#1
What is the primary purpose of the grounding in an electrical system?
To reduce the energy consumption
To provide a path for electric current to prevent electric shock
To increase the voltage
To make the system wireless
#2
Which device is used to protect a circuit from short-circuit and overloading?
Transformer
Resistor
Circuit breaker
Inductor
#3
Which type of cable is typically used for indoor electrical wiring?
Coaxial cable
Twisted pair cable
Non-metallic sheathed cable
Fiber optic cable
#4
What is the purpose of a GFCI (Ground Fault Circuit Interrupter)?
To prevent electrical fires
To increase electrical conductivity
To protect against electrical shock from ground faults
To convert AC to DC
#5
What is the maximum current for a typical 20-ampere circuit breaker?
#6
What does the term 'AWG' stand for in electrical wiring?
American Wire Gauge
Automated Wire Generation
Alternative Wiring Grid
Amplified Wireless Gauge
#7
In a residential wiring system, what color is typically used to denote the live wire?
#8
What does the term 'conduit' refer to in electrical installations?
A type of light fixture
A protective tube or trough for wires
A device that stores electrical energy
A tool for cutting wires
#9
What is the voltage of a standard residential electrical outlet in the United States?
#10
Which wiring system is most commonly used for residential lighting circuits?
Ring circuit
Radial circuit
Mesh circuit
Star circuit
#11
What principle is used by a Residual Current Circuit Breaker (RCCB) to provide protection?
It detects imbalance between live and neutral wires
It converts high voltage to low voltage
It provides grounding to excess current
It uses a fuse to break the circuit
#12
Which material is commonly used as the conductor in the majority of residential wiring?
#13
What is the principle of operation for a Magnetic Circuit Breaker?
Detects high temperature
Uses a magnetic field to trip the mechanism
Detects imbalance in electrical frequency
Converts excess current to heat
#14
Which electrical component is used to connect different sections of a conduit system?
Conduit box
Junction box
Outlet box
Switch box
#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?