Basic Electrical Theory Assessment Test

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  • 1/100 Questions

    A meter used to measure both AC and DC voltage and current is known as which of the following:

    • An ohms meter
    • A multimeter
    • A resistance meter
    • None of the above
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About This Quiz


The Basic Electrical Quiz is designed to challenge your understanding of key concepts in electrical science. This quiz covers topics like current, voltage, resistance, circuits, and basic electrical laws such as Ohm’s Law. Each question has been carefully crafted to assess your grasp of theoretical concepts and their practical applications in real-life scenarios.

If you are a student brushing up on basics, a professional revisiting core principles, or simply someone curious about how electricity works, this basic electrical test is a great way to gauge your understanding. It encourages analytical thinking and helps identify areas for improvement. With a structured approach, this quiz ensures a balanced evaluation of your electrical knowledge, making it an essential tool for learners at any level.

Basic Electrical Theory Assessment Test - Quiz

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  • 2. 

    Of all of the materials used for insulation, which of the following has the highest electrical breakdown strength and the longest life:

    • Rubber

    • Cloth

    • Impregnated paper

    • Colored vinyl

    Correct Answer
    A. Rubber
    Explanation
    Rubber has the highest electrical breakdown strength and the longest life compared to the other materials listed. Rubber is a good insulator and can withstand high voltages without breaking down. It also has excellent durability and can last for a long time, making it a reliable choice for insulation.

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  • 3. 

    Rearranging  the control components in an electrical diagram in order to simplify tracing of a circuit is an example of a schematic diagram.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Rearranging the control components in an electrical diagram can indeed simplify tracing of a circuit. By rearranging the components in a logical and organized manner, it becomes easier to understand the flow of the circuit and identify any potential issues or errors. This can be especially helpful when troubleshooting or making modifications to the circuit. Therefore, it is accurate to say that rearranging the control components in an electrical diagram is an example of a schematic diagram.

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  • 4. 

    Bonding safely conducts any fault currents which may arise.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Bonding is the process of connecting all metallic components of an electrical system together to create a safe path for fault currents. This helps to prevent electrical shocks and fires by ensuring that any fault currents are safely conducted away from people and equipment. Therefore, the statement that bonding safely conducts any fault currents is true.

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  • 5. 

    Electrical appliances shall be installed in parallel in order to make the operation of each appliance in- dependent of the others.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When electrical appliances are installed in parallel, each appliance receives the full voltage of the circuit independently of the others. This means that the operation of one appliance does not affect the operation of another. If one appliance fails, it does not interrupt the circuit path of the others. In contrast, if appliances were installed in series, the failure of one appliance would break the circuit and potentially stop the operation of all other appliances in the same circuit. 

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  • 6. 

    In a 3Ø circuit, how many electrical degrees separate each phase:

    • 3

    • 120

    • 180

    • 360

    Correct Answer
    A. 120
    Explanation
    In a 3-phase circuit, each phase is separated by 120 electrical degrees. This means that the phase angles of the three phases are evenly spaced apart by 120 degrees. This is important in understanding the relationship and timing between the different phases in a 3-phase system.

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  • 7. 

    Some copper conductors are tinned to help prevent chemical reaction:

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Copper conductors are sometimes tinned to prevent chemical reactions. Tinning involves coating the copper with a thin layer of tin. This layer acts as a barrier, preventing the copper from coming into direct contact with substances that could cause chemical reactions, such as moisture or corrosive materials. Tinning also improves the solderability of the copper, making it easier to join with other components. Overall, tinning helps to protect the copper conductor and maintain its performance and longevity.

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  • 8. 

    In order to change the rotation of a DC series motor, which of the following must be done:

    • The motor must be converted to AC.

    • F1 and F2 must be reversed.

    • The capacitor leads must be reversed.

    • The frequency must be altered.

    Correct Answer
    A. F1 and F2 must be reversed.
    Explanation
    To change the rotation of a DC series motor, reversing the connections of F1 and F2 is necessary. This is because the direction of current flow through the armature determines the direction of rotation. By reversing the connections, the current flow is reversed, resulting in a change in the motor's rotation. The other options mentioned, such as converting the motor to AC, reversing the capacitor leads, or altering the frequency, are not relevant to changing the rotation of a DC series motor.

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  • 9. 

