3e451 Volume 1 Fuel And Electrical Fundamentals

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  • 1/100 Questions

    (005) What should you do first if you get soaked with fuel?

    • Find the nearest emergency shower, remove your clothes, and the drench yourself
    • Find the nearest emergency shower and drench yourself with your clothes on
    • Return to the shop and take a shower
    • Go home and take a shower
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Air Force Quizzes & Trivia
About This Quiz

This quiz on '3E451 Volume 1 Fuel and Electrical Fundamentals' assesses knowledge on fuel properties, safety measures, and handling protocols within the Air Force. It covers critical points like boiling, flash points, and safe practices, essential for operational safety and efficiency.

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  • 2. 

    (014) What is performed after a contractor has completed work?

    • Acceptance inspection

    • Facility board approval

    • Change orders

    • Design review

    Correct Answer
    A. Acceptance inspection
    Explanation
    After a contractor has completed work, an acceptance inspection is performed. This inspection is conducted to ensure that the work meets the required standards and specifications. It involves a thorough examination of the completed work to check for any defects, errors, or deviations from the agreed-upon plans. The purpose of the acceptance inspection is to determine whether the contractor has fulfilled their obligations and if the work is acceptable for final approval and payment.

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  • 3. 

    (016) Which one of the following is not considered a hazardous substance?

    • Oily rags

    • Used fuel filters

    • Lead paint chips

    • Stagnant ditch water

    Correct Answer
    A. Stagnant ditch water
    Explanation
    Stagnant ditch water is not considered a hazardous substance because it does not contain any toxic or harmful chemicals. While oily rags, used fuel filters, and lead paint chips can all pose health and environmental risks due to their potential for igniting, releasing pollutants, or containing lead, stagnant ditch water does not have these same hazards.

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  • 4. 

    (024) Which shell of the valance electrons determines whether a material is a good or poor conductor of electricity?

    • Outermost shell

    • Middle shell

    • Second shell

    • First shell

    Correct Answer
    A. Outermost shell
    Explanation
    The outermost shell of valence electrons determines whether a material is a good or poor conductor of electricity. This is because the outermost shell is responsible for the bonding and interaction of atoms in a material. If the outermost shell is filled or close to being filled, the material is more likely to be a poor conductor of electricity, as the electrons are tightly held and not easily free to move and carry electric charge. On the other hand, if the outermost shell is not filled, the material is more likely to be a good conductor of electricity, as the electrons are more loosely held and can move freely to conduct electric current.

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  • 5. 

    (007) Who approves respirators worn by Air Force employees?

    • Bioenvironmental engineer (BE)

    • Base civil engineer

    • Wing safety

    • Supervisor

    Correct Answer
    A. Bioenvironmental engineer (BE)
    Explanation
    Bioenvironmental engineers (BE) are responsible for ensuring the health and safety of Air Force employees. They are trained to assess and approve the use of respirators, which are crucial for protecting individuals from harmful airborne contaminants. BEs have the expertise and knowledge to evaluate the effectiveness and suitability of different respirator models for specific work environments. They play a critical role in ensuring that Air Force employees have the appropriate respiratory protection to safeguard their health while performing their duties.

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  • 6. 

    (017) When disposing of waste water from a fuel tank bottom where do you put it?

    • Sanitary sewer

    • Oil/water seperator

    • Water treatment facility

    • Sewage treatment facility

    Correct Answer
    A. Oil/water seperator
    Explanation
    When disposing of waste water from a fuel tank bottom, it is recommended to put it in an oil/water separator. An oil/water separator is a device that separates oil and other contaminants from water, allowing the water to be safely discharged into the environment. This is important because fuel tank bottoms contain oil and other pollutants that can be harmful to the environment if not properly separated and treated. Using an oil/water separator ensures that the water is properly treated before being discharged.

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  • 7. 

    (040) When a circuit breaker is in an overload condition it will

    • Trip

    • Blow

    • Melt

    • Alarm

    Correct Answer
    A. Trip
    Explanation
    When a circuit breaker is in an overload condition, it will trip. This means that the circuit breaker will automatically open and interrupt the flow of electricity, preventing any further damage or overheating. Tripping is a safety mechanism designed to protect the circuit and the connected devices from excessive current. It helps to prevent fires, electrical shocks, and damage to the electrical system.

