1````1s051 Volume III Pretest (For Reference Use Only)

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1. (430) What type of protection is mandatory when playing racquetball?

Explanation

When playing racquetball, the only mandatory protection required is eye protection. This is because racquetball involves fast-moving balls that can cause serious eye injuries if they hit the player's face. Therefore, it is important to wear goggles or protective eyewear to prevent any potential harm to the eyes. Head and leg protection are not mandatory, although some players may choose to wear additional protective gear for added safety.

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1````1s051 Volume III Pretest (For Reference Use Only) - Quiz

USAF Safety Journeyman Volume III Pretest (FOR REFERENCE USE ONLY)

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2. (401) Resistance is any condition that

Explanation

Resistance is a property of a material or component that hinders the flow of electric current. It is a measure of how much a material or component opposes the flow of electricity. When resistance is present in a circuit, it restricts the flow of electrical current, making it more difficult for the current to pass through. This can be caused by factors such as the material's conductivity, its length, and its cross-sectional area. Therefore, the correct answer is "opposes or restricts the flow of electricity."

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3. (402) An electrical outlet must be protected by a ground fault circuit interrupter (GFCI) when it is located within how many feet of a sink?

Explanation

An electrical outlet must be protected by a ground fault circuit interrupter (GFCI) when it is located within six feet of a sink. This is because water and electricity can be a dangerous combination, and having a GFCI in close proximity to a sink helps to prevent electrical shocks and potential accidents.

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4. (402) Which safety rule should be observed where extension cords are used?

Explanation

Running extension cords through ceiling holes can cause them to become damaged or worn, leading to potential electrical hazards such as short circuits or fires. It is important to avoid running extension cords through any holes or openings in the ceiling to ensure the safety of the electrical system and prevent accidents.

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5. (404) One complete cycle of alternating current (AC) is composed of

Explanation

One complete cycle of alternating current (AC) consists of two alternations of current. In the first alternation, the current flows in one direction, and in the second alternation, the current flows in the opposite direction. This pattern repeats continuously in AC circuits, resulting in a sinusoidal waveform.

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6. (404) Which device is used to change power from one voltage to another?

Explanation

Transformers are used to change power from one voltage level to another. They work on the principle of electromagnetic induction, where a changing current in one coil induces a voltage in another coil. The ratio of the number of turns in the primary and secondary coils determines the voltage transformation. Transformers are commonly used in power transmission and distribution systems to step up or step down voltage levels for efficient transmission and utilization of electrical energy. Capacitors store electrical energy, rectifiers convert AC to DC, and filters remove unwanted noise or harmonics from a signal.

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7. (409) When there are no changes in procedures, process, or systems associated with the lockout/tagout program, retraining must take place at least every

Explanation

Retraining in lockout/tagout program is necessary when there are no changes in procedures, process, or systems associated with it. According to the given information, retraining must take place at least every year.

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8. (410) What is the hidden danger in the fumes of nitric acid?

Explanation

The correct answer is that the initial symptoms of poisoning from the fumes of nitric acid are slight but become severe later on. This means that when someone is exposed to the fumes, they may not immediately experience severe symptoms, but over time, the effects of the poisoning worsen. This highlights the hidden danger of nitric acid fumes, as individuals may not realize the severity of their exposure until it is too late.

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9. (429) Approximately how many days prior to opening day must a preseason inspection of the swimming pool be conducted?

Explanation

A preseason inspection of the swimming pool needs to be conducted approximately 30 days prior to opening day. This allows enough time to identify any necessary repairs or maintenance that may be required before the pool is open to the public. Conducting the inspection 90, 60, or 10 days prior to opening day would either be too early or too late to address any issues that may arise.

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10. (406) Grounding is effective when

Explanation

Grounding is effective when there are no breaks in the grounding path because grounding is a safety measure that provides a direct path for electrical current to flow into the ground, preventing the buildup of excess electrical charge. If there are breaks in the grounding path, the electrical current may not be able to flow properly, leading to the potential for electrical shocks, equipment damage, or even electrical fires. Therefore, a continuous and unbroken grounding path is essential for ensuring the effectiveness of grounding.

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11. (409) How often must the safety staff evaluate a lockout/tagout program to ensure the requirements of the program are being followed?

Explanation

The safety staff must evaluate a lockout/tagout program annually to ensure that the requirements of the program are being followed. This evaluation helps to identify any potential issues or non-compliance with the program and allows for necessary adjustments or improvements to be made. Quarterly or semi-annual evaluations may not provide enough time to thoroughly assess the program, while evaluating anytime a system is locked or tagged out may be too frequent and impractical. Therefore, an annual evaluation is the most appropriate timeframe for ensuring compliance and safety.

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12. (401) The flow of electricity may be compared to

Explanation

The flow of electricity can be compared to water running through a pipe because both involve the movement of a substance through a pathway. In the case of electricity, it flows through conductive materials like wires, similar to how water flows through a pipe. This analogy helps to understand concepts such as current, resistance, and voltage in electricity by relating them to the flow of water in a pipe.

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13. (402) Who is responsible for helping supervisors mark all circuit breaker boxes with the correct voltage?

Explanation

Civil engineering personnel are responsible for helping supervisors mark all circuit breaker boxes with the correct voltage. They have the knowledge and expertise in electrical systems and regulations to ensure that the circuit breaker boxes are labeled accurately. Shop personnel may not have the necessary training in electrical systems, while ground safety personnel may focus on other safety aspects. The circuit breaker box manufacturer is responsible for manufacturing the boxes, but not for marking them with the correct voltage.

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14. (403) An electrical cell consists of

Explanation

An electrical cell consists of a positive electrode, negative electrode, and an electrolyte. The positive electrode is where the oxidation reaction occurs, while the negative electrode is where the reduction reaction occurs. The electrolyte is a substance that allows the flow of ions between the electrodes, completing the circuit and allowing the cell to generate electrical energy. The other options mentioned in the question either do not include all the necessary components or include incorrect components.

