3e151 B Set Vol 1

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1/100 Questions

How soon must a reportable spill be reported?
- Within 12 hours
- Within 24 hours
- Within 36 hours
- Within 48 hours

About This Quiz

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?
- Lubrication oil
- Liguefied petroleum gases (LPG)
- Petroleum coke
- Asphalt
Correct Answer

A. Liguefied petroleum gases (LPG)

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
- Diameter of the tank
- Length of the tank
- Height of the tank
- Capacity of the tank
Correct Answer

A. Capacity of the tank

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?
- Heat, air, and light
- Fuel, heat, and air
- Ignition, light, and air
- Flash tempetature, fuel, and atmospheric air
Correct Answer

A. Fuel, heat, and air

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
- 5 to 7 hangers
- 8 to 10 hangers
- 12 to 15 hangers
- 16 to 18 hangers
Correct Answer

A. 8 to 10 hangers

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?
- Bleed slot
- Bypass port
- Needle valve
- Prime port
Correct Answer

A. Bypass port

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?
- Once
- Twice
- Three
- Four
Correct Answer

A. Once

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?
- Low viscosity
- High viscosity
- Sulfur content
- Water and sediment
Correct Answer

A. Water and sediment

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
- Gasoline
- Compressed air
- Gasoline and hot water
- Water and soap solution
Correct Answer

A. Compressed air

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
- -42*F
- -32*F
- 0*F
- 32*F
Correct Answer

A. 32*F

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
- Fluid and diaphragm devices
- Solenoid and manometer devices
- Bourdon and manometer devices
- Manometer and fluid devices
Correct Answer

A. Bourdon and manometer devices

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?
- Push the pressure adjusting disc in
- Push the pressure adjusting disc out
- Screw the pressure adjusting disk clockwise
- Screw the pressure adjusting disk counterclockwise
Correct Answer

A. Screw the pressure adjusting disk counterclockwise

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?
- Shutters
- Dampers
- Registers
- Turbulators
Correct Answer

A. Turbulators

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
- Bonding
- Grounding
- Testing for static electrical potentials
- Eliminating all electrical hazards
Correct Answer

A. Bonding

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
- Check for gas leaks with a soap solution
- Turn off all power to the system
- Look inside the combustion chamber
- Do a visual inspection of the area
Correct Answer

A. Do a visual inspection of the area

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?
- Obstruction on the valve seat
- Hole in the diaphragm
- Spring tention set to high
- Spring tention set to low
Correct Answer

A. Hole in the diaphragm

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?
- No 1 or No 2
- No 2 or No 4
- No 4 or No 5
- No 5 or No 6
Correct Answer

A. No 1 or No 2

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?
- Flash point
- Pour point
- Viscosity
- Specific gravity
Correct Answer

A. Pour point

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
- 0 to 5 ounces psi
- 3 to 8 ounces psi
- 1 1/2 psi to 25 psi
- 25 to 50 psi
Correct Answer

A. 3 to 8 ounces psi

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?
- Amount of main air
- Amount of firing air
- Flame shape
- Turndown adjustment
Correct Answer

A. Flame shape

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
- Small port, large port, or tile port burners
- Premixing port, small port, or large port burners
- Single prot, double port, or tile port burners
- Premixing port, single port, or double port burners
Correct Answer

A. Small port, large port, or tile port burners

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?
- Single port
- Small port
- Large port
- Tile port
Correct Answer

A. Small port

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
- Second
- Minute
- Hour
- Day
Correct Answer

A. Hour

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
- Is not required
- Lacks suffucuent oxygen content
- Is required to competely burn the fuel
- Is released through the combustion process
Correct Answer

A. Is required to competely burn the fuel

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
- Manually
- Pneumatically
- By automatically control devices
- Either by manual or automatic control devices
Correct Answer

A. Either by manual or automatic control devices

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?
- 10 inches
- 14 inches
- 18 inches
- 24 inches
Correct Answer