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  • 8. 

    (004) After use fuel soaked rags should be placed in 

    • Hazardous waste storage areas

    • Self-closing metal containers

    • Containers filled with water

    • Solid-waste disposal pits

    Correct Answer
    A. Self-closing metal containers
    Explanation
    After use, fuel soaked rags should be placed in self-closing metal containers. This is because fuel soaked rags can be highly flammable and pose a fire hazard. Self-closing metal containers are designed to prevent the escape of flammable vapors and contain any potential fire. Placing the rags in hazardous waste storage areas or solid-waste disposal pits may not provide adequate containment and could increase the risk of a fire. Containers filled with water may not be suitable as the water can evaporate, leaving the rags exposed to ignition sources.

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  • 9. 

    (006) With a second-degree burn, the skin is best described as

    • Reddened

    • Blistered

    • Charred

    • Cooked

    Correct Answer
    A. Blistered
    Explanation
    A second-degree burn is characterized by damage to both the epidermis (outer layer of skin) and the dermis (second layer of skin). This type of burn typically presents with redness, pain, and the formation of blisters. Blistering occurs due to the separation of the damaged epidermis from the underlying dermis, resulting in the accumulation of fluid. Therefore, the correct answer is "Blistered."

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  • 10. 

    (001) What is the flash point of JP-8 jet fuel?

    • -20 degrees F

    • -40 degrees F

    • 100 degrees F

    • 140 degrees F

    Correct Answer
    A. 100 degrees F
    Explanation
    The flash point of JP-8 jet fuel is 100 degrees F. The flash point refers to the minimum temperature at which a substance can ignite when exposed to an open flame or spark. In the case of JP-8 jet fuel, it will not ignite unless the temperature reaches or exceeds 100 degrees F. This information is crucial for handling and storing the fuel safely to prevent accidents or fires.

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  • 11. 

    (008) What type of respirator will water and fuel system maintenance (WFM) personnel use for immediate danger to life and health (IDLH) conditions?

    • NBC gas mask

    • Air purifier

    • Supplied-air respirator

    • Dual filter air purifying with battery backup

    Correct Answer
    A. Supplied-air respirator
    Explanation
    WFM personnel will use a supplied-air respirator for immediate danger to life and health (IDLH) conditions. This type of respirator provides a continuous supply of clean air from a remote source, ensuring that the wearer is not exposed to any contaminants in the environment. It is the most effective option for protecting against hazardous substances in the air, such as those found in water and fuel systems. NBC gas masks, air purifiers, and dual filter air purifying masks with battery backup are not specifically designed for IDLH conditions and may not provide adequate protection.

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  • 12. 

    (009) Where can you find most standard and some technical Air Force publications?

    • On file at the base library

    • On the Air Force publishing website

    • In a pouch attached to the associated equipment

    • In the files maintained by the squadron historian

    Correct Answer
    A. On the Air Force publishing website
    Explanation
    Most standard and some technical Air Force publications can be found on the Air Force publishing website. This is a centralized platform where the Air Force publishes and distributes its official publications. It is easily accessible to Air Force personnel and provides a convenient way to access and download the necessary publications. The base library may have some publications, but the Air Force publishing website is the primary source for these materials. There is no mention of a pouch attached to the associated equipment or files maintained by the squadron historian, so these options can be ruled out.

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  • 13. 

    (003) How many feet per second (fps) is considered normal flow through a pipeline?

    • 3 psi

    • 5 psi

    • 7-12 psi

    • 12-15 psi

    Correct Answer
    A. 7-12 psi
    Explanation
    The correct answer is 7-12 psi. This range of pressure is considered normal flow through a pipeline. It indicates that the flow of fluid is at an appropriate level and the pipeline is functioning efficiently. Higher or lower pressure levels may indicate issues with the pipeline, such as blockages or leaks. Therefore, maintaining a pressure within the range of 7-12 psi is important for proper pipeline operation.

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  • 14. 

    (006) What should you do if a conscious coworker has swallowed JP-8?

