Electrical Definition Exam Quiz

A coaxial cable is a type of cable that is used to transmit high frequency signals such as telephone, digital, or television signals. It consists of an insulated conducting core, which is surrounded by a metallic shield and then covered with an outer insulating layer. The metallic shield helps to prevent interference and signal loss, making it ideal for transmitting high frequency signals. Therefore, the correct answer is coaxial cable.

Conductivity refers to the ability of a substance to conduct electric current. It is directly related to the reciprocal of the resistivity of the substance. In other words, the higher the conductivity, the better the substance is at conducting electricity. Conductivity is also known as specific conductance.

A junction box is an enclosure used to house and protect electric wires or cables that are joined together in connecting or branching electric circuits. It provides a safe and organized space for the wires to be connected, preventing them from being exposed and reducing the risk of electrical hazards.

Resistance is the correct answer because it refers to the opposition of a conductor to the flow of current. It is a property that causes some of the electric energy to be transformed into heat. Resistance is usually measured in ohms, which is mentioned in the question. The other options, Ampere, Ampereage, and Ohm, do not accurately describe the concept of opposition to current flow and the transformation of energy into heat.

The given correct answer for this question is "ELECTROMOTIVE FORCE (emf)". Electromotive force refers to the energy per unit charge available for conversion from one form of energy to electrical energy or vice versa in a conversion device such as a battery, generator, or motor. It is the driving force behind the flow of electric current in a circuit.

A kilowatt is a unit of power that is equal to 1,000 watts. Power is the rate at which energy is transferred or converted, and the watt is the standard unit for measuring power. Therefore, a kilowatt is a larger unit of power than a watt, with 1 kilowatt being equal to 1,000 watts.

Flexible metal conduit, also known as Greenfield conduit, is a 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 vibration or movement is present. This type of conduit is commonly used in industrial settings or in areas where there is a need for a more flexible wiring solution. It is different from rigid metal conduit, which is a more rigid and inflexible option for wiring installations.

Amperage refers to the strength of an electric current, which is measured or expressed in amperes. It is analogous to the rate of water flow, indicating the amount of electric charge passing through a given point in a circuit per unit of time. Just like water flow, amperage can vary depending on the resistance in the circuit. A higher resistance will result in a lower amperage, while a lower resistance will allow for a higher amperage. The amperage is an important factor in determining the power and efficiency of an electrical system.

Breakdown voltage refers to the minimum voltage required for an insulator to break down and allow current to pass through. This phenomenon occurs when the electric field within the insulator becomes strong enough to cause the insulating material to lose its resistance and become conductive. The breakdown voltage is an important parameter in determining the maximum voltage that an insulator can withstand before it fails and allows current leakage.

The correct answer is WATT (W) because the question describes the SI unit equal to one joule per second or the power represented by a current of one ampere flowing across a potential difference of one volt. The watt is the unit used to measure power and is calculated by multiplying voltage (V) by current (A).

The correct answer is "Moisture and heat resistance rubber." This type of rubber is designed to withstand both moisture and high temperatures, making it suitable for applications where these properties are important. It is likely used in environments where there is a combination of moisture and heat, such as in industrial settings or outdoor applications.

An armored cable is an electric cable that is protected by a flexible, helically wound metal wrapping. This metal wrapping provides additional protection and durability to the cable, making it suitable for use in harsh environments or areas where the cable may be exposed to physical damage. It is also commonly referred to as BX cable.

Insulators are materials that do not conduct electricity and are used to prevent the flow of electrical current. In the context of the question, insulators are used as supports and for additional protection for wires. They help to prevent the wires from coming into contact with other conductive materials, reducing the risk of electrical shocks or short circuits. Insulators are commonly used in electrical installations to ensure the safety and proper functioning of the wiring system.

The correct answer is "Moisture & heat resistant thermoplastic." This answer is supported by the information provided in the question, which states that the material is both moisture and heat resistant. The other options mentioned in the question, such as moisture resistant thermoplastic, moisture and heat resistance rubber, and asbestos and varnished cambric, do not fully meet the criteria of being both moisture and heat resistant. Therefore, the correct answer is the one that satisfies both requirements.

The SI unit of electric charge is the coulomb (C). It is defined as the quantity of electricity transferred along a conductor by a current of one ampere in one second. The coulomb is used to measure the amount of electric charge in a system. The other options, kilowatt (kW), wattage, and potential difference, are not units of electric charge, but rather units of power and electrical potential.

