#1
What is the primary purpose of the grounding in an electrical system?
To provide a path for electric current to prevent electric shock
ExplanationGrounding ensures a safe path for current, preventing electric shock.
#2
Which device is used to protect a circuit from short-circuit and overloading?
Circuit breaker
ExplanationCircuit breakers safeguard circuits by interrupting the flow during faults or overloads.
#3
Which type of cable is typically used for indoor electrical wiring?
Non-metallic sheathed cable
ExplanationNon-metallic sheathed cable is commonly used for indoor electrical wiring.
#4
What is the purpose of a GFCI (Ground Fault Circuit Interrupter)?
To protect against electrical shock from ground faults
ExplanationGFCI protects against electric shock by interrupting the circuit during ground faults.
#5
What is the maximum current for a typical 20-ampere circuit breaker?
20 A
ExplanationA typical 20-ampere circuit breaker has a maximum current of 20A.
#6
What does the term 'AWG' stand for in electrical wiring?
American Wire Gauge
ExplanationAWG denotes the American Wire Gauge standard for wire diameter.
#7
In a residential wiring system, what color is typically used to denote the live wire?
Red
ExplanationThe live wire in residential wiring is commonly marked with the color red.
#8
What does the term 'conduit' refer to in electrical installations?
A protective tube or trough for wires
ExplanationConduit in electrical installations is a protective tube or trough for wires.
#9
What is the voltage of a standard residential electrical outlet in the United States?
110 V
ExplanationStandard residential outlets in the US typically have a voltage of 110V.
#10
Which wiring system is most commonly used for residential lighting circuits?
Radial circuit
ExplanationRadial circuits are commonly used for residential lighting.
#11
What principle is used by a Residual Current Circuit Breaker (RCCB) to provide protection?
It detects imbalance between live and neutral wires
ExplanationRCCB safeguards by identifying imbalances between live and neutral wires.
#12
Which material is commonly used as the conductor in the majority of residential wiring?
Copper
ExplanationCopper is commonly used as the conductor in residential wiring.
#13
What is the principle of operation for a Magnetic Circuit Breaker?
Uses a magnetic field to trip the mechanism
ExplanationMagnetic Circuit Breakers trip the mechanism using a magnetic field.
#14
Which electrical component is used to connect different sections of a conduit system?
Junction box
ExplanationJunction boxes connect different sections of a conduit system.
#15
In a three-phase electrical system, what is the phase-to-phase voltage in the United States if the phase-to-neutral voltage is 120V?
208 V
ExplanationIn a three-phase system, the phase-to-phase voltage is 208V when the phase-to-neutral voltage is 120V.