#1
Which of the following materials is commonly used as insulation in electrical wiring?
Rubber
ExplanationRubber is commonly used due to its insulating properties.
#2
What is the purpose of a ground wire in an electrical circuit?
To provide a return path for fault current
ExplanationGround wire acts as a return path for fault current, ensuring safety.
#3
What is the maximum voltage typically carried by a standard household electrical outlet?
120 volts
ExplanationStandard household outlets typically carry 120 volts.
#4
Which type of electrical wire is typically used for long-distance transmission of power?
Aluminum wire
ExplanationAluminum wire is commonly used for long-distance transmission.
#5
What is the function of an insulator in electrical wiring?
To provide a barrier against the flow of electricity
ExplanationInsulators block the flow of electricity, preventing unwanted conduction.
#6
What is the standard color coding for a neutral wire in electrical wiring?
White
ExplanationWhite is the standard color for neutral wires.
#7
Which type of cable consists of multiple conductors twisted together?
Twisted pair cable
ExplanationTwisted pair cable has multiple conductors twisted to reduce interference.
#8
What is the purpose of a circuit breaker in an electrical system?
To interrupt power flow in case of overload or short circuit
ExplanationCircuit breakers halt power flow during overloads or short circuits.
#9
What is the difference between a series circuit and a parallel circuit?
In a series circuit, components are connected in a single loop, while in a parallel circuit, components are connected in multiple loops.
ExplanationSeries circuits have components in a single loop, while parallel circuits have multiple loops.
#10
What is the main function of a junction box in electrical installations?
To protect electrical connections and contain sparks
ExplanationJunction boxes safeguard connections and prevent sparks.
#11
What is the purpose of a conduit in electrical wiring installations?
To protect wires from physical damage
ExplanationConduit shields wires from physical harm.
#12
What is the purpose of an earth (ground) wire in a three-pin electrical plug?
To provide a path for the flow of excessive current in case of a fault
ExplanationGround wire allows excessive current flow in case of faults, ensuring safety.
#13
In electrical wiring, what does AWG stand for?
American Wiring Gauge
ExplanationAWG stands for American Wiring Gauge.
#14
What is the purpose of a conduit fitting in electrical installations?
To connect two conduits together
ExplanationConduit fittings join two conduits in electrical installations.
#15
What is the primary function of a cable tray in electrical installations?
To provide support and containment for cables
ExplanationCable trays offer support and contain cables in installations.