Usaf CDC Quiz 2F071 Volume 1

Pressure is defined as the force exerted on a given area. Pounds per square inch (psi) is a commonly used unit to express pressure, especially in engineering and physics. It represents the amount of force in pounds applied to one square inch of area. Kilograms, pounds, and tons are units of weight, not pressure, and do not take into account the area over which the force is distributed. Therefore, the correct answer is pounds per square inch.

According to the electron theory, atoms are composed of protons, neutrons, and electrons. This theory states that protons and neutrons are located in the nucleus of an atom, while electrons orbit around the nucleus. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. This combination of particles forms the basic structure of an atom, with protons and neutrons providing the mass and electrons providing the charge. Therefore, the correct answer is protons, neutrons, and electrons.

If backflow is detected during multiple source refueling, it is necessary to stop the operation immediately. Backflow can occur when fuel flows in the opposite direction, which can lead to contamination or damage to the fuel system. Stopping the operation prevents any further backflow and potential harm to the fuel system.

Hot refueling personnel should undergo certification for hot refueling operations annually. This means that they need to renew their certification once every year. This ensures that they stay updated with the latest safety protocols and procedures related to hot refueling operations. Regular certification helps to maintain the highest level of safety standards and ensures that personnel are competent and knowledgeable in their roles.

Buoyancy is the correct answer for the lifting force of a liquid. Buoyancy refers to the upward force exerted on an object immersed in a fluid, such as a liquid. It is caused by the difference in pressure between the top and bottom of the object, with the pressure being greater at the bottom. This pressure difference results in a net upward force, which is known as buoyancy. It is this force that allows objects to float in liquids and is essential in understanding the behavior of submerged and floating objects.

The standard measure for atmospheric pressure is 14.7 psi. Atmospheric pressure is the force exerted by the weight of the air above a given point. It is commonly measured in pounds per square inch (psi). This value is considered standard because it represents the average atmospheric pressure at sea level.

The maximum number of dial retries that can be configured on the user interface terminal (UIT) when configuring the automated data collection (ADC) system is 99.

The outermost shell of valence electrons determines whether a material is a good or a poor conductor of electricity because it is the shell that is involved in bonding and interacting with other atoms. If the outermost shell is full or nearly full, the material is likely a poor conductor because the electrons are tightly held and not easily free to move and carry an electric current. On the other hand, if the outermost shell is not full, the material is likely a good conductor because the electrons are more loosely held and can easily move and carry an electric current.

Coalescing is the term used to define the process that takes place when water forms into droplets after passing through filter elements. Coalescing refers to the merging or coming together of smaller droplets into larger ones. In the context of filtration, coalescing filters are designed to remove small water droplets from a gas or liquid stream by causing them to combine and form larger droplets that can be easily separated. This process is commonly used in various industries, such as oil and gas, to remove water and other contaminants from fluids.

When the type III hydrant system product recovery tank is 70 percent full, the float assembly closes the inlet valve, which prevents more product from entering the tank. At the same time, the switch assembly automatically turns the pump on. This is because the tank is nearing its maximum capacity, and the pump needs to start transferring the product to another location for storage or processing. The switch assembly senses the level of the tank and activates the pump to ensure that the tank does not overflow.

The hot refueling supervisor is responsible for positioning the aircraft on the hot pad when personnel are servicing aircraft with the type IV hydrant system. This role is specifically assigned to the supervisor, as they oversee the hot refueling process and ensure that all safety protocols are followed. The supervisor's responsibility includes coordinating the positioning of the aircraft on the hot pad to ensure efficient and safe refueling operations.

A filter separator vessel should be cleaned every three years or when the coalescer elements are changed. This is because the coalescer elements are responsible for removing water and other contaminants from the fluid being filtered. Over time, these elements can become clogged or less effective, leading to a decrease in filtration efficiency. Therefore, it is necessary to clean the vessel and replace the coalescer elements periodically to maintain optimal performance.

