Electrician Workbook Basic Electrical
Questions and Answers
- 1.
The SI unit of electric charge equal to the quantity of electricity transferred along the conductor by a current of one ampere in one second.
- A.
KILOWATT (kW)
- B.
COULUMB (C)
- C.
WATTAGE
- D.
POTENTIAL DIFFERENCE
Correct Answer
B. COULUMB (C)Explanation
The correct answer is COULOMB (C). The explanation is that the coulomb is the SI unit of electric charge. It represents the quantity of electricity transferred along a conductor by a current of one ampere in one second. This unit is used to measure the amount of charge in an electrical system or the flow of charge in an electric circuit.Rate this question:
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- 2.
The energy per unit charge available for conversion from a chemical, mechanical or other form of energy into electrical energy or vice versa in a conversion devise as a battery, generator or a motor
- A.
ELECTROMOTIVE FORCE (emf)
- B.
VOLTAGE
- C.
AMPERE (A)
- D.
OHM
Correct Answer
A. ELECTROMOTIVE FORCE (emf)Explanation
The correct answer 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. It is commonly associated with batteries, generators, and motors, where chemical, mechanical, or other forms of energy are converted into electrical energy. It is measured in volts (V) and represents the potential difference or voltage across a circuit.Rate this question:
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- 3.
The basic SI unit of electric current, 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.
AMPERAGE
- B.
CIRCUIT
- C.
AMPERE (A)
- D.
PARALLEL
Correct Answer
C. AMPERE (A)Explanation
The basic SI unit of electric current is the ampere (A). It is equivalent to a flow of one coulomb per second or to the steady current produced by one volt applied to one ohm of resistance. Ampere is commonly used to measure the amount of electric current flowing through a circuit.Rate this question:
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- 4.
The SI unit equal to one joule per second or to the power represented by a current of one ampere flowing across a potential difference of one volt W= V x A
- A.
WATT (W)
- B.
ELECTROMOTIVE FORCE (emf)
- C.
POTENTIAL DIFFERENCE
- D.
RESISTANCE (R)
Correct Answer
A. WATT (W)Explanation
The correct answer is "WATT (W)". The question is asking for the SI unit that is equal to one joule per second or to the power represented by a current of one ampere flowing across a potential difference of one volt. The unit for power is the watt, which is equal to one joule per second.Rate this question:
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- 5.
The strength of an electric current measured or expressed in amperes: analogous to the rate of water flow
- A.
AMPERAGE
- B.
RESISTANCE (R)
- C.
BATTERY
- D.
ELECTRODE
Correct Answer
A. AMPERAGEExplanation
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, meaning that just as water flow can be measured in terms of how much water passes through a point in a given time, amperage measures the amount of electric charge that passes through a point in a circuit per unit of time. In other words, amperage quantifies the flow of electric charge in a circuit, similar to how water flow quantifies the movement of water.Rate this question:
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- 6.
A pliable metallic strand or twisted or woven assembly of such strands often insulated with a dielectric material and used as a conductor of electricity
- A.
INSULATOR
- B.
WIRE
- C.
NON- METALLIC SHEATED CABLE
- D.
SHIELDED CABLE
Correct Answer
B. WIREExplanation
The correct answer is "WIRE" because it is a pliable metallic strand or twisted or woven assembly of such strands. It is often insulated with a dielectric material and used as a conductor of electricity.Rate this question:
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- 7.
An electric cable enclosed within a metallic sheath in order to reduce the effects of external electric or magnetic fields
- A.
COAXIAL CABLE
- B.
FLEXIBLE METAL CONDUIT
- C.
RIGID METAL CONDUIT
- D.
SHIELDED CABLE
Correct Answer
D. SHIELDED CABLEExplanation
A shielded cable is an electric cable that is enclosed within a metallic sheath. This metallic sheath acts as a shield and helps to reduce the effects of external electric or magnetic fields. By providing this shielding, the cable is protected from interference and can transmit signals more effectively without any distortion or loss of quality. Shielded cables are commonly used in applications where there is a need to minimize the impact of external electromagnetic interference, such as in audio or video transmission, computer networking, or industrial automation.Rate this question:
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- 8.
The minimum applied voltage at which a given insulator breaks down and permits current to pass
- A.
BREAKDOWN VOLTAGE
- B.
DIELECTRIC
- C.
JUNCTION BOX
- D.