    Conductors are materials that can be charged by rubbing them against other wires.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Conductors are materials that allow the flow of electric charge. They can become charged through various methods such as induction or contact with a charged object, but not specifically by rubbing them against other wires. Therefore, the statement that conductors can be charged by rubbing them against other wires is false.

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  • 10. 

    In an alternator, frequency is determined by which of the following?

    • Motor size

    • Rotation speed of the armature

    • Voltage

    • All of the above

    Correct Answer
    A. Rotation speed of the armature
    Explanation
    The frequency in an alternator is determined by the rotation speed of the armature. As the armature rotates, it creates a changing magnetic field, which induces a voltage in the stator windings. The frequency of this voltage is directly proportional to the rotation speed of the armature. Therefore, by increasing or decreasing the rotation speed, the frequency of the alternator output can be adjusted. Motor size and voltage do not directly determine the frequency in an alternator.

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  • 11. 

    The peak value of AC voltage determines the breakdown voltage of insulation.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The peak value of AC voltage refers to the maximum value that the voltage reaches during each cycle. The breakdown voltage of insulation is the voltage at which the insulation material fails and allows current to flow through it. Therefore, it is logical to conclude that the peak value of AC voltage determines the breakdown voltage of insulation.

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  • 12. 

    Two transmission wires create a corona when which of the following exists:

    • The wires have a high potential difference.

    • The wires are installed overlapping or too close together.

    • The wires are spaced too far apart.

    • None of the above

    Correct Answer
    A. The wires are installed overlapping or too close together.
    Explanation
    When transmission wires are installed overlapping or too close together, it creates a corona. The corona is a phenomenon that occurs when the electric field surrounding the wires ionizes the surrounding air molecules, causing a faint glow or hissing sound. This can lead to energy loss, increased electrical resistance, and interference with communication systems. Therefore, the installation of transmission wires in close proximity or overlapping can result in the occurrence of corona.

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  • 13. 

    A metal halide lamp is also referred to as a quartz lamp.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A metal halide lamp is indeed referred to as a quartz lamp because it contains a quartz arc tube that is filled with metal halide gases. This type of lamp produces a bright white light and is commonly used in outdoor lighting, stadiums, and other applications where high-intensity lighting is required. The quartz material is used in the lamp because it can withstand the high temperatures generated by the arc discharge. Therefore, the statement "A metal halide lamp is also referred to as a quartz lamp" is true.

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  • 14. 

    The most power lost in the form of heat would come from which of the following:

    • A short circuit

    • Resistance

    • “Z”

    • None of the above

    Correct Answer
    A. Resistance
    Explanation
    Resistance is the correct answer because when current flows through a resistor, it encounters resistance which causes energy to be converted into heat. This heat is a form of power loss and is commonly known as Joule heating. In a short circuit, the resistance is very low, so the power loss in the form of heat is also low. The option "Z" is not explained, so it cannot be determined if it causes power loss. Therefore, resistance is the most likely source of power loss in the form of heat.

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  • 15. 

    An incandescent lamp filament is made of nickel.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    An incandescent lamp filament is not made of nickel. It is typically made of tungsten, which has a high melting point and can withstand the high temperatures required for the filament to glow and produce light. Nickel is not commonly used for incandescent lamp filaments because it has a lower melting point and would not be able to withstand the heat generated by the electric current passing through it.

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  • 16. 

    The rate of flow of the electrical charges through a conductor is which of the following:

    • Watts

    • Ohms

    • Voltage

    • Current

    Correct Answer
    A. Current
    Explanation
    The rate of flow of electrical charges through a conductor is referred to as current. Current is measured in units called amperes (A). It represents the amount of charge passing through a point in the circuit per unit time. Current is essential for the functioning of electrical devices as it provides the necessary energy for them to operate.

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  • 17. 

    When reduced to the most nominal component, the smallest element of matter is which of the following:

    • One ohm of electrical current

    • An atom

    • Electrons

    • None of the above

    Correct Answer
    A. Electrons
    Explanation
    Electrons are the smallest element of matter among the provided choices, as they are fundamental subatomic particles that are smaller than atoms and are crucial components of all matter.

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  • 18. 

