Electrical Quiz Set B

A "pull box" is a type of electrical box that is specifically designed to facilitate the pulling of wires or cables through it. It typically has a larger size and a removable cover, allowing easy access for pulling and routing wires. This type of box is commonly used in electrical installations where multiple wires or cables need to be pulled through long distances or complex pathways. The term "pull box" refers to its main function of making the wire pulling process more efficient and convenient.

Grounding refers to the process of connecting an electrical system to the earth or a conducting body that acts as the earth. This connection is important for safety reasons as it helps to prevent electrical shock and damage to equipment. By grounding a system, any excess electrical charge can be safely discharged into the earth, reducing the risk of electric shock to individuals and preventing damage to the system. Therefore, the correct answer is "Grounded."

Resistance is the correct answer because it refers to the opposition to the flow of electrons in a circuit. In simple terms, resistance is the property of a material or component that hinders the flow of electric current. It is measured in ohms and is responsible for reducing the current in a circuit. The higher the resistance, the lower the current flow, and vice versa.

Current is the correct answer because it refers to the flow of electrons or electric charges in a circuit. It is the rate at which electric charges pass through a conductor, measured in amperes (A). Current is driven by a voltage source and is influenced by the resistance in the circuit. It is an essential concept in understanding and analyzing electrical circuits and is a fundamental property of electricity.

Earth leakage circuit breakers offer ground fault protection and improved ground fault coordination capability. These breakers are designed to detect small leakage currents that occur when there is a fault in the electrical system, such as when a person accidentally touches a live wire. The breaker quickly detects the leakage current and trips to interrupt the circuit, preventing electric shock or fire hazards. Additionally, earth leakage circuit breakers have the ability to coordinate with other protective devices in the system, ensuring that the fault is isolated and cleared without affecting the rest of the circuit.

Direct current refers to an electric current that flows in one direction only and has a constant magnitude, or varies only slightly. Unlike alternating current, which periodically changes direction, direct current maintains a steady flow of electrons in a single direction. This type of current is commonly used in batteries, electronic devices, and certain power transmission systems.

The correct answer is Electrical Engineering. The phrase "SAFETY is its top PRIORITY" suggests that the subject being referred to is a field or discipline that places a high emphasis on safety. Among the given options, Electrical Engineering is a field that deals with the study and application of electricity, electronics, and electromagnetism, and safety is a crucial aspect of working with electrical systems. Therefore, Electrical Engineering aligns with the idea of safety being a top priority.

Alternating current is the correct answer because it refers to an electric current that changes direction periodically and has a magnitude that varies in a sinusoidal manner. This type of current is commonly used in electrical power transmission and is represented by a waveform that oscillates between positive and negative values. Volt ampere, direct current, and armature are not suitable answers as they do not accurately describe the given definition.

A circuit breaker is a switching device that is capable of making, carrying, and breaking currents under normal conditions. It can also make currents at specified times and break currents under specified abnormal circuit conditions, such as short circuits.

The correct answer is potential difference because it refers to the voltage difference between two points. Potential difference represents the work done in transferring a unit charge from one point to another. It is a measure of the electrical potential energy per unit charge.

Weatherproof means that something is constructed or protected in a way that it can withstand exposure to various weather conditions without being affected or damaged. It implies that the item will continue to function properly regardless of rain, wind, sun, or other weather elements. This term is commonly used for outdoor electronics, buildings, clothing, and other objects that need to withstand the elements.

A battery is a group of two or more cells connected together to produce electric current. Each cell within the battery contains an electrode and an electrolyte, which work together to generate and store electrical energy. The cells are connected in series or parallel to increase the overall voltage or capacity of the battery. Therefore, a battery is the correct answer as it accurately describes a group of cells connected together to produce electric current.

An outlet is a point on the wiring system where current is taken to supply utilization equipment. It is a device that provides a connection for electrical devices to be plugged in and receive power. Outlets are commonly found in homes and buildings and are used to power appliances, electronics, and other equipment.