The correct answer is electric current. Electric current refers to the uniform movement of electrons in a specific direction. It is the flow of electric charge through a conductor, such as a wire. This movement of electrons creates a flow of energy, which can be harnessed for various purposes. Electrical potential refers to the potential energy per unit charge at a specific point in an electric field. Free electrons are electrons that are not bound to an atom or molecule. Ionization refers to the process of creating ions by adding or removing electrons from atoms or molecules.

The correct answer is four; 50,000 gallons. The type IV hydrant system uses four tanks, each with a capacity of 50,000 gallons.

During concurrent servicing of cargo or passenger aircraft, deplaning personnel should not come closer than 25 feet from any aircraft fuel vent outlet. This distance is necessary to ensure the safety of personnel and prevent any potential accidents or incidents related to fuel vent outlets. Being too close to these outlets can pose a fire hazard, and maintaining a safe distance minimizes the risk of fuel ignition or other dangerous situations.

The Kelvin scale is commonly used for scientific measurements because it is an absolute temperature scale that starts at absolute zero, the point at which all molecular motion ceases. This makes it ideal for scientific calculations and experiments, as it allows for precise measurements and comparisons. The other options, such as the Rankine, Réaumur, and Fahrenheit scales, are not commonly used in scientific measurements due to their relative nature or limited usage in specific regions.

When two or more atoms are chemically bonded together, they form a molecule. A molecule is the smallest unit of a compound that retains all the chemical properties of that compound. Compounds are made up of molecules, so while a compound is a combination of atoms, a molecule specifically refers to the bonded atoms. An element, on the other hand, consists of only one type of atom and cannot be broken down into simpler substances. A mixture is a combination of different substances that are not chemically bonded together.

Protons and electrons have opposite charges. Protons have a positive charge, while electrons have a negative charge. This is a fundamental property of these subatomic particles in an atom.

If the tank outlet manual valve on the type III hydrant system is open during an emergency stop situation, a horn will sound. This is likely a safety measure to alert individuals that the valve is open during an emergency stop, which could potentially cause further issues or hazards.

If a receiving tank's Air Force Technical Order (AFTO) Forms 244/245 lists an open Red X condition, it means that there is a critical issue with the tank that needs to be addressed before filling it with liquid nitrogen (LIN). Filling the tank in this condition can pose a safety risk or cause further damage. Therefore, the correct action to take is to not fill the receiving tank until the issue is resolved.

Immiscible liquids are those that do not mix well together. Instead, one liquid will float on top of the other, forming distinct layers. This occurs because the intermolecular forces between the molecules of the two liquids are not strong enough to overcome the forces of attraction within each liquid. As a result, the liquids remain separate and do not form a homogeneous solution.

During a hot refueling operation, if a hose separates from the nozzle on a type IV hydrant system, a dry break coupler inside the hose closes automatically. This mechanism prevents fuel from spilling onto the hot pad.

A positive ion is formed when an atom loses one or more electrons. This results in the atom having more protons than electrons, giving it a positive charge. Therefore, the statement "An atom that lost an electron and has more protons" best describes a positive ion.

The fuel tank on the R-11 is constructed using a sheet aluminum alloy. This material is commonly used in aerospace applications due to its lightweight yet strong properties. Aluminum alloys offer a good balance between weight reduction and structural integrity, making them an ideal choice for fuel tanks where both durability and weight savings are important factors.

Ninety-weight gear oil is the correct answer because it is specifically designed for lubricating gears and other heavy-duty components. The power takeoff (PTO) on a fuel dispensing system is a mechanical device that transfers power from the engine to operate the fuel pump. Since the PTO involves gears, it requires a lubricant that can withstand high pressure and provide adequate protection. Ninety-weight gear oil, also known as 90W oil, has the viscosity and additives necessary to ensure smooth operation and prevent wear and tear on the gears.

Bourdon gauges should be calibrated annually. Calibrating them on a yearly basis ensures that they maintain their accuracy and reliability. Regular calibration helps to identify any deviations or inaccuracies in the gauge's measurements, allowing for necessary adjustments or repairs to be made. This ensures that the gauge continues to provide accurate readings and helps prevent any potential errors or safety hazards.