    • Start cardio pulmonary resuscitation (CPR) immediately

    • Remove the co-worker from the area immediately

    • Give the person four or five glasses of water

    • Induce vomiting as soon as possible

    Correct Answer
    A. Give the person four or five glasses of water
    Explanation
    If a conscious coworker has swallowed JP-8, giving the person four or five glasses of water is the correct action to take. Water can help dilute the chemical and reduce its effects on the body. It is important to provide immediate assistance to the coworker by giving them water to drink. This can help minimize the potential harm caused by swallowing JP-8.

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  • 15. 

    (014) Who do you notify if you see contract workers performing work safely but incorrectly?

    • The contractor

    • Your supervisor

    • Your commander

    • The contract monitor

    Correct Answer
    A. The contract monitor
    Explanation
    If you see contract workers performing work safely but incorrectly, you should notify the contract monitor. The contract monitor is responsible for overseeing the performance of the contract workers and ensuring that they are following the correct procedures and standards. By notifying the contract monitor, they can take appropriate action to address the incorrect work and ensure that it is corrected. This helps to maintain safety and quality standards on the job site.

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  • 16. 

    (040) What is the first step in replacing a fuse?

    • Get tools

    • Obtain a fuse

    • Call an electrician

    • De-energize the switchbox

    Correct Answer
    A. De-energize the switchbox
    Explanation
    The first step in replacing a fuse is to de-energize the switchbox. This is important to ensure safety and prevent any electrical accidents. By de-energizing the switchbox, you are cutting off the power supply to the fuse, reducing the risk of electric shock or damage to the electrical system. Once the switchbox is de-energized, you can safely proceed with replacing the fuse.

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  • 17. 

    (001) What term describes the temperature at which a liquid actively starts to vaporize?

    • Boiling point

    • Flash point

    • Fire Point

    • Volatility

    Correct Answer
    A. Boiling point
    Explanation
    The boiling point is the temperature at which a liquid starts to vaporize and turn into a gas. It is the point at which the vapor pressure of the liquid equals the atmospheric pressure, causing bubbles to form within the liquid. This process is known as boiling. The other options, flash point and fire point, refer to the temperature at which a liquid produces enough vapor to ignite in the presence of an open flame. Volatility, on the other hand, refers to a liquid's tendency to evaporate at normal temperatures.

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  • 18. 

    (024) A material that allows a large number of free electrons to move through it is called 

    • An insulator

    • A conductor

    • A resistor

    • An ion

    Correct Answer
    A. A conductor
    Explanation
    A conductor is a material that allows a large number of free electrons to move through it. This means that the electrons in the material are not tightly bound to their atoms and can easily flow and carry an electric current. Conductors typically have low resistance to the flow of electrons, making them ideal for conducting electricity.

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  • 19. 

    (029) The most important safety precaution you should apply when using a multimeter is to

    • Select the correct scale

    • Always set your meter to zero

    • Always observe polarity when using the alternating current (AC) meter

    • Never touch the metal probes of either test lead while the circuit is energized

    Correct Answer
    A. Never touch the metal probes of either test lead while the circuit is energized
    Explanation
    When using a multimeter, it is crucial to never touch the metal probes of either test lead while the circuit is energized. This is because the probes are conducting electricity, and touching them can result in electric shock or injury. It is important to ensure that you are wearing appropriate protective gear and following safety guidelines to prevent accidents and ensure personal safety.

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  • 20. 

    (029) Ammeters are used to check for?

    • Current draw (flow)

    • Electrical pressure

    • Specific capacity

    • Resistance

    Correct Answer
    A. Current draw (flow)
    Explanation
    Ammeters are used to check for the current draw or flow in an electrical circuit. They are designed to measure the amount of electric current passing through a particular point in a circuit. By connecting the ammeter in series with the circuit, it allows the user to accurately measure the current flowing through the circuit. This information is important in various electrical applications, as it helps in determining whether the circuit is functioning properly and whether there are any abnormalities in the current flow.

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  • 21. 

    (004) What single element of the fire triangle must we try to eliminate?