The correct answer is AMPERE (A). An ampere is defined as the basic SI unit of electric current. It is equivalent to a flow of one coulomb per second or to the steady current produced by one volt applied to one resistance of one ohm.

A cable tray is an open metal framework that is used to support insulated electrical conductors. It provides a safe and organized way to route and manage cables in buildings or industrial settings. The open design allows for easy installation and maintenance of the cables, while the metal construction provides durability and protection. Cable trays are commonly used in areas where there is a high volume of cables, such as data centers, power plants, and commercial buildings. They are an essential component of electrical systems, ensuring the safe and efficient distribution of power.

A grommet is a rubber or plastic washer that is inserted into a hole in a metal part. It is used to prevent grounding of a wire that passes through the hole. By providing insulation and protection to the wire, the grommet ensures that the wire does not come into contact with the metal part and cause a short circuit or electrical damage.

The correct answer is "WIRE" because a wire is a pliable metallic strand or twisted or woven assembly of such strands that is often insulated with a dielectric material and used as a conductor of electricity.

The term "wattage" refers to the amount of power needed to operate an electrical device or appliance, measured in watts. It is the correct answer because it directly relates to the definition provided in the question. The other options, kilowatt (kW), coulomb (C), and watt (W), are related to power measurement but do not specifically refer to the power required to operate a device or appliance.

The correct answer is OUTLET BOX because an outlet box is typically used to house electrical outlets or switches. It is installed in walls or ceilings and provides a secure and enclosed space for electrical connections. The other options, such as utility box, pull box, and cut out box, are not specifically designed for housing outlets and are used for different purposes in electrical installations.

The correct answer is ELECTRICAL METAL TUBING (EMT). EMT is a type of conduit used in electrical installations. It is made of thin-walled, tubular steel and is joined together using compression or setscrew couplings. EMT provides a protective pathway for electrical wires and is commonly used in residential and commercial buildings. Rigid metal conduit and raceway are also types of conduits, but they have different characteristics and joining methods compared to EMT.

A shielded cable is an electric cable that is enclosed within a metallic sheath. This metallic sheath is used to reduce the effects of external electric or magnetic fields. By enclosing the cable in a metallic sheath, the shielded cable provides protection against interference from external sources, ensuring that the signal transmitted through the cable remains clear and unaffected. This makes shielded cables ideal for applications where there is a high likelihood of encountering external electric or magnetic fields that could disrupt the signal transmission.

Joule's Law states that the rate of production of heat by direct current is directly proportional to the resistance of the circuit and to the square of the current. This means that as the resistance of the circuit increases, the rate of heat production also increases. Additionally, as the current flowing through the circuit increases, the rate of heat production increases exponentially. This law helps to explain the relationship between electrical energy and heat production in a circuit.

The correct answer is "Moisture & heat resistant cross linked." Cross linking refers to the process of chemically bonding polymer chains together, resulting in a more stable and durable material. In this context, the cross linked XHHW is designed to withstand both moisture and heat, making it suitable for applications where these factors are present. The other options, such as silicone asbestos and heat resistant thermoplastic, do not mention cross linking and may not provide the same level of resistance.

The correct answer is MINERAL ISULATED CABLE because it describes an electric cable that consists of a tubular copper sheath containing one or more conductors embedded in a highly compressed, insulating refractory mineral. This type of cable is commonly used in high-temperature and fire-resistant applications due to its mineral insulation.

Voltage is the potential difference or electromotive force expressed in volts. It is analogous to pressure in water flow. Just like pressure determines the flow of water, voltage determines the flow of electric current. It represents the energy per unit charge and is measured in volts.

The term "dielectric strength" refers to the maximum voltage that a material can withstand without undergoing breakdown. It is typically expressed in volts or kilovolts per unit of thickness. This property is important in various applications, such as insulation materials in electrical systems. Dielectric strength determines the ability of a material to resist electrical breakdown and maintain its insulating properties.

A multi-outlet assembly is a surface mounted raceway designed to house the electrical wires for a circuit and a series of receptacles. This means that it provides a convenient and organized way to distribute power to multiple outlets in a room or area. It eliminates the need for individual wiring for each outlet, making installation easier and more efficient. The multi-outlet assembly typically includes a raceway, which is a channel or conduit that holds the wires, and flexible metal conduit may also be used for added protection.

A cut out box is a metal box with a hinge and enclosure that is commonly used for housing electrical components such as fuses. It is often installed in residential or commercial buildings to provide a secure and organized space for electrical connections. The other options listed, such as outlet box, pull box, and utility box, do not specifically refer to a box with a hinge and enclosure, making them incorrect choices for this question.