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15. (403) Where can you find the standard for Air Force electrical systems and operations?

Explanation

The National Electric Code (NEC) is the standard for electrical systems and operations in the Air Force. It provides guidelines and regulations for the safe installation and use of electrical equipment. The NEC is widely recognized and adopted by various organizations, including the military. It ensures that electrical systems in the Air Force meet the necessary safety standards and comply with electrical codes. Therefore, the NEC is the correct answer for where to find the standard for Air Force electrical systems and operations.

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16. (406) Grounding is used to control

Explanation

Grounding is a safety measure used to control electrical charges by providing a path for the charges to flow safely into the ground. It helps prevent the buildup of static electricity, which can cause sparks and potentially ignite flammable materials. Additionally, grounding also helps to dissipate dynamic electrical charges, such as those created by lightning strikes or power surges, to protect equipment and prevent damage. Therefore, the correct answer is that grounding is used to control both dynamic and static electrical charges.

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17. (417) What physiological danger does liquid oxygen (LOX) present to personnel?

Explanation

Liquid oxygen (LOX) presents the physiological danger of freezing human tissue. When in contact with LOX, the extremely low temperature of the liquid can cause severe frostbite and damage to the skin and underlying tissues. This is due to the rapid transfer of heat from the body to the liquid oxygen, causing the tissues to freeze. Therefore, personnel working with LOX need to take precautions to prevent direct contact and ensure proper insulation to avoid injury.

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18. (417) Liquid oxygen (LOX) is stored at what temperature?

Explanation

Liquid oxygen (LOX) is stored at a temperature of –297ºF. Oxygen in its liquid form has a very low boiling point, which is why it needs to be kept at such a low temperature to maintain its liquid state. At this temperature, oxygen becomes a highly volatile and flammable substance, so it is important to handle it with extreme caution. Storing it at –297ºF ensures that it remains in a stable and safe state for storage and use.

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19. (423) When ladders are required in trenches, they should be placed so that workers must travel no more than how many feet in any direction to reach an exit?

Explanation

When ladders are required in trenches, they should be placed so that workers must travel no more than 25 feet in any direction to reach an exit. This is because in the event of an emergency, workers need to be able to quickly and easily access a safe exit point. Placing the ladders within a 25-foot radius ensures that workers can reach safety without having to travel a significant distance, reducing the risk of injury or delay in case of an emergency.

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20. (427) When ladders are used during aerial work, how many people may ascend or descend the structure at any one time?

Explanation

When ladders are used during aerial work, only one person is allowed to ascend or descend the structure at any one time. This is important for safety reasons to prevent overcrowding and to ensure that each person has enough space and stability while using the ladder. Having more than one person on the ladder at a time can increase the risk of accidents and falls.

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21. (429) Bleacher seating must have guardrails if it is at least how many feet from the ground?

Explanation

Bleacher seating must have guardrails if it is at least four feet from the ground. This is to ensure the safety of individuals sitting on the bleachers, preventing them from falling off and potentially getting injured. Guardrails provide a barrier that acts as a protective measure, especially in higher seating areas.

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22. (410) What ingredient present in most solvents makes them organic?

Explanation

Solvents are substances that can dissolve other substances, and most solvents are organic compounds. Organic compounds are compounds that contain carbon atoms. Carbon is a versatile element that can form strong covalent bonds with other elements, allowing it to create a wide variety of organic compounds. Therefore, the presence of carbon in solvents is what makes them organic.

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23. (419) Self-propelled construction equipment must be equipped with

Explanation

Self-propelled construction equipment must be equipped with first-aid kits, fire extinguishers, and emergency lights. This is because these items are essential for ensuring the safety of the operators and others on the construction site. First-aid kits are necessary to provide immediate medical assistance in case of injuries. Fire extinguishers are important to quickly extinguish any fires that may occur. Emergency lights are crucial for visibility and to alert others of potential hazards. Therefore, these items are necessary for the safe operation of self-propelled construction equipment.

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24. (406) It is hard to maintain an effective ground for portable electric equipment because

Explanation

Portable electric equipment is difficult to maintain an effective ground because it is constantly being moved around. This constant movement increases the risk of the equipment becoming disconnected or the grounding prong on the plug being damaged or removed. Without a proper ground, there is an increased risk of electrical shock or other electrical hazards.

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25. (411) Which kind of chemical may react vigorously at room temperature with carbon-containing substances to produce fires or explosions?

Explanation

Oxidizers are chemicals that have the ability to react vigorously with carbon-containing substances at room temperature, leading to fires or explosions. They have a strong oxidizing agent that can cause combustion by providing oxygen to the reaction. Acids, bases, and caustics do not necessarily have this oxidizing property, and therefore, are less likely to cause fires or explosions when reacting with carbon-containing substances.

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26. (432) When not in use, meat hooks should be stored in

Explanation

Meat hooks should be stored in containers or on racks when not in use to maintain cleanliness and prevent contamination. Storing them in areas away from the meat market ensures that they are kept separate from the meat and reduces the risk of cross-contamination. Individual sheaths may not provide adequate protection and can still result in contact with other surfaces. Meat coolers may not be suitable for storing hooks as they are meant for storing meat at specific temperatures. Therefore, containers or racks are the most suitable options for storing meat hooks.

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27. (425) Regular hoisting rope is made up of

Explanation

The correct answer is 6 strands with 19 wires because regular hoisting rope typically consists of multiple strands twisted together. In this case, there are 6 strands, and each strand is made up of 19 wires. This configuration provides strength and durability to the rope, making it suitable for hoisting heavy loads.

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28. (431) What type of protective equipment should be provided for workers in the pots and pans area?

Explanation

Workers in the pots and pans area should be provided with a waterproof apron and rubber gloves. This is because working with pots and pans involves handling hot liquids and food, which can cause burns or scalds. A waterproof apron will protect the worker's clothing from getting wet and stained, while rubber gloves will provide a barrier against heat and potential chemical exposure. Waterproof shoes are not necessary in this specific scenario as they do not directly contribute to the protection of the worker's hands and body.