    • Air

    • Fuel

    • Heat

    • Vapors

    Correct Answer
    A. Heat
    Explanation
    In order to extinguish a fire, it is necessary to eliminate one of the three elements of the fire triangle: fuel, heat, or oxygen. While fuel and oxygen are necessary for a fire to occur, heat is the element that must be eliminated to extinguish the fire. Heat provides the energy needed for the fire to sustain and continue burning. By removing the heat source or cooling down the area, the fire will be deprived of the energy it needs to continue burning, effectively extinguishing it.

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  • 22. 

    (019) What does a direct drive pump generally use to absorb vibration?

    • Clam shell

    • Universal joint

    • Flexible coupling

    • Mesh gear coupling

    Correct Answer
    A. Flexible coupling
    Explanation
    A direct drive pump generally uses a flexible coupling to absorb vibration. A flexible coupling is designed to connect two shafts while allowing for a small amount of misalignment and absorbing shocks and vibrations. It provides flexibility and helps to reduce stress on the pump and its components, resulting in smoother operation and increased longevity.

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  • 23. 

    (029) What is the resistance of a circuit with an applied voltage of 120 volts and a current flow of 9 amperes?

    • 0.13 Ohms

    • 1.3 Ohms

    • 13.33 Ohms

    • 108 Ohms

    Correct Answer
    A. 13.33 Ohms
    Explanation
    The resistance of a circuit can be calculated using Ohm's Law, which states that resistance is equal to voltage divided by current. In this case, the applied voltage is 120 volts and the current flow is 9 amperes. By dividing the voltage by the current, we get 120/9 = 13.33 Ohms. Therefore, the resistance of the circuit is 13.33 Ohms.

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  • 24. 

    (012) Most Defense Energy Support Center (DESC) emergency projects involve an actual or threatening fuel spill and are of what nature?

    • Containment systems

    • Mission cirtical

    • Environmental

    • Cleanup

    Correct Answer
    A. Environmental
    Explanation
    DESC emergency projects involve actual or threatening fuel spills, which are of an environmental nature. These projects are focused on addressing and mitigating the environmental impact caused by the fuel spills, such as containing and cleaning up the spilled fuel to prevent further contamination and damage to the environment.

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  • 25. 

    (029) The easiest and simplest meter to use for measuring current flow in a circuit is?

    • A voltmeter

    • An ammeter

    • A manometer

    • A clamp-on ammeter

    Correct Answer
    A. A clamp-on ammeter
    Explanation
    A clamp-on ammeter is the easiest and simplest meter to use for measuring current flow in a circuit because it can be easily clamped around a wire without the need for any physical connection to the circuit. This eliminates the need to break the circuit or insert the meter into the circuit, making it convenient and user-friendly. Additionally, the clamp-on ammeter provides accurate readings without requiring any additional circuitry or adjustments.

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  • 26. 

    (034) Devices used in a magnetic across-the-line motor controllers to prevent chatter contact are referred to as

    • Mechanical latches

    • Plastic bumpers

    • Shaded rings

    • An arc chute

    Correct Answer
    A. Shaded rings
    Explanation
    Shaded rings are devices used in a magnetic across-the-line motor controller to prevent chatter contact. Chatter contact refers to the rapid opening and closing of the contacts in the controller, which can cause arcing and damage to the contacts. Shaded rings are designed to create a magnetic field that dampens the movement of the contacts, reducing the likelihood of chatter and improving the overall performance and lifespan of the controller.

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  • 27. 

    (037) What type of motor enclosure is used in fuel systems?

    • Closed

    • Drip-proof

    • Splash-proof

    • Explosion-proof

    Correct Answer
    A. Explosion-proof
    Explanation
    An explosion-proof motor enclosure is used in fuel systems to prevent any sparks or flames from igniting the fuel and causing an explosion. This type of enclosure is designed to contain any potential explosion within the motor, preventing it from spreading to the surrounding environment. It is specifically built to withstand and contain explosive gases or vapors, making it the safest option for motor enclosures in fuel systems.

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  • 28. 

    (038) A motor that operates slowly may have a

    • Deficient voltage supply

    • Ventilation problem

    • Bad conductor

    • Blown fuse

    Correct Answer
    A. Deficient voltage supply
    Explanation
    A motor that operates slowly may have a deficient voltage supply. When a motor does not receive enough voltage, it may not be able to generate enough power to operate at its normal speed. This can result in the motor operating slowly. Other factors such as ventilation problems, a bad conductor, or a blown fuse may also affect the motor's performance, but a deficient voltage supply is the most likely cause for a slow operation.