GROMMET
Correct Answer
A. BREAKDOWN VOLTAGEExplanation
The breakdown voltage refers to the minimum applied voltage that causes an insulator to break down and allows current to pass through it. This phenomenon is commonly observed in dielectric materials, which are used to insulate electrical components. When the applied voltage exceeds the breakdown voltage, the insulator's resistance decreases, leading to the flow of current. Junction box and grommet are unrelated terms and do not describe the given concept.Rate this question:
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- 9.
An enclosure for housing and protecting electric wires or cables that are joined together in connecting or branching electric circuits
- A.
PULL BOX
- B.
THWN
- C.
INSULATOR
- D.
JUNCTION BOX
Correct Answer
D. JUNCTION BOXExplanation
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 electrical connections, preventing damage and ensuring proper insulation. The use of a junction box helps to maintain the integrity and functionality of the electrical system by keeping the wires secure and protected from external elements.Rate this question:
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- 10.
An amount of power especially the power required to operate an electrical device or appliance, expressed in watts
- A.
WATTAGE
- B.
KILOWATT (kW)
- C.
COULUMB (C)
- D.
WATT (W)
Correct Answer
A. WATTAGEExplanation
The correct answer is WATTAGE. Wattage refers to the amount of power, specifically the power needed to operate an electrical device or appliance, and is typically measured in watts.Rate this question:
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- 11.
A unit of power equal to 1,000 watts
- A.
KILOWATT-HOUR (kWh)
- B.
POTENTIAL DIFFERENCE
- C.
VOLTAGE
- D.
KILOWATT (kW)
Correct Answer
D. KILOWATT (kW)Explanation
A kilowatt (kW) is a unit of power equal to 1,000 watts. It is commonly used to measure the rate at which electrical energy is consumed or produced.Rate this question:
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- 12.
Potential difference or electromotive force expressed in volts: analogous to pressure in water flow
- A.
VOLT (V)
- B.
CURRENT
- C.
VOLTAGE
- D.
AMPERE (A)
Correct Answer
C. VOLTAGEExplanation
The potential difference or electromotive force is expressed in volts. This is analogous to the pressure in water flow. Just like pressure is the driving force for water to flow, voltage is the driving force for electric current to flow. It represents the difference in electric potential between two points in a circuit and determines the flow of electrons.Rate this question:
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- 13.
The opposition of a conductor to the flow of current, causing some of the electric energy to be transformed into heat and usually measured in ohms
- A.
AMPERE (A)
- B.
AMPERAGE
- C.
OHM
- D.
RESISTANCE (R)
Correct Answer
D. RESISTANCE (R)Explanation
Resistance is the correct answer because it refers to the opposition of a conductor to the flow of current. When there is resistance in a circuit, some of the electric energy is transformed into heat. Resistance is usually measured in ohms. Ampere (A) and amperage refer to the unit of electric current, while ohm is the unit of resistance. Therefore, resistance is the most appropriate term to describe the given explanation.Rate this question:
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- 14.
The principle 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
- A.
CIRCUIT
- B.
CONDUCTIVITY
- C.
RESISTIVITY
- D.
JOULE’S LAW
Correct Answer
D. JOULE’S LAWExplanation
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. Similarly, as the current in the circuit increases, the rate of heat production increases even more. This principle is important in understanding how electrical energy is converted into heat energy in various electrical devices and circuits.Rate this question:
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- 15.
A measure of the ability of a substance to conduct electric current, equal to the reciprocal of the resistivity of the substance. Also called specific conductance.
- A.
CONDUCTIVITY
- B.
SERIES
- C.
PARALLEL
- D.
BATTERY
Correct Answer
A. CONDUCTIVITYExplanation
Conductivity is a measure of how well a substance can conduct electric current. It is equal to the reciprocal of the resistivity of the substance. In other words, the higher the conductivity, the better the substance can conduct electricity. It is also known as specific conductance.Rate this question:
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- 16.
RHW
- A.
Moisture resistant thermoplastic
- B.
Moisture and heat resistance rubber
- C.
Asbestos and varnished cambric
- D.
Silicone asbestos
Correct Answer
B. Moisture and heat resistance rubberExplanation
The correct answer is "Moisture and heat resistance rubber". This suggests that the material being referred to has properties that make it resistant to both moisture and heat. It is likely that this type of rubber can withstand exposure to high temperatures without degrading or losing its structural integrity, while also being resistant to the damaging effects of moisture or water.Rate this question:
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- 17.
XHHW
- A.
Silicone asbestos
- B.
Heat resistant thermoplastic
- C.