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29. (403) What type of electrical cell can be restored to a charged condition by passing an electrical current through the cell in the opposite direction of the discharging current?

Explanation

A storage cell is a type of electrical cell that can be restored to a charged condition by passing an electrical current through the cell in the opposite direction of the discharging current. Unlike primary cells, which are disposable and cannot be recharged, storage cells are designed to be recharged and used multiple times. Therefore, a storage cell is the correct answer to the question.

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30. (414) What type of fuel storage tank can be located next to buildings?

Explanation

Vaulted (self-diking) fuel storage tanks can be located next to buildings because they are designed with a secondary containment system that prevents spills or leaks from reaching the surrounding area. The vaulted design includes a built-in dike or barrier that surrounds the tank, effectively containing any potential fuel spills or leaks. This makes it a safe option for placement near buildings, as it minimizes the risk of fire or environmental damage.

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31. (416) The handling of caustic solutions in liquid oxygen (LOX) plant operations requires the use of

Explanation

The handling of caustic solutions in liquid oxygen (LOX) plant operations can be hazardous and requires proper protective measures. Rubber gloves are necessary to protect the hands from direct contact with the caustic solution. Aprons are needed to protect the body from splashes or spills. Face shields or chemical goggles are essential to shield the face and eyes from potential splashes or fumes. This combination of protective gear ensures the safety of the workers while handling caustic solutions in LOX plant operations.

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32. (418) A fire or open flame device can be used during construction activities only when

Explanation

The correct answer is "approved by the site supervisor." This means that a fire or open flame device can only be used during construction activities if it has been given permission by the person in charge of overseeing the site. This ensures that the use of such devices is regulated and monitored to prevent any potential hazards or accidents.

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33. (421) What is the main disadvantage of using the mobile hydraulic crane?

Explanation

The main disadvantage of using a mobile hydraulic crane is that the cab is stationary. This means that the operator does not have the flexibility to move the cab along with the crane, limiting their visibility and ability to position the crane effectively. This can make it more difficult for the operator to accurately maneuver the crane and safely lift and transport heavy loads.

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34. (422) What harrow would most likely be used to smooth soil on a softball field?

Explanation

The spike-tooth harrow is most likely used to smooth soil on a softball field. This type of harrow consists of multiple rows of sharp, pointed teeth that penetrate the soil and break up clumps, creating a smoother surface. The spikes help to level the soil and remove any debris, making it ideal for maintaining a well-groomed playing field. Disk harrows are better suited for breaking up larger clumps of soil, while spring-tooth and multiple use harrows have different purposes and may not be as effective for smoothing soil on a softball field.

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35. (422) What equipment is used to break up unimproved ground?

Explanation

Plows are used to break up unimproved ground. Plows are agricultural tools that are designed to turn over the soil, breaking it up and preparing it for planting. They are commonly used in farming to loosen the soil and create furrows for planting seeds or crops. Disk harrows and multiple use harrows are also used in farming, but they are not specifically designed to break up unimproved ground like plows are. Hammer harrows, on the other hand, are not commonly used for breaking up unimproved ground.

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36. (406) What is the purpose of placing bonding wire between two metal objects?

Explanation

The purpose of placing bonding wire between two metal objects is to equalize static charges that may be generated. This helps to prevent the buildup of static electricity and ensures that the charges are evenly distributed between the objects. By equalizing the static charges, the bonding wire helps to minimize the risk of electrostatic discharge and potential damage to sensitive electronic equipment.

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37. (410) Proper handling of hydrocarbon fuels eliminates any possibility of them being spilled in the same area as

Explanation

Proper handling of hydrocarbon fuels ensures that they are not spilled in the same area as propellant oxidizers. Propellant oxidizers are substances used in rockets and missiles to provide oxygen for the combustion of the fuel. Mixing hydrocarbon fuels with propellant oxidizers can lead to a highly combustible and dangerous situation. Therefore, it is crucial to handle these substances separately to prevent any accidents or explosions.

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38. (409) On machinery, tagout devices used with energy isolating (lockout) devices should be attached at

Explanation

Tagout devices used with energy isolating (lockout) devices should be attached at the same point as the lock. This ensures that the tagout device is clearly visible and easily accessible to anyone who needs to perform maintenance or repairs on the machinery. By attaching the tagout device at the same point as the lock, it helps to prevent accidental energization of the machinery while work is being done.

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39. (410) If a worker spills hydrocarbon fuels on the skin, he or she may experience

Explanation

If a worker spills hydrocarbon fuels on the skin, it can cause cracked skin, severe burns, or blood poisoning. Hydrocarbon fuels are highly flammable and can be corrosive to the skin. They can cause the skin to crack, leading to severe burns. Additionally, if the fuels are absorbed into the bloodstream through the skin, they can cause blood poisoning, which can be life-threatening. It is important to handle hydrocarbon fuels with caution and take appropriate safety measures to prevent such accidents.

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40. (412) Which of the following is an objective of the AF Hazardous Materials Management Process (HMMP) program?

Explanation

The objective of the AF Hazardous Materials Management Process (HMMP) program is to minimize dependency on hazardous materials. This means that the program aims to reduce the reliance on hazardous materials in order to decrease the potential risks and negative impacts associated with their use. By minimizing dependency, the program can promote safer and more sustainable practices in the handling, storage, and usage of hazardous materials.

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41. (414) What type of fuel storage tanks are used to store gasoline at base service stations?

Explanation

Gasoline is typically stored in underground fuel storage tanks at base service stations. This is because underground tanks provide several advantages, including protection against fire hazards, reduced risk of fuel contamination, and preservation of space above ground. Additionally, underground tanks are less prone to temperature fluctuations, which helps maintain the quality and stability of the gasoline. Therefore, underground fuel storage tanks are the most suitable option for storing gasoline at base service stations.