    Which of the following terms is used to describe the inductive action, which causes current to flow on the outer surface of a conductor:

    • Halo Effect

    • Inductance

    • Skin effect

    • Insulated par value

    Correct Answer
    A. Inductance
    Explanation
    Inductance is the correct term used to describe the inductive action that causes current to flow on the outer surface of a conductor. Inductance refers to the property of a conductor or circuit to oppose any change in the flow of current. When there is a change in current, an electromagnetic field is created, which induces a voltage that causes current to flow on the outer surface of the conductor. This phenomenon is known as skin effect, where the current is concentrated on the surface of the conductor rather than evenly distributed throughout its cross-section.

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  • 19. 

    An electrical lighting timer switch is generally connected in parallel with the lighting.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    An electrical lighting timer switch is generally connected in series with the lighting, not in parallel. When connected in series, the timer switch interrupts the flow of electricity to the lighting based on the programmed schedule. In contrast, connecting it in parallel would mean that the lighting would receive power regardless of the timer's settings, which defeats the purpose of having a timer switch.

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  • 20. 

    To connect an ammeter in series, must the circuit be opened at the voltage source and connected to the meter at the other end?

    • True

    • False

    Correct Answer
    A. False
    Explanation
    To connect an ammeter in series, the circuit does not need to be opened at the voltage source. Instead, the ammeter is connected in series with the other components of the circuit, allowing the current to flow through it. This allows the ammeter to measure the current passing through the circuit without interrupting the flow of current. Therefore, the statement is false.

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  • 21. 

    If a transformer ratio is 20/1,  then which of the following is true:

    • For every 20 turns in the primary, there is one turn in the secondary.

    • The primary voltage is 20 times greater than that of the secondary.

    • For every 20 rotations in the secondary, there is one rotation in the primary.

    • None of the above

    Correct Answer
    A. The primary voltage is 20 times greater than that of the secondary.
    Explanation
    The correct statement is: "For every 20 turns in the primary, there is one turn in the secondary." In a transformer, the turns ratio indicates the ratio of the number of turns in the primary coil to the number of turns in the secondary coil. In this case, a turns ratio of 20/1 means that for every 20 turns in the primary coil, there is one turn in the secondary coil. This ratio determines the relationship between the voltages in the primary and secondary circuits.

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  • 22. 

    In order to calculate watt hours, which of the following formulas must be used:

    • E x I x T²

    • Amps/Volts

    • E x I x T

    • 24 /(E x I x T )

    Correct Answer
    A. E x I x T
    Explanation
    Watt-hours, a measure of electrical energy consumption, are calculated by multiplying voltage (E), current (I), and time (T). This formula accounts for the product of electrical potential (voltage), the rate of flow of electric charge (current), and the duration of usage (time), providing a comprehensive measure of energy usage.

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  • 23. 

    Ground fault protection for personnel on a 120 volt single-phase circuit is based on which of the following:

    • Ungrounded current between conductors

    • Unbalanced current between the grounded and ungrounded conductor

    • Overload in the current carrying conductor

    • Excessive voltage in the grounding conductor

    Correct Answer
    A. Unbalanced current between the grounded and ungrounded conductor
    Explanation
    Ground fault protection for personnel on a 120 volt single-phase circuit is based on the unbalanced current between the grounded and ungrounded conductor. This means that the protection system is designed to detect any difference in current flowing through the two conductors. If there is an imbalance, it indicates that some current is flowing through an unintended path, such as through a person or the ground, and the protection system will quickly interrupt the circuit to prevent electric shock. This type of protection is crucial for ensuring the safety of individuals working with electrical systems.

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  • 24. 

    A wiring system has two lengths of wires, where wire A has a resistance of 10 ohms and wire B is three times the length of wire A with two times the cross-sectional area, which means that resistance of wire B is equal to which of the following:

    • 30 ohms

    • 20 ohms

    • 15 ohms

    • 10 ohms

    Correct Answer
    A. 15 ohms
  • 25. 

    A negative charge will do which of the following: I.    Interact with negative charges II.   Interact with positive charges III. Cause a short in a positive system  

    • I & III

    • I & II

    • I only

    • All of the above

    Correct Answer
    A. I & II
    Explanation
    A negative charge will interact with negative charges (I) because like charges repel each other. It will also interact with positive charges (II) because opposite charges attract each other. However, it will not cause a short in a positive system (III) as a short circuit occurs when there is an unintended path for current to flow, usually due to a break or fault in the circuit.

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  • 26. 

    For electroplating power, which of the following generators should be used?