An isolating (disconnecting) switch is a form of general-use switch that is used to disconnect an electric circuit from the source of power. It provides a means to isolate the circuit for maintenance or repair purposes, ensuring the safety of the personnel working on the circuit. This switch allows the circuit to be completely de-energized, preventing any electrical flow and eliminating the risk of electric shock. It is commonly used in residential, commercial, and industrial settings to safely isolate circuits and prevent accidents.

A Ground-Fault Circuit Interrupter (GFCI) is a device that is designed to protect personnel from electric shocks. It works by quickly de-energizing a circuit or a portion of it when a current to ground exceeds the values established for a Class A device. This means that if there is a ground fault, where electricity is flowing through an unintended path, the GFCI will detect the imbalance and shut off the power to prevent potential harm to people. Therefore, the GFCI is the correct answer in this case.

The term "UPS" stands for Uninterruptible Power Supply. This device is used to provide backup power to electronic devices in case of a power outage or voltage fluctuation. It ensures uninterrupted power supply by instantly switching to battery power when the main power source fails. This helps to prevent data loss, equipment damage, and downtime in critical systems.

Electric charge is a fundamental property of subatomic particles. It refers to the physical property of matter that causes it to experience a force when placed in an electromagnetic field. Electric charge can be positive or negative, and like charges repel while opposite charges attract. This property is essential in understanding the behavior of particles and their interactions in the field of physics.

A shielded cable is an electric cable that has a metallic sheath surrounding it. This metallic sheath acts as a barrier, reducing the effects of external electric or magnetic fields on the cable. It helps to protect the signals being transmitted through the cable from interference or noise caused by these external fields. This makes shielded cables ideal for applications where there is a need for reliable and high-quality signal transmission, such as in telecommunications or data transfer.

A receptacle is a contact device installed at the outlet for the connection of an attachment plug. It is a device that allows electrical equipment to be connected to a power supply. It typically consists of one or more sockets where plugs can be inserted. The receptacle provides a safe and convenient way to connect and disconnect electrical devices, allowing for easy access to power sources.

A raceway is an enclosed channel made of metal or nonmetallic materials that is specifically designed to hold wires, cables, or busbars. It is a component that is used in electrical installations to protect and organize the wiring system. The raceway provides a safe and secure pathway for the electrical conductors, preventing them from being damaged or exposed to external elements. It also allows for easy installation, maintenance, and modification of the electrical system. In addition to its primary function, a raceway may also have additional permitted functions as specified in the electrical code.

A conduit is a tube, pipe, or duct that is used to enclose and protect electric wires or cables. It provides a safe and organized pathway for the wires, preventing damage and ensuring efficient transmission of electricity. Conduits are commonly made of metal or plastic and can be rigid or flexible depending on the specific application. They are an essential component in electrical installations, allowing for the proper routing and protection of wires and cables.

Arc extinguishers are devices that are used to extinguish the arc that is formed between the opening contacts of a circuit breaker. When a circuit breaker is opened, an arc is created due to the interruption of the electrical current. This arc can be dangerous and can cause damage to the contacts and surrounding equipment. Arc extinguishers work by using various techniques such as cooling, magnetic blowout, or deionization to quickly extinguish the arc and prevent any further damage.

A volt ampere is a unit of electric measurement that represents the product of one volt and one ampere. In a direct current system, it is equivalent to one watt, which is a unit of power. In alternating current systems, a volt ampere is a unit of apparent power.

The unit watt (W) is commonly used to measure electrical power. Power refers to the rate at which electrical energy is converted or transferred. It quantifies the amount of work done or energy consumed per unit time. In the context of electrical engineering, power is a crucial concept as it helps in understanding the efficiency and capacity of electrical systems and devices. Therefore, the answer "Electrical Power" is appropriate as it directly relates to the given unit of measurement.

Thermal-magnetic breakers are able to provide protection against both thermal and magnetic overloads. The explanation states that these breakers use a bimetal heated by the load current. Bimetals are responsive to the heat emitted by the current flow, allowing for a long time delay on light overloads. However, they also have a fast response on heavier overloads. This means that thermal-magnetic breakers can effectively protect against a wide range of overloads, making them a suitable choice for various applications.