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42. (414) How long must a worker wait after receiving fuel to manually gauge or measure a fuel tank?

Explanation

A worker must wait for 30 minutes after receiving fuel to manually gauge or measure a fuel tank. This waiting period ensures that any fuel vapors or fumes have dissipated, reducing the risk of fire or explosion when performing the measurement.

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43. (415) The quantity of fuel permitted in a test laboratory is limited to

Explanation

The correct answer is 10 gallons. This limit is imposed in test laboratories to ensure safety and prevent the risk of accidents or fires. By limiting the quantity of fuel to 10 gallons, the potential hazards associated with storing and handling a larger amount of fuel are minimized. This restriction helps maintain a controlled and safe environment in the laboratory.

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44. (417) A cryogenic liquid oxygen (LOX) storage tank of more than 100 gallons must be at least 75 feet from

Explanation

A cryogenic liquid oxygen (LOX) storage tank of more than 100 gallons must be at least 75 feet from aircraft parking areas. This is because LOX is highly flammable and can cause explosions if it comes into contact with certain materials, such as fuels or other flammable gases. Therefore, it is important to keep the LOX storage tank at a safe distance from areas where aircraft are parked to minimize the risk of accidents or fires.

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45. (421) When lifting loads with heavy equipment, the operator must avoid raising any load

Explanation

When lifting loads with heavy equipment, it is important for the operator to avoid raising any load that causes the tracks of the equipment to leave the ground. This is because when the tracks of the equipment leave the ground, it can lead to instability and potential accidents. Keeping the equipment grounded ensures better control and stability while lifting heavy loads, reducing the risk of accidents and ensuring the safety of the operator and those around.

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46. (418) Except in established storage areas, stacks of lumber at construction sites should not be higher than

Explanation

Stacks of lumber at construction sites should not be higher than six feet, except in established storage areas. This is because taller stacks can pose safety hazards, such as the risk of the stack toppling over or materials falling and causing injuries. By limiting the height to six feet, it helps to ensure the stability and safety of the lumber stacks, reducing the likelihood of accidents or damage.

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47. (421) Which type of crane is considered the Air Force "workhorse"?

Explanation

The mobile hydraulic crane is considered the Air Force "workhorse" because it is a versatile and powerful crane that can be easily transported and used in various locations. It is equipped with hydraulic systems that provide smooth and precise movements, making it suitable for a wide range of lifting and loading tasks. Its mobility and flexibility make it an essential tool for the Air Force in carrying out their operations efficiently.

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48. (421) Which piece of equipment is best suited to finish rolling flexible pavements and subgrades?

Explanation

The steel wheel roller is best suited for finishing rolling flexible pavements and subgrades. This type of roller has a smooth steel drum that provides uniform compaction and a smooth finish to the surface. It is able to apply the necessary pressure to compact the materials effectively without causing damage. The steel wheel roller is commonly used in road construction and maintenance projects to achieve a durable and well-compacted pavement surface.

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49. (423) The sides of excavations in loose dirt must be braced and shored if the excavations are more than

Explanation

Excavations in loose dirt must be braced and shored if they are more than four feet deep. This is because loose dirt is unstable and prone to collapse, which can lead to serious injuries or even fatalities. Bracing and shoring provide support and prevent the sides of the excavation from caving in, ensuring the safety of workers inside. Therefore, it is necessary to take these precautions when the depth exceeds four feet.

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50. (424) Toeboards placed on scaffolds must be at least

Explanation

Toeboards placed on scaffolds must be at least four inches high. This height is necessary to prevent tools, materials, or debris from falling off the scaffold and causing potential hazards to workers or people below. A two-inch height would not provide sufficient protection, while six or eight inches would be excessive and potentially make it more difficult for workers to access the scaffold. Therefore, four inches is the appropriate height for toeboards on scaffolds.

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51. (429) Playing field bleachers must always be

Explanation

The correct answer is positioned well back from the sidelines. This is because if the playing field bleachers are positioned too close to the sidelines, it can pose a safety risk for the players and spectators. By placing the bleachers well back from the sidelines, there is a reduced chance of accidents or injuries occurring during the activities on the field.

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52. (410) Color is added to aviation and motor gasolines to indicate the presence of

Explanation

Color is added to aviation and motor gasolines to indicate the presence of alkyl lead compounds. Alkyl lead compounds, specifically tetraethyl lead (TEL), were once commonly used as an anti-knock additive in gasoline. The addition of alkyl lead compounds helped to prevent engine knocking or detonation, which can cause damage to the engine. The color added to the gasoline served as a visual indicator that it contained these lead compounds. However, due to environmental and health concerns, the use of alkyl lead compounds in gasoline has been phased out in many countries.

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53. (413) What is used to track hazardous material (HAZMAT) purchases?

Explanation

The correct answer is the Standardized Air Force tracking system. This system is used to track hazardous material (HAZMAT) purchases in the Air Force. It is a centralized and standardized system that allows for efficient tracking and management of HAZMAT purchases. AF Form 3952 and AF Form 9 are not specifically designed for tracking HAZMAT purchases, and the government wide purchase card is a payment method rather than a tracking system.

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54. (431) How often should hood filters over a grill be washed?

Explanation

Hood filters over a grill should be washed after each meal period. This is because the filters collect grease, smoke, and other residues during cooking, which can accumulate and become a fire hazard if not cleaned regularly. Washing the filters after each meal period ensures that they remain clean and functional, preventing the build-up of grease and maintaining a safe and hygienic environment in the kitchen.

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55. (432) In meat market storage areas, sawdust may be used on floors

Explanation

In meat market storage areas, sawdust may be used on floors made of wood. Sawdust is commonly used in meat markets to absorb moisture and prevent the growth of bacteria. Wood floors are preferred in these areas as they are easier to clean and maintain compared to other materials like tile or concrete. Additionally, wood floors provide better insulation and help in maintaining the temperature and humidity levels required for meat storage.