    • Separately excited

    • Delta system

    • Split phase

    • None of the above

    Correct Answer
    A. Separately excited
    Explanation
    A separately excited generator provides a stable and controlled output voltage, which is essential for electroplating. Electroplating requires precise voltage and current levels to ensure uniform coating quality. These generators allow independent adjustment of the field winding, enabling consistent operation even under varying load conditions, making them ideal for such applications.

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  • 27. 

    If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is equal to which of the following:

    • 19.5 :1

    • 1 :19.5

    • 180 :1

    • 3 :1

    Correct Answer
    A. 19.5 :1
    Explanation
    To find the ratio of the transformer, we divide the primary voltage by the secondary voltage:
    Ratio = Primary Voltage / Secondary Voltage
    Given: Primary Voltage (Vp) = 117 volts Secondary Voltage (Vs) = 6 volts
    Ratio = Vp / Vs Ratio = 117 / 6 Ratio ≈ 19.5
    So, the ratio of the transformer is approximately 19.5:1.

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  • 28. 

    What is the equivalent of resistance among the following options in an open circuit?

    • 0.012 ohms

    • 1 coulomb

    • Zero

    • Infinity

    Correct Answer
    A. Infinity
    Explanation
    An open circuit means there is no continuous path for current to flow, resulting in infinite resistance. Since current cannot pass through an open circuit, resistance becomes effectively unmeasurable and infinitely large. This is a fundamental electrical property and a common concept in circuit analysis. None of the other options accurately represent the resistance of an open circuit.

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  • 29. 

    Frequency is measured in which of the following:

    • Voltage

    • Watts

    • Hertz

    • None of the above

    Correct Answer
    A. Hertz
    Explanation
    Frequency is a measure of how many cycles or oscillations occur in a given time period. It is commonly used to describe the number of times an electrical signal or wave completes a full cycle in one second. The unit used to measure frequency is Hertz (Hz), which represents one cycle per second. Therefore, the correct answer is Hertz.

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  • 30. 

    Where the current flow through a conductor is greatest will be the point where the voltage drop is the lowest.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false. The point where the current flow through a conductor is greatest will likely experience the highest voltage drop, not the lowest. This is due to the relationship described by Ohm's law, which states that voltage (V) is equal to the product of current (I) and resistance (R), represented by the equation V = IR. When the current is high and resistance remains constant, the voltage drop across the conductor will also be high.

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  • 31. 

    If a motor enclosure is designed to contain sparks or flashes that could ignite surrounding vapors or gases, then the enclosure is considered to be which of the following:

    • Ventilated

    • Explosion proof

    • Explosion resistant

    • Fire proof

    Correct Answer
    A. Explosion proof
    Explanation
    An enclosure designed to contain sparks or flashes that could ignite surrounding vapors or gases is termed "explosion-proof." These enclosures prevent ignition by confining sparks within the enclosure, minimizing the risk of explosions in hazardous environments where flammable gases or vapors are present.

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  • 32. 

     Which of the following is not applicable to an AC system?

    • It cannot be transformed.

    • It develops eddy currents.

    • It can interfere with communications lines.

    • It is suitable for charging batteries.

    Correct Answer
    A. It cannot be transformed.
    Explanation
    AC systems can be transformed using transformers to change the voltage level, which is a key advantage of AC over DC systems. This transformation is not applicable to DC systems. Therefore, the statement "It can not be transformed" is not applicable to an AC system.

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  • 33. 

    Power factor is equal to which of the following:

    • Apparent power multiplied by true power

    • True power divided by apparent power

    • Watts multiplied by amps

    • None of the above

    Correct Answer
    A. True power divided by apparent power
    Explanation
    The power factor (PF) is the ratio of true power (measured in watts) to apparent power (measured in volt-amperes). It represents the efficiency of electrical power usage, where a PF of 1 indicates maximum efficiency. Mathematically, PF = True Power / Apparent Power. A high PF signifies efficient energy utilization with minimal losses.

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  • 34. 

    The sum of series voltage drops equals the applied voltage.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because the sum of series voltage drops does not always equal the applied voltage. In a series circuit, the total voltage across the circuit is equal to the sum of the individual voltage drops across each component. Therefore, the sum of the series voltage drops is always less than or equal to the applied voltage.

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  • 35. 