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  • 29. 

    (002) What is the human response to fuel vapor exposure at 10,000 parts per million (ppm) for 10 minutes?

    • Dizziness

    • Intoxication

    • Nose and throat irritation

    • Mucous membrane irritation and numbness

    Correct Answer
    A. Intoxication
    Explanation
    Exposure to fuel vapor at 10,000 ppm for 10 minutes can lead to intoxication. This means that the person may experience symptoms such as dizziness, impaired coordination, confusion, and potentially loss of consciousness. Intoxication occurs when high levels of a substance, in this case, fuel vapor, enter the body and affect the central nervous system. This can be dangerous and may require immediate medical attention.

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  • 30. 

    (006) What should you do for a person suffering from heat cramps?

    • Induce vomiting

    • Move the victim to shade

    • Remove the victims clothes

    • Give the victim large amounts of water

    Correct Answer
    A. Give the victim large amounts of water
    Explanation
    For a person suffering from heat cramps, giving them large amounts of water is the correct action to take. Heat cramps are often caused by dehydration and electrolyte imbalances, so providing the person with water can help rehydrate their body and restore the balance of electrolytes.

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  • 31. 

    (015) In to how many titles is the Code of Federal Regulations (CFR) divided?

    • 50

    • 40

    • 30

    • 10

    Correct Answer
    A. 50
    Explanation
    The Code of Federal Regulations (CFR) is divided into 50 titles. Each title represents a specific subject area or agency within the federal government. These titles cover a wide range of topics, including agriculture, commerce, energy, transportation, and more. Each title is further divided into chapters, sections, and subsections, providing a comprehensive and organized compilation of federal regulations.

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  • 32. 

    (027) What are the two most common methods of producing voltage?

    • Chemical and mechanical

    • Magnetic and mechanical

    • Chemical and heat

    • Magnetic and heat

    Correct Answer
    A. Chemical and mechanical
    Explanation
    The two most common methods of producing voltage are chemical and mechanical. Chemical methods involve the use of chemical reactions to generate an electric current, such as in batteries. Mechanical methods involve the use of mechanical energy, such as in generators, where a mechanical force is used to rotate a coil of wire within a magnetic field, inducing a voltage. Both chemical and mechanical methods are widely used in various applications to produce voltage and power electrical devices.

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  • 33. 

    (027) What type of current flow cannot be transformed from a higher voltage to a lower voltage?

    • Both alternating current (AC) and direct current (DC)

    • Fluctuating current

    • AC

    • DC

    Correct Answer
    A. DC
    Explanation
    Direct current (DC) is the type of current flow that cannot be transformed from a higher voltage to a lower voltage. This is because DC flows in only one direction and does not change its polarity or magnitude over time. In contrast, alternating current (AC) can be easily transformed from a higher voltage to a lower voltage through the use of transformers, as AC periodically changes its direction and magnitude. Fluctuating current is not a specific type of current flow and does not provide any relevant information to answer the question.

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  • 34. 

    (025) The unified movement of electrons in a specific direction is called

    • Ionization

    • Free electrons

    • Electrical current

    • Electrical potential

    Correct Answer
    A. Electrical current
    Explanation
    Electrical current refers to the flow of electric charge, specifically the movement of electrons in a specific direction. It is the result of the unified movement of electrons, which carry a negative charge, through a conductive medium. The movement of these electrons creates a flow of electric current, allowing the transfer of energy and the operation of electrical devices.

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  • 35. 

    (037) What should be your first check on a motor that seems to be overheating?

    • Load too big for motor

    • Shorted windings

    • Ventilation

    • Wire size

    Correct Answer
    A. Ventilation
    Explanation
    The first check on a motor that seems to be overheating should be ventilation. Poor ventilation can cause a motor to overheat as it prevents the dissipation of heat generated during operation. By ensuring that the motor has proper ventilation, such as checking for blocked air vents or ensuring that the motor is not enclosed in a tight space, the overheating issue can be resolved.

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  • 36. 

    (040) To which effect of current flow does a fuse react?