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56. (410) Which base agency should be contacted if the material safety data sheet (MSDS) is not available for a particular cleaning solvent?

Explanation

If the material safety data sheet (MSDS) is not available for a particular cleaning solvent, the appropriate agency to contact would be bioenvironmental engineering. Bioenvironmental engineering is responsible for assessing and managing environmental health risks in military installations, including the handling and disposal of hazardous materials. They would have the expertise and resources to provide information and guidance on the safe use and handling of the cleaning solvent in question.

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57. (416) When liquid nitrogen is converted to gas, it expands to

Explanation

When liquid nitrogen is converted to gas, it undergoes a phase change from a liquid to a gas state. During this phase change, the nitrogen molecules gain energy and move more freely, causing the gas to expand. The expansion of the gas is determined by the change in volume. In this case, liquid nitrogen expands to 695 times its original volume when it is converted to gas.

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58. (419) Booms on construction equipment must be at least how many feet from overhead high voltage power lines?

Explanation

Construction equipment booms must be at least 10 feet away from overhead high voltage power lines. This is to ensure the safety of the workers operating the equipment and to prevent any accidents or electrocutions that could occur if the equipment comes into contact with the power lines.

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59. (431) In food preparation areas, where should electrical switches for equipment be located?

Explanation

Electrical switches for equipment in food preparation areas should be located where employees do not have to touch metal equipment to reach them. This is important to ensure safety and prevent any potential electrical hazards. Placing the switches in a location that can be easily accessed without having to touch the equipment reduces the risk of accidental contact with live electrical components, which could lead to electric shocks or other injuries.

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60. (405) How much current causes a normally harmless shock to be felt?

Explanation

A normally harmless shock is felt when the current passing through the body reaches a certain threshold. This threshold is typically around 1 milliampere. Currents lower than this are usually not felt, while currents higher than this can cause more severe shocks and potential injury. Therefore, the correct answer is 1 milliampere.

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61. (420) What is the best vehicle for clearing the sides of sloping land?

Explanation

A dozer is the best vehicle for clearing the sides of sloping land because it is equipped with a large blade that can push and move large amounts of soil and debris. The dozer's design and power allow it to effectively navigate and clear uneven terrain, making it ideal for working on sloping land. Graders, front-end loaders, and wheel-type ditchers may also be used for clearing land, but they are not as specifically designed for sloping land as a dozer.

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62. (421) A loader can be safely operated on a straight slope up to

Explanation

A loader can be safely operated on a straight slope up to 30 percent. This means that the loader can handle a slope with an incline of up to 30 percent without any risk of tipping over or losing control. Operating the loader on steeper slopes may pose a safety hazard and increase the chances of accidents or damage to the equipment. Therefore, it is important to adhere to the recommended slope limit of 30 percent to ensure safe operation of the loader.

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63. (424) A bricklayer's square scaffold must have

Explanation

The correct answer is "braces of 1 by 8 inches on both the front and rear sides." This is because braces are essential for providing stability and preventing the scaffold from collapsing. The 1 by 8 inches size ensures that the braces are strong enough to withstand the weight and forces exerted on the scaffold. Having braces on both the front and rear sides further enhances the stability of the scaffold, preventing it from tipping over in any direction.

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64. (426) Rungs on ladders must be strong enough to support at least

Explanation

The correct answer is 500 pounds because ladders need to be able to support the weight of the person using them, as well as any tools or materials they may be carrying. 500 pounds is the highest weight listed, so it ensures that the ladder can safely support the heaviest possible load.

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65. (428) When a worker doing floor removal must straddle two planks, the planks must be no more than

Explanation

When a worker is doing floor removal and needs to straddle two planks, the planks must be no more than 16 inches apart. This is because if the planks are too far apart, it could pose a safety risk for the worker, as they may lose their balance or trip while straddling the gap. Therefore, keeping the planks within a maximum distance of 16 inches ensures a safer working environment for the worker.

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66. (428) When removing materials from a demolition site, what is the maximum weight for any object being dropped through a chute?

Explanation

The maximum weight for any object being dropped through a chute at a demolition site is 150 pounds.

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67. (401) What unit of measurement is used to measure electrical current?

Explanation

Amperes is the correct answer because it is the unit of measurement used to measure electrical current. It is named after the French physicist André-Marie Ampère, who made significant contributions to the field of electromagnetism. Amperes represent the rate of flow of electric charge in a circuit, and it is a fundamental unit in the International System of Units (SI). Volts, ohms, and coulombs are also important units in electricity, but they measure voltage, resistance, and electric charge respectively, not current.

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68. (406) An example of a system ground is a

Explanation

A system ground is a connection between an electrical system and the earth. This is done to provide a safe path for electrical current to flow in the event of a fault or short circuit. A return wire attached to a ground in the earth serves as an example of a system ground as it allows excess electrical current to be safely directed away from the system and into the ground. This helps to protect both the electrical system and the individuals using it from potential electrical hazards.

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69. (408) When electrical parts are exposed, the workspace clearance must have a radius of at least

Explanation

When electrical parts are exposed, the workspace clearance must have a radius of at least three feet. This is necessary to ensure the safety of individuals working with the electrical parts. Having a three-foot radius clearance allows for enough space to prevent accidental contact with the exposed electrical parts, reducing the risk of electrical shocks or other accidents.

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70. (411) What is the maximum number of gallons of Class I flammable liquids that may be stored in a storage cabinet at one time?

Explanation

A storage cabinet can hold a maximum of 120 gallons of Class I flammable liquids at one time. This is the highest amount allowed to be stored in a cabinet according to safety regulations.

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71. (403) When electrical pressure is generated by chemical action, the device in which this occurs is called

Explanation

The correct answer is an electrical cell. An electrical cell is a device in which electrical pressure is generated by chemical action. It is commonly used to produce electric current by converting chemical energy into electrical energy.