    Which of the following materials is used on conduits inside and outside of a box:

    • Bushings

    • Couplings

    • Lock nuts

    • All of the above

    Correct Answer
    A. Couplings
    Explanation
    Couplings are the correct answer because they are used on conduits both inside and outside of a box. Couplings are fittings that connect two sections of conduit together, allowing for a secure and continuous pathway for electrical wires. They are commonly used in electrical installations to join conduit sections and provide a means of pulling wires through the conduit. Therefore, couplings are essential components for maintaining the integrity and functionality of conduits inside and outside of a box.

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  • 36. 

    A three horsepower motor is equivalent to which of the following in watts:

    • 2237.1

    • 3000 watts

    • None of the above

    • 746 watts

    Correct Answer
    A. 2237.1
    Explanation
    To convert horsepower (hp) to watts (W), you can use the following conversion factor:
    1 horsepower (hp) = 745.7 watts (W)
    So, to convert a 3-horsepower motor to watts:
    3 hp * 745.7 W/hp = 2237.1 watts (W)
    A 3-horsepower motor is equivalent to 2237.1 watts (W).

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  • 37. 

    A wire secured at one end with the other end fastened to a pole under tension is known as which of the following:

    • Messenger wire

    • A service drop

    • A guy wire

    • None of the above

    Correct Answer
    A. A service drop
    Explanation
    A wire secured at one end with the other end fastened to a pole under tension is known as a service drop. A service drop is commonly used in electrical installations to deliver power from a utility pole to a building or structure. It is typically made of insulated conductors and is responsible for providing electricity to the premises. Messenger wire is used to support other wires, while a guy wire is used to provide stability to structures like poles or towers. Therefore, neither of these options accurately describes the given scenario.

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  • 38. 

    Electromagnetic induction involves a substance becoming a magnet when it is placed next to another magnet.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Electromagnetic induction does not involve a substance becoming a magnet when it is placed next to another magnet. Instead, it refers to the process of generating an electric current in a conductor by changing the magnetic field around it. This can be achieved by moving a magnet near a conductor or by changing the current in a nearby conductor.

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  • 39. 

    The armature reaction in an alternator is magnetizing at lagging loads.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The armature reaction in an alternator is not magnetizing at lagging loads. Armature reaction refers to the effect of the magnetic field produced by the armature current on the main magnetic field. At lagging loads, the armature reaction is demagnetizing, meaning it weakens the main magnetic field. Therefore, the correct answer is false.

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  • 40. 

    In order to adjust the voltage of a constant speed DC generator, the field voltage must be changed.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    In order to adjust the voltage of a constant speed DC generator, the field voltage does not need to be changed. The voltage of a constant speed DC generator can be adjusted by changing the load resistance or by using a voltage regulator. The field voltage controls the strength of the magnetic field, which affects the generator's output voltage, but it is not the only factor that can be adjusted to change the voltage.

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  • 41. 

    If the power factor of a circuit is increased, then which of the following occurs:

    • The active power is increased.

    • The reactive power is decreased.

    • Both of the above

    • None of the above

    Correct Answer
    A. The reactive power is decreased.
    Explanation
    When the power factor of a circuit is increased, it means that the circuit becomes more efficient in converting electrical power into useful work. This is because the power factor is a measure of how effectively the circuit uses the available power. A higher power factor indicates that there is less reactive power in the circuit, which means that the circuit is drawing less current from the power source. As a result, the reactive power is decreased, leading to a more efficient utilization of electrical power. Therefore, the correct answer is that the reactive power is decreased.

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  • 42. 

    In order to correct a low power factor, which of the following should be checked first?

    • Resistance

    • Watts

    • Inductive load

    • All of the above

    Correct Answer
    A. Inductive load
    Explanation
    To correct a low power factor, the first thing that should be checked is the inductive load. Inductive loads, such as motors and transformers, can cause a lagging power factor. By reducing the inductive load or using power factor correction devices, the power factor can be improved. Resistance and watts do not directly affect the power factor, so they would not be the first things to check in this case.

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  • 43. 