A pull measurement of five pounds during a semiannual inspection indicates a weak or damaged bonding receptacle. This means that the receptacle is not securely bonded, which can lead to poor electrical conductivity and potential safety hazards. A corroded bond plug would likely result in a higher pull measurement, while a corroded bonding receptacle would also show signs of degradation. However, in this case, the low pull measurement suggests that the bonding receptacle itself is weak or damaged.

A 3-horsepower motor consumes 2,238 watts of power. This can be calculated by converting horsepower to watts using the conversion factor of 746 watts per horsepower. Therefore, 3 horsepower is equal to 3 * 746 = 2,238 watts.

In combat or emergency situations that necessitate the use of hot refueling, the authority to approve deviations from hot refueling policies lies with the MAJCOM commander. This individual holds the highest level of command within a major command and has the authority to make decisions and override policies in critical situations. The FMFC, HQ USAF/A4, and Air Force Petroleum Agency may have roles and responsibilities related to fuel management, but the ultimate approval for deviations from hot refueling policies rests with the MAJCOM commander.

The throttle interlock system is a component found on R-11s and R-12s that prevents the auxiliary throttle from operating unless the power takeoff (PTO) is engaged. This system ensures that the auxiliary throttle can only be activated when the PTO is in use, providing an added layer of safety and preventing accidental throttle activation.

A filter separator differential pressure reading below 3 psi may indicate a defective O-ring or ruptured coalescers. This is because a low differential pressure suggests that there is not enough resistance in the system, which could be caused by a leak or rupture in the coalescer elements. The O-ring is a common component that can become defective and cause a decrease in pressure.

A service bulletin is a publication issued by commercial manufacturers to inform maintainers about minor defects with a product. It provides guidance on how to address these issues and ensure the product's proper functioning. Unlike a TCTO (Time Compliance Technical Order) which deals with mandatory modifications or inspections, a service bulletin focuses on non-mandatory repairs or updates. A technical manual is a comprehensive guide for operating and maintaining a product, while a manufacturer's recall is a formal action taken to address safety or performance issues that may pose a risk to users.

A limited technical inspection is performed to determine the condition of a vehicle or piece of equipment. This type of inspection focuses on specific technical aspects of the vehicle or equipment and is usually conducted to identify any potential issues or problems. It may involve checking the functionality of various components, assessing the overall condition, and ensuring compliance with safety standards. Unlike an annual inspection, which is a comprehensive examination, a limited technical inspection is more targeted and specific in nature.

MAJCOM stands for Major Command, which is a level of command in the United States Air Force. This level of command has the authority to direct the shipment of a vehicle with less than 50 percent life expectancy to satisfy mission requirements. The LRS commander, wing commander, and HQ USAF may have authority over other aspects of operations, but it is the MAJCOM that has the specific authority mentioned in the question.

The correct answer is 60. In a type III hydrant system, a mesh screen is used in the receiving strainer to prevent debris from entering the system. The size of the mesh screen is important because it determines the size of particles that can be filtered out. A smaller mesh size would allow for finer filtration, but it may also restrict the flow of water. On the other hand, a larger mesh size may allow larger particles to pass through, potentially causing blockages in the system. Therefore, a mesh screen size of 60 is likely the most appropriate choice for balancing filtration and water flow in a type III hydrant system.

When performing a hydrant flushing operation, it is important to ensure that enough fuel velocity is generated to remove water and sediment by flushing the system. This can be achieved by operating all issue pumps. By using all issue pumps, a higher flow rate can be achieved, which will help in effectively removing water and sediment from the system.

If a commercial delivery operator does not provide a Department of Defense (DD) Form 250 with a liquid oxygen (LOX) shipment, the correct action to take is to inform the FSC (Fire Support Coordinator) and await further guidance. This is necessary because the DD Form 250 is a crucial document for tracking and verifying shipments, and its absence may indicate a potential issue or error in the delivery. By informing the FSC, the appropriate authorities can be notified and necessary steps can be taken to address the situation and ensure proper handling and disposition of the shipment.