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72. (408) Electrical resistance gloves that are in active use must be dielectric tested every

Explanation

Electrical resistance gloves are used to protect individuals from electrical hazards. These gloves need to be regularly tested for their dielectric strength to ensure they can withstand electrical currents. Dielectric testing helps identify any weaknesses or defects in the gloves that may compromise their protective properties. Testing them every 6 months strikes a balance between ensuring the gloves are in good condition and minimizing the risk of using faulty gloves.

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73. (413) What role does HAZMART play in the installation hazardous material management program (IHMP)?

Explanation

HAZMART plays a role in the installation hazardous material management program (IHMP) by issuing government-owned HAZMAT. This means that HAZMART is responsible for providing the necessary hazardous materials to the installation for their operations. By issuing government-owned HAZMAT, HAZMART ensures that the installation has access to the required materials while also maintaining control and accountability over them. This helps in the efficient management and safe handling of hazardous materials within the installation.

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74. (421) How often must cables and sheaves on cranes be inspected for defects?

Explanation

Cables and sheaves on cranes must be inspected for defects daily to ensure their safe and efficient operation. Daily inspections help identify any potential issues or wear and tear that may compromise the integrity of the cables or sheaves. Regular inspections also help prevent accidents and minimize downtime by catching any defects early on. It is crucial to prioritize daily inspections to maintain the safety and functionality of cranes in industrial settings.

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75. (403) In battery shop operations, how should sulfuric acid and water be mixed together?

Explanation

When mixing sulfuric acid and water in battery shop operations, it is important to pour the acid slowly into the water. This is because pouring water into acid can cause a violent reaction, resulting in the acid splashing or boiling over. By pouring the acid slowly into the water, the reaction is more controlled and the risk of accidents is minimized.

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76. (407) What is a relay?

Explanation

A relay is a device that communicates the information in a signal to another device. It is used to control the flow of electrical current by opening or closing circuits electromechanically or electronically. Relays are commonly used in various applications, such as in control systems, automation, telecommunications, and power distribution. They act as an interface between different devices, allowing them to communicate and coordinate their actions.

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77. (407) Which device is the simplest way to control an electrical circuit?

Explanation

A fuse is the simplest way to control an electrical circuit because it is a small device that is designed to break the circuit when there is an excessive amount of current flowing through it. When the current exceeds a certain limit, the fuse wire inside the fuse melts, causing the circuit to open and preventing any further flow of current. This protects the circuit and the connected devices from damage due to excessive current. In comparison, a relay, interlock, and circuit breaker are more complex devices that provide additional features such as remote control, safety interlocking, and automatic circuit interruption.

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78. (409) When a tag is used during the lockout/tagout procedure, it must have a minimum unlocking strength of at least

Explanation

During the lockout/tagout procedure, a tag is used to indicate that a piece of equipment is being serviced or repaired and should not be operated. The tag must have a minimum unlocking strength to ensure that it cannot be easily removed or tampered with. A minimum unlocking strength of 50 lbs. is required, meaning that the tag should require a force of at least 50 lbs. to remove it. This ensures that only authorized personnel can remove the tag and operate the equipment, preventing accidental or unauthorized use.

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79. (426) How far above a platform or landing must a portable ladder extend?

Explanation

A portable ladder must extend at least three feet above a platform or landing to ensure safe access and descent. This allows the user to maintain a secure grip and balance when stepping onto or off the ladder. Having the ladder extend three feet above the platform also provides a buffer zone to prevent accidents or falls.

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80. (407) Which circuit control device works in reverse order?

Explanation

Interlocks are circuit control devices that work in reverse order. While fuses, relays, and solenoids are typically used to control the flow of electricity or act as switches, interlocks are designed to prevent certain actions from occurring. They are used to ensure that a specific sequence of events or conditions is met before allowing a circuit to be activated. In this way, interlocks work in reverse order compared to the other options, as they prevent an action rather than enabling it.

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81. (414) Which factor is not considered when determining the size of secondary containment?

Explanation

The size of secondary containment is determined by various factors such as local weather activity, height of existing dike wall, and frequency of dike drainage. However, the location of the storage tank is not considered when determining the size of secondary containment.

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82. (418) At least how high must barriers or curbing be at the edges of excavations to protect vehicles that are loading and unloading?

Explanation

The barriers or curbing at the edges of excavations must be at least 8 inches high to protect vehicles that are loading and unloading. This height is necessary to prevent vehicles from accidentally driving off the edge of the excavation, ensuring the safety of both the vehicle operators and the workers in the excavation area.

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83. (420) Before the operator of a chain saw starts the engine, how far must the chain saw be from the fueling point?

Explanation

The chain saw must be at least 10 feet away from the fueling point before the operator starts the engine. This distance is necessary to ensure the safety of the operator and prevent any potential accidents or injuries. Fueling a chainsaw can be a hazardous task, as it involves flammable materials, so it is important to maintain a safe distance to minimize the risk of ignition or fuel spillage.

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84. (421) Which soil compacting equipment is best for compacting plastic soils?

Explanation

The sheep-foot roller is the best equipment for compacting plastic soils because of its unique design. It has a drum that is covered with numerous rectangular or conical shaped protrusions called "feet." These feet penetrate the soil and create pressure points, which helps in compacting the soil effectively. This type of roller is particularly suitable for cohesive soils like plastic soils, as it can provide deep compaction and reduce the air voids within the soil. The 13-wheel roller, steel wheel roller, and pneumatic-tire roller may not be as effective in compacting plastic soils compared to the sheep-foot roller.

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85. (424) On an outrigger scaffold, planking must be laid tight and extended

Explanation

On an outrigger scaffold, the planking must be laid tight and extended to within three inches of the building wall. This is important for ensuring stability and safety while working on the scaffold. By extending the planking close to the building wall, it provides a secure surface for workers to stand on and reduces the risk of accidents or falls. Keeping the planking within three inches of the building wall also helps to prevent any gaps or spaces where tools or materials could fall through.