    • Heat

    • Magnetism

    • Physical shock

    • Chemical change

    Correct Answer
    A. Heat
    Explanation
    A fuse reacts to the effect of current flow by detecting and responding to excessive heat. When the current passing through a circuit exceeds the fuse's rated capacity, the resistance in the fuse causes it to heat up. This excessive heat then melts a small piece of metal within the fuse, breaking the circuit and preventing further current flow. Therefore, the correct answer is heat.

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  • 37. 

    (019) How many different classes of levers are there?

    • Two

    • Three

    • Four

    • Five

    Correct Answer
    A. Three
    Explanation
    There are three different classes of levers. Levers are simple machines that consist of a rigid bar or beam that is able to rotate around a fixed point called a fulcrum. The three classes of levers are determined by the relative positions of the fulcrum, the effort (force applied to the lever), and the load (the resistance being moved). In a first-class lever, the fulcrum is located between the effort and the load. In a second-class lever, the load is located between the fulcrum and the effort. In a third-class lever, the effort is located between the fulcrum and the load.

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  • 38. 

    (026) When do magnetic lines of force in a magnet cross?

    • When the north pole of a magnet is placed near the north pole of another magnet

    • When the south pole of a magnet is placed near the north pole of another magnet

    • When a permanent magnet and a temporary magnet are put together

    • Magnetic lines of force never cross each other

    Correct Answer
    A. Magnetic lines of force never cross each other
    Explanation
    Magnetic lines of force never cross each other because they represent the direction of the magnetic field. The lines always form closed loops, flowing from the north pole to the south pole of a magnet. 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. Therefore, magnetic lines of force never cross each other.

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  • 39. 

    (028) Which of the following best describes a schematic drawing?

    • Used to show the wiring is marked numerically and alphabetically

    • Sometimes called a one-line diagram and is very useful in troubleshooting

    • Can be used to help you connect all the wiring and trace any part of the circuit

    • Internal connections are not shown and would be of little help in troubleshooting

    Correct Answer
    A. Sometimes called a one-line diagram and is very useful in troubleshooting
    Explanation
    A schematic drawing, sometimes called a one-line diagram, is a visual representation of an electrical circuit. It is useful in troubleshooting because it shows the connections between components and helps in understanding the flow of electricity. However, it does not show internal connections and therefore may not be helpful in troubleshooting issues within individual components.

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  • 40. 

    (033) A step-up transformer produces a secondary voltage that is

    • Higher than the primary voltage and a secondary current lower than the primary current

    • Lower than the primary voltage and a secondary current higher than the primary current

    • And current higer than the voltage and current in the primary

    • Answer option 4And current lower than the voltage and current in the primary

    Correct Answer
    A. Higher than the primary voltage and a secondary current lower than the primary current
    Explanation
    A step-up transformer is designed to increase the voltage level from the primary side to the secondary side. This is achieved by having more turns in the secondary coil compared to the primary coil. As a result, the secondary voltage is higher than the primary voltage. Additionally, according to the transformer equation, the ratio of voltage to current remains constant. Since the secondary voltage is higher, the secondary current will be lower than the primary current to maintain this ratio. Therefore, the correct answer is "Higher than the primary voltage and a secondary current lower than the primary current."

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  • 41. 

    (036) What type of couplings do large motors usually use?

    • Simple and compound

    • First and second class

    • Single and multiple

    • Rigid and flexible

    Correct Answer
    A. Rigid and flexible
    Explanation
    Large motors usually use a combination of rigid and flexible couplings. Rigid couplings are used to provide a strong and solid connection between the motor and the driven equipment, ensuring efficient power transmission and precise alignment. On the other hand, flexible couplings are used to compensate for any misalignment between the motor and the driven equipment, absorb shocks and vibrations, and protect the motor from damage. The combination of both types of couplings allows for a balance between rigidity and flexibility, ensuring optimal performance and longevity of the motor.

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  • 42. 

    (018) When pressure is no longer applied to open an automatic valve, which of the following unbalanced forces closes it?