Magnetic lines of force never cross each other because they represent the direction of the magnetic field. If the lines were to cross, it would indicate that the magnetic field has two different directions at the same point, which is not possible. The lines always follow a continuous path from the north pole to the south pole of a magnet, or from a higher magnetic field strength to a lower magnetic field strength.

The correct answer is Centrifugal because it is not a type of positive displacement pump. Positive displacement pumps operate by trapping a fixed amount of fluid and then forcing it into the discharge pipe, while centrifugal pumps use centrifugal force to move the fluid. Therefore, centrifugal pumps do not fall under the category of positive displacement pumps.

During bottom loading operations, the signal to the bottom loading optic probe is used to determine the fill level of the tank. If this signal is lost, it indicates a potential issue with the loading process. In order to prevent any further problems, the electronic control module cuts power to the bottom loading electric air solenoid. This action stops the flow of air and prevents any further loading until the issue is resolved.

During a monthly inspection of emergency switches, it is important to check for proper operation while the system control panel/operation circuit is energized. This ensures that the switches are functioning correctly when they are needed in an emergency situation. Checking for proper operation while the system is energized helps to identify any potential issues or malfunctions that could affect the switches' performance. It is crucial to ensure that the switches are in good working condition to guarantee the safety and effectiveness of the emergency system.

A particulate test on a liquid oxygen (LOX) cart is required when there is suspicion of particulate contamination. This means that if there are any concerns or indications that the LOX cart may have been contaminated with particles, a test must be conducted to confirm and address the issue. This is necessary to ensure the purity and safety of the liquid oxygen being stored or transported in the cart.

An air eliminator is a filter separator component that prevents pressure surges from damaging dispensing pressure control systems. It is designed to remove air or gas bubbles from the fluid being dispensed, ensuring a smooth and consistent flow of the liquid. By eliminating air, the air eliminator helps to maintain a stable pressure and prevents any sudden surges that could potentially damage the dispensing system.

The correct answer is Every 3 hours. This is because, according to the given information, the type V hydrant system does not require manning. Therefore, regular inspections are necessary to ensure its proper functioning and to address any potential issues. Performing inspections every 3 hours allows for timely identification of any problems or malfunctions, ensuring the system's reliability and effectiveness.

The remote terminal workstation being turned on would not prevent it from receiving data. The other options all involve issues with either the remote terminal unit or the modem, which could cause a disruption in data transmission. However, as long as the remote terminal workstation is turned on, it should be able to receive data.

The ball float assembly for the high-level shutoff valve is located on the exterior of the tank at the required shut-off height. This means that the assembly is positioned outside of the tank, at the specific height where the valve needs to close to prevent overflow. Placing it on the exterior allows for easier access and maintenance of the assembly without the need to enter the tank.

In block 1 of an Air Force Technical Order (AFTO) Form 95, you should enter the mission, design, series (MDS) of the equipment. This information is important for accurately documenting the maintenance action and ensuring that it is properly recorded and tracked. It helps in identifying the specific equipment involved and provides necessary details for reference and analysis.

The behavior of liquids in both rest and motion is affected by gravity, atmospheric pressure, and applied forces. Gravity causes liquids to flow downwards and affects their density. Atmospheric pressure affects the boiling point and evaporation rate of liquids. Applied forces can cause liquids to move or change shape.

The correct answer is 3 inches. This means that the stainless steel pantographs installed inside the hardened shelters on the type V hydrant system are 3 inches in size.

When performing fuels expediter duties, using the spill response kit indicates that there has been a spill or potential environmental hazard. Therefore, it is important to notify the Fuels Environmental coordinator, as they are responsible for overseeing and managing environmental concerns related to fuel operations. They will be able to assess the situation, take appropriate action, and ensure that all necessary protocols and regulations are followed to mitigate any potential environmental damage or hazards.