Moisture & heat resistant thermoplastic
- D.
Moisture & heat resistant cross linked
Correct Answer
D. Moisture & heat resistant cross linkedExplanation
The correct answer is "Moisture & heat resistant cross linked". Cross linked refers to the process of chemically bonding the polymer chains together, making the material more durable and resistant to heat and moisture. This type of material is commonly used in applications where high temperatures and exposure to moisture are expected, such as electrical wiring and insulation.Rate this question:
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- 18.
THW
- A.
Moisture & heat resistant thermoplastic
- B.
Moisture resistant thermoplastic
- C.
Moisture and heat resistance rubber
- D.
Asbestos and varnished cambric
Correct Answer
A. Moisture & heat resistant thermoplasticExplanation
The correct answer is "Moisture & heat resistant thermoplastic" because it is the only option that specifically mentions both moisture and heat resistance. The other options either only mention moisture resistance or do not mention resistance to either moisture or heat. Therefore, the moisture & heat resistant thermoplastic is the most suitable material for applications where both moisture and heat resistance are required.Rate this question:
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- 19.
Used as supports and for additional protection for wires
- A.
CUT OUT BOX
- B.
INSULATOR
- C.
OUTLET BOX
- D.
BUSHING
Correct Answer
B. INSULATORExplanation
Insulators are commonly used as supports and for additional protection for wires. They are materials that do not conduct electricity, and therefore prevent the flow of electrical current. In the context of the given options, an insulator would be the most suitable choice for providing support and protection for wires, as it would prevent any potential electrical hazards. The other options, such as cut out box, outlet box, and bushing, do not specifically serve the purpose of insulation and may not provide the same level of protection for the wires.Rate this question:
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- 20.
Where cable ends
- A.
UTILITY BOX
- B.
PULL BOX
- C.
CUT OUT BOX
- D.
OUTLET BOX
Correct Answer
D. OUTLET BOXExplanation
An outlet box is the correct answer because it is specifically designed to house electrical outlets and provide a safe and secure connection point for electrical cables. It is commonly used in residential and commercial buildings to contain and protect electrical wiring connections. The other options mentioned (utility box, pull box, and cut out box) may have different purposes or functions, but they are not specifically designed for housing electrical outlets.Rate this question:
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- 21.
Metal box with hinge & enclosure. House or fuse box
- A.
CUT OUT BOX
- B.
OUTLET BOX
- C.
PULL BOX
- D.
UTILITY BOX
Correct Answer
A. CUT OUT BOXExplanation
A cut out box is a type of metal box with a hinge and enclosure that is commonly used to house electrical components such as fuses or circuit breakers. It is often installed on the exterior of a building and provides a secure and protected space for these components. The other options mentioned, such as outlet box, pull box, and utility box, are also types of metal boxes used in electrical installations, but they do not typically have a hinge and enclosure like a cut out box does. Therefore, the correct answer is cut out box.Rate this question:
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- 22.
A rubber or plastic washer inserted in a hole in a metal part to prevent grounding of a wire passing through the hole
- A.
KNOCKOUT
- B.
GROMMET
- C.
JUNCTION BOX
- D.
BUSHING
Correct Answer
B. GROMMETExplanation
A grommet is a rubber or plastic washer that is inserted in a hole in a metal part. It is used to prevent grounding of a wire passing through the hole. The grommet acts as insulation, protecting the wire from coming into contact with the metal and causing a short circuit or electrical shock.Rate this question:
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- 23.
The maximum voltage that can be applied to a given material without causing it to breakdown, usually expressed in volts or kilovolts per unit of thickness
- A.
DIELECTRIC STRENGTH
- B.
DIELECTRIC
- C.
BREAKDOWN VOLTAGE
- D.
CABLE TRAY
Correct Answer
A. DIELECTRIC STRENGTHExplanation
Dielectric strength refers to the maximum voltage that can be applied to a given material without causing it to breakdown. It is usually expressed in volts or kilovolts per unit of thickness. This property is important in electrical insulation as it determines the ability of a material to withstand high voltages without experiencing electrical breakdown.Rate this question:
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- 24.
An open metal framework for supporting insulated electrical conductors
- A.
BUS DUCT
- B.
DUCT
- C.
MULTI- OUTLET ASSEMBLY
- D.