A transfer switch is used to transfer the load or source of power from one point to another. It is commonly used in connection with standby or emergency power supplies. This switch allows for a smooth transition between the main power source and the backup power source, ensuring uninterrupted power supply during power outages or maintenance work.

A cable tray is a type of open metal framework that is used to support and organize insulated electrical conductors. It provides a safe and efficient way to route and protect cables in various settings, such as industrial buildings or data centers. The open design of the cable tray allows for easy installation and maintenance of the cables, as well as proper ventilation to prevent overheating. Overall, a cable tray is an essential component in electrical systems to ensure the proper functioning and organization of cables.

An appliance refers to equipment that is typically used in households or non-industrial settings and is available in standardized sizes or types. These appliances are installed or connected as a unit to perform various functions such as washing clothes, air conditioning, food mixing, deep frying, and more.

A fitting is a type of accessory that is used in a wiring system primarily for mechanical purposes rather than electrical functions. It could refer to a locknut, bushing, or any other part that helps in the installation or connection of electrical components. Unlike equipment or appliances, which are more focused on electrical operations, fittings are specifically designed to provide mechanical support or facilitate the proper installation of wiring systems. An outlet, on the other hand, refers to a device through which electrical power is supplied to connected devices, making it less likely to be the correct answer in this case.

The SI unit of electric charge is the coulomb. It is defined as the quantity of electricity transferred along a conductor when a current of one ampere flows through it for one second. The coulomb is a fundamental unit in electromagnetism and is used to measure the amount of electric charge in a system. It is named after the French physicist Charles-Augustin de Coulomb, who made significant contributions to the study of electromagnetism.

A knockout refers to a panel in a casing or box that can be easily removed, typically by punching, hammering, or cutting, in order to create an opening into the interior. This allows for easy access to the inside of the casing or box for various purposes such as installing or repairing electrical components or routing cables.

Electronic rms Trip Breakers are able to achieve tripping in the presence of overload or short circuit conditions by using current transformers and solid-state circuitry. The current transformers monitor the current flowing through the circuit, while the solid-state circuitry detects any abnormalities such as an overload or short circuit. When such a condition is detected, the circuitry initiates tripping through a flux shunt trip mechanism. This mechanism ensures that the breaker trips and interrupts the flow of current in order to protect the circuit and prevent any potential damage or hazards.

A transformer is a device that transfers electric energy from one circuit to another. It is commonly used in electric power distribution to either increase (step-up) or decrease (step-down) the voltage. Additionally, transformers are used to isolate one electric circuit from another.

Voltage refers to the potential difference between two points in a circuit. It is a measure of the electric potential energy per unit charge. Voltage is responsible for driving the flow of electric current through a circuit. It is often described as the "push" or "force" that causes electrons to move from one point to another. Without voltage, there would be no flow of electricity in a circuit.

Electrical power refers to the rate at which work is done or energy is transferred in an electrical circuit. It is calculated by multiplying the voltage and current in the circuit. This means that the more voltage and current present in a circuit, the higher the electrical power. Therefore, electrical power is the correct answer as it aligns with the given definition.

A fuse is an overcurrent protective device that contains a circuit-opening fusible member. When an overcurrent passes through the fuse, the fusible member heats up and ultimately gets severed, opening the circuit and protecting the electrical system from damage. Fuses are commonly used in electrical systems to prevent excessive current flow and safeguard against short circuits or overloads.

A current-limiting overcurrent protective device is a device that can interrupt currents within its current-limiting range. When a fault occurs in the circuit, this device reduces the current flowing through the faulted circuit to a much lower magnitude than what would flow if a solid conductor or a device with comparable impedance were used instead. This helps to protect the circuit and prevent damage from excessive current.