    • Fuel pressure and diaphragm weight

    • Fuel pressure and spring tension

    • Gravity and diaphragm weight

    • Gravity and spring tension

    Correct Answer
    A. Gravity and spring tension
    Explanation
    When pressure is no longer applied to open an automatic valve, the unbalanced forces that close it are gravity and spring tension. Gravity pulls the valve downward, while the spring tension pulls the valve back to its closed position. These two forces work together to ensure that the valve closes securely when pressure is released.

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  • 43. 

    (025) According to Ohm's law, how much voltage is required to push 1 ampere of current through 1 ohm of resistance?

    • 0.1 Volt

    • 1 Volt

    • 10 Volts

    • 100 Volts

    Correct Answer
    A. 1 Volt
    Explanation
    According to Ohm's law, the voltage required to push 1 ampere of current through 1 ohm of resistance is 1 Volt. Ohm's law states that the voltage (V) is equal to the current (I) multiplied by the resistance (R), or V = I * R. In this case, the current is 1 ampere and the resistance is 1 ohm, so the voltage required is 1 Volt.

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  • 44. 

    (032) A centrifugal switch is used in a single-phase motor to

    • De-energize field windings

    • De-energize start windings

    • Engage the run windings

    • Engage the power leads

    Correct Answer
    A. De-energize start windings
    Explanation
    A centrifugal switch is used in a single-phase motor to de-energize the start windings. The start windings are responsible for providing the initial torque to start the motor. Once the motor reaches a certain speed, the centrifugal switch is activated by the centrifugal force and opens the circuit to the start windings, disconnecting them from the power source. This prevents the start windings from overheating and allows the motor to continue running using only the run windings.

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  • 45. 

    (034) Normally, an across-the-line motor control stops and starts a motor and provides some type of

    • Motor over-current protection

    • Lightning protection

    • Speed control

    • Frequency control

    Correct Answer
    A. Motor over-current protection
    Explanation
    An across-the-line motor control is typically used to start and stop a motor, and it also provides motor over-current protection. This means that it monitors the current flowing through the motor and will automatically shut off power to the motor if the current exceeds a certain limit. This protection is important as it helps prevent damage to the motor and other equipment in the event of a current overload.

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  • 46. 

    (022) Which of the following units of measurement would indicate volume of flow?

    • Barrels per hour

    • Meters per hour

    • Feet per minute

    • Inches per second

    Correct Answer
    A. Barrels per hour
    Explanation
    Barrels per hour would indicate volume of flow because barrels is a unit of volume and hour is a unit of time. By measuring the flow in barrels per hour, we can determine the amount of volume that is flowing within a specific time frame.

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  • 47. 

    (022) Which of the following units of measurement would indicate velocity of flow?

    • Feet per second

    • Gallons per minute

    • Cubic feet per second

    • Cubic gallons per minute

    Correct Answer
    A. Feet per second
    Explanation
    The unit of measurement that indicates velocity of flow is feet per second. This unit measures the distance traveled in feet divided by the time taken in seconds, giving the speed at which the flow is moving. Gallons per minute measures the volume of flow, not the velocity. Cubic feet per second also measures the volume of flow, but in a different unit. Cubic gallons per minute is not a valid unit of measurement.

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  • 48. 

    (025) Which of these is the smallest current that can be fatal under certain circumstances?

    • One-half of one amp

    • One-third of one amp

    • One-eigth of one amp

    • One-tenth of one amp

    Correct Answer
    A. One-tenth of one amp
    Explanation
    The smallest current that can be fatal under certain circumstances is one-tenth of one amp. This suggests that even a very small amount of current can be dangerous and potentially fatal in certain situations. It emphasizes the importance of electrical safety and the need to be cautious when dealing with electricity.

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  • 49. 

    (029) Ohmmeters are used to check for?

    • Current draw (flow)

    • Electrical pressure

    • Specific capacity

    • Resistance

    Correct Answer
    A. Resistance
    Explanation
    Ohmmeters are used to check for resistance. Resistance is a measure of how much a material or component opposes the flow of electric current. By measuring the resistance, an ohmmeter can determine if there are any faults or abnormalities in the electrical circuit. It is an essential tool for troubleshooting electrical systems and ensuring that they are functioning properly.

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Quiz Review Timeline (Updated): Feb 5, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Feb 05, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 22, 2013
    Quiz Created by
    Pggomoljak328

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