A. 18 inches

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?
- Bonding
- Grounding
- Humidification
- Vaporization
Correct Answer

A. Grounding

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
- Atomization
- Vaporization
- Gaseousization
- Combustion
Correct Answer

A. Vaporization

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
- Outside air leaks into the buildings
- The inside temperature is lower than the outside temperature
- The outside temperature is lower that the inside temperature
- Heat is required to warm outside air used for ventilation
Correct Answer

A. The outside temperature is lower that the inside temperature

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
- The method required for the sensor to heat
- The time it takes for the sensor to heat
- That the sensor can not be used in a direct flame
- The rating of the sensors are too small
Correct Answer

A. The time it takes for the sensor to heat

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
- Go into high fire
- Go into low fire
- Shutdown safety
- Shutdown and start over
Correct Answer

A. Shutdown safety

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?
- Postpurge
- Prepurge
- Run period
- Ignition trials
Correct Answer

A. Prepurge

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?
- Wiring
- Flame detector
- System devices
- Final checkout
Correct Answer

A. System devices

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?
- Safety shutoff
- Pressure regulator
- Fire control
- Manual shutoff
Correct Answer

A. Manual shutoff

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?
- They are jumpered
- They are disconnected
- They are wired in series with the line voltage controller
- They are wired in parallel with the line voltage controller
Correct Answer

A. They are jumpered

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?
- Safety shutoff valve (SSOV)
- Pressure regulator valve (PRV)
- High pressure control
- Low pressure control
Correct Answer

A. Pressure regulator valve (PRV)

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
- A sooted stack control helix
- Electrodes being cracked or grounded
- A leaky pump seal
- A fluctuating flame
Correct Answer

A. A fluctuating flame

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
- The voltage source
- The current flow
- Light intensity
- Heat intensity
Correct Answer

A. Light intensity

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?
- Pilot turnup test
- Pilot turnoff test
- Pilot turndown test
- Pilot lightoff test
Correct Answer

A. Pilot turndown test

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?
- Next to the burner
- Next to the pump
- Where it enter the building
- Where it leaves the tank
Correct Answer

A. Where it enter the building

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
- Very end of the thermocouple
- Side of the gas valve
- Pilot bracket
- Capillary
Correct Answer

A. Capillary

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
- Low and high firing
- Variable firing
- Straight on-off firing
- Timed delay firing
Correct Answer

A. Straight on-off firing

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?
- Open the supply valve and close the return valve
- Close the supply valve and open the return valve
- Open both valves
- Close both valves
Correct Answer

A. Open both valves

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
- Vacuum leak in the return line
- Vacuum leak in the suction line
- Improper nozzle adjustment
- Improper burner adjustment
Correct Answer

A. Vacuum leak in the suction line

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
- 125*F
- 145*F
- 155*F
- 165*F
Correct Answer

A. 165*F

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?
- Inshot burner
- Upshot burner
- Downshot burner
- Overshot burner
Correct Answer

A. Inshot burner

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?
- Firing rate butterfly valves
- Firing rate gate valves
- Quick opening butterfly valve
- Quick opening gate valve
Correct Answer

A. Firing rate butterfly valves

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
- Microvoltmeter
- Millivoltmeter
- Microammeter
- Milliammeter
Correct Answer

A. Microammeter

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?
- Continuous pilot
- Standing pilot
- Interrupted pilot
- Intermittent pilot
Correct Answer

A. Interrupted pilot

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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3e151 B Set Vol 1

How soon must a reportable spill be reported?

Quiz Preview

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

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

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

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

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

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

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

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

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

The most commonly used gas pressure measuring devices are the

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

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?

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

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

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 temperature at which the oil can be pumped and is useful in the handling of heavy oils?

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 due to physical structure?

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 the ground surface?

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?

The conversion of fuel oil to a gaseous fuel is called

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

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

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

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?

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

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

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

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

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

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

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

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

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

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 from the side(s) resulting in a horizontal flame?

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

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

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?