    What does it cost per year (at 8 cents per kWh) for the power loss of a 12 AWG circuit conductor (100ft long) that has a total resistance of 0.40 ohms and a current flow of 16A? (Approx)

    • $300.16

    • $71.76

    • $170.6

    • $190.3

    Correct Answer
    A. $71.76
    Explanation
    Here's how to calculate the approximate cost per year of the power loss in the conductor:
    Calculate Power Loss:
    We know the formula for power loss (P) in a conductor: P = I² * R
    P = (16A)² * 0.40Ω = 102.4 watts (W)
    Convert Power Loss to kWh per year:
    We need to convert watts (instantaneous power) to kilowatt-hours (kWh), considering the power loss happens throughout the year. We'll assume the circuit is operational continuously for this estimation.
    Hours per year: 365 days/year * 24 hours/day = 8760 hours/year
    Energy loss (kWh) = Power loss (W) * Time (hours) / 1000 (conversion factor)
    Energy loss (kWh) = 102.4 W * 8760 hours/year / 1000 = 897.024 kWh/year (approximately)
    Calculate Cost per Year:
    Cost per kWh = $0.08
    Annual Cost = Energy loss (kWh) * Cost per kWh
    Annual Cost = 897.024 kWh/year * $0.08/kWh = $71.76 (approximately)
    Therefore, the estimated cost per year for the power loss in the conductor is $71.76.
    Note: This is an approximation based on the assumptions of continuous operation and a constant current flow. In reality, the actual cost may vary depending on the usage pattern of the circuit.

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  • 44. 

    The wattage rating of a resistor determines its ability to absorb heat.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The wattage rating of a resistor does not determine its ability to absorb heat. The wattage rating of a resistor actually determines its power handling capacity, which is the amount of power it can safely dissipate without overheating. The ability to absorb heat is determined by the thermal conductivity and design of the resistor, not its wattage rating.

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  • 45. 

    The temperature of the area surrounding a conductor is known as the ambient temperature.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Ambient temperature refers to the temperature of the surrounding environment or the immediate area around an object, in this case, a conductor. In the context of electrical conductors and devices, ambient temperature is an important factor because it can affect the performance and characteristics of the conductor. For example, the resistance of a conductor may vary with temperature, and the conductor's ability to dissipate heat depends on the ambient temperature.

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  • 46. 

    Inductance and capacitance are not considerations in a DC current for which of the following reasons:

    • DC supply has no frequency

    • DC supply carries power equally

    • Both of the above

    • None of the above

    Correct Answer
    A. DC supply carries power equally
    Explanation
    Inductance and capacitance are not considerations in a DC current because DC supply has no frequency. In AC circuits, inductance and capacitance play a significant role as they cause impedance and affect the flow of current. However, in DC circuits, the current flows in one direction without any change in direction or frequency, making inductance and capacitance irrelevant. Additionally, the DC supply carries power equally, meaning it delivers a constant amount of power throughout the circuit, further eliminating the need for inductance and capacitance considerations.

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  • 47. 

    If a series circuit has unequal resistances throughout the circuit, then which of the following is true:

    • The lowest resistance has the highest current.

    • The lowest resistance has the highest voltage.

    • The highest resistance has the highest voltage.

    • The highest resistance has the highest current.

    Correct Answer
    A. The highest resistance has the highest voltage.
    Explanation
    In a series circuit, the current remains the same throughout all components. According to Ohm's law (V = IR), voltage is directly proportional to resistance. Therefore, in a series circuit with unequal resistances, the component with the highest resistance will have the highest voltage drop. So, the correct statement is:
    The highest resistance has the highest voltage.

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  • 48. 

    Electric motors operate on the principal of induction and repulsion.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Electric motors operate on the principle of electromagnetic induction, not induction and repulsion. Induction is the process by which a changing magnetic field induces an electric current in a conductor, which is the basic principle behind the operation of electric motors. Repulsion, on the other hand, refers to the force between two like charges or magnetic poles, which is not the principle that electric motors rely on. Therefore, the statement is false.

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  • 49. 

    In a coil, the higher the level of self-inductance:

    • The lower the level of resistance will be

    • The longer the delay will be in establishing current through it

    • The greater the level of flux produced will be

    • None of the above

    Correct Answer
    A. The longer the delay will be in establishing current through it
    Explanation
    The higher the level of self-inductance in a coil, the longer the delay will be in establishing current through it. This is because self-inductance is a property of a coil that opposes changes in current. When the level of self-inductance is higher, the coil resists changes in current more, resulting in a longer delay in establishing current through it.

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Matt Balanda |BS (Aerospace Engineering) |
Science Teacher
Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.

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  • Jul 05, 2013
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