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86. (401) How is electrical current measured when you want to describe its effect on the human body?

Explanation

Milliamperes is the correct answer because when measuring the effect of electrical current on the human body, it is typically done in milliamperes (mA). This unit is used because it allows for more accurate measurement of the small currents that can affect the body. Ohms, amperes, and resistance are not directly used to measure the effect of electrical current on the human body, making them incorrect options.

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87. (411) Which class of flammable liquid has a flash point below 73ºF and has a boiling point at or above 100ºF?

Explanation

Flammable liquids in Class IB have a flash point below 73°F and a boiling point at or above 100°F. This means that these liquids have a low temperature at which they can ignite and produce flammable vapors, but they do not evaporate quickly. Therefore, they have a higher boiling point compared to other flammable liquid classes.

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88. (425) A hoisting chain must be removed from service when it has elongated more than

Explanation

A hoisting chain must be removed from service when it has elongated more than ¼ inch in 12 inches. This means that if the chain stretches or lengthens by more than ¼ inch for every 12 inches of its original length, it is no longer safe to use and should be replaced. This requirement ensures that the chain maintains its strength and integrity, preventing any potential accidents or failures during lifting operations.

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89. (421) Which soil compacting equipment can usually compact a four-inch layer of loose soil to 95 percent compaction in two to four passes?

Explanation

A pneumatic-tire roller is able to compact a four-inch layer of loose soil to 95 percent compaction in two to four passes. This type of roller uses a series of rubber tires to evenly distribute the weight and pressure, allowing for effective compaction. The tires also provide a degree of flexibility, which helps to avoid over-compaction and potential damage to the soil.

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90. (406) Which of the following is not a specific characteristic of effective grounds?

Explanation

This question is asking for a characteristic that is not specific to effective grounds. The first three options all describe specific characteristics of effective grounds, such as the need for continuous paths, protection against physical damage, and keeping the natural ground circuit resistance below maximum limits. However, the statement that "equipment grounds should never exceed two ohms" is not a specific characteristic of effective grounds. It may be a general guideline or recommendation, but it is not a defining characteristic.

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91. (408) Who designates the electrical hazard areas that require the use of insulating matting?

Explanation

The supervisor designates the electrical hazard areas that require the use of insulating matting. This means that the supervisor is responsible for identifying and marking areas where there is a risk of electrical hazards, and ensuring that insulating matting is used in these designated areas to protect workers from potential electrical shocks or accidents. The supervisor plays a crucial role in ensuring the safety of the work environment and implementing necessary precautions to prevent electrical accidents.

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92. (405) The primary factor influencing the severity of electrical shock to the human body is the

Explanation

The severity of electrical shock to the human body is primarily influenced by the amount of the current flow. The higher the current flow, the more severe the shock will be. This is because the current flowing through the body can disrupt the normal functioning of the nervous system and vital organs, leading to various injuries or even death. The length of exposure, level of voltage applied, and frequency of the electrical charge can also affect the severity of the shock, but the amount of current flow is the most significant factor.

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93. (407) An interlock interrupts circuit flow

Explanation

When an electronics component tray is removed from its rack, it releases a button that interrupts the circuit flow. This means that the circuit is broken and the flow of electricity is stopped. This is likely a safety feature to prevent any accidents or damage that could occur if the tray is removed while the circuit is still active.

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94. (410) When handling fuming nitric acids, respiratory protection is required whenever the

Explanation

When handling fuming nitric acids, respiratory protection is required whenever the vapors exceed the threshold limit value. This means that if the concentration of vapors in the air is higher than the recommended limit, it is necessary to use respiratory protection to prevent inhalation of harmful substances. The threshold limit value is a guideline established by occupational health and safety organizations to protect workers from exposure to hazardous substances. In the case of fuming nitric acids, which can release toxic and corrosive vapors, exceeding the threshold limit value can pose serious health risks. Therefore, it is important to take precautions and use respiratory protection when necessary.

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95. (414) Where security fences are not provided, how far from the diked areas of underground fuel storage tanks must danger signs be posted?

Explanation

Danger signs must be posted 50 feet away from the diked areas of underground fuel storage tanks where security fences are not provided.

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96. (422) What harrow would likely be used to mix and stir soils during stabilization?

Explanation

The spring-tooth harrow would likely be used to mix and stir soils during stabilization. This type of harrow has multiple flexible teeth that can penetrate the soil and break up clumps, allowing for better mixing and distribution of materials. The spring action of the teeth helps to prevent damage to the soil structure while effectively breaking it up. Disk harrows are more commonly used for cutting and leveling, spike-tooth harrows are used for cultivating and aerating, and multiple use harrows are versatile but may not be specifically designed for soil stabilization.

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97. (429) Which base agencies perform a pre- and post-season inspection of the softball fields?

Explanation

The correct answer is Safety, civil engineering, and public health. These three base agencies are responsible for conducting pre- and post-season inspections of the softball fields. Safety ensures that the fields are safe for use, civil engineering assesses the structural integrity and maintenance of the fields, and public health ensures that the fields meet health and sanitation standards.

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98. (412) Which base agency leads the hazardous material management process (HMMP) team?

Explanation

Civil engineering leads the hazardous material management process (HMMP) team. This is because civil engineers are responsible for designing, constructing, and maintaining infrastructure, including the management of hazardous materials. They have the expertise and knowledge to handle and mitigate the risks associated with hazardous materials, ensuring the safety of the environment and the public.

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99. (415) Under dry conditions, electrode resistance to ground should not exceed

Explanation

Under dry conditions, the resistance to ground should not exceed a certain limit to ensure proper electrical grounding. This limit is determined to be 25 ohms. This means that if the electrode resistance to ground exceeds 25 ohms, it may result in inadequate grounding, which can pose safety hazards and affect the performance of electrical systems. Therefore, it is important to ensure that the electrode resistance to ground does not go beyond 25 ohms in dry conditions.

