove that the conditions for...
In gas burners what is known as the principal reason for inefficient...
The distance from the nozzle to the end of the blast tube should never...
What is known as the ratio of the ultimate carbon dioxide (CO2)...
What interlock proves that the damper is closed or only partially open...
During a visual analysis of an oil fired unit, you detect sparklers at...
A soot deposit 1/8 inch thick may increase fuel consumption by almost
What actions will occur when the amplified flame signal exceeds a give...
What component on a programmer is energizied all the time?
What percentage of chimney loss is made up by smoke?
One type of combustion test kit consists of a stack thermometer,...
Inadequate mixing of fuel and air during vaporization and burning is...
What are the two types of pilostats used for domestic gas burners?
Which test or check is the best indicator of a proper detector...
What valve is used to provide a convenient method of controlling the...
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