Flexible metal conduit, also known as Greenfield conduit, is a type of helically wound metal conduit that is used for connections to motors or other vibrating equipment. It provides flexibility and protection for electrical wiring in areas where there may be movement or vibrations. This conduit is often used in industrial settings or in areas where there is a need for a more flexible wiring solution. It is different from other types of conduits such as electrical metal tubing (EMT) or rigid metal conduit, which have their own distinct characteristics and uses.

A grommet is a rubber or plastic washer that is inserted in a hole in a metal part to prevent grounding of a wire passing through the hole. It acts as an insulator and protects the wire from coming into contact with the metal, preventing any electrical short circuits or grounding issues. Grommets are commonly used in electrical installations to ensure the safety and proper functioning of the wiring system.

Wattage is the correct answer because it refers to the amount of power required to operate an electrical device or appliance. It is a unit of measurement for power, specifically the rate at which energy is consumed or produced. Wattage is commonly used to determine the power capacity of electrical devices and is essential for understanding the amount of power needed for efficient operation.

A substation is an auxiliary power station where electrical current is converted, such as from DC to AC or where voltage is stepped up or down. It is a crucial part of the electrical power system as it helps in the distribution and transmission of electricity. Substations are responsible for maintaining the reliability and stability of the power supply by regulating voltage levels and protecting the system from faults and overloads. They also play a vital role in connecting different power sources, such as generators or renewable energy systems, to the grid.

A service entrance conductor refers to the portion of a service conductor that extends from a service drop or service lateral to the service equipment of a building. This conductor is responsible for carrying electrical power from the utility company's service point to the building's service equipment, such as the main breaker panel. It is an essential component in the electrical distribution system of a building, ensuring that electricity is safely and efficiently delivered to the premises.

When an object is "electrically connected to a source of voltage," it means that it is receiving electrical energy from that source. This energizes the object, meaning it has electric power flowing through it. Therefore, the correct answer is "Energized."

Breakdown voltage refers to the minimum applied voltage at which an insulator breaks down and allows current to flow. It is the point where the insulating material can no longer prevent the passage of electricity and starts conducting. This phenomenon is known as dielectric breakdown. The breakdown voltage is a crucial parameter in determining the maximum voltage that can be applied to an insulator before it fails and becomes conductive.

Bonded refers to the permanent joining of metallic parts to form an electrically conductive path. This ensures electrical continuity and the ability to safely conduct any current that may be imposed. Bonding is important in electrical systems to prevent the buildup of static electricity, reduce the risk of electric shock, and provide a safe path for electrical faults to dissipate.

A remote control circuit is an electric circuit that controls another circuit through a relay or an equivalent device. This type of circuit allows the user to operate a device or system from a distance, without direct physical contact. It typically involves the use of a transmitter and a receiver, where the transmitter sends signals to the receiver to activate or deactivate the controlled circuit. This technology is commonly used in various applications such as television remote controls, garage door openers, and remote-controlled toys.

A distribution panel is another name for a power panel. It is an electrical component that receives power from a main power source and distributes it to various circuits and devices within a building or facility. The distribution panel typically contains circuit breakers or fuses to protect the circuits from overloading and short circuits. It is commonly used in residential, commercial, and industrial settings to control and distribute electrical power efficiently and safely.

The negative terminal of a primary cell or storage battery is called the anode. The anode is the electrode where oxidation occurs during the discharge of a cell or battery. It is the site where electrons are produced and flow out of the cell or battery. In contrast, the positive terminal is called the cathode, where reduction occurs. The anode and cathode work together to create an electrical current in a cell or battery.

"Exposed" refers to live parts that are not adequately guarded, isolated, or insulated, making them capable of being inadvertently touched or approached by a person within an unsafe distance. This means that there is a risk of electric shock or injury if someone comes into contact with these exposed live parts.

An electrode is a conductor through which a current enters or leaves a non-metallic medium. It is used to make electrical contact with a non-metallic material or solution, allowing the flow of current. In this context, an electrode is the most appropriate choice as it fits the given description accurately. An electrolyte refers to a substance that conducts electricity when dissolved in a solvent, while anode and cathode are specific types of electrodes used in electrochemical reactions.