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100. (407) In electrical work, what is generally used to control large, high-voltage currents with a lowvoltage, low-current signal?

Explanation

Relays are generally used in electrical work to control large, high-voltage currents with a low-voltage, low-current signal. Relays act as switches that are controlled by an electrical signal, allowing them to handle high-power circuits without the need for the low-power control circuit to handle the high currents. This makes relays an ideal choice for controlling high-voltage currents in electrical systems.

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(430) What type of protection is mandatory when playing racquetball?
(401) Resistance is any condition that
(402) An electrical outlet must be protected by a ground fault circuit...
(402) Which safety rule should be observed where extension cords are...
(404) One complete cycle of alternating current (AC) is composed of
(404) Which device is used to change power from one voltage to...
(409) When there are no changes in procedures, process, or systems...
(410) What is the hidden danger in the fumes of nitric acid?
(429) Approximately how many days prior to opening day must a...
(406) Grounding is effective when
(409) How often must the safety staff evaluate a lockout/tagout...
(401) The flow of electricity may be compared to
(402) Who is responsible for helping supervisors mark all circuit...
(403) An electrical cell consists of
(403) Where can you find the standard for Air Force electrical systems...
(406) Grounding is used to control
(417) What physiological danger does liquid oxygen (LOX) present to...
(417) Liquid oxygen (LOX) is stored at what temperature?
(423) When ladders are required in trenches, they should be placed so...
(427) When ladders are used during aerial work, how many people may...
(429) Bleacher seating must have guardrails if it is at least how many...
(410) What ingredient present in most solvents makes them organic?
(419) Self-propelled construction equipment must be equipped with
(406) It is hard to maintain an effective ground for portable electric...
(411) Which kind of chemical may react vigorously at room temperature...
(432) When not in use, meat hooks should be stored in
(425) Regular hoisting rope is made up of
(431) What type of protective equipment should be provided for workers...
(403) What type of electrical cell can be restored to a charged...
(414) What type of fuel storage tank can be located next to buildings?
(416) The handling of caustic solutions in liquid oxygen (LOX) plant...
(418) A fire or open flame device can be used during construction...
(421) What is the main disadvantage of using the mobile hydraulic...
(422) What harrow would most likely be used to smooth soil on a...
(422) What equipment is used to break up unimproved ground?
(406) What is the purpose of placing bonding wire between two metal...
(410) Proper handling of hydrocarbon fuels eliminates any possibility...
(409) On machinery, tagout devices used with energy isolating...
(410) If a worker spills hydrocarbon fuels on the skin, he or she may...
(412) Which of the following is an objective of the AF Hazardous...
(414) What type of fuel storage tanks are used to store gasoline at...
(414) How long must a worker wait after receiving fuel to manually...
(415) The quantity of fuel permitted in a test laboratory is limited...
(417) A cryogenic liquid oxygen (LOX) storage tank of more than 100...
(421) When lifting loads with heavy equipment, the operator must avoid...
(418) Except in established storage areas, stacks of lumber at...
(421) Which type of crane is considered the Air Force "workhorse"?
(421) Which piece of equipment is best suited to finish rolling...
(423) The sides of excavations in loose dirt must be braced and shored...
(424) Toeboards placed on scaffolds must be at least
(429) Playing field bleachers must always be
(410) Color is added to aviation and motor gasolines to indicate the...
(413) What is used to track hazardous material (HAZMAT) purchases?
(431) How often should hood filters over a grill be washed?
(432) In meat market storage areas, sawdust may be used on floors
(410) Which base agency should be contacted if the material safety...
(416) When liquid nitrogen is converted to gas, it expands to
(419) Booms on construction equipment must be at least how many feet...
(431) In food preparation areas, where should electrical switches for...
(405) How much current causes a normally harmless shock to be felt?
(420) What is the best vehicle for clearing the sides of sloping land?
(421) A loader can be safely operated on a straight slope up to
(424) A bricklayer's square scaffold must have
(426) Rungs on ladders must be strong enough to support at least
(428) When a worker doing floor removal must straddle two planks, the...
(428) When removing materials from a demolition site, what is the...
(401) What unit of measurement is used to measure electrical current?
(406) An example of a system ground is a
(408) When electrical parts are exposed, the workspace clearance must...
(411) What is the maximum number of gallons of Class I flammable...
(403) When electrical pressure is generated by chemical action, the...
(408) Electrical resistance gloves that are in active use must be...
(413) What role does HAZMART play in the installation hazardous...
(421) How often must cables and sheaves on cranes be inspected for...
(403) In battery shop operations, how should sulfuric acid and water...
(407) What is a relay?
(407) Which device is the simplest way to control an electrical...
(409) When a tag is used during the lockout/tagout procedure, it must...
(426) How far above a platform or landing must a portable ladder...
(407) Which circuit control device works in reverse order?
(414) Which factor is not considered when determining the size of...
(418) At least how high must barriers or curbing be at the edges of...
(420) Before the operator of a chain saw starts the engine, how far...
(421) Which soil compacting equipment is best for compacting plastic...
(424) On an outrigger scaffold, planking must be laid tight and...
(401) How is electrical current measured when you want to describe its...
(411) Which class of flammable liquid has a flash point below...
(425) A hoisting chain must be removed from service when it has...
(421) Which soil compacting equipment can usually compact a four-inch...
(406) Which of the following is not a specific characteristic of...
(408) Who designates the electrical hazard areas that require the use...
(405) The primary factor influencing the severity of electrical shock...
(407) An interlock interrupts circuit flow
(410) When handling fuming nitric acids, respiratory protection is...
(414) Where security fences are not provided, how far from the diked...
(422) What harrow would likely be used to mix and stir soils during...
(429) Which base agencies perform a pre- and post-season inspection of...
(412) Which base agency leads the hazardous material management...
(415) Under dry conditions, electrode resistance to ground should not...
(407) In electrical work, what is generally used to control large,...
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