CABLE TRAY
Correct Answer
D. CABLE TRAYExplanation
A cable tray is an open metal framework that is used to support and organize insulated electrical conductors. It provides a safe and efficient way to route and manage cables in various settings, such as industrial buildings, data centers, and commercial facilities. Cable trays are designed to prevent cable damage and ensure proper ventilation for the cables, reducing the risk of overheating. They are a cost-effective solution for cable management and are easily adjustable and expandable to accommodate future cable additions or modifications.Rate this question:
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- 25.
A surface mounted raceway designed to house the electrical wires for a circuit and a series of receptacles
- A.
MULTI- OUTLET ASSEMBLY
- B.
SURFACE RACEWAY
- C.
RACEWAY
- D.
FLEXIBLE METAL CONDUIT
Correct Answer
A. MULTI- OUTLET ASSEMBLYExplanation
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 is a convenient and organized solution for providing power to multiple devices in a specific area. The multi-outlet assembly allows for easy installation and maintenance of the electrical wiring, while also providing a safe and secure housing for the wires and receptacles.Rate this question:
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- 26.
Thin- walled, tubular steel conduit joined by compression or setscrew couplings
- A.
CONDUIT
- B.
RIGID METAL CONDUIT
- C.
ELECTRICAL METAL TUBING (EMT)
- D.
RACEWAY
Correct Answer
C. ELECTRICAL METAL TUBING (EMT)Explanation
The correct answer is ELECTRICAL METAL TUBING (EMT). EMT is a type of conduit that is made of thin-walled, tubular steel. It is joined together using compression or setscrew couplings. EMT is commonly used in electrical installations to protect and route electrical wiring. It is a flexible and lightweight option compared to rigid metal conduit, making it easier to install.Rate this question:
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- 27.
Flexible, helically wound metal conduit, used for connections to motors or other vibrating equipment. Also called Greenfield conduit
- A.
FLEXIBLE METAL CONDUIT
- B.
RACEWAY
- C.
MULTI- OUTLET ASSEMBLY
- D.
RIGID METAL CONDUIT
Correct Answer
A. FLEXIBLE METAL CONDUITExplanation
Flexible metal conduit is a type of conduit that is helically wound and made of metal. It is used for making connections to motors or other vibrating equipment. It is also commonly known as Greenfield conduit. This type of conduit is flexible, allowing it to easily bend and maneuver around obstacles. It provides protection for the electrical wiring inside and is suitable for applications where vibration or movement is a concern. Rigid metal conduit, on the other hand, is a more rigid and less flexible type of conduit. Therefore, the correct answer is flexible metal conduit.Rate this question:
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- 28.
A cable for transmitting high frequency telephone, digital or television signals consisting of an insulated conducting core
- A.
COAXIAL CABLE
- B.
NON- METALLIC SHEATED CABLE
- C.
SHIELDED CABLE
- D.
NON- METALLIC SHEATED CABLE
Correct Answer
A. COAXIAL CABLEExplanation
A coaxial cable is a type of cable that is used to transmit high-frequency signals, such as those used in telephone, digital, or television applications. It consists of an insulated conducting core, which is surrounded by a metallic shield and then covered with a protective outer layer. The metallic shield helps to minimize interference and signal loss, making it ideal for transmitting high-frequency signals over long distances. Therefore, the correct answer is COAXIAL CABLE.Rate this question:
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- 29.
Electric cable consisting of a tubular copper sheath containing one or more conductors embedded in a highly compressed, insulating refractory mineral
- A.
NON- METALLIC SHEATED CABLE
- B.
MINERAL ISULATED CABLE
- C.
ARMORED CABLE
- D.
COAXIAL CABLE
Correct Answer
B. MINERAL ISULATED CABLEExplanation
The correct answer is MINERAL ISULATED CABLE because it accurately describes an electric cable consisting 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 ability to withstand extreme conditions.Rate this question:
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- 30.
Electric cable consisting of two or more insulated conductors protected by flexible, helically wound metal wrapping. Also called BX
- A.
CABLE
- B.
ARMORED CABLE
- C.
NON- METALLIC SHEATED CABLE
- D.
COAXIAL CABLE
Correct Answer
B. ARMORED CABLEExplanation
An armored cable is an electric cable that has two or more insulated conductors protected by a flexible, helically wound metal wrapping. This metal wrapping provides extra protection to the conductors, making the cable more resistant to physical damage and external elements. It is commonly used in applications where the cable needs to be installed in areas with a higher risk of damage, such as underground or in industrial environments. The term "BX" is another name for armored cable.Rate this question:
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Mar 21, 2023Quiz Edited by
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Apr 24, 2012Quiz Created by
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